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Label Element Value
PFI Prospectus | California Municipal Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading CALIFORNIA MUNICIPAL FUND
Objective [Heading] rr_ObjectiveHeading Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The Fund seeks to provide as high a level of current income that is exempt from federal and state personal income tax as is consistent with prudent investment management and preservation of capital.
Expense [Heading] rr_ExpenseHeading Fees and Expenses of the Fund
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock
This table describes the fees and expenses that you may pay if you buy, hold, and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $100,000 in Class A Shares of Principal Funds, Inc. More information about these and other discounts is available from your financial intermediary and in “Choosing a Share Class and The Costs of Investing” beginning on page 426 of the Fund’s Prospectus, Appendix B to the Prospectus titled “Intermediary-Specific Sales Charge Waivers and Reductions,” and “Multiple Class Structure” beginning on page 70 of the Fund’s Statement of Additional Information.

If you purchase Institutional Class shares through certain programs offered by certain financial intermediaries, you may be required to pay a commission and/or other forms of compensation to the broker, or to your Financial Professional or other financial intermediary.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder Fees (fees paid directly from your investment)
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination February 28, 2025
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock
The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in Annual Fund Operating Expenses or in the Example, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 31.5% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 31.50%
Expense Breakpoint Discounts [Text] rr_ExpenseBreakpointDiscounts You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $100,000 in Class A Shares of Principal Funds, Inc.
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 100,000
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example assumes conversion of the Class C shares to Class A shares after the eighth year. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. The calculation of costs takes into account any applicable contractual fee waivers and/or expense reimbursements for the period noted in the table above. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, No Redemption, By Year, Caption [Text] rr_ExpenseExampleNoRedemptionByYearCaption With respect to Class C shares, you would pay the following expenses if you did not redeem your shares (all other classes would be the same as in the above example):
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
Under normal circumstances, the Fund invests at least 80% of its net assets, plus any borrowings for investment purposes, in California municipal obligations (securities issued by or on behalf of state or local governments and other public authorities) at the time of purchase. Generally, these municipal obligations pay interest that is exempt from state personal income tax and federal income tax. These obligations may include bonds that generate interest payments that are subject to the federal individual alternative minimum tax. The Fund’s investment in municipal obligations include industrial revenue bonds. The Fund invests up to 20% of its assets in below-investment-grade bonds (sometimes called “high yield bonds” or “junk bonds”), which are rated at the time of purchase Ba1 or lower by Moody’s Investors Service, Inc. (“Moody’s”) and BB+ or lower by S&P Global Ratings (“S&P Global”). If the bond has been rated by only one of the rating agencies, that rating will determine the bond's rating; if the bond is rated differently by the rating agencies, the highest rating will be used; and if the bond has not been rated by either of the rating agencies, those selecting such investments will determine the bond's quality. The Fund also invests in inverse floating rate obligations (variable rate debt instruments that pay interest at rates that move in the opposite direction of prevailing interest rates), which are generally more volatile than other types of municipal obligations and may involve leverage.
Under normal circumstances, the Fund maintains an average portfolio duration that is within ±50% of the duration of the Bloomberg California Municipal Bond Index, which as of January 31, 2024 was 5.26 years. The Fund is not managed to a particular maturity.
Strategy Portfolio Concentration [Text] rr_StrategyPortfolioConcentration Under normal circumstances, the Fund invests at least 80% of its net assets, plus any borrowings for investment purposes, in California municipal obligations (securities issued by or on behalf of state or local governments and other public authorities) at the time of purchase.
Risk [Heading] rr_RiskHeading Principal Risks
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
The following information provides some indication of the risks of investing in the Fund. Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. You may get updated performance information at www.PrincipalAM.com.
The bar chart shows the investment returns of the Fund’s Class A shares for each full calendar year of operations for 10 years (or, if shorter, the life of the Fund). These annual returns do not reflect sales charges on Class A shares; if they did, results would be lower. The table shows for the last one, five, and ten calendar year periods (or, if shorter, the life of the Fund), how the Fund’s average annual total returns compare with those of one or more broad measures of market performance.
For periods prior to the inception date of Institutional Class shares (March 1, 2015), the performance shown in the table for Institutional Class shares is that of the Fund’s Class A shares, adjusted to reflect the fees and expenses of Institutional Class shares. However, where the adjustment for fees and expenses results in performance for Institutional Class shares that is higher than the historical performance of the Class A shares, the historical performance of Class A shares is used (without respect to sales charges, which are not applicable to Institutional Class shares). These adjustments result in performance for such periods that is no higher than the historical performance of the Class A shares.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following information provides some indication of the risks of investing in the Fund.
Performance Additional Market Index [Text] rr_PerformanceAdditionalMarketIndex The Bloomberg California Municipal Index is included as an additional index for the Fund as it shows how the Fund’s performance compares with the returns of an index of funds with similar investment objectives.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.PrincipalAM.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.
Bar Chart [Heading] rr_BarChartHeading Total Returns as of December 31
Bar Chart Does Not Reflect Sales Loads [Text] rr_BarChartDoesNotReflectSalesLoads These annual returns do not reflect sales charges on Class A shares; if they did, results would be lower.
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
Highest return for a quarter during the period of the bar chart above:
Q1 20145.67 %
Lowest return for a quarter during the period of the bar chart above:
Q1 2022(7.07)%
Performance Table Heading rr_PerformanceTableHeading Average Annual Total ReturnsFor the periods ended December 31, 2023
Performance Table Market Index Changed rr_PerformanceTableMarketIndexChanged Effective March 1, 2024, the Fund changed its primary broad-based index to the Bloomberg Municipal Bond Index in order to meet the revised definition of “broad-based securities market index.”
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown . After-tax returns are shown for Class A shares only and would be different for the other share classes.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock
After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. After-tax returns are shown for Class A shares only and would be different for the other share classes.
Effective March 1, 2024, the Fund changed its primary broad-based index to the Bloomberg Municipal Bond Index in order to meet the revised definition of “broad-based securities market index.” The Bloomberg California Municipal Index is included as an additional index for the Fund as it shows how the Fund’s performance compares with the returns of an index of funds with similar investment objectives.
PFI Prospectus | California Municipal Fund | Risk Lose Money [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Many factors affect that value, and it is possible to lose money by investing in the Fund.
PFI Prospectus | California Municipal Fund | Risk Not Insured Depository Institution [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
PFI Prospectus | California Municipal Fund | Counterparty Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Counterparty Risk. Counterparty risk is the risk that the counterparty to a contract or other obligation will be unable or unwilling to honor its obligations.
PFI Prospectus | California Municipal Fund | Fixed-Income Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Fixed-Income Securities Risk. Fixed-income securities are subject to interest rate, credit quality, and liquidity risks. The market value of fixed-income securities generally declines when interest rates rise, and increased interest rates may adversely affect the liquidity of certain fixed-income securities. Moreover, an issuer of fixed-income securities could default on its payment obligations due to increased interest rates or for other reasons.
PFI Prospectus | California Municipal Fund | Geographic Concentration Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Geographic Concentration Risk. A fund that invests significant portions of its assets in municipal obligations and bonds in particular geographic areas (a particular state, such as California, or a particular country or region) has greater exposure than other funds to economic conditions and developments in those areas.
PFI Prospectus | California Municipal Fund | High Yield Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock High Yield Securities Risk. High yield fixed-income securities (commonly referred to as “junk bonds”) are subject to greater credit quality risk than higher rated fixed-income securities and should be considered speculative.
PFI Prospectus | California Municipal Fund | Industrial Revenue Bond Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Industrial Revenue Bond Risk. The Fund will be sensitive to, and its performance will depend to a greater extent on, the overall condition and performance of industrial revenue bonds. These revenue bonds are issued by or on behalf of public authorities to obtain funds to finance various public and/or privately operated facilities, including those for business and manufacturing, housing, sports, pollution control, airport, mass transit, port, and parking facilities. These bonds are normally secured only by the revenues from the project and not by state or local government tax payments. Consequently, the credit quality of these bonds is dependent upon the ability of the user of the facilities financed by the bonds and any guarantor to meet its financial obligations.
PFI Prospectus | California Municipal Fund | Inverse Floating Rate Investments Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Inverse Floating Rate Investments Risk. Inverse floating rate investments are extremely sensitive to changes in interest rates and, in some cases, their market value may be extremely volatile.
PFI Prospectus | California Municipal Fund | Leverage Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Leverage Risk. Leverage created by borrowing or certain types of transactions or investments may impair the fund’s liquidity, cause it to liquidate positions at an unfavorable time, increase volatility of the fund’s net asset value, or diminish the fund’s performance.
PFI Prospectus | California Municipal Fund | Municipal Obligations Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Municipal Obligations Risk. Principal and interest payments on municipal securities may not be guaranteed by the issuing body and may be payable only from a particular source. That source may not perform as expected, and payment obligations may not be made or made on time.
PFI Prospectus | California Municipal Fund | Portfolio Duration Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Portfolio Duration Risk. Portfolio duration is a measure of the expected life of a fixed-income security and its sensitivity to changes in interest rates. The longer a fund’s average portfolio duration, the more sensitive the fund will be to changes in interest rates, which means funds with longer average portfolio durations may be more volatile than those with shorter durations.
PFI Prospectus | California Municipal Fund | Redemption And Large Transaction Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Redemption and Large Transaction Risk. Ownership of the Fund’s shares may be concentrated in one or a few large investors (such as funds of funds, institutional investors, and asset allocation programs) that may redeem or purchase shares in large quantities. These transactions may cause the Fund to sell securities to meet redemptions or to invest additional cash at times it would not otherwise do so, which may result in increased transaction costs, increased expenses, changes to expense ratios, and adverse effects to Fund performance. Such transactions may also accelerate the realization of taxable income if sales of portfolio securities result in gains. Moreover, reallocations by large shareholders among share classes of a fund may result in changes to the expense ratios of affected classes, which may increase the expenses paid by shareholders of the class that experienced the redemption.
PFI Prospectus | California Municipal Fund | Bloomberg U.S. Aggregate Bond Index (reflects no deduction for fees, expenses, or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
Label rr_AverageAnnualReturnLabel Bloomberg Municipal Bond Index (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 6.40%
5 Years rr_AverageAnnualReturnYear05 2.25%
10 Years rr_AverageAnnualReturnYear10 3.03%
PFI Prospectus | California Municipal Fund | Bloomberg California Municipal Index (reflects no deduction for fees, expenses, or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
Label rr_AverageAnnualReturnLabel Bloomberg California Municipal Index (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 6.22%
5 Years rr_AverageAnnualReturnYear05 2.25%
10 Years rr_AverageAnnualReturnYear10 3.10%
PFI Prospectus | California Municipal Fund | Class A  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol SRCMX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 3.75%
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.40%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Interest Expense (1) rr_Component1OtherExpensesOverAssets 0.17% [1]
Remainder of Other Expenses rr_Component2OtherExpensesOverAssets 0.07% [1]
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.24%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.89%
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.89%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 462
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 648
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 850
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,430
Annual Return 2014 rr_AnnualReturn2014 13.91%
Annual Return 2015 rr_AnnualReturn2015 4.42%
Annual Return 2016 rr_AnnualReturn2016 (0.19%)
Annual Return 2017 rr_AnnualReturn2017 6.88%
Annual Return 2018 rr_AnnualReturn2018 (0.20%)
Annual Return 2019 rr_AnnualReturn2019 8.33%
Annual Return 2020 rr_AnnualReturn2020 4.83%
Annual Return 2021 rr_AnnualReturn2021 1.98%
Annual Return 2022 rr_AnnualReturn2022 (10.70%)
Annual Return 2023 rr_AnnualReturn2023 5.55%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Highest return for a quarter during the period of the bar chart above:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Mar. 31, 2014
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 5.67%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Lowest return for a quarter during the period of the bar chart above:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2022
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (7.07%)
Label rr_AverageAnnualReturnLabel Class A Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 1.55%
5 Years rr_AverageAnnualReturnYear05 0.99%
10 Years rr_AverageAnnualReturnYear10 2.89%
PFI Prospectus | California Municipal Fund | Class A | After Taxes on Distributions  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Class A Return After Taxes on Distributions
1 Year rr_AverageAnnualReturnYear01 1.55%
5 Years rr_AverageAnnualReturnYear05 0.99%
10 Years rr_AverageAnnualReturnYear10 2.89%
PFI Prospectus | California Municipal Fund | Class A | After Taxes on Distributions and Sales  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Class A Return After Taxes on Distributions and Sale of Fund Shares
1 Year rr_AverageAnnualReturnYear01 2.05%
5 Years rr_AverageAnnualReturnYear05 1.33%
10 Years rr_AverageAnnualReturnYear10 2.95%
PFI Prospectus | California Municipal Fund | Class C  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol SRCCX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.40%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Interest Expense (1) rr_Component1OtherExpensesOverAssets 0.17% [1]
Remainder of Other Expenses rr_Component2OtherExpensesOverAssets 0.16% [1]
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.33%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.73%
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.73%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 276
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 545
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 939
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,818
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 176
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 545
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 939
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,818
Label rr_AverageAnnualReturnLabel Class C Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 3.75%
5 Years rr_AverageAnnualReturnYear05 0.95%
10 Years rr_AverageAnnualReturnYear10 2.58%
PFI Prospectus | California Municipal Fund | Institutional Class  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PCMFX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.40%
Interest Expense (1) rr_Component1OtherExpensesOverAssets 0.17% [1]
Remainder of Other Expenses rr_Component2OtherExpensesOverAssets 0.10% [1]
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.27%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.67%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.04%) [2]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.63%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 64
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 210
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 369
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 831
Label rr_AverageAnnualReturnLabel Institutional Class Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 5.81%
5 Years rr_AverageAnnualReturnYear05 2.03%
10 Years rr_AverageAnnualReturnYear10 3.52%
PFI Prospectus | Core Fixed Income Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading CORE FIXED INCOME FUND
Objective [Heading] rr_ObjectiveHeading Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The Fund seeks to provide a high level of current income consistent with preservation of capital.
Expense [Heading] rr_ExpenseHeading Fees and Expenses of the Fund
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock
This table describes the fees and expenses that you may pay if you buy, hold, and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $100,000 in Class A Shares of Principal Funds, Inc. More information about these and other discounts is available from your financial intermediary and in “Choosing a Share Class and The Costs of Investing” beginning on page 426 of the Fund’s Prospectus, Appendix B to the Prospectus titled “Intermediary-Specific Sales Charge Waivers and Reductions,” and “Multiple Class Structure” beginning on page 70 of the Fund’s Statement of Additional Information.
If you purchase Institutional Class or Class R-6 shares through certain programs offered by certain financial intermediaries, you may be required to pay a commission and/or other forms of compensation to the broker, or to your Financial Professional or other financial intermediary.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder Fees (fees paid directly from your investment)
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination February 28, 2025
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock
The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in Annual Fund Operating Expenses or in the Example, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 9.9% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 9.90%
Expense Breakpoint Discounts [Text] rr_ExpenseBreakpointDiscounts You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $100,000 in Class A Shares of Principal Funds, Inc.
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 100,000
Expenses Restated to Reflect Current [Text] rr_ExpensesRestatedToReflectCurrent Fees have been restated to reflect current fees.
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. The calculation of costs takes into account any applicable contractual fee waivers and/or expense reimbursements for the period noted in the table above. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, No Redemption, By Year, Caption [Text] rr_ExpenseExampleNoRedemptionByYearCaption With respect to Class J shares, you would pay the following expenses if you did not redeem your shares (all other classes would be the same as in the above example):
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
Under normal circumstances, the Fund invests at least 80% of its net assets, plus any borrowings for investment purposes, in fixed-income securities. The Fund invests primarily in a diversified pool of investment-grade fixed-income securities, including corporate securities, U.S. government securities, asset-backed securities and mortgage-backed securities (securitized products) (including collateralized mortgage obligations), and foreign securities. Investment grade securities are rated BBB- or higher by S&P Global Ratings (“S&P Global”) or Baa3 or higher by Moody’s Investors Service, Inc. (“Moody’s”), at the time of purchase. If the security has been rated by only one of the rating agencies, that rating will determine the security’s rating; if the security is rated differently by the rating agencies, the highest rating is used; and if the security has not been rated by either of the rating agencies, those selecting such investments will determine the security’s quality. The Fund is not managed to a particular maturity. Under normal circumstances, the Fund maintains an average portfolio duration that is within ±25% of the duration of the Bloomberg U.S. Aggregate Bond Index, which as of January 31, 2024 was 6.11 years.
Risk [Heading] rr_RiskHeading Principal Risks
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
The following information provides some indication of the risks of investing in the Fund. Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. You may get updated performance information at www.PrincipalAM.com.
The bar chart shows the investment returns of the Fund’s Class A shares for each full calendar year of operations for 10 years (or, if shorter, the life of the Fund). These annual returns do not reflect sales charges on Class A shares; if they did, results would be lower. The table shows for the last one, five, and ten calendar year periods (or, if shorter, the life of the Fund), how the Fund’s average annual total returns compare with those of one or more broad measures of market performance.
For periods prior to the inception date of Class R-6 shares (November 25, 2014), the performance shown in the table for Class R-6 shares is that of the Fund’s Class A shares, adjusted to reflect the fees and expenses of Class R-6 shares. However, where the adjustment for fees and expenses results in performance for Class R-6 shares that is higher than the historical performance of the Class A shares, the historical performance of the Class A shares is used (without respect to sales charges, which are not applicable to Class R-6 shares). These adjustments result in performance for such periods that is no higher than the historical performance of the Class A shares.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following information provides some indication of the risks of investing in the Fund.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.PrincipalAM.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.
Bar Chart [Heading] rr_BarChartHeading Total Returns as of December 31
Bar Chart Does Not Reflect Sales Loads [Text] rr_BarChartDoesNotReflectSalesLoads These annual returns do not reflect sales charges on Class A shares; if they did, results would be lower.
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
Highest return for a quarter during the period of the bar chart above:
Q4 20236.75 %
Lowest return for a quarter during the period of the bar chart above:
Q1 2022(5.80)%
Performance Table Heading rr_PerformanceTableHeading Average Annual Total ReturnsFor the periods ended December 31, 2023
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are shown for Class A shares only and would be different for the other share classes.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock
After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. After-tax returns are shown for Class A shares only and would be different for the other share classes.
PFI Prospectus | Core Fixed Income Fund | Risk Lose Money [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Many factors affect that value, and it is possible to lose money by investing in the Fund.
PFI Prospectus | Core Fixed Income Fund | Risk Not Insured Depository Institution [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
PFI Prospectus | Core Fixed Income Fund | Fixed-Income Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Fixed-Income Securities Risk. Fixed-income securities are subject to interest rate, credit quality, and liquidity risks. The market value of fixed-income securities generally declines when interest rates rise, and increased interest rates may adversely affect the liquidity of certain fixed-income securities. Moreover, an issuer of fixed-income securities could default on its payment obligations due to increased interest rates or for other reasons.
PFI Prospectus | Core Fixed Income Fund | Foreign Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Foreign Securities Risk. The risks of foreign securities include loss of value as a result of: political or economic instability; nationalization, expropriation, or confiscatory taxation; settlement delays; and limited government regulation (including less stringent reporting, accounting, and disclosure standards than are required of U.S. companies).
PFI Prospectus | Core Fixed Income Fund | Portfolio Duration Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Portfolio Duration Risk. Portfolio duration is a measure of the expected life of a fixed-income security and its sensitivity to changes in interest rates. The longer a fund’s average portfolio duration, the more sensitive the fund will be to changes in interest rates, which means funds with longer average portfolio durations may be more volatile than those with shorter durations.
PFI Prospectus | Core Fixed Income Fund | Real Estate Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Real Estate Securities Risk. Investing in real estate securities subjects the fund to the risks associated with the real estate market (which are similar to the risks associated with direct ownership in real estate), including declines in real estate values, loss due to casualty or condemnation, property taxes, interest rate changes, increased expenses, cash flow of underlying real estate assets, regulatory changes (including zoning, land use, and rents), and environmental problems, as well as to the risks related to the management skill and creditworthiness of the issuer.
PFI Prospectus | Core Fixed Income Fund | Redemption And Large Transaction Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Redemption and Large Transaction Risk. Ownership of the Fund’s shares may be concentrated in one or a few large investors (such as funds of funds, institutional investors, and asset allocation programs) that may redeem or purchase shares in large quantities. These transactions may cause the Fund to sell securities to meet redemptions or to invest additional cash at times it would not otherwise do so, which may result in increased transaction costs, increased expenses, changes to expense ratios, and adverse effects to Fund performance. Such transactions may also accelerate the realization of taxable income if sales of portfolio securities result in gains. Moreover, reallocations by large shareholders among share classes of a fund may result in changes to the expense ratios of affected classes, which may increase the expenses paid by shareholders of the class that experienced the redemption.
PFI Prospectus | Core Fixed Income Fund | Securitized Products Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Securitized Products Risk. Investments in securitized products are subject to risks similar to traditional fixed-income securities, such as credit, interest rate, liquidity, prepayment, extension, and default risk, as well as additional risks associated with the nature of the assets and the servicing of those assets. Unscheduled prepayments on securitized products may have to be reinvested at lower rates. A reduction in prepayments may increase the effective maturities of these securities, exposing them to the risk of decline in market value over time (extension risk).
PFI Prospectus | Core Fixed Income Fund | U.S. Government Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock U.S. Government Securities Risk. Yields available from U.S. government securities are generally lower than yields from many other fixed-income securities. The value of U.S. government securities may be adversely impacted by changes in interest rates, changes in the credit rating of the U.S. government, or a default by the U.S. government.
PFI Prospectus | Core Fixed Income Fund | U.S. Government-Sponsored Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock U.S. Government-Sponsored Securities Risk. Securities issued by U.S. government-sponsored enterprises such as the Federal Home Loan Mortgage Corporation, the Federal National Mortgage Association, and the Federal Home Loan Banks are not issued or guaranteed by the U.S. government.
PFI Prospectus | Core Fixed Income Fund | Bloomberg U.S. Aggregate Bond Index (reflects no deduction for fees, expenses, or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
Label rr_AverageAnnualReturnLabel Bloomberg U.S. Aggregate Bond Index (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 5.53%
5 Years rr_AverageAnnualReturnYear05 1.10%
10 Years rr_AverageAnnualReturnYear10 1.81%
PFI Prospectus | Core Fixed Income Fund | Class A  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol CMPIX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 2.25%
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.33% [3]
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.17%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.76%
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.76%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 301
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 462
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 638
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,146
Annual Return 2014 rr_AnnualReturn2014 4.97%
Annual Return 2015 rr_AnnualReturn2015 (1.34%)
Annual Return 2016 rr_AnnualReturn2016 5.08%
Annual Return 2017 rr_AnnualReturn2017 4.15%
Annual Return 2018 rr_AnnualReturn2018 (0.25%)
Annual Return 2019 rr_AnnualReturn2019 8.62%
Annual Return 2020 rr_AnnualReturn2020 7.84%
Annual Return 2021 rr_AnnualReturn2021 (2.03%)
Annual Return 2022 rr_AnnualReturn2022 (13.01%)
Annual Return 2023 rr_AnnualReturn2023 5.42%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Highest return for a quarter during the period of the bar chart above:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Dec. 31, 2023
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 6.75%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Lowest return for a quarter during the period of the bar chart above:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2022
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (5.80%)
Label rr_AverageAnnualReturnLabel Class A Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 3.09%
5 Years rr_AverageAnnualReturnYear05 0.57%
10 Years rr_AverageAnnualReturnYear10 1.52%
PFI Prospectus | Core Fixed Income Fund | Class A | After Taxes on Distributions  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Class A Return After Taxes on Distributions
1 Year rr_AverageAnnualReturnYear01 1.87%
5 Years rr_AverageAnnualReturnYear05 (0.42%)
10 Years rr_AverageAnnualReturnYear10 0.35%
PFI Prospectus | Core Fixed Income Fund | Class A | After Taxes on Distributions and Sales  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Class A Return After Taxes on Distributions and Sale of Fund Shares
1 Year rr_AverageAnnualReturnYear01 1.81%
5 Years rr_AverageAnnualReturnYear05 0.04%
10 Years rr_AverageAnnualReturnYear10 0.66%
PFI Prospectus | Core Fixed Income Fund | Class J  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PIOJX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.33% [3]
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.15%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.15%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.64%
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.64%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 165
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 205
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 357
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 798
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 65
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 205
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 357
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 798
Label rr_AverageAnnualReturnLabel Class J Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 4.56%
5 Years rr_AverageAnnualReturnYear05 1.16%
10 Years rr_AverageAnnualReturnYear10 1.86%
PFI Prospectus | Core Fixed Income Fund | Institutional Class  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PIOIX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.33% [3]
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.15%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.49%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.05%) [4]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.44%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 45
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 152
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 269
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 611
Label rr_AverageAnnualReturnLabel Institutional Class Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 5.87%
5 Years rr_AverageAnnualReturnYear05 1.33%
10 Years rr_AverageAnnualReturnYear10 2.08%
PFI Prospectus | Core Fixed Income Fund | Class R-1  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PIOMX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.33% [3]
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.35%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.54%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.23%
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.23%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 125
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 390
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 676
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,489
Label rr_AverageAnnualReturnLabel Class R-1 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 4.91%
5 Years rr_AverageAnnualReturnYear05 0.53%
10 Years rr_AverageAnnualReturnYear10 1.26%
PFI Prospectus | Core Fixed Income Fund | Class R-3  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PIOOX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.33% [3]
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.33%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.92%
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.92%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 94
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 293
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 509
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,131
Label rr_AverageAnnualReturnLabel Class R-3 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 5.35%
5 Years rr_AverageAnnualReturnYear05 0.86%
10 Years rr_AverageAnnualReturnYear10 1.57%
PFI Prospectus | Core Fixed Income Fund | Class R-4  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PIOPX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.33% [3]
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.10%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.29%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.73%
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.73%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 75
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 233
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 406
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 906
Label rr_AverageAnnualReturnLabel Class R-4 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 5.55%
5 Years rr_AverageAnnualReturnYear05 1.05%
10 Years rr_AverageAnnualReturnYear10 1.77%
PFI Prospectus | Core Fixed Income Fund | Class R-5  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PIOQX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.33% [3]
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.27%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.61%
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.61%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 62
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 195
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 340
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 762
Label rr_AverageAnnualReturnLabel Class R-5 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 5.57%
5 Years rr_AverageAnnualReturnYear05 1.15%
10 Years rr_AverageAnnualReturnYear10 1.88%
PFI Prospectus | Core Fixed Income Fund | Class R-6  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PICNX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.33% [3]
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.01%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.35%
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.35%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 36
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 113
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 197
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 443
Label rr_AverageAnnualReturnLabel Class R-6 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 5.84%
5 Years rr_AverageAnnualReturnYear05 1.41%
10 Years rr_AverageAnnualReturnYear10 2.10%
PFI Prospectus | Core Plus Bond Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading CORE PLUS BOND FUND
Objective [Heading] rr_ObjectiveHeading Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The Fund seeks to provide current income
Objective, Secondary [Text Block] rr_ObjectiveSecondaryTextBlock and, as a secondary objective, capital appreciation.
Expense [Heading] rr_ExpenseHeading Fees and Expenses of the Fund
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock
This table describes the fees and expenses that you may pay if you buy, hold, and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $100,000 in Class A Shares of Principal Funds, Inc. More information about these and other discounts is available from your financial intermediary and in “Choosing a Share Class and The Costs of Investing” beginning on page 426 of the Fund’s Prospectus, Appendix B to the Prospectus titled “Intermediary-Specific Sales Charge Waivers and Reductions,” and “Multiple Class Structure” beginning on page 70 of the Fund’s Statement of Additional Information.
If you purchase Institutional Class shares through certain programs offered by certain financial intermediaries, you may be required to pay a commission and/or other forms of compensation to the broker, or to your Financial Professional or other financial intermediary.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder Fees (fees paid directly from your investment)
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination February 28, 2025
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock
The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in Annual Fund Operating Expenses or in the Example, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 156.0% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 156.00%
Expense Breakpoint Discounts [Text] rr_ExpenseBreakpointDiscounts You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $100,000 in Class A Shares of Principal Funds, Inc.
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 100,000
Expenses Restated to Reflect Current [Text] rr_ExpensesRestatedToReflectCurrent Fees have been restated to reflect current fees.
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. The calculation of costs takes into account any applicable contractual fee waivers and/or expense reimbursements for the period noted in the table above. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, No Redemption, By Year, Caption [Text] rr_ExpenseExampleNoRedemptionByYearCaption With respect to Class J shares, you would pay the following expenses if you did not redeem your shares (all other classes would be the same as in the above example):
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
Under normal circumstances, the Fund invests at least 80% of its net assets, plus any borrowings for investment purposes, in bonds or other debt securities at the time of purchase. Such investments include securities issued or guaranteed by the U.S. government or its agencies or instrumentalities; asset-backed securities and mortgage-backed securities (securitized products, including collateralized mortgage obligations); corporate bonds; and foreign securities, including emerging market securities. The Fund invests in investment-grade securities and, with respect to up to 25% of its assets, in below-investment-grade securities (sometimes called “high yield” or “junk”), which are rated at the time of purchase Ba1 or lower by Moody’s Investors Service, Inc. (“Moody’s”) and BB+ or lower by S&P Global Ratings (“S&P Global”). If the security has been rated by only one of the rating agencies, that rating will determine the security’s rating; if the security is rated differently by the rating agencies, the highest rating will be used; and if the security has not been rated by either of the rating agencies, those selecting such investments will determine the security’s quality. The Fund is not managed to a particular maturity. Under normal circumstances, the Fund maintains an average portfolio duration that is within ±25% of the duration of the Bloomberg U.S. Aggregate Bond Index, which as of January 31, 2024 was 6.11 years. The Fund’s strategies may result in the active and frequent trading of the Fund’s portfolio securities.
The Fund enters into dollar roll transactions, which may involve leverage. The Fund invests in derivatives, including Treasury futures and interest rate swaps to manage the fixed-income exposure (including for hedging purposes) and credit default swaps to increase or decrease, in an efficient manner, exposures to certain sectors or individual issuers. A derivative is a financial arrangement, the value of which is derived from, or based on, a traditional security, asset, or market index.
Strategy Portfolio Concentration [Text] rr_StrategyPortfolioConcentration Under normal circumstances, the Fund maintains an average portfolio duration that is within ±25% of the duration of the Bloomberg U.S. Aggregate Bond Index, which as of January 31, 2024 was 6.11 years. The Fund’s strategies may result in the active and frequent trading of the Fund’s portfolio securities.
Risk [Heading] rr_RiskHeading Principal Risks
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
The following information provides some indication of the risks of investing in the Fund. Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. You may get updated performance information at www.PrincipalAM.com.
The bar chart shows the investment returns of the Fund’s Class A shares for each full calendar year of operations for 10 years (or, if shorter, the life of the Fund). These annual returns do not reflect sales charges on Class A shares; if they did, results would be lower. The table shows for the last one, five, and ten calendar year periods (or, if shorter, the life of the Fund), how the Fund’s average annual total returns compare with those of one or more broad measures of market performance.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following information provides some indication of the risks of investing in the Fund.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.PrincipalAM.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.
Bar Chart [Heading] rr_BarChartHeading Total Returns as of December 31
Bar Chart Does Not Reflect Sales Loads [Text] rr_BarChartDoesNotReflectSalesLoads These annual returns do not reflect sales charges on Class A shares; if they did, results would be lower.
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
Highest return for a quarter during the period of the bar chart above:
Q4 20237.36 %
Lowest return for a quarter during the period of the bar chart above:
Q2 2022(6.07)%
Performance Table Heading rr_PerformanceTableHeading Average Annual Total ReturnsFor the periods ended December 31, 2023
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are shown for Class A shares only and would be different for the other share classes.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock
After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. After-tax returns are shown for Class A shares only and would be different for the other share classes.
PFI Prospectus | Core Plus Bond Fund | Risk Lose Money [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Many factors affect that value, and it is possible to lose money by investing in the Fund.
PFI Prospectus | Core Plus Bond Fund | Risk Not Insured Depository Institution [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
PFI Prospectus | Core Plus Bond Fund | Counterparty Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Counterparty Risk. Counterparty risk is the risk that the counterparty to a contract or other obligation will be unable or unwilling to honor its obligations.
PFI Prospectus | Core Plus Bond Fund | Derivatives Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Derivatives Risk. Derivatives may not move in the direction anticipated by the portfolio manager. Transactions in derivatives may increase volatility, cause the liquidation of portfolio positions when not advantageous to do so, and result in disproportionate losses that may be substantially greater than a fund’s initial investment.
•Credit Default Swaps. Credit default swaps involve special risks in addition to those associated with swaps generally because they are difficult to value, are highly susceptible to liquidity and credit risk, and generally pay a return to the party that has paid the premium only in the event of an actual default by the issuer of the underlying obligation (as opposed to a credit downgrade or other indication of financial difficulty). The protection “buyer” in a credit default contract may be obligated to pay the protection “seller” an up-front payment or a periodic stream of payments over the term of the contract, provided, generally, that no credit event on a reference obligation has occurred. If a credit event occurs, the seller generally must pay the buyer the “par value” (i.e., full notional value) of the swap in exchange for an equal face amount of deliverable obligations of the reference entity described in the swap, or the seller may be required to deliver the related net cash amount, if the swap is cash settled. The Fund may be either the buyer or seller in the transaction.
•Futures and Swaps. These derivative instruments involve specific risks, including: the imperfect correlation between the change in market value of the instruments held by the fund and the price of the instruments; possible lack of a liquid secondary market for an instrument and the resulting inability to close it when desired; counterparty risk; and if the fund has insufficient cash, it may have to sell securities from its portfolio to meet any applicable daily variation margin requirements.
PFI Prospectus | Core Plus Bond Fund | Derivatives Risk, Credit Default Swaps Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Credit Default Swaps. Credit default swaps involve special risks in addition to those associated with swaps generally because they are difficult to value, are highly susceptible to liquidity and credit risk, and generally pay a return to the party that has paid the premium only in the event of an actual default by the issuer of the underlying obligation (as opposed to a credit downgrade or other indication of financial difficulty). The protection “buyer” in a credit default contract may be obligated to pay the protection “seller” an up-front payment or a periodic stream of payments over the term of the contract, provided, generally, that no credit event on a reference obligation has occurred. If a credit event occurs, the seller generally must pay the buyer the “par value” (i.e., full notional value) of the swap in exchange for an equal face amount of deliverable obligations of the reference entity described in the swap, or the seller may be required to deliver the related net cash amount, if the swap is cash settled. The Fund may be either the buyer or seller in the transaction.
PFI Prospectus | Core Plus Bond Fund | Derivatives Risk, Futures And Swaps Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Futures and Swaps. These derivative instruments involve specific risks, including: the imperfect correlation between the change in market value of the instruments held by the fund and the price of the instruments; possible lack of a liquid secondary market for an instrument and the resulting inability to close it when desired; counterparty risk; and if the fund has insufficient cash, it may have to sell securities from its portfolio to meet any applicable daily variation margin requirements.
PFI Prospectus | Core Plus Bond Fund | Emerging Markets Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Emerging Markets Risk. Investments in emerging markets may have more risk than those in developed markets because the emerging markets are less developed and more illiquid. Emerging markets can also be subject to increased social, economic, regulatory, and political uncertainties and can be extremely volatile. The U.S. Securities and Exchange Commission, the U.S. Department of Justice, and other U.S. authorities may be limited in their ability to pursue bad actors in emerging markets, including with respect to fraud.
PFI Prospectus | Core Plus Bond Fund | Fixed-Income Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Fixed-Income Securities Risk. Fixed-income securities are subject to interest rate, credit quality, and liquidity risks. The market value of fixed-income securities generally declines when interest rates rise, and increased interest rates may adversely affect the liquidity of certain fixed-income securities. Moreover, an issuer of fixed-income securities could default on its payment obligations due to increased interest rates or for other reasons.
PFI Prospectus | Core Plus Bond Fund | Foreign Currency Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Foreign Currency Risk. Risks of investing in securities denominated in, or that trade in, foreign (non-U.S.) currencies include changes in foreign exchange rates and foreign exchange restrictions.
PFI Prospectus | Core Plus Bond Fund | Foreign Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Foreign Securities Risk. The risks of foreign securities include loss of value as a result of: political or economic instability; nationalization, expropriation, or confiscatory taxation; settlement delays; and limited government regulation (including less stringent reporting, accounting, and disclosure standards than are required of U.S. companies).
PFI Prospectus | Core Plus Bond Fund | Hedging Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Hedging Risk. A fund that implements a hedging strategy using derivatives and/or securities could expose the fund to the risk that can arise when a change in the value of a hedge does not match a change in the value of the asset it hedges. In other words, the change in value of the hedge could move in a direction that does not match the change in value of the underlying asset, resulting in a risk of loss to the fund.
PFI Prospectus | Core Plus Bond Fund | High Portfolio Turnover Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock High Portfolio Turnover Risk. High portfolio turnover (more than 100%) caused by active and frequent trading of portfolio securities may result in accelerating the realization of taxable gains and losses, lower fund performance, and increased brokerage costs.
PFI Prospectus | Core Plus Bond Fund | High Yield Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock High Yield Securities Risk. High yield fixed-income securities (commonly referred to as “junk bonds”) are subject to greater credit quality risk than higher rated fixed-income securities and should be considered speculative.
PFI Prospectus | Core Plus Bond Fund | Leverage Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Leverage Risk. Leverage created by borrowing or certain types of transactions or investments may impair the fund’s liquidity, cause it to liquidate positions at an unfavorable time, increase volatility of the fund’s net asset value, or diminish the fund’s performance.
PFI Prospectus | Core Plus Bond Fund | Portfolio Duration Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Portfolio Duration Risk. Portfolio duration is a measure of the expected life of a fixed-income security and its sensitivity to changes in interest rates. The longer a fund’s average portfolio duration, the more sensitive the fund will be to changes in interest rates, which means funds with longer average portfolio durations may be more volatile than those with shorter durations.
PFI Prospectus | Core Plus Bond Fund | Real Estate Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Real Estate Securities Risk. Investing in real estate securities subjects the fund to the risks associated with the real estate market (which are similar to the risks associated with direct ownership in real estate), including declines in real estate values, loss due to casualty or condemnation, property taxes, interest rate changes, increased expenses, cash flow of underlying real estate assets, regulatory changes (including zoning, land use, and rents), and environmental problems, as well as to the risks related to the management skill and creditworthiness of the issuer.
PFI Prospectus | Core Plus Bond Fund | Redemption And Large Transaction Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Redemption and Large Transaction Risk. Ownership of the Fund’s shares may be concentrated in one or a few large investors (such as funds of funds, institutional investors, and asset allocation programs) that may redeem or purchase shares in large quantities. These transactions may cause the Fund to sell securities to meet redemptions or to invest additional cash at times it would not otherwise do so, which may result in increased transaction costs, increased expenses, changes to expense ratios, and adverse effects to Fund performance. Such transactions may also accelerate the realization of taxable income if sales of portfolio securities result in gains. Moreover, reallocations by large shareholders among share classes of a fund may result in changes to the expense ratios of affected classes, which may increase the expenses paid by shareholders of the class that experienced the redemption.
PFI Prospectus | Core Plus Bond Fund | Securitized Products Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Securitized Products Risk. Investments in securitized products are subject to risks similar to traditional fixed-income securities, such as credit, interest rate, liquidity, prepayment, extension, and default risk, as well as additional risks associated with the nature of the assets and the servicing of those assets. Unscheduled prepayments on securitized products may have to be reinvested at lower rates. A reduction in prepayments may increase the effective maturities of these securities, exposing them to the risk of decline in market value over time (extension risk).
PFI Prospectus | Core Plus Bond Fund | U.S. Government Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock U.S. Government Securities Risk. Yields available from U.S. government securities are generally lower than yields from many other fixed-income securities. The value of U.S. government securities may be adversely impacted by changes in interest rates, changes in the credit rating of the U.S. government, or a default by the U.S. government.
PFI Prospectus | Core Plus Bond Fund | U.S. Government-Sponsored Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock U.S. Government-Sponsored Securities Risk. Securities issued by U.S. government-sponsored enterprises such as the Federal Home Loan Mortgage Corporation, the Federal National Mortgage Association, and the Federal Home Loan Banks are not issued or guaranteed by the U.S. government.
PFI Prospectus | Core Plus Bond Fund | Bloomberg U.S. Aggregate Bond Index (reflects no deduction for fees, expenses, or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
Label rr_AverageAnnualReturnLabel Bloomberg U.S. Aggregate Bond Index (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 5.53%
5 Years rr_AverageAnnualReturnYear05 1.10%
10 Years rr_AverageAnnualReturnYear10 1.81%
PFI Prospectus | Core Plus Bond Fund | Class A  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PRBDX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 3.75%
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.42% [5]
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.32%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.99%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.19%)
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.80%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 454
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 660
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 884
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,526
Annual Return 2014 rr_AnnualReturn2014 4.69%
Annual Return 2015 rr_AnnualReturn2015 (0.67%)
Annual Return 2016 rr_AnnualReturn2016 3.59%
Annual Return 2017 rr_AnnualReturn2017 4.48%
Annual Return 2018 rr_AnnualReturn2018 (2.09%)
Annual Return 2019 rr_AnnualReturn2019 9.44%
Annual Return 2020 rr_AnnualReturn2020 9.22%
Annual Return 2021 rr_AnnualReturn2021 (0.92%)
Annual Return 2022 rr_AnnualReturn2022 (14.39%)
Annual Return 2023 rr_AnnualReturn2023 5.10%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Highest return for a quarter during the period of the bar chart above:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Dec. 31, 2023
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 7.36%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Lowest return for a quarter during the period of the bar chart above:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Jun. 30, 2022
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (6.07%)
Label rr_AverageAnnualReturnLabel Class A Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 1.19%
5 Years rr_AverageAnnualReturnYear05 0.50%
10 Years rr_AverageAnnualReturnYear10 1.23%
PFI Prospectus | Core Plus Bond Fund | Class A | After Taxes on Distributions  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Class A Return After Taxes on Distributions
1 Year rr_AverageAnnualReturnYear01 (0.03%)
5 Years rr_AverageAnnualReturnYear05 (0.93%)
10 Years rr_AverageAnnualReturnYear10 (0.02%)
PFI Prospectus | Core Plus Bond Fund | Class A | After Taxes on Distributions and Sales  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Class A Return After Taxes on Distributions and Sale of Fund Shares
1 Year rr_AverageAnnualReturnYear01 0.69%
5 Years rr_AverageAnnualReturnYear05 (0.15%)
10 Years rr_AverageAnnualReturnYear10 0.44%
PFI Prospectus | Core Plus Bond Fund | Class J  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PBMJX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.42% [5]
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.15%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.32%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.89%
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.89%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 191
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 284
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 493
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,096
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 91
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 284
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 493
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,096
Label rr_AverageAnnualReturnLabel Class J Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 4.07%
5 Years rr_AverageAnnualReturnYear05 1.27%
10 Years rr_AverageAnnualReturnYear10 1.63%
PFI Prospectus | Core Plus Bond Fund | Institutional Class  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PMSIX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.42% [5]
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.17%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.59%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.11%)
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.48%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 49
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 178
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 318
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 727
Label rr_AverageAnnualReturnLabel Institutional Class Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 5.40%
5 Years rr_AverageAnnualReturnYear05 1.59%
10 Years rr_AverageAnnualReturnYear10 1.97%
PFI Prospectus | Core Plus Bond Fund | Class R-1  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PBOMX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.42% [5]
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.35%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.54%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.31%
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.31%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 133
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 415
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 718
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,579
Label rr_AverageAnnualReturnLabel Class R-1 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 4.55%
5 Years rr_AverageAnnualReturnYear05 0.76%
10 Years rr_AverageAnnualReturnYear10 1.11%
PFI Prospectus | Core Plus Bond Fund | Class R-3  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PBMMX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.42% [5]
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.33%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.00%
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.00%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 102
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 318
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 552
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,225
Label rr_AverageAnnualReturnLabel Class R-3 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 4.80%
5 Years rr_AverageAnnualReturnYear05 1.06%
10 Years rr_AverageAnnualReturnYear10 1.43%
PFI Prospectus | Core Plus Bond Fund | Class R-4  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PBMSX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.42% [5]
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.10%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.29%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.81%
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.81%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 83
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 259
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 450
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,002
Label rr_AverageAnnualReturnLabel Class R-4 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 5.08%
5 Years rr_AverageAnnualReturnYear05 1.26%
10 Years rr_AverageAnnualReturnYear10 1.62%
PFI Prospectus | Core Plus Bond Fund | Class R-5  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PBMPX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.42% [5]
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.27%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.69%
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.69%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 70
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 221
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 384
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 859
Label rr_AverageAnnualReturnLabel Class R-5 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 5.22%
5 Years rr_AverageAnnualReturnYear05 1.39%
10 Years rr_AverageAnnualReturnYear10 1.75%
PFI Prospectus | Diversified Income Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading DIVERSIFIED INCOME FUND
Objective [Heading] rr_ObjectiveHeading Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock
The Fund seeks income.
Expense [Heading] rr_ExpenseHeading Fees and Expenses of the Fund
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock
This table describes the fees and expenses that you may pay if you buy, hold, and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $100,000 in Class A Shares of Principal Funds, Inc. More information about these and other discounts is available from your financial intermediary and in “Choosing a Share Class and The Costs of Investing” beginning on page 426 of the Fund’s Prospectus, Appendix B to the Prospectus titled “Intermediary-Specific Sales Charge Waivers and Reductions,” and “Multiple Class Structure” beginning on page 70 of the Fund’s Statement of Additional Information.
If you purchase Institutional Class or Class R-6 shares through certain programs offered by certain financial intermediaries, you may be required to pay a commission and/or other forms of compensation to the broker, or to your Financial Professional or other financial intermediary.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder Fees (fees paid directly from your investment)
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination February 28, 2025
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock
The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in Annual Fund Operating Expenses or in the Example, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 75.1% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 75.10%
Expense Breakpoint Discounts [Text] rr_ExpenseBreakpointDiscounts You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $100,000 in Class A Shares of Principal Funds, Inc.
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 100,000
Expenses Restated to Reflect Current [Text] rr_ExpensesRestatedToReflectCurrent Fees have been restated to reflect current fees.
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example assumes conversion of the Class C shares to Class A shares after the eighth year. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. The calculation of costs takes into account any applicable contractual fee waivers and/or expense reimbursements for the period noted in the table above. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, No Redemption, By Year, Caption [Text] rr_ExpenseExampleNoRedemptionByYearCaption With respect to Class C shares, you would pay the following expenses if you did not redeem your shares (all other classes would be the same as in the above example):
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
The Fund generally invests a majority of its assets in fixed-income securities, such as investment-grade corporate bonds, high yield bonds (also known as “junk” bonds), preferred securities, securitized products, and emerging market debt securities, in an effort to provide incremental yields over a portfolio of government securities. Such securities include instruments with variable or floating interest rates. The fixed-income portion of the Fund is not managed to a particular maturity or duration. The Fund invests in foreign, including emerging market, securities. The Fund uses derivative strategies. A derivative is a financial arrangement, the value of which is derived from, or based on, a traditional security, asset, or market index.
In managing the Fund, Principal Global Investors, LLC (“PGI”), the Fund’s investment advisor, determines the Fund's strategic asset allocation among actively managed and passively managed (index) strategies that are executed by PGI and multiple sub-advisors. PGI has considerable latitude in allocating the Fund's assets among the general investment categories listed below. The Fund uses strategies and sub-advisors to varying degrees and may change allocations, add new or eliminate existing strategies and sub-advisors, and temporarily or permanently reduce allocations from time to time such that the Fund would have little or no assets allocated to a particular strategy or sub-advisor.
•Investment-grade corporate securities, which are rated at the time of purchase Baa3 or higher by Moody’s Investors Service (“Moody’s”) or BBB- or higher by S&P Global Ratings (“S&P Global”).
•High yield and other income-producing securities, including bank loans and corporate bonds. “High yield” securities are below investment grade securities (sometimes called “junk”), which are rated at the time of purchase Ba1 or lower by Moody's and BB+ or lower by S&P Global. These securities offer a higher yield than other, higher rated securities, but they carry a greater degree of risk and are considered speculative with respect to the issuer's ability to pay interest and to repay principal. This portion of the Fund also invests in currency forwards and currency options to hedge currency risk.
•Preferred securities, focusing primarily on the financial services and utility industries.
•Diversified portfolio of fixed-income securities, including those issued by governments and their agencies and corporate entities in emerging markets. This portion of the Fund also invests in interest rate swaps or Treasury futures to manage fixed-income exposure; credit default swaps to increase or decrease in an efficient manner exposures to certain sectors or individual issuers; total return swaps to increase or decrease in an efficient manner exposures to certain sectors; and currency forwards and currency options to hedge currency risk and express views on the direction of currency.
•Securitized products such as asset-backed securities and mortgage-backed securities, including commercial mortgage-backed securities, which are bonds secured by first mortgages on commercial real estate.
Risk [Heading] rr_RiskHeading Principal Risks
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
The following information provides some indication of the risks of investing in the Fund. Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. You may get updated performance information at www.PrincipalAM.com.
The bar chart shows the investment returns of the Fund’s Class A shares for each full calendar year of operations for 10 years (or, if shorter, the life of the Fund). These annual returns do not reflect sales charges on Class A shares; if they did, results would be lower. The table shows for the last one, five, and ten calendar year periods (or, if shorter, the life of the Fund), how the Fund’s average annual total returns compare with those of one or more broad measures of market performance.
For periods prior to the inception date of Class R-6 shares (June 12, 2017), the performance shown in the table for Class R-6 shares is that of the Fund’s Institutional Class shares, adjusted to reflect the fees and expenses of Class R-6 shares. These adjustments result in performance for such periods that is no higher than the historical performance of the Institutional Class shares.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following information provides some indication of the risks of investing in the Fund.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.PrincipalAM.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.
Bar Chart [Heading] rr_BarChartHeading Total Returns as of December 31
Bar Chart Does Not Reflect Sales Loads [Text] rr_BarChartDoesNotReflectSalesLoads These annual returns do not reflect sales charges on Class A shares; if they did, results would be lower.
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
Highest return for a quarter during the period of the bar chart above:
Q4 20208.39 %
Lowest return for a quarter during the period of the bar chart above:
Q1 2020(17.02)%
Performance Table Heading rr_PerformanceTableHeading Average Annual Total ReturnsFor the periods ended December 31, 2023
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are shown for Class A shares only and would be different for the other share classes.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock
After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. After-tax returns are shown for Class A shares only and would be different for the other share classes.
PFI Prospectus | Diversified Income Fund | Risk Lose Money [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Many factors affect that value, and it is possible to lose money by investing in the Fund.
PFI Prospectus | Diversified Income Fund | Risk Not Insured Depository Institution [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
PFI Prospectus | Diversified Income Fund | Asset Allocation Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Asset Allocation Risk. A fund’s selection and weighting of asset classes and allocation among sub-advisors may cause it to underperform other funds with a similar investment objective.
PFI Prospectus | Diversified Income Fund | Bank Loans Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Bank Loans Risk. Changes in economic conditions are likely to cause issuers of bank loans (also known as senior floating rate interests) to be unable to meet their obligations. In addition, the value of the collateral securing the loan (if any) may decline, causing a loan to be substantially unsecured. Underlying credit agreements governing the bank loans, reliance on market makers, priority of repayment, and overall market volatility may harm the liquidity of loans.
PFI Prospectus | Diversified Income Fund | Counterparty Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Counterparty Risk. Counterparty risk is the risk that the counterparty to a contract or other obligation will be unable or unwilling to honor its obligations.
PFI Prospectus | Diversified Income Fund | Derivatives Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Derivatives Risk. Derivatives may not move in the direction anticipated by the portfolio manager. Transactions in derivatives may increase volatility, cause the liquidation of portfolio positions when not advantageous to do so, and result in disproportionate losses that may be substantially greater than a fund’s initial investment.
•Credit Default Swaps. Credit default swaps involve special risks in addition to those associated with swaps generally because they are difficult to value, are highly susceptible to liquidity and credit risk, and generally pay a return to the party that has paid the premium only in the event of an actual default by the issuer of the underlying obligation (as opposed to a credit downgrade or other indication of financial difficulty). The protection “buyer” in a credit default contract may be obligated to pay the protection “seller” an up-front payment or a periodic stream of payments over the term of the contract, provided, generally, that no credit event on a reference obligation has occurred. If a credit event occurs, the seller generally must pay the buyer the “par value” (i.e., full notional value) of the swap in exchange for an equal face amount of deliverable obligations of the reference entity described in the swap, or the seller may be required to deliver the related net cash amount, if the swap is cash settled. The Fund may be either the buyer or seller in the transaction.
•Currency Contracts. Derivatives related to currency contracts involve the specific risk of government action through exchange controls that would restrict the ability of the fund to deliver or receive currency.
•Forward Contracts, Futures, and Swaps. Forward contracts, futures, and swaps involve specific risks, including: the imperfect correlation between the change in market value of the instruments held by the fund and the price of the forward contract, future, or swap; possible lack of a liquid secondary market for a forward contract, future, or swap and the resulting inability to close a forward contract, future, or swap when desired; counterparty risk; and if the fund has insufficient cash, it may have to sell securities from its portfolio to meet daily variation margin requirements.
•Options. Options involve specific risks, including: the imperfect correlation between the change in market value of the instruments held by the Fund and the price of the options; counterparty risk; difference in trading hours for the options markets and the markets for the underlying securities (rate movements can take place in the underlying markets that cannot be reflected in the options markets); and an insufficient liquid secondary market for particular options.
PFI Prospectus | Diversified Income Fund | Derivatives Risk, Credit Default Swaps Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Credit Default Swaps. Credit default swaps involve special risks in addition to those associated with swaps generally because they are difficult to value, are highly susceptible to liquidity and credit risk, and generally pay a return to the party that has paid the premium only in the event of an actual default by the issuer of the underlying obligation (as opposed to a credit downgrade or other indication of financial difficulty). The protection “buyer” in a credit default contract may be obligated to pay the protection “seller” an up-front payment or a periodic stream of payments over the term of the contract, provided, generally, that no credit event on a reference obligation has occurred. If a credit event occurs, the seller generally must pay the buyer the “par value” (i.e., full notional value) of the swap in exchange for an equal face amount of deliverable obligations of the reference entity described in the swap, or the seller may be required to deliver the related net cash amount, if the swap is cash settled. The Fund may be either the buyer or seller in the transaction.
PFI Prospectus | Diversified Income Fund | Derivatives Risk, Currency Contracts Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Currency Contracts. Derivatives related to currency contracts involve the specific risk of government action through exchange controls that would restrict the ability of the fund to deliver or receive currency.
PFI Prospectus | Diversified Income Fund | Derivatives Risk, Futures And Swaps Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Forward Contracts, Futures, and Swaps. Forward contracts, futures, and swaps involve specific risks, including: the imperfect correlation between the change in market value of the instruments held by the fund and the price of the forward contract, future, or swap; possible lack of a liquid secondary market for a forward contract, future, or swap and the resulting inability to close a forward contract, future, or swap when desired; counterparty risk; and if the fund has insufficient cash, it may have to sell securities from its portfolio to meet daily variation margin requirements.
PFI Prospectus | Diversified Income Fund | Derivatives Risk, Options Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Options. Options involve specific risks, including: the imperfect correlation between the change in market value of the instruments held by the Fund and the price of the options; counterparty risk; difference in trading hours for the options markets and the markets for the underlying securities (rate movements can take place in the underlying markets that cannot be reflected in the options markets); and an insufficient liquid secondary market for particular options.
PFI Prospectus | Diversified Income Fund | Emerging Markets Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Emerging Markets Risk. Investments in emerging markets may have more risk than those in developed markets because the emerging markets are less developed and more illiquid. Emerging markets can also be subject to increased social, economic, regulatory, and political uncertainties and can be extremely volatile. The U.S. Securities and Exchange Commission, the U.S. Department of Justice, and other U.S. authorities may be limited in their ability to pursue bad actors in emerging markets, including with respect to fraud.
PFI Prospectus | Diversified Income Fund | Fixed-Income Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Fixed-Income Securities Risk. Fixed-income securities are subject to interest rate, credit quality, and liquidity risks. The market value of fixed-income securities generally declines when interest rates rise, and increased interest rates may adversely affect the liquidity of certain fixed-income securities. Moreover, an issuer of fixed-income securities could default on its payment obligations due to increased interest rates or for other reasons.
PFI Prospectus | Diversified Income Fund | Floating And Variable Rate Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Floating and Variable Rate Securities Risk. The market prices of securities with variable and floating interest rates are generally less sensitive to interest rate changes than are the market prices of securities of fixed interest rates. Floating and variable rate securities may decline in value if market interest rates or interest rates paid by them do not move as expected. Floating and variable rate securities may be subject to greater liquidity risk than other debt securities, meaning that there may be limitations on the Fund’s ability to sell the securities at any given time.
PFI Prospectus | Diversified Income Fund | Foreign Currency Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Foreign Currency Risk. Risks of investing in securities denominated in, or that trade in, foreign (non-U.S.) currencies include changes in foreign exchange rates and foreign exchange restrictions.
PFI Prospectus | Diversified Income Fund | Foreign Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Foreign Securities Risk. The risks of foreign securities include loss of value as a result of: political or economic instability; nationalization, expropriation, or confiscatory taxation; settlement delays; and limited government regulation (including less stringent reporting, accounting, and disclosure standards than are required of U.S. companies).
PFI Prospectus | Diversified Income Fund | Hedging Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Hedging Risk. A fund that implements a hedging strategy using derivatives and/or securities could expose the fund to the risk that can arise when a change in the value of a hedge does not match a change in the value of the asset it hedges. In other words, the change in value of the hedge could move in a direction that does not match the change in value of the underlying asset, resulting in a risk of loss to the fund.
PFI Prospectus | Diversified Income Fund | High Yield Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock High Yield Securities Risk. High yield fixed-income securities (commonly referred to as “junk bonds”) are subject to greater credit quality risk than higher rated fixed-income securities and should be considered speculative.
PFI Prospectus | Diversified Income Fund | Index (Passive) Strategy Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Index (Passive) Strategy Risk. An index (passive) fund (or passive strategy that is part of a fund) has operating and other expenses while an index does not. As a result, over time, index funds tend to underperform the index. The correlation between an index strategy’s performance and index performance may also be affected by the type of passive investment approach used (sampling or replication), changes in securities markets, changes in the composition of the index, and the timing of purchases and sales of shares.
PFI Prospectus | Diversified Income Fund | Portfolio Duration Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Portfolio Duration Risk. Portfolio duration is a measure of the expected life of a fixed-income security and its sensitivity to changes in interest rates. The longer a fund’s average portfolio duration, the more sensitive the fund will be to changes in interest rates, which means funds with longer average portfolio durations may be more volatile than those with shorter durations.
PFI Prospectus | Diversified Income Fund | Preferred Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Preferred Securities Risk. Because preferred securities have a lower priority claim on assets or earnings than senior bonds and other debt instruments in a company’s capital structure, they are subject to greater credit and liquidation risk than more senior debt instruments. In addition, preferred securities are subject to other risks, such as limited or no voting rights, deferring or skipping distributions, interest rate risk, and redeeming the security prior to any stated maturity date.
PFI Prospectus | Diversified Income Fund | Redemption And Large Transaction Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Redemption and Large Transaction Risk. Ownership of the Fund’s shares may be concentrated in one or a few large investors (such as funds of funds, institutional investors, and asset allocation programs) that may redeem or purchase shares in large quantities. These transactions may cause the Fund to sell securities to meet redemptions or to invest additional cash at times it would not otherwise do so, which may result in increased transaction costs, increased expenses, changes to expense ratios, and adverse effects to Fund performance. Such transactions may also accelerate the realization of taxable income if sales of portfolio securities result in gains. Moreover, reallocations by large shareholders among share classes of a fund may result in changes to the expense ratios of affected classes, which may increase the expenses paid by shareholders of the class that experienced the redemption.
PFI Prospectus | Diversified Income Fund | Securitized Products Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Securitized Products Risk. Investments in securitized products are subject to risks similar to traditional fixed-income securities, such as credit, interest rate, liquidity, prepayment, extension, and default risk, as well as additional risks associated with the nature of the assets and the servicing of those assets. Unscheduled prepayments on securitized products may have to be reinvested at lower rates. A reduction in prepayments may increase the effective maturities of these securities, exposing them to the risk of decline in market value over time (extension risk).
PFI Prospectus | Diversified Income Fund | Bloomberg U.S. Aggregate Bond Index (reflects no deduction for fees, expenses, or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
Label rr_AverageAnnualReturnLabel Bloomberg U.S. Aggregate Bond Index (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 5.53%
5 Years rr_AverageAnnualReturnYear05 1.10%
10 Years rr_AverageAnnualReturnYear10 1.81%
PFI Prospectus | Diversified Income Fund | Class A  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PGBAX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 3.75%
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.65% [6]
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.13%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.02%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.05%
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.05%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 478
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 697
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 933
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,609
Annual Return 2014 rr_AnnualReturn2014 6.20%
Annual Return 2015 rr_AnnualReturn2015 (2.52%)
Annual Return 2016 rr_AnnualReturn2016 9.30%
Annual Return 2017 rr_AnnualReturn2017 9.85%
Annual Return 2018 rr_AnnualReturn2018 (5.67%)
Annual Return 2019 rr_AnnualReturn2019 13.41%
Annual Return 2020 rr_AnnualReturn2020 1.53%
Annual Return 2021 rr_AnnualReturn2021 8.25%
Annual Return 2022 rr_AnnualReturn2022 (11.51%)
Annual Return 2023 rr_AnnualReturn2023 8.28%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Highest return for a quarter during the period of the bar chart above:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Dec. 31, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 8.39%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Lowest return for a quarter during the period of the bar chart above:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (17.02%)
Label rr_AverageAnnualReturnLabel Class A Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 4.20%
5 Years rr_AverageAnnualReturnYear05 2.82%
10 Years rr_AverageAnnualReturnYear10 3.03%
PFI Prospectus | Diversified Income Fund | Class A | After Taxes on Distributions  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Class A Return After Taxes on Distributions
1 Year rr_AverageAnnualReturnYear01 1.77%
5 Years rr_AverageAnnualReturnYear05 0.96%
10 Years rr_AverageAnnualReturnYear10 1.10%
PFI Prospectus | Diversified Income Fund | Class A | After Taxes on Distributions and Sales  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Class A Return After Taxes on Distributions and Sale of Fund Shares
1 Year rr_AverageAnnualReturnYear01 2.57%
5 Years rr_AverageAnnualReturnYear05 1.44%
10 Years rr_AverageAnnualReturnYear10 1.54%
PFI Prospectus | Diversified Income Fund | Class C  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PGDCX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.65% [6]
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.14%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.02%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.81%
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.81%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 284
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 569
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 980
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,927
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 184
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 569
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 980
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,927
Label rr_AverageAnnualReturnLabel Class C Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 6.40%
5 Years rr_AverageAnnualReturnYear05 2.82%
10 Years rr_AverageAnnualReturnYear10 2.80%
PFI Prospectus | Diversified Income Fund | Institutional Class  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PGDIX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.65% [6]
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.11%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.02%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.78%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.08%) [7]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.70%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 72
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 241
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 425
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 959
Label rr_AverageAnnualReturnLabel Institutional Class Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 8.52%
5 Years rr_AverageAnnualReturnYear05 3.95%
10 Years rr_AverageAnnualReturnYear10 3.75%
PFI Prospectus | Diversified Income Fund | Class R-6  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PGBLX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.65% [6]
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.05%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.02%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.72%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.03%) [7]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.69%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 70
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 227
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 398
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 892
Label rr_AverageAnnualReturnLabel Class R-6 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 8.63%
5 Years rr_AverageAnnualReturnYear05 3.98%
10 Years rr_AverageAnnualReturnYear10 3.76%
PFI Prospectus | Diversified International Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading DIVERSIFIED INTERNATIONAL FUND
Objective [Heading] rr_ObjectiveHeading Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The Fund seeks long-term growth of capital.
Expense [Heading] rr_ExpenseHeading Fees and Expenses of the Fund
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock
This table describes the fees and expenses that you may pay if you buy, hold, and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in Class A Shares of Principal Funds, Inc. More information about these and other discounts is available from your financial intermediary and in “Choosing a Share Class and The Costs of Investing” beginning on page 426 of the Fund’s Prospectus, Appendix B to the Prospectus titled “Intermediary-Specific Sales Charge Waivers and Reductions,” and “Multiple Class Structure” beginning on page 70 of the Fund’s Statement of Additional Information.
If you purchase Institutional Class or Class R-6 shares through certain programs offered by certain financial intermediaries, you may be required to pay a commission and/or other forms of compensation to the broker, or to your Financial Professional or other financial intermediary.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder Fees (fees paid directly from your investment)
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination February 28, 2025
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock
The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in Annual Fund Operating Expenses or in the Example, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 42.2% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 42.20%
Expense Breakpoint Discounts [Text] rr_ExpenseBreakpointDiscounts You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in Class A Shares of Principal Funds, Inc.
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 50,000
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. The calculation of costs takes into account any applicable contractual fee waivers and/or expense reimbursements for the period noted in the table above. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, No Redemption, By Year, Caption [Text] rr_ExpenseExampleNoRedemptionByYearCaption With respect to Class J shares, you would pay the following expenses if you did not redeem your shares (all other classes would be the same as in the above example):
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
The Fund invests primarily in foreign equity securities. The Fund has no limitation on the percentage of assets that are invested in any one country or denominated in any one currency, but the Fund typically invests in foreign securities of at least 20 countries. Primary consideration is given to securities of issuers of developed areas (for example, Japan, Western Europe, Canada, Australia, Hong Kong, and Singapore); however, the Fund also invests in emerging market securities. The Fund invests in equity securities regardless of market capitalization size (small, medium, or large) and style (growth or value).
Risk [Heading] rr_RiskHeading Principal Risks
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
The following information provides some indication of the risks of investing in the Fund. Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. You may get updated performance information at www.PrincipalAM.com.
The bar chart shows the investment returns of the Fund’s Class A shares for each full calendar year of operations for 10 years (or, if shorter, the life of the Fund). These annual returns do not reflect sales charges on Class A shares; if they did, results would be lower. The table shows for the last one, five, and ten calendar year periods (or, if shorter, the life of the Fund), how the Fund’s average annual total returns compare with those of one or more broad measures of market performance.
For periods prior to the inception date of Class R-6 shares (March 1, 2019), the performance shown in the table for Class R-6 shares is that of the Fund’s Class R-3 shares, adjusted to reflect the fees and expenses of Class R-6 shares. However, where the adjustment for fees and expenses results in performance for Class R-6 shares that is higher than the historical performance of the Class R-3 shares, the historical performance of the Class R-3 shares is used. These adjustments result in performance for such periods that is no higher than the historical performance of the Class R-3 shares.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following information provides some indication of the risks of investing in the Fund.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.PrincipalAM.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.
Bar Chart [Heading] rr_BarChartHeading Total Returns as of December 31
Bar Chart Does Not Reflect Sales Loads [Text] rr_BarChartDoesNotReflectSalesLoads These annual returns do not reflect sales charges on Class A shares; if they did, results would be lower.
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
Highest return for a quarter during the period of the bar chart above:
Q2 202017.41 %
Lowest return for a quarter during the period of the bar chart above:
Q1 2020(22.11)%
Performance Table Heading rr_PerformanceTableHeading Average Annual Total ReturnsFor the periods ended December 31, 2023
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are shown for Class A shares only and would be different for the other share classes.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock
After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. After-tax returns are shown for Class A shares only and would be different for the other share classes.
PFI Prospectus | Diversified International Fund | Risk Lose Money [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Many factors affect that value, and it is possible to lose money by investing in the Fund.
PFI Prospectus | Diversified International Fund | Risk Not Insured Depository Institution [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
PFI Prospectus | Diversified International Fund | Emerging Markets Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Emerging Markets Risk. Investments in emerging markets may have more risk than those in developed markets because the emerging markets are less developed and more illiquid. Emerging markets can also be subject to increased social, economic, regulatory, and political uncertainties and can be extremely volatile. The U.S. Securities and Exchange Commission, the U.S. Department of Justice, and other U.S. authorities may be limited in their ability to pursue bad actors in emerging markets, including with respect to fraud.
PFI Prospectus | Diversified International Fund | Equity Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Equity Securities Risk. A variety of factors can negatively impact the value of equity securities held by a fund, including a decline in the issuer’s financial condition, unfavorable performance of the issuer’s sector or industry, or changes in response to overall market and economic conditions. A fund’s principal market segment(s) (such as market capitalization or style) may underperform other market segments or the equity markets as a whole.
•Growth Style Risk. Growth investing entails the risk that if growth companies do not increase their earnings at a rate expected by investors, the market price of their stock may decline significantly, even if earnings show an absolute increase. Growth company stocks also typically lack the dividend yield that can lessen price declines in market downturns.
•Smaller Companies Risk. Investments in smaller companies may involve greater risk and price volatility than investments in larger, more mature companies. Smaller companies may have limited product lines, markets, or financial resources; lack the competitive strength of larger companies; have less experienced managers; or depend on a few key employees. Their securities often are less widely held and trade less frequently and in lesser quantities, and their market prices often fluctuate more, than securities of larger companies.
•Value Style Risk. Value investing entails the risk that value stocks may continue to be undervalued by the market for extended periods, including the entire period during which the stock is held by a fund, or the events that would cause the stock price to increase may not occur as anticipated or at all. Moreover, a stock that appears to be undervalued actually may be appropriately priced at a low level and, therefore, would not be profitable for the fund.
PFI Prospectus | Diversified International Fund | Equity Securities Risk, Growth Style Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Growth Style Risk. Growth investing entails the risk that if growth companies do not increase their earnings at a rate expected by investors, the market price of their stock may decline significantly, even if earnings show an absolute increase. Growth company stocks also typically lack the dividend yield that can lessen price declines in market downturns.
PFI Prospectus | Diversified International Fund | Equity Securities Risk, Smaller Companies Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Smaller Companies Risk. Investments in smaller companies may involve greater risk and price volatility than investments in larger, more mature companies. Smaller companies may have limited product lines, markets, or financial resources; lack the competitive strength of larger companies; have less experienced managers; or depend on a few key employees. Their securities often are less widely held and trade less frequently and in lesser quantities, and their market prices often fluctuate more, than securities of larger companies.
PFI Prospectus | Diversified International Fund | Equity Securities Risk, Value Style Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Value Style Risk. Value investing entails the risk that value stocks may continue to be undervalued by the market for extended periods, including the entire period during which the stock is held by a fund, or the events that would cause the stock price to increase may not occur as anticipated or at all. Moreover, a stock that appears to be undervalued actually may be appropriately priced at a low level and, therefore, would not be profitable for the fund.
PFI Prospectus | Diversified International Fund | Foreign Currency Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Foreign Currency Risk. Risks of investing in securities denominated in, or that trade in, foreign (non-U.S.) currencies include changes in foreign exchange rates and foreign exchange restrictions.
PFI Prospectus | Diversified International Fund | Foreign Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Foreign Securities Risk. The risks of foreign securities include loss of value as a result of: political or economic instability; nationalization, expropriation, or confiscatory taxation; settlement delays; and limited government regulation (including less stringent reporting, accounting, and disclosure standards than are required of U.S. companies).
PFI Prospectus | Diversified International Fund | Redemption And Large Transaction Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Redemption and Large Transaction Risk. Ownership of the Fund’s shares may be concentrated in one or a few large investors (such as funds of funds, institutional investors, and asset allocation programs) that may redeem or purchase shares in large quantities. These transactions may cause the Fund to sell securities to meet redemptions or to invest additional cash at times it would not otherwise do so, which may result in increased transaction costs, increased expenses, changes to expense ratios, and adverse effects to Fund performance. Such transactions may also accelerate the realization of taxable income if sales of portfolio securities result in gains. Moreover, reallocations by large shareholders among share classes of a fund may result in changes to the expense ratios of affected classes, which may increase the expenses paid by shareholders of the class that experienced the redemption.
PFI Prospectus | Diversified International Fund | MSCI ACWI Ex USA Index NTR (reflects withholding taxes on foreign dividends, but no deduction for fees, expenses, or other taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects withholding taxes on foreign dividends, but no deduction for fees, expenses, or other taxes)
Label rr_AverageAnnualReturnLabel MSCI ACWI Ex USA Index NTR (reflects withholding taxes on foreign dividends, but no deduction for fees, expenses, or other taxes)
1 Year rr_AverageAnnualReturnYear01 15.62%
5 Years rr_AverageAnnualReturnYear05 7.08%
10 Years rr_AverageAnnualReturnYear10 3.83%
PFI Prospectus | Diversified International Fund | Class A  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PRWLX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 5.50%
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.74%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.30% [8]
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.29%
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.29%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 674
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 936
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,219
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 2,021
Annual Return 2014 rr_AnnualReturn2014 (3.41%)
Annual Return 2015 rr_AnnualReturn2015 (0.80%)
Annual Return 2016 rr_AnnualReturn2016 (0.38%)
Annual Return 2017 rr_AnnualReturn2017 28.08%
Annual Return 2018 rr_AnnualReturn2018 (17.66%)
Annual Return 2019 rr_AnnualReturn2019 22.35%
Annual Return 2020 rr_AnnualReturn2020 16.99%
Annual Return 2021 rr_AnnualReturn2021 9.16%
Annual Return 2022 rr_AnnualReturn2022 (20.10%)
Annual Return 2023 rr_AnnualReturn2023 17.17%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Highest return for a quarter during the period of the bar chart above:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 17.41%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Lowest return for a quarter during the period of the bar chart above:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (22.11%)
Label rr_AverageAnnualReturnLabel Class A Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 10.72%
5 Years rr_AverageAnnualReturnYear05 6.69%
10 Years rr_AverageAnnualReturnYear10 3.36%
PFI Prospectus | Diversified International Fund | Class A | After Taxes on Distributions  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Class A Return After Taxes on Distributions
1 Year rr_AverageAnnualReturnYear01 10.07%
5 Years rr_AverageAnnualReturnYear05 5.81%
10 Years rr_AverageAnnualReturnYear10 2.76%
PFI Prospectus | Diversified International Fund | Class A | After Taxes on Distributions and Sales  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Class A Return After Taxes on Distributions and Sale of Fund Shares
1 Year rr_AverageAnnualReturnYear01 6.65%
5 Years rr_AverageAnnualReturnYear05 5.27%
10 Years rr_AverageAnnualReturnYear10 2.68%
PFI Prospectus | Diversified International Fund | Class J  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PIIJX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.74%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.15%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.30% [8]
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.19%
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.19%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 221
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 378
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 654
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,443
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 121
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 378
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 654
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,443
Label rr_AverageAnnualReturnLabel Class J Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 16.33%
5 Years rr_AverageAnnualReturnYear05 8.02%
10 Years rr_AverageAnnualReturnYear10 4.07%
PFI Prospectus | Diversified International Fund | Institutional Class  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PIIIX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.74%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.19% [8]
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.93%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.05%) [9]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.88%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 90
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 291
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 510
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,138
Label rr_AverageAnnualReturnLabel Institutional Class Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 17.68%
5 Years rr_AverageAnnualReturnYear05 8.32%
10 Years rr_AverageAnnualReturnYear10 4.39%
PFI Prospectus | Diversified International Fund | Class R-1  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PDVIX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.74%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.35%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.58% [8]
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.67%
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.67%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 170
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 526
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 907
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,976
Label rr_AverageAnnualReturnLabel Class R-1 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 16.80%
5 Years rr_AverageAnnualReturnYear05 7.47%
10 Years rr_AverageAnnualReturnYear10 3.53%
PFI Prospectus | Diversified International Fund | Class R-3  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PINRX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.74%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.37% [8]
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.36%
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.36%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 138
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 431
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 745
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,635
Label rr_AverageAnnualReturnLabel Class R-3 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 17.19%
5 Years rr_AverageAnnualReturnYear05 7.80%
10 Years rr_AverageAnnualReturnYear10 3.86%
PFI Prospectus | Diversified International Fund | Class R-4  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PINLX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.74%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.10%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.33% [8]
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.17%
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.17%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 119
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 372
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 644
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,420
Label rr_AverageAnnualReturnLabel Class R-4 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 17.37%
5 Years rr_AverageAnnualReturnYear05 8.02%
10 Years rr_AverageAnnualReturnYear10 4.06%
PFI Prospectus | Diversified International Fund | Class R-5  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PINPX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.74%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.31% [8]
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.05%
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.05%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 107
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 334
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 579
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,283
Label rr_AverageAnnualReturnLabel Class R-5 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 17.52%
5 Years rr_AverageAnnualReturnYear05 8.14%
10 Years rr_AverageAnnualReturnYear10 4.18%
PFI Prospectus | Diversified International Fund | Class R-6  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PDIFX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.74%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.05% [8]
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.79%
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.79%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 81
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 252
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 439
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 978
Label rr_AverageAnnualReturnLabel Class R-6 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 17.79%
5 Years rr_AverageAnnualReturnYear05 8.41%
10 Years rr_AverageAnnualReturnYear10 4.15%
PFI Prospectus | Equity Income Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading EQUITY INCOME FUND
Objective [Heading] rr_ObjectiveHeading Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The Fund seeks to provide current income and long-term growth of income and capital.
Expense [Heading] rr_ExpenseHeading Fees and Expenses of the Fund
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock
This table describes the fees and expenses that you may pay if you buy, hold, and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in Class A Shares of Principal Funds, Inc. More information about these and other discounts is available from your financial intermediary and in “Choosing a Share Class and The Costs of Investing” beginning on page 426 of the Fund’s Prospectus, Appendix B to the Prospectus titled “Intermediary-Specific Sales Charge Waivers and Reductions,” and “Multiple Class Structure” beginning on page 70 of the Fund’s Statement of Additional Information.
If you purchase Institutional Class shares through certain programs offered by certain financial intermediaries, you may be required to pay a commission and/or other forms of compensation to the broker, or to your Financial Professional or other financial intermediary.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder Fees (fees paid directly from your investment)
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination February 28, 2025
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock
The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in Annual Fund Operating Expenses or in the Example, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 13.3% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 13.30%
Expense Breakpoint Discounts [Text] rr_ExpenseBreakpointDiscounts You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in Class A Shares of Principal Funds, Inc.
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 50,000
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example assumes conversion of the Class C shares to Class A shares after the eighth year. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. The calculation of costs takes into account any applicable contractual fee waivers and/or expense reimbursements for the period noted in the table above. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, No Redemption, By Year, Caption [Text] rr_ExpenseExampleNoRedemptionByYearCaption With respect to Class C and J shares, you would pay the following expenses if you did not redeem your shares (all other classes would be the same as in the above example):
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
Under normal circumstances, the Fund invests at least 80% of its net assets, plus any borrowings for investment purposes, in dividend-paying equity securities at the time of purchase. The Fund usually invests in equity securities of companies with large and medium market capitalizations. The Fund invests in value equity securities, an investment strategy that emphasizes buying equity securities that appear to be undervalued. The Fund also invests in securities of foreign issuers.
Strategy Portfolio Concentration [Text] rr_StrategyPortfolioConcentration Under normal circumstances, the Fund invests at least 80% of its net assets, plus any borrowings for investment purposes, in dividend-paying equity securities at the time of purchase.
Risk [Heading] rr_RiskHeading Principal Risks
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
The following information provides some indication of the risks of investing in the Fund. Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. You may get updated performance information at www.PrincipalAM.com.
The bar chart shows the investment returns of the Fund’s Class A shares for each full calendar year of operations for 10 years (or, if shorter, the life of the Fund). These annual returns do not reflect sales charges on Class A shares; if they did, results would be lower. The table shows for the last one, five, and ten calendar year periods (or, if shorter, the life of the Fund), how the Fund’s average annual total returns compare with those of one or more broad measures of market performance.
For periods prior to the inception date of Class J shares (October 9, 2018), the performance shown in the table for Class J shares is that of the Fund’s Class A shares, adjusted to reflect the fees and expenses of Class J shares. However, where the adjustment for fees and expenses results in performance for Class J shares that is higher than the historical performance of the Class A shares, the historical performance of the Class A shares is used without respect to sales charges. These adjustments result in performance for such periods that is no higher than the historical performance of Class A shares.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following information provides some indication of the risks of investing in the Fund.
Performance Additional Market Index [Text] rr_PerformanceAdditionalMarketIndex The Russell 1000 Value Index is included as an additional index for the Fund as it shows how the Fund’s performance compares with the returns of an index of funds with similar investment objectives.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.PrincipalAM.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.
Bar Chart [Heading] rr_BarChartHeading Total Returns as of December 31
Bar Chart Does Not Reflect Sales Loads [Text] rr_BarChartDoesNotReflectSalesLoads These annual returns do not reflect sales charges on Class A shares; if they did, results would be lower.
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
Highest return for a quarter during the period of the bar chart above:
Q4 202015.59 %
Lowest return for a quarter during the period of the bar chart above:
Q1 2020(25.44)%
Performance Table Heading rr_PerformanceTableHeading Average Annual Total ReturnsFor the periods ended December 31, 2023
Performance Table Market Index Changed rr_PerformanceTableMarketIndexChanged Effective March 1, 2024, the Fund changed its primary broad-based index to the Russell 1000 Index in order to meet the revised definition of “broad-based securities market index.”
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are shown for Class A shares only and would be different for the other share classes.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock
After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. After-tax returns are shown for Class A shares only and would be different for the other share classes.
Effective March 1, 2024, the Fund changed its primary broad-based index to the Russell 1000 Index in order to meet the revised definition of “broad-based securities market index.” The Russell 1000 Value Index is included as an additional index for the Fund as it shows how the Fund’s performance compares with the returns of an index of funds with similar investment objectives.
PFI Prospectus | Equity Income Fund | Risk Lose Money [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Many factors affect that value, and it is possible to lose money by investing in the Fund.
PFI Prospectus | Equity Income Fund | Risk Not Insured Depository Institution [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
PFI Prospectus | Equity Income Fund | Equity Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Equity Securities Risk. A variety of factors can negatively impact the value of equity securities held by a fund, including a decline in the issuer’s financial condition, unfavorable performance of the issuer’s sector or industry, or changes in response to overall market and economic conditions. A fund’s principal market segment(s) (such as market capitalization or style) may underperform other market segments or the equity markets as a whole.
•Smaller Companies Risk. Investments in smaller companies may involve greater risk and price volatility than investments in larger, more mature companies. Smaller companies may have limited product lines, markets, or financial resources; lack the competitive strength of larger companies; have less experienced managers; or depend on a few key employees. Their securities often are less widely held and trade less frequently and in lesser quantities, and their market prices often fluctuate more, than securities of larger companies.
•Value Style Risk. Value investing entails the risk that value stocks may continue to be undervalued by the market for extended periods, including the entire period during which the stock is held by a fund, or the events that would cause the stock price to increase may not occur as anticipated or at all. Moreover, a stock that appears to be undervalued actually may be appropriately priced at a low level and, therefore, would not be profitable for the fund.
PFI Prospectus | Equity Income Fund | Equity Securities Risk, Smaller Companies Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Smaller Companies Risk. Investments in smaller companies may involve greater risk and price volatility than investments in larger, more mature companies. Smaller companies may have limited product lines, markets, or financial resources; lack the competitive strength of larger companies; have less experienced managers; or depend on a few key employees. Their securities often are less widely held and trade less frequently and in lesser quantities, and their market prices often fluctuate more, than securities of larger companies.
PFI Prospectus | Equity Income Fund | Equity Securities Risk, Value Style Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Value Style Risk. Value investing entails the risk that value stocks may continue to be undervalued by the market for extended periods, including the entire period during which the stock is held by a fund, or the events that would cause the stock price to increase may not occur as anticipated or at all. Moreover, a stock that appears to be undervalued actually may be appropriately priced at a low level and, therefore, would not be profitable for the fund.
PFI Prospectus | Equity Income Fund | Foreign Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Foreign Securities Risk. The risks of foreign securities include loss of value as a result of: political or economic instability; nationalization, expropriation, or confiscatory taxation; settlement delays; and limited government regulation (including less stringent reporting, accounting, and disclosure standards than are required of U.S. companies).
PFI Prospectus | Equity Income Fund | Redemption And Large Transaction Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Redemption and Large Transaction Risk. Ownership of the Fund’s shares may be concentrated in one or a few large investors (such as funds of funds, institutional investors, and asset allocation programs) that may redeem or purchase shares in large quantities. These transactions may cause the Fund to sell securities to meet redemptions or to invest additional cash at times it would not otherwise do so, which may result in increased transaction costs, increased expenses, changes to expense ratios, and adverse effects to Fund performance. Such transactions may also accelerate the realization of taxable income if sales of portfolio securities result in gains. Moreover, reallocations by large shareholders among share classes of a fund may result in changes to the expense ratios of affected classes, which may increase the expenses paid by shareholders of the class that experienced the redemption.
PFI Prospectus | Equity Income Fund | Russell 1000 Index (reflects no deduction for fees, expenses, or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
Label rr_AverageAnnualReturnLabel Russell 1000 Index (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 26.53%
5 Years rr_AverageAnnualReturnYear05 15.52%
10 Years rr_AverageAnnualReturnYear10 11.80%
PFI Prospectus | Equity Income Fund | Russell 1000 Value Index (reflects no deduction for fees, expenses, or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
Label rr_AverageAnnualReturnLabel Russell 1000 Value Index (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 11.46%
5 Years rr_AverageAnnualReturnYear05 10.91%
10 Years rr_AverageAnnualReturnYear10 8.40%
PFI Prospectus | Equity Income Fund | Class A  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PQIAX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 5.50%
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.50%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.12%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.87%
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.87%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 634
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 812
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,006
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,564
Annual Return 2014 rr_AnnualReturn2014 12.25%
Annual Return 2015 rr_AnnualReturn2015 (4.26%)
Annual Return 2016 rr_AnnualReturn2016 15.15%
Annual Return 2017 rr_AnnualReturn2017 20.54%
Annual Return 2018 rr_AnnualReturn2018 (5.38%)
Annual Return 2019 rr_AnnualReturn2019 28.43%
Annual Return 2020 rr_AnnualReturn2020 6.17%
Annual Return 2021 rr_AnnualReturn2021 21.91%
Annual Return 2022 rr_AnnualReturn2022 (10.84%)
Annual Return 2023 rr_AnnualReturn2023 10.77%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Highest return for a quarter during the period of the bar chart above:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Dec. 31, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 15.59%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Lowest return for a quarter during the period of the bar chart above:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (25.44%)
Label rr_AverageAnnualReturnLabel Class A Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 4.67%
5 Years rr_AverageAnnualReturnYear05 9.18%
10 Years rr_AverageAnnualReturnYear10 8.15%
PFI Prospectus | Equity Income Fund | Class A | After Taxes on Distributions  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Class A Return After Taxes on Distributions
1 Year rr_AverageAnnualReturnYear01 4.00%
5 Years rr_AverageAnnualReturnYear05 8.19%
10 Years rr_AverageAnnualReturnYear10 7.12%
PFI Prospectus | Equity Income Fund | Class A | After Taxes on Distributions and Sales  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Class A Return After Taxes on Distributions and Sale of Fund Shares
1 Year rr_AverageAnnualReturnYear01 3.19%
5 Years rr_AverageAnnualReturnYear05 7.16%
10 Years rr_AverageAnnualReturnYear10 6.41%
PFI Prospectus | Equity Income Fund | Class C  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PEUCX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.50%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.15%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.65%
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.65%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 268
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 520
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 897
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,746
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 168
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 520
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 897
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,746
Label rr_AverageAnnualReturnLabel Class C Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 8.89%
5 Years rr_AverageAnnualReturnYear05 9.58%
10 Years rr_AverageAnnualReturnYear10 8.12%
PFI Prospectus | Equity Income Fund | Class J  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PEIJX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.50%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.15%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.16%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.81%
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.81%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 183
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 259
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 450
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,002
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 83
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 259
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 450
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,002
Label rr_AverageAnnualReturnLabel Class J Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 9.85%
5 Years rr_AverageAnnualReturnYear05 10.50%
10 Years rr_AverageAnnualReturnYear10 8.80%
PFI Prospectus | Equity Income Fund | Institutional Class  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PEIIX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.50%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.04%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.54%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.02%) [10]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.52%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 53
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 171
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 300
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 675
Label rr_AverageAnnualReturnLabel Institutional Class Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 11.11%
5 Years rr_AverageAnnualReturnYear05 10.81%
10 Years rr_AverageAnnualReturnYear10 9.16%
PFI Prospectus | Equity Income Fund | Class R-1  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PIEMX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.50%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.35%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.54%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.39%
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.39%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 142
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 440
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 761
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,669
Label rr_AverageAnnualReturnLabel Class R-1 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 10.17%
5 Years rr_AverageAnnualReturnYear05 9.86%
10 Years rr_AverageAnnualReturnYear10 8.22%
PFI Prospectus | Equity Income Fund | Class R-3  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PEIOX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.50%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.33%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.08%
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.08%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 110
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 343
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 595
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,317
Label rr_AverageAnnualReturnLabel Class R-3 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 10.52%
5 Years rr_AverageAnnualReturnYear05 10.20%
10 Years rr_AverageAnnualReturnYear10 8.56%
PFI Prospectus | Equity Income Fund | Class R-4  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PEIPX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.50%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.10%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.29%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.89%
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.89%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 91
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 284
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 493
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,096
Label rr_AverageAnnualReturnLabel Class R-4 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 10.73%
5 Years rr_AverageAnnualReturnYear05 10.41%
10 Years rr_AverageAnnualReturnYear10 8.76%
PFI Prospectus | Equity Income Fund | Class R-5  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PEIQX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.50%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.27%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.77%
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.77%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 79
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 246
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 428
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 954
Label rr_AverageAnnualReturnLabel Class R-5 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 10.85%
5 Years rr_AverageAnnualReturnYear05 10.54%
10 Years rr_AverageAnnualReturnYear10 8.89%
PFI Prospectus | Finisterre Emerging Markets Total Return Bond Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading FINISTERRE EMERGING MARKETS TOTAL RETURN BOND FUND
Objective [Heading] rr_ObjectiveHeading Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The Fund seeks to generate total returns from current income and capital appreciation.
Expense [Heading] rr_ExpenseHeading Fees and Expenses of the Fund
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock
This table describes the fees and expenses that you may pay if you buy, hold, and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below.
If you purchase Institutional Class shares through certain programs offered by certain financial intermediaries, you may be required to pay a commission and/or other forms of compensation to the broker, or to your Financial Professional or other financial intermediary.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder Fees (fees paid directly from your investment):
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination February 28, 2025
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock
The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in Annual Fund Operating Expenses or in the Example, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 139.8% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 139.80%
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. The calculation of costs takes into account any applicable contractual fee waivers and/or expense reimbursements for the period noted in the table above. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
Under normal circumstances, the Fund invests at least 80% of its net assets, plus any borrowings for investment purposes, in bonds and other fixed-income securities that are tied economically to an emerging market, and in derivatives on such investments. The types of fixed-income securities in which the Fund invests include convertible bonds, credit- and index-linked securities, non-registered and restricted securities (including those issued in reliance on Rule 144A and Regulation S), securities issued by distressed or bankrupt issuers, and securities issued by the U.S government or U.S. government-sponsored enterprises. The Fund’s strategies may result in the active and frequent trading of the Fund’s portfolio securities.
The Fund considers a security to be tied economically to an emerging market if one or more of the following criteria is present: (i) the issuer or guarantor of the security has its principal place of business or principal office in an emerging market; (ii) the principal trading market for the security is in an emerging market; (iv) the issuer or guarantor of the security derives a majority of its revenue from emerging markets; or (iv) the currency of settlement of the security is the currency of an emerging market. Emerging markets include frontier markets.
The Fund uses derivatives to enhance return and to hedge and manage investment risks. A derivative is a financial arrangement, the value of which is derived from, or based on, a traditional security, asset, or market index. Specifically, the Fund uses forward contracts, futures, options, and swaps. The Fund invests in cash and cash equivalents to support certain of these investments, as well as for other purposes.
The Fund’s investment process focuses primarily on market level analysis of global markets and political developments and their impact on individual countries and companies in emerging markets. The Fund uses a top-down portfolio construction process, blending both fundamental and technical considerations. The investment strategy provides considerable flexibility to invest in various asset classes, capital structures, maturities, and currencies.
The Fund invests, without limitation, in high yield securities (also known as “junk”) rated at the time of purchase Ba1 or lower by Moody’s Investors Services, Inc., and BB+ or lower by S&P Global Ratings (“S&P Global”). If the security has been rated by only one of the rating agencies, that rating will determine the security’s rating; if the security is rated differently by the rating agencies, the highest rating will be used; and if the security has not been rated by either of the rating agencies, those selecting such investments will determine the security’s quality. The Fund’s holdings range in maturity from overnight to 30 years or more and are not subject to any minimum credit rating standard.
Strategy Portfolio Concentration [Text] rr_StrategyPortfolioConcentration Under normal circumstances, the Fund invests at least 80% of its net assets, plus any borrowings for investment purposes, in bonds and other fixed-income securities that are tied economically to an emerging market, and in derivatives on such investments.
Risk [Heading] rr_RiskHeading Principal Risks
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
The following information provides some indication of the risks of investing in the Fund. Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. You may get updated performance information at www.PrincipalAM.com.
The bar chart shows the investment returns of the Fund’s shares for each full calendar year of operations for 10 years (or, if shorter, the life of the Fund). The table shows for the last one, five, and ten calendar year periods (or, if shorter, the life of the Fund), how the Fund’s average annual total returns compare with those of one or more broad measures of market performance.
Life of Fund returns are measured from the date the Fund’s shares were first sold (July 11, 2016).
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following information provides some indication of the risks of investing in the Fund.
Performance Additional Market Index [Text] rr_PerformanceAdditionalMarketIndex The Finisterre Emerging Markets Total Return Bond Blended Index is included as an additional index for the Fund as it shows how the Fund’s performance compares with the returns of an index of funds with similar investment objectives. Performance of each component of the blended index is also shown. The weightings for the Finisterre Emerging Markets Total Return Bond Blended Index are: 33.33% JPM GBI-EM Global Diversified Index; 33.33% JPM EMBI Global Diversified Index; and 33.33% JPM CEMBI Broad Diversified Index.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.PrincipalAM.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.
Bar Chart [Heading] rr_BarChartHeading Total Returns as of December 31
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
Highest return for a quarter during the period of the bar chart above:Q2 20209.76 %
Lowest return for a quarter during the period of the bar chart above:Q2 2022(11.00)%
Performance Table Heading rr_PerformanceTableHeading Average Annual Total ReturnsFor the periods ended December 31, 2023
Performance Table Market Index Changed rr_PerformanceTableMarketIndexChanged Effective March 1, 2024, the Fund changed its primary broad-based index to the Bloomberg Global Aggregate Bond Index in order to meet the revised definition of “broad-based securities market index.”
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are shown for Institutional Class shares only and would be different for the other share classes.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock
After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. After-tax returns are shown for Institutional Class shares only and would be different for the other share classes.
Effective March 1, 2024, the Fund changed its primary broad-based index to the Bloomberg Global Aggregate Bond Index in order to meet the revised definition of “broad-based securities market index.” The Finisterre Emerging Markets Total Return Bond Blended Index is included as an additional index for the Fund as it shows how the Fund’s performance compares with the returns of an index of funds with similar investment objectives. Performance of each component of the blended index is also shown. The weightings for the Finisterre Emerging Markets Total Return Bond Blended Index are: 33.33% JPM GBI-EM Global Diversified Index; 33.33% JPM EMBI Global Diversified Index; and 33.33% JPM CEMBI Broad Diversified Index.
PFI Prospectus | Finisterre Emerging Markets Total Return Bond Fund | Risk Lose Money [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Many factors affect that value, and it is possible to lose money by investing in the Fund.
PFI Prospectus | Finisterre Emerging Markets Total Return Bond Fund | Risk Not Insured Depository Institution [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
PFI Prospectus | Finisterre Emerging Markets Total Return Bond Fund | Counterparty Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Counterparty Risk. Counterparty risk is the risk that the counterparty to a contract or other obligation will be unable or unwilling to honor its obligations.
PFI Prospectus | Finisterre Emerging Markets Total Return Bond Fund | Convertible Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Convertible Securities Risk. Convertible securities are securities that are convertible into common stock. Convertible securities are subject to credit and interest rate risks associated with fixed-income securities and to stock market risk associated with equity securities.
PFI Prospectus | Finisterre Emerging Markets Total Return Bond Fund | Derivatives Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Derivatives Risk. Derivatives may not move in the direction anticipated by the portfolio manager. Transactions in derivatives may increase volatility, cause the liquidation of portfolio positions when not advantageous to do so, and result in disproportionate losses that may be substantially greater than a fund’s initial investment.
•Currency Contracts. Derivatives related to currency contracts involve the specific risk of government action through exchange controls that would restrict the ability of the fund to deliver or receive currency.
•Forward Contracts, Futures, and Swaps. Forward contracts, futures, and swaps involve specific risks, including: the imperfect correlation between the change in market value of the instruments held by the fund and the price of the forward contract, future, or swap; possible lack of a liquid secondary market for a forward contract, future, or swap and the resulting inability to close a forward contract, future, or swap when desired; counterparty risk; and if the fund has insufficient cash, it may have to sell securities from its portfolio to meet daily variation margin requirements.
•Options. Options involve specific risks, including: the imperfect correlation between the change in market value of the instruments held by the Fund and the price of the options; counterparty risk; difference in trading hours for the options markets and the markets for the underlying securities (rate movements can take place in the underlying markets that cannot be reflected in the options markets); and an insufficient liquid secondary market for particular options.
PFI Prospectus | Finisterre Emerging Markets Total Return Bond Fund | Derivatives Risk, Currency Contracts Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Currency Contracts. Derivatives related to currency contracts involve the specific risk of government action through exchange controls that would restrict the ability of the fund to deliver or receive currency.
PFI Prospectus | Finisterre Emerging Markets Total Return Bond Fund | Derivatives Risk, Forward Contracts, Futures, And Swaps Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Forward Contracts, Futures, and Swaps. Forward contracts, futures, and swaps involve specific risks, including: the imperfect correlation between the change in market value of the instruments held by the fund and the price of the forward contract, future, or swap; possible lack of a liquid secondary market for a forward contract, future, or swap and the resulting inability to close a forward contract, future, or swap when desired; counterparty risk; and if the fund has insufficient cash, it may have to sell securities from its portfolio to meet daily variation margin requirements.
PFI Prospectus | Finisterre Emerging Markets Total Return Bond Fund | Derivatives Risk, Options Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Options. Options involve specific risks, including: the imperfect correlation between the change in market value of the instruments held by the Fund and the price of the options; counterparty risk; difference in trading hours for the options markets and the markets for the underlying securities (rate movements can take place in the underlying markets that cannot be reflected in the options markets); and an insufficient liquid secondary market for particular options.
PFI Prospectus | Finisterre Emerging Markets Total Return Bond Fund | Distressed Investments Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Distressed Investments Risk. A fund’s investment in instruments involving loans, loan participations, bonds, notes, non-performing and sub-performing mortgage loans, many of which are not publicly traded, may involve a substantial degree of risk for the following reasons. These instruments may become illiquid and the prices of such instruments may be extremely volatile. Valuing such instruments may be difficult and a fund may lose all of its investment, or it may be required to accept cash or securities with a value less than the fund’s original investment. Issuers of distressed securities are typically in a weak financial condition and may default, in which case the fund may lose its entire investment.
PFI Prospectus | Finisterre Emerging Markets Total Return Bond Fund | Emerging Markets Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Emerging Markets Risk. Investments in emerging markets may have more risk than those in developed markets because the emerging markets are less developed and more illiquid. Emerging markets can also be subject to increased social, economic, regulatory, and political uncertainties and can be extremely volatile. The U.S. Securities and Exchange Commission, the U.S. Department of Justice, and other U.S. authorities may be limited in their ability to pursue bad actors in emerging markets, including with respect to fraud.
•Defensive Strategy Risk. Because emerging market debt markets are particularly susceptible to adverse market, economic, political, and other conditions, the Fund is more prone to take a defensive position and invest a significant portion of its assets in cash and cash equivalents in response to abnormal market conditions. In taking a large cash position, the Fund’s performance may be adversely affected as the Fund may not be able to benefit from an upswing in the market. Further, the Fund may be unable to pursue or achieve its investment objective when employing such a defensive strategy.
•Frontier Markets Risk. Frontier markets are emerging markets, but generally have small economies or less mature capital markets than more developed emerging markets, and, as a result, the risks of investing in emerging markets are magnified in frontier markets. Frontier markets typically have low trading volumes and the potential for extreme price volatility and illiquidity.
PFI Prospectus | Finisterre Emerging Markets Total Return Bond Fund | Emerging Markets Risk, Defensive Strategy Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Defensive Strategy Risk. Because emerging market debt markets are particularly susceptible to adverse market, economic, political, and other conditions, the Fund is more prone to take a defensive position and invest a significant portion of its assets in cash and cash equivalents in response to abnormal market conditions. In taking a large cash position, the Fund’s performance may be adversely affected as the Fund may not be able to benefit from an upswing in the market. Further, the Fund may be unable to pursue or achieve its investment objective when employing such a defensive strategy.
PFI Prospectus | Finisterre Emerging Markets Total Return Bond Fund | Emerging Markets Risk, Frontier Markets Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Frontier Markets Risk. Frontier markets are emerging markets, but generally have small economies or less mature capital markets than more developed emerging markets, and, as a result, the risks of investing in emerging markets are magnified in frontier markets. Frontier markets typically have low trading volumes and the potential for extreme price volatility and illiquidity.
PFI Prospectus | Finisterre Emerging Markets Total Return Bond Fund | Fixed-Income Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Fixed-Income Securities Risk. Fixed-income securities are subject to interest rate, credit quality, and liquidity risks. The market value of fixed-income securities generally declines when interest rates rise, and increased interest rates may adversely affect the liquidity of certain fixed-income securities. Moreover, an issuer of fixed-income securities could default on its payment obligations due to increased interest rates or for other reasons.
PFI Prospectus | Finisterre Emerging Markets Total Return Bond Fund | Foreign Currency Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Foreign Currency Risk. Risks of investing in securities denominated in, or that trade in, foreign (non-U.S.) currencies include changes in foreign exchange rates and foreign exchange restrictions.
PFI Prospectus | Finisterre Emerging Markets Total Return Bond Fund | Foreign Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Foreign Securities Risk. The risks of foreign securities include loss of value as a result of: political or economic instability; nationalization, expropriation, or confiscatory taxation; settlement delays; and limited government regulation (including less stringent reporting, accounting, and disclosure standards than are required of U.S. companies).
PFI Prospectus | Finisterre Emerging Markets Total Return Bond Fund | Hedging Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Hedging Risk. A fund that implements a hedging strategy using derivatives and/or securities could expose the fund to the risk that can arise when a change in the value of a hedge does not match a change in the value of the asset it hedges. In other words, the change in value of the hedge could move in a direction that does not match the change in value of the underlying asset, resulting in a risk of loss to the fund.
PFI Prospectus | Finisterre Emerging Markets Total Return Bond Fund | High Portfolio Turnover Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock High Portfolio Turnover Risk. High portfolio turnover (more than 100%) caused by active and frequent trading of portfolio securities may result in accelerating the realization of taxable gains and losses, lower fund performance, and increased brokerage costs.
PFI Prospectus | Finisterre Emerging Markets Total Return Bond Fund | High Yield Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock High Yield Securities Risk. High yield fixed-income securities (commonly referred to as “junk bonds”) are subject to greater credit quality risk than higher rated fixed-income securities and should be considered speculative.
PFI Prospectus | Finisterre Emerging Markets Total Return Bond Fund | Leverage Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Leverage Risk. Leverage created by borrowing or certain types of transactions or investments may impair the fund’s liquidity, cause it to liquidate positions at an unfavorable time, increase volatility of the fund’s net asset value, or diminish the fund’s performance.
PFI Prospectus | Finisterre Emerging Markets Total Return Bond Fund | Portfolio Duration Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Portfolio Duration Risk. Portfolio duration is a measure of the expected life of a fixed-income security and its sensitivity to changes in interest rates. The longer a fund’s average portfolio duration, the more sensitive the fund will be to changes in interest rates, which means funds with longer average portfolio durations may be more volatile than those with shorter durations.
PFI Prospectus | Finisterre Emerging Markets Total Return Bond Fund | Redemption And Large Transaction Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Redemption and Large Transaction Risk. Ownership of the Fund’s shares may be concentrated in one or a few large investors (such as funds of funds, institutional investors, and asset allocation programs) that may redeem or purchase shares in large quantities. These transactions may cause the Fund to sell securities to meet redemptions or to invest additional cash at times it would not otherwise do so, which may result in increased transaction costs, increased expenses, changes to expense ratios, and adverse effects to Fund performance. Such transactions may also accelerate the realization of taxable income if sales of portfolio securities result in gains. Moreover, reallocations by large shareholders among share classes of a fund may result in changes to the expense ratios of affected classes, which may increase the expenses paid by shareholders of the class that experienced the redemption.
PFI Prospectus | Finisterre Emerging Markets Total Return Bond Fund | U.S. Government Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock U.S. Government Securities Risk. Yields available from U.S. government securities are generally lower than yields from many other fixed-income securities. The value of U.S. government securities may be adversely impacted by changes in interest rates, changes in the credit rating of the U.S. government, or a default by the U.S. government.
PFI Prospectus | Finisterre Emerging Markets Total Return Bond Fund | U.S. Government-Sponsored Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock U.S. Government-Sponsored Securities Risk. Securities issued by U.S. government-sponsored enterprises such as the Federal Home Loan Mortgage Corporation, the Federal National Mortgage Association, and the Federal Home Loan Banks are not issued or guaranteed by the U.S. government.
PFI Prospectus | Finisterre Emerging Markets Total Return Bond Fund | Volatility Mitigation Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Volatility Mitigation Risk. Volatility mitigation strategies may increase the Fund’s transaction costs, which could increase losses or reduce gains. These strategies may not protect the Fund from market declines and may reduce the Fund’s participation in market gains.
PFI Prospectus | Finisterre Emerging Markets Total Return Bond Fund | Bloomberg U.S. Aggregate Bond Index (reflects no deduction for fees, expenses, or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
Label rr_AverageAnnualReturnLabel Bloomberg Global Aggregate Bond Index (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 5.72%
5 Years rr_AverageAnnualReturnYear05 (0.32%)
Since Inception rr_AverageAnnualReturnSinceInception (0.39%)
PFI Prospectus | Finisterre Emerging Markets Total Return Bond Fund | Finisterre Unconstrained Emerging Markets Bond Blended Index (reflects no deduction for fees, expenses, or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
Label rr_AverageAnnualReturnLabel Finisterre Emerging Markets Total Return Bond Blended Index (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 10.99%
5 Years rr_AverageAnnualReturnYear05 2.05%
Since Inception rr_AverageAnnualReturnSinceInception 2.06%
PFI Prospectus | Finisterre Emerging Markets Total Return Bond Fund | JPM CEMBI Broad Diversified Index (reflects no deduction for fees, expenses, or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
Label rr_AverageAnnualReturnLabel JPM CEMBI Broad Diversified Index (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 9.08%
5 Years rr_AverageAnnualReturnYear05 3.19%
Since Inception rr_AverageAnnualReturnSinceInception 3.05%
PFI Prospectus | Finisterre Emerging Markets Total Return Bond Fund | JPM EMBI Global Diversified Index (reflects no deduction for fees, expenses, or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
Label rr_AverageAnnualReturnLabel JPM EMBI Global Diversified Index (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 11.09%
5 Years rr_AverageAnnualReturnYear05 1.67%
Since Inception rr_AverageAnnualReturnSinceInception 1.62%
PFI Prospectus | Finisterre Emerging Markets Total Return Bond Fund | JPM GBI-EM Global Diversified Index (reflects no deduction for fees, expenses, or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
Label rr_AverageAnnualReturnLabel JPM GBI-EM Global Diversified Index (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 12.70%
5 Years rr_AverageAnnualReturnYear05 1.14%
Since Inception rr_AverageAnnualReturnSinceInception 1.34%
PFI Prospectus | Finisterre Emerging Markets Total Return Bond Fund | Institutional Class  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PFUMX
Shareholder Fee, Other rr_ShareholderFeeOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.75%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.14%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.02%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.91%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.04%) [11]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.87%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 89
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 286
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 500
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,116
Annual Return 2017 rr_AnnualReturn2017 11.23%
Annual Return 2018 rr_AnnualReturn2018 (1.61%)
Annual Return 2019 rr_AnnualReturn2019 14.75%
Annual Return 2020 rr_AnnualReturn2020 7.83%
Annual Return 2021 rr_AnnualReturn2021 (2.99%)
Annual Return 2022 rr_AnnualReturn2022 (9.30%)
Annual Return 2023 rr_AnnualReturn2023 11.20%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Highest return for a quarter during the period of the bar chart above:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 9.76%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Lowest return for a quarter during the period of the bar chart above:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Jun. 30, 2022
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (11.00%)
Label rr_AverageAnnualReturnLabel Institutional Class Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 11.20%
5 Years rr_AverageAnnualReturnYear05 3.90%
Since Inception rr_AverageAnnualReturnSinceInception 4.05%
PFI Prospectus | Finisterre Emerging Markets Total Return Bond Fund | Institutional Class | After Taxes on Distributions  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Institutional Class Return After Taxes on Distributions
1 Year rr_AverageAnnualReturnYear01 8.34%
5 Years rr_AverageAnnualReturnYear05 1.71%
Since Inception rr_AverageAnnualReturnSinceInception 1.75%
PFI Prospectus | Finisterre Emerging Markets Total Return Bond Fund | Institutional Class | After Taxes on Distributions and Sales  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Institutional Class Return After Taxes on Distributions and Sale of Fund Shares
1 Year rr_AverageAnnualReturnYear01 6.62%
5 Years rr_AverageAnnualReturnYear05 2.08%
Since Inception rr_AverageAnnualReturnSinceInception 2.12%
PFI Prospectus | Global Emerging Markets Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading GLOBAL EMERGING MARKETS FUND
Objective [Heading] rr_ObjectiveHeading Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The Fund seeks long-term growth of capital.
Expense [Heading] rr_ExpenseHeading Fees and Expenses of the Fund
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock
This table describes the fees and expenses that you may pay if you buy, hold, and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in Class A Shares of Principal Funds, Inc. More information about these and other discounts is available from your financial intermediary and in “Choosing a Share Class and The Costs of Investing” beginning on page 426 of the Fund’s Prospectus, Appendix B to the Prospectus titled “Intermediary-Specific Sales Charge Waivers and Reductions,” and “Multiple Class Structure” beginning on page 70 of the Fund’s Statement of Additional Information.
If you purchase Institutional Class or Class R-6 shares through certain programs offered by certain financial intermediaries, you may be required to pay a commission and/or other forms of compensation to the broker, or to your Financial Professional or other financial intermediary.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder Fees (fees paid directly from your investment)
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination February 28, 2025
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock
The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in Annual Fund Operating Expenses or in the Example, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 32.4% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 32.40%
Expense Breakpoint Discounts [Text] rr_ExpenseBreakpointDiscounts You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in Class A Shares of Principal Funds, Inc.
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 50,000
Expenses Restated to Reflect Current [Text] rr_ExpensesRestatedToReflectCurrent Fees have been restated to reflect current fees.
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. The calculation of costs takes into account any applicable contractual fee waivers and/or expense reimbursements for the period noted in the table above. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, No Redemption, By Year, Caption [Text] rr_ExpenseExampleNoRedemptionByYearCaption With respect to Class J shares, you would pay the following expenses if you did not redeem your shares (all other classes would be the same as in the above example):
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
Under normal circumstances, the Fund invests at least 80% of its net assets, plus any borrowings for investment purposes, in equity securities of emerging market companies at the time of purchase. The Fund considers a security to be tied economically to an emerging market if one or more of the following criteria is present: (i) the issuer or guarantor of the security has its principal place of business or principal office in an emerging market; (ii) the principal trading market for the security is in an emerging market; (iii) the issuer or guarantor of the security derives a majority of its revenue from emerging markets; or (iv) the currency of settlement of the security is the currency of an emerging market.
The Fund considers “emerging market” to mean any market that is considered to be an emerging market by the international financial community (including the MSCI Emerging Markets Index or Bloomberg Emerging Markets USD Aggregate Bond Index). Emerging markets generally exclude the United States, Canada, Japan, Australia, Hong Kong, Singapore, New Zealand, and most nations located in Western Europe. The Fund invests in equity securities regardless of market capitalization (small, medium, or large) and style (growth or value).
Strategy Portfolio Concentration [Text] rr_StrategyPortfolioConcentration Under normal circumstances, the Fund invests at least 80% of its net assets, plus any borrowings for investment purposes, in equity securities of emerging market companies at the time of purchase.
Risk [Heading] rr_RiskHeading Principal Risks
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
The following information provides some indication of the risks of investing in the Fund. Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. You may get updated performance information at www.PrincipalAM.com.
The bar chart shows the investment returns of the Fund’s Class A shares for each full calendar year of operations for 10 years (or, if shorter, the life of the Fund). These annual returns do not reflect sales charges on Class A shares; if they did, results would be lower. The table shows for the last one, five, and ten calendar year periods (or, if shorter, the life of the Fund), how the Fund’s average annual total returns compare with those of one or more broad measures of market performance.
For periods prior to the inception date of Class R-6 shares (November 22, 2016), the performance shown in the table for Class R-6 shares is that of the Fund’s Class R-3 shares, adjusted to reflect the fees and expenses of Class R-6 shares. However, where the adjustment for fees and expenses results in performance for Class R-6 shares that is higher than the historical performance of the Class R-3 shares, the historical performance of the Class R-3 shares is used. These adjustments result in performance for such periods that is no higher than the historical performance of the Class R-3 shares.
During 2019, the Fund experienced a significant one-time gain of approximately $0.11/share as the result of a settlement in a litigation proceeding. If such gain had not been recognized, the total return amounts expressed herein would have been lower.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following information provides some indication of the risks of investing in the Fund.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.PrincipalAM.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.
Bar Chart [Heading] rr_BarChartHeading Total Returns as of December 31
Bar Chart Does Not Reflect Sales Loads [Text] rr_BarChartDoesNotReflectSalesLoads These annual returns do not reflect sales charges on Class A shares; if they did, results would be lower.
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
Highest return for a quarter during the period of the bar chart above:Q2 202019.56 %
Lowest return for a quarter during the period of the bar chart above:Q1 2020(24.38)%
Performance Table Heading rr_PerformanceTableHeading Average Annual Total ReturnsFor the periods ended December 31, 2023
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are shown for Class A shares only and would be different for the other share classes.
Performance Table Footnotes rr_PerformanceTableFootnotesTextBlock During 2019, the Fund experienced a significant one-time gain of approximately $0.11 per share as a result of a settlement in a litigation proceeding. If such gain had not been recognized, the total return amounts shown for periods that include the year ended December 31, 2019 would have been lower.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock
After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. After-tax returns are shown for Class A shares only and would be different for the other share classes.
PFI Prospectus | Global Emerging Markets Fund | Risk Lose Money [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Many factors affect that value, and it is possible to lose money by investing in the Fund.
PFI Prospectus | Global Emerging Markets Fund | Risk Not Insured Depository Institution [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
PFI Prospectus | Global Emerging Markets Fund | Emerging Markets Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Emerging Markets Risk. Investments in emerging markets may have more risk than those in developed markets because the emerging markets are less developed and more illiquid. Emerging markets can also be subject to increased social, economic, regulatory, and political uncertainties and can be extremely volatile. The U.S. Securities and Exchange Commission, the U.S. Department of Justice, and other U.S. authorities may be limited in their ability to pursue bad actors in emerging markets, including with respect to fraud.
•China Investment Risk. The Fund invests a significant portion of its assets in securities of issuers located or operating in China. Investing in China involves certain heightened risks and considerations, including, among others: frequent trading suspensions and government interventions (including by nationalizing assets); currency exchange rate fluctuations or blockages; limits on using brokers and on foreign ownership; different financial reporting standards; higher dependence on exports and international trade; political and social instability; infectious disease outbreaks; regional and global conflicts; increased trade tariffs, embargoes, and other trade limitations; custody and other risks associated with programs used to access Chinese securities; and uncertainties in tax rules that could result in unexpected tax liabilities for the Fund. Significant portions of the Chinese securities markets may become rapidly illiquid, as Chinese issuers have the ability to suspend the trading of their equity securities. Moreover, actions by the U.S. government, such as delisting of certain Chinese companies from U.S. securities exchanges or otherwise restricting their operations in the U.S., may negatively impact the value of such securities held by the Fund.
PFI Prospectus | Global Emerging Markets Fund | Emerging Markets Risk, China Investment Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock China Investment Risk. The Fund invests a significant portion of its assets in securities of issuers located or operating in China. Investing in China involves certain heightened risks and considerations, including, among others: frequent trading suspensions and government interventions (including by nationalizing assets); currency exchange rate fluctuations or blockages; limits on using brokers and on foreign ownership; different financial reporting standards; higher dependence on exports and international trade; political and social instability; infectious disease outbreaks; regional and global conflicts; increased trade tariffs, embargoes, and other trade limitations; custody and other risks associated with programs used to access Chinese securities; and uncertainties in tax rules that could result in unexpected tax liabilities for the Fund. Significant portions of the Chinese securities markets may become rapidly illiquid, as Chinese issuers have the ability to suspend the trading of their equity securities. Moreover, actions by the U.S. government, such as delisting of certain Chinese companies from U.S. securities exchanges or otherwise restricting their operations in the U.S., may negatively impact the value of such securities held by the Fund.
PFI Prospectus | Global Emerging Markets Fund | Equity Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Equity Securities Risk. A variety of factors can negatively impact the value of equity securities held by a fund, including a decline in the issuer’s financial condition, unfavorable performance of the issuer’s sector or industry, or changes in response to overall market and economic conditions. A fund’s principal market segment(s) (such as market capitalization or style) may underperform other market segments or the equity markets as a whole.
•Growth Style Risk. Growth investing entails the risk that if growth companies do not increase their earnings at a rate expected by investors, the market price of their stock may decline significantly, even if earnings show an absolute increase. Growth company stocks also typically lack the dividend yield that can lessen price declines in market downturns.
•Smaller Companies Risk. Investments in smaller companies may involve greater risk and price volatility than investments in larger, more mature companies. Smaller companies may have limited product lines, markets, or financial resources; lack the competitive strength of larger companies; have less experienced managers; or depend on a few key employees. Their securities often are less widely held and trade less frequently and in lesser quantities, and their market prices often fluctuate more, than securities of larger companies.
•Value Style Risk. Value investing entails the risk that value stocks may continue to be undervalued by the market for extended periods, including the entire period during which the stock is held by a fund, or the events that would cause the stock price to increase may not occur as anticipated or at all. Moreover, a stock that appears to be undervalued actually may be appropriately priced at a low level and, therefore, would not be profitable for the fund.
PFI Prospectus | Global Emerging Markets Fund | Equity Securities Risk, Growth Style Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Growth Style Risk. Growth investing entails the risk that if growth companies do not increase their earnings at a rate expected by investors, the market price of their stock may decline significantly, even if earnings show an absolute increase. Growth company stocks also typically lack the dividend yield that can lessen price declines in market downturns.
PFI Prospectus | Global Emerging Markets Fund | Equity Securities Risk, Smaller Companies Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Smaller Companies Risk. Investments in smaller companies may involve greater risk and price volatility than investments in larger, more mature companies. Smaller companies may have limited product lines, markets, or financial resources; lack the competitive strength of larger companies; have less experienced managers; or depend on a few key employees. Their securities often are less widely held and trade less frequently and in lesser quantities, and their market prices often fluctuate more, than securities of larger companies.
PFI Prospectus | Global Emerging Markets Fund | Equity Securities Risk, Value Style Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Value Style Risk. Value investing entails the risk that value stocks may continue to be undervalued by the market for extended periods, including the entire period during which the stock is held by a fund, or the events that would cause the stock price to increase may not occur as anticipated or at all. Moreover, a stock that appears to be undervalued actually may be appropriately priced at a low level and, therefore, would not be profitable for the fund.
PFI Prospectus | Global Emerging Markets Fund | Foreign Currency Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Foreign Currency Risk. Risks of investing in securities denominated in, or that trade in, foreign (non-U.S.) currencies include changes in foreign exchange rates and foreign exchange restrictions.
PFI Prospectus | Global Emerging Markets Fund | Foreign Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Foreign Securities Risk. The risks of foreign securities include loss of value as a result of: political or economic instability; nationalization, expropriation, or confiscatory taxation; settlement delays; and limited government regulation (including less stringent reporting, accounting, and disclosure standards than are required of U.S. companies).
PFI Prospectus | Global Emerging Markets Fund | Redemption And Large Transaction Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Redemption and Large Transaction Risk. Ownership of the Fund’s shares may be concentrated in one or a few large investors (such as funds of funds, institutional investors, and asset allocation programs) that may redeem or purchase shares in large quantities. These transactions may cause the Fund to sell securities to meet redemptions or to invest additional cash at times it would not otherwise do so, which may result in increased transaction costs, increased expenses, changes to expense ratios, and adverse effects to Fund performance. Such transactions may also accelerate the realization of taxable income if sales of portfolio securities result in gains. Moreover, reallocations by large shareholders among share classes of a fund may result in changes to the expense ratios of affected classes, which may increase the expenses paid by shareholders of the class that experienced the redemption.
PFI Prospectus | Global Emerging Markets Fund | MSCI Emerging Markets Index NTR (reflects withholding taxes on foreign dividends, but no deduction for fees, expenses, or other taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects withholding taxes on foreign dividends, but no deduction for fees, expenses, or other taxes)
Label rr_AverageAnnualReturnLabel MSCI Emerging Markets Index NTR (reflects withholding taxes on foreign dividends, but no deduction for fees, expenses, or other taxes)
1 Year rr_AverageAnnualReturnYear01 9.83%
5 Years rr_AverageAnnualReturnYear05 3.69%
10 Years rr_AverageAnnualReturnYear10 2.66%
PFI Prospectus | Global Emerging Markets Fund | Class A  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PRIAX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 5.50%
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.99% [12]
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.46%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.70%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.25%) [13]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.45%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 689
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 1,033
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,400
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 2,428
Annual Return 2014 rr_AnnualReturn2014 (4.25%)
Annual Return 2015 rr_AnnualReturn2015 (14.10%)
Annual Return 2016 rr_AnnualReturn2016 8.36%
Annual Return 2017 rr_AnnualReturn2017 40.73%
Annual Return 2018 rr_AnnualReturn2018 (21.12%)
Annual Return 2019 rr_AnnualReturn2019 17.21%
Annual Return 2020 rr_AnnualReturn2020 19.33%
Annual Return 2021 rr_AnnualReturn2021 0.43%
Annual Return 2022 rr_AnnualReturn2022 (22.89%)
Annual Return 2023 rr_AnnualReturn2023 12.52%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Highest return for a quarter during the period of the bar chart above:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 19.56%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Lowest return for a quarter during the period of the bar chart above:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (24.38%)
Label rr_AverageAnnualReturnLabel Class A Return Before Taxes [14]
1 Year rr_AverageAnnualReturnYear01 6.31%
5 Years rr_AverageAnnualReturnYear05 2.86% [14]
10 Years rr_AverageAnnualReturnYear10 1.31% [14]
PFI Prospectus | Global Emerging Markets Fund | Class A | After Taxes on Distributions  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Class A Return After Taxes on Distributions [14]
1 Year rr_AverageAnnualReturnYear01 5.98%
5 Years rr_AverageAnnualReturnYear05 2.42% [14]
10 Years rr_AverageAnnualReturnYear10 1.06% [14]
PFI Prospectus | Global Emerging Markets Fund | Class A | After Taxes on Distributions and Sales  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Class A Return After Taxes on Distributions and Sale of Fund Shares [14]
1 Year rr_AverageAnnualReturnYear01 4.19%
5 Years rr_AverageAnnualReturnYear05 2.41% [14]
10 Years rr_AverageAnnualReturnYear10 1.20% [14]
PFI Prospectus | Global Emerging Markets Fund | Class J  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PIEJX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.99% [12]
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.15%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.44%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.58%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.28%) [13]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.30%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 232
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 471
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 834
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,855
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 132
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 471
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 834
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,855
Label rr_AverageAnnualReturnLabel Class J Return Before Taxes [14]
1 Year rr_AverageAnnualReturnYear01 11.73%
5 Years rr_AverageAnnualReturnYear05 4.22% [14]
10 Years rr_AverageAnnualReturnYear10 2.03% [14]
PFI Prospectus | Global Emerging Markets Fund | Institutional Class  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PIEIX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.99% [12]
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.32%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.31%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.21%) [13]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.10%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 112
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 395
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 698
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,561
Label rr_AverageAnnualReturnLabel Institutional Class Return Before Taxes [14]
1 Year rr_AverageAnnualReturnYear01 12.96%
5 Years rr_AverageAnnualReturnYear05 4.40% [14]
10 Years rr_AverageAnnualReturnYear10 2.28% [14]
PFI Prospectus | Global Emerging Markets Fund | Class R-1  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PIXEX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.99% [12]
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.35%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.62%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.96%
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.96%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 199
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 615
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,057
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 2,285
Label rr_AverageAnnualReturnLabel Class R-1 Return Before Taxes [14]
1 Year rr_AverageAnnualReturnYear01 11.95%
5 Years rr_AverageAnnualReturnYear05 3.56% [14]
10 Years rr_AverageAnnualReturnYear10 1.44% [14]
PFI Prospectus | Global Emerging Markets Fund | Class R-3  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PEAPX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.99% [12]
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.41%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.65%
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.65%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 168
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 520
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 897
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,955
Label rr_AverageAnnualReturnLabel Class R-3 Return Before Taxes [14]
1 Year rr_AverageAnnualReturnYear01 12.31%
5 Years rr_AverageAnnualReturnYear05 3.88% [14]
10 Years rr_AverageAnnualReturnYear10 1.75% [14]
PFI Prospectus | Global Emerging Markets Fund | Class R-4  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PESSX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.99% [12]
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.10%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.37%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.46%
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.46%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 149
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 462
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 797
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,746
Label rr_AverageAnnualReturnLabel Class R-4 Return Before Taxes [14]
1 Year rr_AverageAnnualReturnYear01 12.50%
5 Years rr_AverageAnnualReturnYear05 4.07% [14]
10 Years rr_AverageAnnualReturnYear10 1.95% [14]
PFI Prospectus | Global Emerging Markets Fund | Class R-5  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PEPSX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.99% [12]
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.35%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.34%
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.34%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 136
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 425
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 734
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,613
Label rr_AverageAnnualReturnLabel Class R-5 Return Before Taxes [14]
1 Year rr_AverageAnnualReturnYear01 12.65%
5 Years rr_AverageAnnualReturnYear05 4.20% [14]
10 Years rr_AverageAnnualReturnYear10 2.07% [14]
PFI Prospectus | Global Emerging Markets Fund | Class R-6  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PIIMX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.99% [12]
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.45%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.44%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.41%) [13]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.03%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 105
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 415
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 748
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,689
Label rr_AverageAnnualReturnLabel Class R-6 Return Before Taxes [14]
1 Year rr_AverageAnnualReturnYear01 13.07%
5 Years rr_AverageAnnualReturnYear05 4.50% [14]
10 Years rr_AverageAnnualReturnYear10 2.18% [14]
PFI Prospectus | Global Real Estate Securities Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading GLOBAL REAL ESTATE SECURITIES FUND
Objective [Heading] rr_ObjectiveHeading Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The Fund seeks to generate a total return.
Expense [Heading] rr_ExpenseHeading Fees and Expenses of the Fund
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock
This table describes the fees and expenses that you may pay if you buy, hold, and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in Class A Shares of Principal Funds, Inc. More information about these and other discounts is available from your financial intermediary and in “Choosing a Share Class and The Costs of Investing” beginning on page 426 of the Fund’s Prospectus, Appendix B to the Prospectus titled “Intermediary-Specific Sales Charge Waivers and Reductions,” and “Multiple Class Structure” beginning on page 70 of the Fund’s Statement of Additional Information.
If you purchase Institutional Class or Class R-6 shares through certain programs offered by certain financial intermediaries, you may be required to pay a commission and/or other forms of compensation to the broker, or to your Financial Professional or other financial intermediary.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder Fees (fees paid directly from your investment)
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination February 28, 2025
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock
The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in Annual Fund Operating Expenses or in the Example, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 24.3% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 24.30%
Expense Breakpoint Discounts [Text] rr_ExpenseBreakpointDiscounts You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in Class A Shares of Principal Funds, Inc.
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 50,000
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. The calculation of costs takes into account any applicable contractual fee waivers and/or expense reimbursements for the period noted in the table above. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
Under normal circumstances, the Fund invests at least 80% of its net assets, plus any borrowings for investment purposes, in equity securities of U.S. and non-U.S. companies principally engaged in the real estate industry at the time of purchase. For the Fund’s investment policies, a real estate company has at least 50% of its assets, income, or profits derived from products or services related to the real estate industry. Real estate companies include real estate investment trusts (“REITs”) and companies with substantial real estate holdings such as paper, lumber, hotel, and entertainment companies, as well as those whose products and services relate to the real estate industry, such as building supply manufacturers, mortgage lenders, and mortgage servicing companies. The Fund invests in equity securities regardless of market capitalization (small, medium or large). The Fund invests in value equity securities and growth equity securities.
The Fund invests a significant percentage of its portfolio in REITs and foreign REIT-like entities. REITs are pooled investment vehicles that invest in income producing real estate, real estate related loans, or other types of real estate interests. REITs in the U.S. are corporations or business trusts that are permitted to eliminate corporate-level federal income taxes by meeting certain requirements of the Internal Revenue Code. Some foreign countries have adopted REIT structures that are very similar to those in the U.S. Similarities include pass-through tax treatment and portfolio diversification. Other countries have REIT structures that are significantly different than the structure in the U.S., while some countries have not adopted a REIT-like structure at all.
Under normal market conditions, the Fund holds investments tied economically to at least 3 countries and invests a percentage of its net assets in securities of foreign issuers equal to at least the lesser of 40% or the percentage foreign issuers in FTSE EPRA/NAREIT Developed Index minus 10%.
The Fund concentrates its investments (invest more than 25% of its net assets) in securities in the real estate industry.
Strategy Portfolio Concentration [Text] rr_StrategyPortfolioConcentration Under normal market conditions, the Fund holds investments tied economically to at least 3 countries and invests a percentage of its net assets in securities of foreign issuers equal to at least the lesser of 40% or the percentage foreign issuers in FTSE EPRA/NAREIT Developed Index minus 10%.The Fund concentrates its investments (invest more than 25% of its net assets) in securities in the real estate industry.
Risk [Heading] rr_RiskHeading Principal Risks
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
The following information provides some indication of the risks of investing in the Fund. Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. You may get updated performance information at www.PrincipalAM.com.
The bar chart shows the investment returns of the Fund’s Class A shares for each full calendar year of operations for 10 years (or, if shorter, the life of the Fund). These annual returns do not reflect sales charges on Class A shares; if they did, results would be lower. The table shows for the last one, five, and ten calendar year periods (or, if shorter, the life of the Fund), how the Fund’s average annual total returns compare with those of one or more broad measures of market performance.
For periods prior to the inception date of Class R-6 shares (November 25, 2014) and Classes R-3, R-4, and R-5 shares (March 1, 2016), the performance shown in the table for these newer classes is that of the Fund’s Institutional Class shares, adjusted to reflect the respective fees and expenses of each class. These adjustments result in performance for such periods that is no higher than the historical performance of the Institutional Class shares.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following information provides some indication of the risks of investing in the Fund.
Performance Additional Market Index [Text] rr_PerformanceAdditionalMarketIndex The FTSE EPRA/NAREIT Developed Index NTR is included as an additional index for the Fund as it shows how the Fund’s performance compares with the returns of an index of funds with similar investment objectives.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.PrincipalAM.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.
Bar Chart [Heading] rr_BarChartHeading Total Returns as of December 31
Bar Chart Does Not Reflect Sales Loads [Text] rr_BarChartDoesNotReflectSalesLoads These annual returns do not reflect sales charges on Class A shares; if they did, results would be lower.
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
Highest return for a quarter during the period of the bar chart above:Q4 202315.65 %
Lowest return for a quarter during the period of the bar chart above:Q1 2020(25.65)%
Performance Table Heading rr_PerformanceTableHeading Average Annual Total ReturnsFor the periods ended December 31, 2023
Performance Table Market Index Changed rr_PerformanceTableMarketIndexChanged Effective March 1, 2024, the Fund changed its primary broad-based index to the MSCI ACWI NR USD Index in order to meet the revised definition of “broad-based securities market index.”
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are shown for Class A shares only and would be different for the other share classes.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock
After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. After-tax returns are shown for Class A shares only and would be different for the other share classes.
Effective March 1, 2024, the Fund changed its primary broad-based index to the MSCI ACWI NR USD Index in order to meet the revised definition of “broad-based securities market index.” The FTSE EPRA/NAREIT Developed Index NTR is included as an additional index for the Fund as it shows how the Fund’s performance compares with the returns of an index of funds with similar investment objectives.
PFI Prospectus | Global Real Estate Securities Fund | Risk Lose Money [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Many factors affect that value, and it is possible to lose money by investing in the Fund.
PFI Prospectus | Global Real Estate Securities Fund | Risk Not Insured Depository Institution [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
PFI Prospectus | Global Real Estate Securities Fund | Equity Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Equity Securities Risk. A variety of factors can negatively impact the value of equity securities held by a fund, including a decline in the issuer’s financial condition, unfavorable performance of the issuer’s sector or industry, or changes in response to overall market and economic conditions. A fund’s principal market segment(s) (such as market capitalization or style) may underperform other market segments or the equity markets as a whole.
•Growth Style Risk. Growth investing entails the risk that if growth companies do not increase their earnings at a rate expected by investors, the market price of their stock may decline significantly, even if earnings show an absolute increase. Growth company stocks also typically lack the dividend yield that can lessen price declines in market downturns.
•Smaller Companies Risk. Investments in smaller companies may involve greater risk and price volatility than investments in larger, more mature companies. Smaller companies may have limited product lines, markets, or financial resources; lack the competitive strength of larger companies; have less experienced managers; or depend on a few key employees. Their securities often are less widely held and trade less frequently and in lesser quantities, and their market prices often fluctuate more, than securities of larger companies.
•Value Style Risk. Value investing entails the risk that value stocks may continue to be undervalued by the market for extended periods, including the entire period during which the stock is held by a fund, or the events that would cause the stock price to increase may not occur as anticipated or at all. Moreover, a stock that appears to be undervalued actually may be appropriately priced at a low level and, therefore, would not be profitable for the fund.
PFI Prospectus | Global Real Estate Securities Fund | Equity Securities Risk, Growth Style Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Growth Style Risk. Growth investing entails the risk that if growth companies do not increase their earnings at a rate expected by investors, the market price of their stock may decline significantly, even if earnings show an absolute increase. Growth company stocks also typically lack the dividend yield that can lessen price declines in market downturns.
PFI Prospectus | Global Real Estate Securities Fund | Equity Securities Risk, Smaller Companies Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Smaller Companies Risk. Investments in smaller companies may involve greater risk and price volatility than investments in larger, more mature companies. Smaller companies may have limited product lines, markets, or financial resources; lack the competitive strength of larger companies; have less experienced managers; or depend on a few key employees. Their securities often are less widely held and trade less frequently and in lesser quantities, and their market prices often fluctuate more, than securities of larger companies.
PFI Prospectus | Global Real Estate Securities Fund | Equity Securities Risk, Value Style Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Value Style Risk. Value investing entails the risk that value stocks may continue to be undervalued by the market for extended periods, including the entire period during which the stock is held by a fund, or the events that would cause the stock price to increase may not occur as anticipated or at all. Moreover, a stock that appears to be undervalued actually may be appropriately priced at a low level and, therefore, would not be profitable for the fund.
PFI Prospectus | Global Real Estate Securities Fund | Foreign Currency Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Foreign Currency Risk. Risks of investing in securities denominated in, or that trade in, foreign (non-U.S.) currencies include changes in foreign exchange rates and foreign exchange restrictions.
PFI Prospectus | Global Real Estate Securities Fund | Foreign Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Foreign Securities Risk. The risks of foreign securities include loss of value as a result of: political or economic instability; nationalization, expropriation, or confiscatory taxation; settlement delays; and limited government regulation (including less stringent reporting, accounting, and disclosure standards than are required of U.S. companies).
PFI Prospectus | Global Real Estate Securities Fund | Industry Concentration Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Industry Concentration Risk. A fund that concentrates investments in a particular industry or group of industries has greater exposure than other funds to market, economic, and other factors affecting that industry or group of industries.
PFI Prospectus | Global Real Estate Securities Fund | Industry Concentration Risk, Real Estate Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Real Estate. A fund concentrating in the real estate industry is subject to the risks associated with direct ownership of real estate, securities of companies in the real estate industry, and/or real estate investment trusts. These risks are explained more fully below in Real Estate Investment Trusts (REITs) Risk and Real Estate Securities Risk.
PFI Prospectus | Global Real Estate Securities Fund | Real Estate Investment Trusts ("REITs") Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Real Estate Investment Trusts (“REITs”) Risk. In addition to risks associated with investing in real estate securities, REITs are dependent upon management skills, are not diversified, and are subject to heavy cash flow dependency, risks of default by borrowers, and self-liquidation. Investment in REITs also involves risks similar to risks of investing in small market capitalization companies, such as limited financial resources, less frequent and limited volume trading, and may be subject to more abrupt or erratic price movements than larger company securities. A REIT could fail to qualify for tax-free pass-through of income under the Internal Revenue Code. Fund shareholders will indirectly bear their proportionate share of the expenses of REITs in which the fund invests.
PFI Prospectus | Global Real Estate Securities Fund | Real Estate Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Real Estate Securities Risk. Investing in real estate securities subjects the fund to the risks associated with the real estate market (which are similar to the risks associated with direct ownership in real estate), including declines in real estate values, loss due to casualty or condemnation, property taxes, interest rate changes, increased expenses, cash flow of underlying real estate assets, regulatory changes (including zoning, land use, and rents), and environmental problems, as well as to the risks related to the management skill and creditworthiness of the issuer.
PFI Prospectus | Global Real Estate Securities Fund | Redemption And Large Transaction Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Redemption and Large Transaction Risk. Ownership of the Fund’s shares may be concentrated in one or a few large investors (such as funds of funds, institutional investors, and asset allocation programs) that may redeem or purchase shares in large quantities. These transactions may cause the Fund to sell securities to meet redemptions or to invest additional cash at times it would not otherwise do so, which may result in increased transaction costs, increased expenses, changes to expense ratios, and adverse effects to Fund performance. Such transactions may also accelerate the realization of taxable income if sales of portfolio securities result in gains. Moreover, reallocations by large shareholders among share classes of a fund may result in changes to the expense ratios of affected classes, which may increase the expenses paid by shareholders of the class that experienced the redemption.
PFI Prospectus | Global Real Estate Securities Fund | MSCI ACWI NR USD Index (reflects withholding taxes on foreign dividends, but no deduction for fees, expenses, or other taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects withholding taxes on foreign dividends, but no deduction for fees, expenses, or other taxes)
Label rr_AverageAnnualReturnLabel MSCI ACWI NR USD Index (reflects withholding taxes on foreign dividends, but no deduction for fees, expenses, or other taxes)
1 Year rr_AverageAnnualReturnYear01 22.20%
5 Years rr_AverageAnnualReturnYear05 11.72%
10 Years rr_AverageAnnualReturnYear10 7.93%
PFI Prospectus | Global Real Estate Securities Fund | FTSE EPRA/NAREIT Developed Markets Index NTR (reflects withholding taxes on foreign dividends, but no deduction for fees, expenses, or other taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects withholding taxes on foreign dividends, but no deduction for fees, expenses, or other taxes)
Label rr_AverageAnnualReturnLabel FTSE EPRA/NAREIT Developed Index NTR (reflects withholding taxes on foreign dividends, but no deduction for fees, expenses, or other taxes)
1 Year rr_AverageAnnualReturnYear01 9.67%
5 Years rr_AverageAnnualReturnYear05 2.81%
10 Years rr_AverageAnnualReturnYear10 3.57%
PFI Prospectus | Global Real Estate Securities Fund | Class A  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol POSAX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 5.50%
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.87%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.24%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.36%
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.36%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 681
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 957
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,254
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 2,095
Annual Return 2014 rr_AnnualReturn2014 15.76%
Annual Return 2015 rr_AnnualReturn2015 1.09%
Annual Return 2016 rr_AnnualReturn2016 0.05%
Annual Return 2017 rr_AnnualReturn2017 14.30%
Annual Return 2018 rr_AnnualReturn2018 (3.70%)
Annual Return 2019 rr_AnnualReturn2019 23.92%
Annual Return 2020 rr_AnnualReturn2020 (4.20%)
Annual Return 2021 rr_AnnualReturn2021 23.02%
Annual Return 2022 rr_AnnualReturn2022 (27.03%)
Annual Return 2023 rr_AnnualReturn2023 10.40%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Highest return for a quarter during the period of the bar chart above:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Dec. 31, 2023
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 15.65%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Lowest return for a quarter during the period of the bar chart above:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (25.65%)
Label rr_AverageAnnualReturnLabel Class A Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 4.34%
5 Years rr_AverageAnnualReturnYear05 2.14%
10 Years rr_AverageAnnualReturnYear10 3.66%
PFI Prospectus | Global Real Estate Securities Fund | Class A | After Taxes on Distributions  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Class A Return After Taxes on Distributions
1 Year rr_AverageAnnualReturnYear01 3.58%
5 Years rr_AverageAnnualReturnYear05 1.39%
10 Years rr_AverageAnnualReturnYear10 2.63%
PFI Prospectus | Global Real Estate Securities Fund | Class A | After Taxes on Distributions and Sales  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Class A Return After Taxes on Distributions and Sale of Fund Shares
1 Year rr_AverageAnnualReturnYear01 2.80%
5 Years rr_AverageAnnualReturnYear05 1.53%
10 Years rr_AverageAnnualReturnYear10 2.56%
PFI Prospectus | Global Real Estate Securities Fund | Institutional Class  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol POSIX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.87%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.14%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.01%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.07%) [15]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.94%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 96
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 315
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 551
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,230
Label rr_AverageAnnualReturnLabel Institutional Class Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 10.85%
5 Years rr_AverageAnnualReturnYear05 3.71%
10 Years rr_AverageAnnualReturnYear10 4.66%
PFI Prospectus | Global Real Estate Securities Fund | Class R-3  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PGRKX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.87%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.33%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.45%
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.45%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 148
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 459
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 792
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,735
Label rr_AverageAnnualReturnLabel Class R-3 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 10.22%
5 Years rr_AverageAnnualReturnYear05 3.20%
10 Years rr_AverageAnnualReturnYear10 4.13%
PFI Prospectus | Global Real Estate Securities Fund | Class R-4  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PGRVX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.87%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.10%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.29%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.26%
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.26%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 128
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 400
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 692
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,523
Label rr_AverageAnnualReturnLabel Class R-4 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 10.45%
5 Years rr_AverageAnnualReturnYear05 3.38%
10 Years rr_AverageAnnualReturnYear10 4.32%
PFI Prospectus | Global Real Estate Securities Fund | Class R-5  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PGRUX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.87%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.27%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.14%
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.14%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 116
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 362
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 628
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,386
Label rr_AverageAnnualReturnLabel Class R-5 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 10.69%
5 Years rr_AverageAnnualReturnYear05 3.54%
10 Years rr_AverageAnnualReturnYear10 4.47%
PFI Prospectus | Global Real Estate Securities Fund | Class R-6  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PGRSX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.87%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.02%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.89%
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.89%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 91
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 284
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 493
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,096
Label rr_AverageAnnualReturnLabel Class R-6 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 10.91%
5 Years rr_AverageAnnualReturnYear05 3.79%
10 Years rr_AverageAnnualReturnYear10 4.69%
PFI Prospectus | Government & High Quality Bond Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading GOVERNMENT & HIGH QUALITY BOND FUND
Objective [Heading] rr_ObjectiveHeading Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The Fund seeks to provide a high level of current income consistent with safety and liquidity.
Expense [Heading] rr_ExpenseHeading Fees and Expenses of the Fund
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock
This table describes the fees and expenses that you may pay if you buy, hold, and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $100,000 in Class A Shares of Principal Funds, Inc. More information about these and other discounts is available from your financial intermediary and in “Choosing a Share Class and The Costs of Investing” beginning on page 426 of the Fund’s Prospectus, Appendix B to the Prospectus titled “Intermediary-Specific Sales Charge Waivers and Reductions,” and “Multiple Class Structure” beginning on page 70 of the Fund’s Statement of Additional Information.
If you purchase Institutional Class shares through certain programs offered by certain financial intermediaries, you may be required to pay a commission and/or other forms of compensation to the broker, or to your Financial Professional or other financial intermediary.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder Fees (fees paid directly from your investment)
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination February 28, 2025
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock
The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in Annual Fund Operating Expenses or in the Example, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 128.0% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 128.00%
Expense Breakpoint Discounts [Text] rr_ExpenseBreakpointDiscounts You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $100,000 in Class A Shares of Principal Funds, Inc.
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 100,000
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. The calculation of costs takes into account any applicable contractual fee waivers and/or expense reimbursements for the period noted in the table above. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, No Redemption, By Year, Caption [Text] rr_ExpenseExampleNoRedemptionByYearCaption With respect to Class J shares, you would pay the following expenses if you did not redeem your shares (all other classes would be the same as in the above example):
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
Under normal circumstances, the Fund invests at least 80% of its net assets, plus any borrowings for investment purposes, in debt securities issued by the U.S. government, its agencies, or instrumentalities or debt securities that are rated, at the time of purchase, AAA by S&P Global Ratings (“S&P Global”) or Aaa by Moody’s Investors Service, Inc. (“Moody’s”), including, but not limited to, asset-backed securities (“ABS”), mortgage securities such as agency and non-agency collateralized mortgage obligations, and other obligations that are secured by mortgages or mortgage-backed securities (“MBS”) (also referred to as securitized products). The Fund also invests in ABS and MBS that are rated lower than AAA by S&P Global or Aaa by Moody’s (or of comparable quality), including collateralized mortgage obligations, and in other obligations that are secured by mortgages or MBS. The MBS in which the Fund invests include MBS trading in the to-be-announced (“TBA”) markets. If a security has been rated by only one of the rating agencies, that rating will determine the security’s rating; if the security is rated differently by the rating agencies, the highest rating will be used; and if the security has not been rated by either of the rating agencies, those selecting such investments will determine the security’s quality.
Under normal circumstances, the Fund maintains an average portfolio duration that is within ±50% of the duration of the Bloomberg U.S. Agency Fixed Rate MBS Index, which as of January 31, 2024 was 5.72 years. The Fund is not managed to a particular maturity. The Fund’s strategies may result in the active and frequent trading of the Fund’s portfolio securities.
The Fund invests in derivatives, including Treasury futures and securities delivered in TBA transactions, to manage the fixed-income exposure. A derivative is a financial arrangement, the value of which is derived from, or based on, a traditional security, asset, or market index.
Strategy Portfolio Concentration [Text] rr_StrategyPortfolioConcentration Under normal circumstances, the Fund maintains an average portfolio duration that is within ±50% of the duration of the Bloomberg U.S. Agency Fixed Rate MBS Index, which as of January 31, 2024 was 5.72 years. The Fund is not managed to a particular maturity. The Fund’s strategies may result in the active and frequent trading of the Fund’s portfolio securities.
Risk [Heading] rr_RiskHeading Principal Risks
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
The following information provides some indication of the risks of investing in the Fund. Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. You may get updated performance information at www.PrincipalAM.com.
The bar chart shows the investment returns of the Fund’s Class A shares for each full calendar year of operations for 10 years (or, if shorter, the life of the Fund). These annual returns do not reflect sales charges on Class A shares; if they did, results would be lower. The table shows for the last one, five, and ten calendar year periods (or, if shorter, the life of the Fund), how the Fund’s average annual total returns compare with those of one or more broad measures of market performance.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following information provides some indication of the risks of investing in the Fund.
Performance Additional Market Index [Text] rr_PerformanceAdditionalMarketIndex The Bloomberg U.S. Agency Fixed Rate MBS Index is included as an additional index for the Fund as it shows how the Fund’s performance compares with the returns of an index of funds with similar investment objectives.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.PrincipalAM.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.
Bar Chart [Heading] rr_BarChartHeading Total Returns as of December 31
Bar Chart Does Not Reflect Sales Loads [Text] rr_BarChartDoesNotReflectSalesLoads These annual returns do not reflect sales charges on Class A shares; if they did, results would be lower.
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
Highest return for a quarter during the period of the bar chart above:Q4 20237.52 %
Lowest return for a quarter during the period of the bar chart above:Q3 2022(5.49)%
Performance Table Heading rr_PerformanceTableHeading Average Annual Total ReturnsFor the periods ended December 31, 2023
Performance Table Market Index Changed rr_PerformanceTableMarketIndexChanged Effective March 1, 2024, the Fund changed its primary broad-based index to the Bloomberg U.S. Aggregate Bond Index in order to meet the revised definition of “broad-based securities market index.”
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are shown for Class A shares only and would be different for the other share classes.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock
After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. After-tax returns are shown for Class A shares only and would be different for the other share classes.
Effective March 1, 2024, the Fund changed its primary broad-based index to the Bloomberg U.S. Aggregate Bond Index in order to meet the revised definition of “broad-based securities market index.” The Bloomberg U.S. Agency Fixed Rate MBS Index is included as an additional index for the Fund as it shows how the Fund’s performance compares with the returns of an index of funds with similar investment objectives.
PFI Prospectus | Government & High Quality Bond Fund | Risk Lose Money [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Many factors affect that value, and it is possible to lose money by investing in the Fund.
PFI Prospectus | Government & High Quality Bond Fund | Risk Not Insured Depository Institution [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
PFI Prospectus | Government & High Quality Bond Fund | Derivatives Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Derivatives Risk. Derivatives may not move in the direction anticipated by the portfolio manager. Transactions in derivatives may increase volatility, cause the liquidation of portfolio positions when not advantageous to do so, and result in disproportionate losses that may be substantially greater than a fund’s initial investment.
•Futures. Futures contracts involve specific risks, including: the imperfect correlation between the change in market value of the instruments held by the Fund and the price of the futures contract; possible lack of a liquid secondary market for a futures contract and the resulting inability to close a futures contract when desired; counterparty risk; and if the Fund has insufficient cash, it may have to sell securities from its portfolio to meet daily variation margin requirements.
PFI Prospectus | Government & High Quality Bond Fund | Derivatives Risk, Futures Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Futures. Futures contracts involve specific risks, including: the imperfect correlation between the change in market value of the instruments held by the Fund and the price of the futures contract; possible lack of a liquid secondary market for a futures contract and the resulting inability to close a futures contract when desired; counterparty risk; and if the Fund has insufficient cash, it may have to sell securities from its portfolio to meet daily variation margin requirements.
PFI Prospectus | Government & High Quality Bond Fund | Fixed-Income Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Fixed-Income Securities Risk. Fixed-income securities are subject to interest rate, credit quality, and liquidity risks. The market value of fixed-income securities generally declines when interest rates rise, and increased interest rates may adversely affect the liquidity of certain fixed-income securities. Moreover, an issuer of fixed-income securities could default on its payment obligations due to increased interest rates or for other reasons.
PFI Prospectus | Government & High Quality Bond Fund | High Portfolio Turnover Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock High Portfolio Turnover Risk. High portfolio turnover (more than 100%) caused by active and frequent trading of portfolio securities may result in accelerating the realization of taxable gains and losses, lower fund performance, and increased brokerage costs.
PFI Prospectus | Government & High Quality Bond Fund | Portfolio Duration Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Portfolio Duration Risk. Portfolio duration is a measure of the expected life of a fixed-income security and its sensitivity to changes in interest rates. The longer a fund’s average portfolio duration, the more sensitive the fund will be to changes in interest rates, which means funds with longer average portfolio durations may be more volatile than those with shorter durations.
PFI Prospectus | Government & High Quality Bond Fund | Real Estate Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Real Estate Securities Risk. Investing in real estate securities subjects the fund to the risks associated with the real estate market (which are similar to the risks associated with direct ownership in real estate), including declines in real estate values, loss due to casualty or condemnation, property taxes, interest rate changes, increased expenses, cash flow of underlying real estate assets, regulatory changes (including zoning, land use, and rents), and environmental problems, as well as to the risks related to the management skill and creditworthiness of the issuer.
PFI Prospectus | Government & High Quality Bond Fund | Redemption And Large Transaction Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Redemption and Large Transaction Risk. Ownership of the Fund’s shares may be concentrated in one or a few large investors (such as funds of funds, institutional investors, and asset allocation programs) that may redeem or purchase shares in large quantities. These transactions may cause the Fund to sell securities to meet redemptions or to invest additional cash at times it would not otherwise do so, which may result in increased transaction costs, increased expenses, changes to expense ratios, and adverse effects to Fund performance. Such transactions may also accelerate the realization of taxable income if sales of portfolio securities result in gains. Moreover, reallocations by large shareholders among share classes of a fund may result in changes to the expense ratios of affected classes, which may increase the expenses paid by shareholders of the class that experienced the redemption.
PFI Prospectus | Government & High Quality Bond Fund | Securitized Products Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Securitized Products Risk. Investments in securitized products are subject to risks similar to traditional fixed-income securities, such as credit, interest rate, liquidity, prepayment, extension, and default risk, as well as additional risks associated with the nature of the assets and the servicing of those assets. Unscheduled prepayments on securitized products may have to be reinvested at lower rates. A reduction in prepayments may increase the effective maturities of these securities, exposing them to the risk of decline in market value over time (extension risk). With respect to securities that are delivered in TBA transactions, there is a risk that the actual securities received by the Fund may be less favorable than what was anticipated when entering into the transaction.
PFI Prospectus | Government & High Quality Bond Fund | U.S. Government Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock U.S. Government Securities Risk. Yields available from U.S. government securities are generally lower than yields from many other fixed-income securities. The value of U.S. government securities may be adversely impacted by changes in interest rates, changes in the credit rating of the U.S. government, or a default by the U.S. government.
PFI Prospectus | Government & High Quality Bond Fund | U.S. Government-Sponsored Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock U.S. Government-Sponsored Securities Risk. Securities issued by U.S. government-sponsored enterprises such as the Federal Home Loan Mortgage Corporation, the Federal National Mortgage Association, and the Federal Home Loan Banks are not issued or guaranteed by the U.S. government.
PFI Prospectus | Government & High Quality Bond Fund | Bloomberg U.S. Aggregate Bond Index (reflects no deduction for fees, expenses, or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
Label rr_AverageAnnualReturnLabel Bloomberg U.S. Aggregate Bond Index (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 5.53%
5 Years rr_AverageAnnualReturnYear05 1.10%
10 Years rr_AverageAnnualReturnYear10 1.81%
PFI Prospectus | Government & High Quality Bond Fund | Bloomberg U.S. Agency Fixed Rate MBS Index (reflects no deduction for fees, expenses, or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
Label rr_AverageAnnualReturnLabel Bloomberg U.S. Agency Fixed Rate MBS Index (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 5.05%
5 Years rr_AverageAnnualReturnYear05 0.25%
10 Years rr_AverageAnnualReturnYear10 1.39%
PFI Prospectus | Government & High Quality Bond Fund | Class A  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol CMPGX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 2.25%
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.49%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.15%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.21%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.85%
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.85%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 310
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 490
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 686
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,250
Annual Return 2014 rr_AnnualReturn2014 4.79%
Annual Return 2015 rr_AnnualReturn2015 0.62%
Annual Return 2016 rr_AnnualReturn2016 1.41%
Annual Return 2017 rr_AnnualReturn2017 1.35%
Annual Return 2018 rr_AnnualReturn2018 0.51%
Annual Return 2019 rr_AnnualReturn2019 6.15%
Annual Return 2020 rr_AnnualReturn2020 2.49%
Annual Return 2021 rr_AnnualReturn2021 (1.80%)
Annual Return 2022 rr_AnnualReturn2022 (12.13%)
Annual Return 2023 rr_AnnualReturn2023 4.43%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Highest return for a quarter during the period of the bar chart above:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Dec. 31, 2023
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 7.52%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Lowest return for a quarter during the period of the bar chart above:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Sep. 30, 2022
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (5.49%)
Label rr_AverageAnnualReturnLabel Class A Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 2.12%
5 Years rr_AverageAnnualReturnYear05 (0.84%)
10 Years rr_AverageAnnualReturnYear10 0.43%
PFI Prospectus | Government & High Quality Bond Fund | Class A | After Taxes on Distributions  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Class A Return After Taxes on Distributions
1 Year rr_AverageAnnualReturnYear01 1.03%
5 Years rr_AverageAnnualReturnYear05 (1.62%)
10 Years rr_AverageAnnualReturnYear10 (0.62%)
PFI Prospectus | Government & High Quality Bond Fund | Class A | After Taxes on Distributions and Sales  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Class A Return After Taxes on Distributions and Sale of Fund Shares
1 Year rr_AverageAnnualReturnYear01 1.24%
5 Years rr_AverageAnnualReturnYear05 (0.95%)
10 Years rr_AverageAnnualReturnYear10 (0.11%)
PFI Prospectus | Government & High Quality Bond Fund | Class J  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PMRJX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.49%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.15%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.29%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.93%
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.93%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 195
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 296
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 515
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,143
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 95
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 296
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 515
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,143
Label rr_AverageAnnualReturnLabel Class J Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 3.47%
5 Years rr_AverageAnnualReturnYear05 (0.44%)
10 Years rr_AverageAnnualReturnYear10 0.63%
PFI Prospectus | Government & High Quality Bond Fund | Institutional Class  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PMRIX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.49%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.05%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.54%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.01%) [16]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.53%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 54
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 172
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 301
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 676
Label rr_AverageAnnualReturnLabel Institutional Class Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 4.87%
5 Years rr_AverageAnnualReturnYear05 (0.11%)
10 Years rr_AverageAnnualReturnYear10 0.95%
PFI Prospectus | Government & High Quality Bond Fund | Class R-1  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PMGRX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.49%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.35%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.54%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.38%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.09%) [16]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.29%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 131
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 428
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 747
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,650
Label rr_AverageAnnualReturnLabel Class R-1 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 3.96%
5 Years rr_AverageAnnualReturnYear05 (0.89%)
10 Years rr_AverageAnnualReturnYear10 0.17%
PFI Prospectus | Government & High Quality Bond Fund | Class R-3  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PRCMX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.49%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.33%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.07%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.09%) [16]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.98%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 100
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 331
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 581
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,298
Label rr_AverageAnnualReturnLabel Class R-3 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 4.39%
5 Years rr_AverageAnnualReturnYear05 (0.57%)
10 Years rr_AverageAnnualReturnYear10 0.49%
PFI Prospectus | Government & High Quality Bond Fund | Class R-4  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PMRDX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.49%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.10%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.29%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.88%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.09%) [16]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.79%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 81
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 272
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 479
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,076
Label rr_AverageAnnualReturnLabel Class R-4 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 4.59%
5 Years rr_AverageAnnualReturnYear05 (0.38%)
10 Years rr_AverageAnnualReturnYear10 0.68%
PFI Prospectus | Government & High Quality Bond Fund | Class R-5  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PMREX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.49%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.27%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.76%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.09%) [16]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.67%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 68
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 234
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 414
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 934
Label rr_AverageAnnualReturnLabel Class R-5 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 4.60%
5 Years rr_AverageAnnualReturnYear05 (0.26%)
10 Years rr_AverageAnnualReturnYear10 0.80%
PFI Prospectus | Government Money Market Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading GOVERNMENT MONEY MARKET FUND
Objective [Heading] rr_ObjectiveHeading Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The Fund seeks as high a level of current income as is considered consistent with preservation of principal and maintenance of liquidity.
Expense [Heading] rr_ExpenseHeading Fees and Expenses of the Fund
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock
This table describes the fees and expenses that you may pay if you buy, hold, and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below.
If you purchase Institutional Class or Class R-6 shares through certain programs offered by certain financial intermediaries, you may be required to pay a commission and/or other forms of compensation to the broker, or to your Financial Professional or other financial intermediary.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder Fees (fees paid directly from your investment):
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination February 28, 2025
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. The calculation of costs takes into account any applicable contractual fee waivers and/or expense reimbursements for the period noted in the table above. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock The Fund will invest at least 99.5% of its total assets in cash, government securities, and/or repurchase agreements that are collateralized fully by cash or government securities (government securities can include shares of other government money market funds). The Fund invests at least 80% of its net assets, plus any borrowings for investment purposes, in government securities and repurchase agreements that are collateralized by government securities. Specifically, the Fund will invest in U.S. treasury bills, bonds, and other obligations issued or guaranteed by the U.S. government or its agencies or instrumentalities (which will include instruments with variable or floating interest rates), as well as shares of other government money market funds. The Fund seeks to maintain a stable net asset value of $1.00 per share. The Fund maintains a dollar weighted average portfolio maturity of 60 days or less. As with all mutual funds, the value of the Fund’s assets may rise or fall.
Strategy Portfolio Concentration [Text] rr_StrategyPortfolioConcentration The Fund will invest at least 99.5% of its total assets in cash, government securities, and/or repurchase agreements that are collateralized fully by cash or government securities (government securities can include shares of other government money market funds).
Risk [Heading] rr_RiskHeading Principal Risks
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
The following information provides some indication of the risks of investing in the Fund. Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. You may get updated performance information at www.PrincipalAM.com.
The bar chart shows the investment returns of the Fund’s Institutional Class shares for each full calendar year of operations for 10 years (or, if shorter, the life of the Fund). The table shows for the last one, five, and ten calendar year periods (or, if shorter, the life of the Fund), how the Fund’s average annual total returns compare with those of one or more broad measures of market performance.
For periods prior to the inception date of Class R-6 shares (December 12, 2022), the performance shown in the table for Class R-6 shares is that of the Fund’s Institutional Class shares.
Life of Fund returns are measured from the date the Fund’s shares were first sold (December 20, 2017).
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following information provides some indication of the risks of investing in the Fund.
Performance Additional Market Index [Text] rr_PerformanceAdditionalMarketIndex The Bloomberg U.S. Treasury Bellwethers 3 Month Index is included as an additional index for the Fund as it shows how the Fund’s performance compares with the returns of an index of funds with similar investment objectives.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.PrincipalAM.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.
Bar Chart [Heading] rr_BarChartHeading Total Returns as of December 31
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
Highest return for a quarter during the period of the bar chart above:Q4 20231.32 %
Lowest return for a quarter during the period of the bar chart above:Q1 20220.00 %
Performance Table Heading rr_PerformanceTableHeading Average Annual Total ReturnsFor the periods ended December 31, 2023
Performance Table Market Index Changed rr_PerformanceTableMarketIndexChanged Effective March 1, 2024, the Fund changed its primary broad-based index to the Bloomberg U.S. Aggregate Bond Index in order to meet the revised definition of “broad-based securities market index.”
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock
Effective March 1, 2024, the Fund changed its primary broad-based index to the Bloomberg U.S. Aggregate Bond Index in order to meet the revised definition of “broad-based securities market index.” The Bloomberg U.S. Treasury Bellwethers 3 Month Index is included as an additional index for the Fund as it shows how the Fund’s performance compares with the returns of an index of funds with similar investment objectives.
PFI Prospectus | Government Money Market Fund | Risk Lose Money [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock You could lose money by investing in the Fund.
PFI Prospectus | Government Money Market Fund | Risk Not Insured Depository Institution [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock An investment in the Fund is not a bank account and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
PFI Prospectus | Government Money Market Fund | Counterparty Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Counterparty Risk. Counterparty risk is the risk that the counterparty to a contract or other obligation will be unable or unwilling to honor its obligations.
PFI Prospectus | Government Money Market Fund | Fixed-Income Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Fixed-Income Securities Risk. Fixed-income securities are subject to interest rate, credit quality, and liquidity risks. The market value of fixed-income securities generally declines when interest rates rise, and increased interest rates may adversely affect the liquidity of certain fixed-income securities. Moreover, an issuer of fixed-income securities could default on its payment obligations due to increased interest rates or for other reasons.
PFI Prospectus | Government Money Market Fund | Floating And Variable Rate Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Floating and Variable Rate Securities Risk. The market prices of securities with variable and floating interest rates are generally less sensitive to interest rate changes than are the market prices of securities of fixed interest rates. Floating and variable rate securities may decline in value if market interest rates or interest rates paid by them do not move as expected. Floating and variable rate securities may be subject to greater liquidity risk than other debt securities, meaning that there may be limitations on the Fund’s ability to sell the securities at any given time.
PFI Prospectus | Government Money Market Fund | Investment Company Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Investment Company Securities Risk. A fund that invests in another investment company (for example, another fund or an exchange-traded fund (or ETF)) is subject to the risks associated with direct ownership of the securities in which such investment company invests. Fund shareholders indirectly bear their proportionate share of the expenses of each such investment company.
PFI Prospectus | Government Money Market Fund | Redemption And Large Transaction Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Redemption and Large Transaction Risk. Ownership of the Fund’s shares may be concentrated in one or a few large investors (such as funds of funds, institutional investors, and asset allocation programs) that may redeem or purchase shares in large quantities. These transactions may cause the Fund to sell securities to meet redemptions or to invest additional cash at times it would not otherwise do so, which may result in increased transaction costs, increased expenses, changes to expense ratios, and adverse effects to Fund performance. Such transactions may also accelerate the realization of taxable income if sales of portfolio securities result in gains. Moreover, reallocations by large shareholders among share classes of a fund may result in changes to the expense ratios of affected classes, which may increase the expenses paid by shareholders of the class that experienced the redemption.
PFI Prospectus | Government Money Market Fund | Repurchase Agreement Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Repurchase Agreement Risk. If the other party to a repurchase agreement defaults on its obligation under the agreement, the Fund may suffer delays and incur costs or lose money in exercising its rights under the agreement. If the seller fails to repurchase the security and the market value of the security declines, the Fund may lose money.
PFI Prospectus | Government Money Market Fund | U.S. Government Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock U.S. Government Securities Risk. Yields available from U.S. government securities are generally lower than yields from many other fixed-income securities. The value of U.S. government securities may be adversely impacted by changes in interest rates, changes in the credit rating of the U.S. government, or a default by the U.S. government.
PFI Prospectus | Government Money Market Fund | U.S. Government-Sponsored Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock U.S. Government-Sponsored Securities Risk. Securities issued by U.S. government-sponsored enterprises such as the Federal Home Loan Mortgage Corporation, the Federal National Mortgage Association, and the Federal Home Loan Banks are not issued or guaranteed by the U.S. government.
PFI Prospectus | Government Money Market Fund | Bloomberg U.S. Aggregate Bond Index (reflects no deduction for fees, expenses, or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
Label rr_AverageAnnualReturnLabel Bloomberg U.S. Aggregate Bond Index (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 5.53%
5 Years rr_AverageAnnualReturnYear05 1.10%
Since Inception rr_AverageAnnualReturnSinceInception 0.99%
PFI Prospectus | Government Money Market Fund | Bloomberg U.S. Treasury Bellwethers 3 Month Index (reflects no deduction for fees, expenses, or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
Label rr_AverageAnnualReturnLabel Bloomberg U.S. Treasury Bellwethers 3 Month Index (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 5.15%
5 Years rr_AverageAnnualReturnYear05 1.92%
Since Inception rr_AverageAnnualReturnSinceInception 1.91%
PFI Prospectus | Government Money Market Fund | Institutional Class  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PGVXX
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.15%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.01%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.17%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.01%) [17],[18]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.16%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 16
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 54
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 95
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 216
Annual Return 2018 rr_AnnualReturn2018 1.70%
Annual Return 2019 rr_AnnualReturn2019 2.06%
Annual Return 2020 rr_AnnualReturn2020 0.34%
Annual Return 2021 rr_AnnualReturn2021 none
Annual Return 2022 rr_AnnualReturn2022 1.45%
Annual Return 2023 rr_AnnualReturn2023 4.97%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Highest return for a quarter during the period of the bar chart above:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Dec. 31, 2023
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 1.32%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Lowest return for a quarter during the period of the bar chart above:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2022
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn none
Label rr_AverageAnnualReturnLabel Institutional Class Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 4.97%
5 Years rr_AverageAnnualReturnYear05 1.75%
Since Inception rr_AverageAnnualReturnSinceInception 1.74%
PFI Prospectus | Government Money Market Fund | Class R-6  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PGWXX
Shareholder Fee, Other rr_ShareholderFeeOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.15%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.01%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.17%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.02%) [17],[18]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.15%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 15
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 53
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 94
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 215
Label rr_AverageAnnualReturnLabel Class R-6 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 5.03%
5 Years rr_AverageAnnualReturnYear05 1.76%
Since Inception rr_AverageAnnualReturnSinceInception 1.75%
PFI Prospectus | High Income Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading HIGH INCOME FUND
Objective [Heading] rr_ObjectiveHeading Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock
The Fund seeks high current income.
Expense [Heading] rr_ExpenseHeading Fees and Expenses of the Fund
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock
This table describes the fees and expenses that you may pay if you buy, hold, and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below.
If you purchase Institutional Class shares through certain programs offered by certain financial intermediaries, you may be required to pay a commission and/or other forms of compensation to the broker, or to your Financial Professional or other financial intermediary.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder Fees (fees paid directly from your investment):
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination February 28, 2025
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock
The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in Annual Fund Operating Expenses or in the Example, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 35.0% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 35.00%
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. The calculation of costs takes into account any applicable contractual fee waivers and/or expense reimbursements for the period noted in the table above. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
Under normal circumstances, the Fund invests primarily in below investment grade bonds and bank loans (sometimes called “high yield” or “junk”), which are rated, at the time of purchase, Ba1 or lower by Moody’s Investors Service, Inc. (“Moody’s”) and BB+ or lower by S&P Global Ratings (“S&P Global”). If the bond or bank loan has been rated by only one of the rating agencies, that rating will determine the rating of the bond or bank loan; if the bond or bank loan is rated differently by the rating agencies, the highest rating will be used; and if the bond or bank loan has not been rated by either of the rating agencies, those selecting such investments will determine the quality of the bond or bank loan. The Fund also invests in investment grade bank loans (also known as senior floating rate interests) and securities of foreign issuers.
In managing the Fund, Principal Global Investors, LLC (“PGI”), the Fund’s investment advisor, allocates the Fund’s assets among multiple sub-advisors that use differing approaches in making their investment decisions, which include actively managed and more passive investment strategies. With respect to the passive strategy, the Fund uses a sampling methodology to purchase securities with generally the same risk and return characteristics as the Bloomberg U.S. Corporate High Yield 2% Issuer Capped Index (the “Index”) in an attempt to match or exceed the performance of the Index.
Under normal circumstances, the Fund maintains an average portfolio duration that is within ±25% of the duration of the Index, which as of January 31, 2024 was 3.33 years. The Fund is not managed to a particular maturity.
Strategy Portfolio Concentration [Text] rr_StrategyPortfolioConcentration Under normal circumstances, the Fund maintains an average portfolio duration that is within ±25% of the duration of the Index, which as of January 31, 2024 was 3.33 years. The Fund is not managed to a particular maturity.
Risk [Heading] rr_RiskHeading Principal Risks
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
The following information provides some indication of the risks of investing in the Fund. Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. You may get updated performance information at www.PrincipalAM.com.
The bar chart shows the investment returns of the Fund’s Institutional Class shares for each full calendar year of operations for 10 years (or, if shorter, the life of the Fund). The table shows for the last one, five, and ten calendar year periods (or, if shorter, the life of the Fund), how the Fund’s average annual total returns compare with those of one or more broad measures of market performance.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following information provides some indication of the risks of investing in the Fund.
Performance Additional Market Index [Text] rr_PerformanceAdditionalMarketIndex The Bloomberg U.S. Corporate High Yield 2% Issuer Capped Index is included as an additional index for the Fund as it shows how the Fund’s performance compares with the returns of an index of funds with similar investment objectives.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.PrincipalAM.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.
Bar Chart [Heading] rr_BarChartHeading Total Returns as of December 31
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
Highest return for a quarter during the period of the bar chart above:Q2 20208.47 %
Lowest return for a quarter during the period of the bar chart above:Q1 2020(12.72)%
Performance Table Heading rr_PerformanceTableHeading Average Annual Total ReturnsFor the periods ended December 31, 2023
Performance Table Market Index Changed rr_PerformanceTableMarketIndexChanged Effective March 1, 2024, the Fund changed its primary broad-based index to the Bloomberg U.S. Aggregate Bond Index in order to meet the revised definition of “broad-based securities market index.”
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock
After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts.
Effective March 1, 2024, the Fund changed its primary broad-based index to the Bloomberg U.S. Aggregate Bond Index in order to meet the revised definition of “broad-based securities market index.” The Bloomberg U.S. Corporate High Yield 2% Issuer Capped Index is included as an additional index for the Fund as it shows how the Fund’s performance compares with the returns of an index of funds with similar investment objectives.
PFI Prospectus | High Income Fund | Risk Lose Money [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Many factors affect that value, and it is possible to lose money by investing in the Fund.
PFI Prospectus | High Income Fund | Risk Not Insured Depository Institution [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
PFI Prospectus | High Income Fund | Bank Loans Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Bank Loans Risk. Changes in economic conditions are likely to cause issuers of bank loans (also known as senior floating rate interests) to be unable to meet their obligations. In addition, the value of the collateral securing the loan (if any) may decline, causing a loan to be substantially unsecured. Underlying credit agreements governing the bank loans, reliance on market makers, priority of repayment, and overall market volatility may harm the liquidity of loans.
PFI Prospectus | High Income Fund | Counterparty Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Counterparty Risk. Counterparty risk is the risk that the counterparty to a contract or other obligation will be unable or unwilling to honor its obligations.
PFI Prospectus | High Income Fund | Fixed-Income Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Fixed-Income Securities Risk. Fixed-income securities are subject to interest rate, credit quality, and liquidity risks. The market value of fixed-income securities generally declines when interest rates rise, and increased interest rates may adversely affect the liquidity of certain fixed-income securities. Moreover, an issuer of fixed-income securities could default on its payment obligations due to increased interest rates or for other reasons.
PFI Prospectus | High Income Fund | Foreign Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Foreign Securities Risk. The risks of foreign securities include loss of value as a result of: political or economic instability; nationalization, expropriation, or confiscatory taxation; settlement delays; and limited government regulation (including less stringent reporting, accounting, and disclosure standards than are required of U.S. companies).
PFI Prospectus | High Income Fund | High Yield Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock High Yield Securities Risk. High yield fixed-income securities (commonly referred to as “junk bonds”) are subject to greater credit quality risk than higher rated fixed-income securities and should be considered speculative.
PFI Prospectus | High Income Fund | Leverage Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Leverage Risk. Leverage created by borrowing or certain types of transactions or investments may impair the fund’s liquidity, cause it to liquidate positions at an unfavorable time, increase volatility of the fund’s net asset value, or diminish the fund’s performance.
PFI Prospectus | High Income Fund | Portfolio Duration Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Portfolio Duration Risk. Portfolio duration is a measure of the expected life of a fixed-income security and its sensitivity to changes in interest rates. The longer a fund’s average portfolio duration, the more sensitive the fund will be to changes in interest rates, which means funds with longer average portfolio durations may be more volatile than those with shorter durations.
PFI Prospectus | High Income Fund | Redemption And Large Transaction Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Redemption and Large Transaction Risk. Ownership of the Fund’s shares may be concentrated in one or a few large investors (such as funds of funds, institutional investors, and asset allocation programs) that may redeem or purchase shares in large quantities. These transactions may cause the Fund to sell securities to meet redemptions or to invest additional cash at times it would not otherwise do so, which may result in increased transaction costs, increased expenses, changes to expense ratios, and adverse effects to Fund performance. Such transactions may also accelerate the realization of taxable income if sales of portfolio securities result in gains. Moreover, reallocations by large shareholders among share classes of a fund may result in changes to the expense ratios of affected classes, which may increase the expenses paid by shareholders of the class that experienced the redemption.
PFI Prospectus | High Income Fund | Bloomberg U.S. Aggregate Bond Index (reflects no deduction for fees, expenses, or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
Label rr_AverageAnnualReturnLabel Bloomberg U.S. Aggregate Bond Index (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 5.53%
5 Years rr_AverageAnnualReturnYear05 1.10%
10 Years rr_AverageAnnualReturnYear10 1.81%
PFI Prospectus | High Income Fund | Bloomberg U.S. Corporate High Yield 2% Issuer Capped Index (reflects no deduction for fees, expenses, or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
Label rr_AverageAnnualReturnLabel Bloomberg U.S. Corporate High Yield 2% Issuer Capped Index (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 13.44%
5 Years rr_AverageAnnualReturnYear05 5.35%
10 Years rr_AverageAnnualReturnYear10 4.59%
PFI Prospectus | High Income Fund | Institutional Class  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PYHIX
Shareholder Fee, Other rr_ShareholderFeeOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.61%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.02%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.63%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.02%) [19]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.61%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 62
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 200
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 349
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 784
Annual Return 2014 rr_AnnualReturn2014 2.31%
Annual Return 2015 rr_AnnualReturn2015 (4.72%)
Annual Return 2016 rr_AnnualReturn2016 14.01%
Annual Return 2017 rr_AnnualReturn2017 5.77%
Annual Return 2018 rr_AnnualReturn2018 (2.72%)
Annual Return 2019 rr_AnnualReturn2019 11.73%
Annual Return 2020 rr_AnnualReturn2020 5.42%
Annual Return 2021 rr_AnnualReturn2021 5.04%
Annual Return 2022 rr_AnnualReturn2022 (10.97%)
Annual Return 2023 rr_AnnualReturn2023 13.02%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Highest return for a quarter during the period of the bar chart above:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 8.47%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Lowest return for a quarter during the period of the bar chart above:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (12.72%)
Label rr_AverageAnnualReturnLabel Institutional Class Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 13.02%
5 Years rr_AverageAnnualReturnYear05 4.48%
10 Years rr_AverageAnnualReturnYear10 3.59%
PFI Prospectus | High Income Fund | Institutional Class | After Taxes on Distributions  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Institutional Class Return After Taxes on Distributions
1 Year rr_AverageAnnualReturnYear01 9.73%
5 Years rr_AverageAnnualReturnYear05 1.85%
10 Years rr_AverageAnnualReturnYear10 1.05%
PFI Prospectus | High Income Fund | Institutional Class | After Taxes on Distributions and Sales  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Institutional Class Return After Taxes on Distributions and Sale of Fund Shares
1 Year rr_AverageAnnualReturnYear01 7.58%
5 Years rr_AverageAnnualReturnYear05 2.29%
10 Years rr_AverageAnnualReturnYear10 1.60%
PFI Prospectus | High Yield Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading HIGH YIELD FUND
Objective [Heading] rr_ObjectiveHeading Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The Fund seeks to provide a high level of current income.
Expense [Heading] rr_ExpenseHeading Fees and Expenses of the Fund
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock
This table describes the fees and expenses that you may pay if you buy, hold, and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $100,000 in Class A Shares of Principal Funds, Inc. More information about these and other discounts is available from your financial intermediary and in “Choosing a Share Class and The Costs of Investing” beginning on page 426 of the Fund’s Prospectus, Appendix B to the Prospectus titled “Intermediary-Specific Sales Charge Waivers and Reductions,” and “Multiple Class Structure” beginning on page 70 of the Fund’s Statement of Additional Information.
If you purchase Institutional Class or Class R-6 shares through certain programs offered by certain financial intermediaries, you may be required to pay a commission and/or other forms of compensation to the broker, or to your Financial Professional or other financial intermediary.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder Fees (fees paid directly from your investment)
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination February 28, 2025
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock
The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in Annual Fund Operating Expenses or in the Example, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 28.0% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 28.00%
Expense Breakpoint Discounts [Text] rr_ExpenseBreakpointDiscounts You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $100,000 in Class A Shares of Principal Funds, Inc.
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 100,000
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example assumes conversion of the Class C shares to Class A shares after the eighth year. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. The calculation of costs takes into account any applicable contractual fee waivers and/or expense reimbursements for the period noted in the table above. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, No Redemption, By Year, Caption [Text] rr_ExpenseExampleNoRedemptionByYearCaption With respect to Class C shares, you would pay the following expenses if you did not redeem your shares (all other classes would be the same as in the above example):
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock Under normal circumstances, the Fund invests at least 80% of its net assets, plus any borrowings for investment purposes, in below investment grade bonds and bank loans (sometimes called “high yield” or “junk”), which are rated, at the time of purchase, Ba1 or lower by Moody’s Investors Service, Inc. (“Moody’s”) and BB+ or lower by S&P Global Ratings (“S&P Global”). If the bond or bank loan has been rated by only one of the rating agencies, that rating will determine the rating of the bond or bank loan; if the bond or bank loan is rated differently by the rating agencies, the highest rating will be used; and if the bond or bank loan has not been rated by either of those agencies, those selecting such investments will determine the quality of the bond or bank loan. The Fund also invests in investment grade bank loans (also known as senior floating rate interests) and securities of foreign issuers. Under normal circumstances, the Fund maintains an average portfolio duration that is within ±20% of the duration of the Bloomberg U.S. Corporate High Yield 2% Issuer Capped Index, which as of January 31, 2024 was 3.33 years. The Fund is not managed to a particular maturity.
Strategy Portfolio Concentration [Text] rr_StrategyPortfolioConcentration Under normal circumstances, the Fund maintains an average portfolio duration that is within ±20% of the duration of the Bloomberg U.S. Corporate High Yield 2% Issuer Capped Index, which as of January 31, 2024 was 3.33 years. The Fund is not managed to a particular maturity.
Risk [Heading] rr_RiskHeading Principal Risks
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
The following information provides some indication of the risks of investing in the Fund. Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. You may get updated performance information at www.PrincipalAM.com.
The bar chart shows the investment returns of the Fund’s Class A shares for each full calendar year of operations for 10 years (or, if shorter, the life of the Fund). These annual returns do not reflect sales charges on Class A shares; if they did, results would be lower. The table shows for the last one, five, and ten calendar year periods (or, if shorter, the life of the Fund), how the Fund’s average annual total returns compare with those of one or more broad measures of market performance.
For periods prior to the inception date of Class R-6 shares (November 22, 2016), the performance shown in the table for Class R-6 shares is that of the Fund’s Class A shares, adjusted to reflect the fees and expenses of Class R-6 shares. However, where the adjustment for fees and expenses results in performance for Class R-6 shares that is higher than the historical performance of the Class A shares, the historical performance of the Class A shares is used (without respect to sales charges, which are not applicable to Class R-6). These adjustments result in performance for such periods that is no higher than the historical performance of the Class A shares.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following information provides some indication of the risks of investing in the Fund.
Performance Additional Market Index [Text] rr_PerformanceAdditionalMarketIndex The Bloomberg U.S. Corporate High Yield 2% Issuer Capped Index is included as an additional index for the Fund as it shows how the Fund’s performance compares with the returns of an index of funds with similar investment objectives.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.PrincipalAM.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture . Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.
Bar Chart [Heading] rr_BarChartHeading Total Returns as of December 31
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
Highest return for a quarter during the period of the bar chart above:
Q2 20208.73 %
Lowest return for a quarter during the period of the bar chart above:
Q1 2020(12.01)%
Performance Table Heading rr_PerformanceTableHeading Average Annual Total ReturnsFor the periods ended December 31, 2023
Performance Table Market Index Changed rr_PerformanceTableMarketIndexChanged Effective March 1, 2024, the Fund changed its primary broad-based index to the Bloomberg U.S. Aggregate Bond Index in order to meet the revised definition of “broad-based securities market index.”
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are shown for Class A shares only and would be different for the other share classes.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock
After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. After-tax returns are shown for Class A shares only and would be different for the other share classes.
Effective March 1, 2024, the Fund changed its primary broad-based index to the Bloomberg U.S. Aggregate Bond Index in order to meet the revised definition of “broad-based securities market index.” The Bloomberg U.S. Corporate High Yield 2% Issuer Capped Index is included as an additional index for the Fund as it shows how the Fund’s performance compares with the returns of an index of funds with similar investment objectives.
PFI Prospectus | High Yield Fund | Risk Lose Money [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Many factors affect that value, and it is possible to lose money by investing in the Fund.
PFI Prospectus | High Yield Fund | Risk Not Insured Depository Institution [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
PFI Prospectus | High Yield Fund | Bank Loans Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Bank Loans Risk. Changes in economic conditions are likely to cause issuers of bank loans (also known as senior floating rate interests) to be unable to meet their obligations. In addition, the value of the collateral securing the loan (if any) may decline, causing a loan to be substantially unsecured. Underlying credit agreements governing the bank loans, reliance on market makers, priority of repayment, and overall market volatility may harm the liquidity of loans.
PFI Prospectus | High Yield Fund | Fixed-Income Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Fixed-Income Securities Risk. Fixed-income securities are subject to interest rate, credit quality, and liquidity risks. The market value of fixed-income securities generally declines when interest rates rise, and increased interest rates may adversely affect the liquidity of certain fixed-income securities. Moreover, an issuer of fixed-income securities could default on its payment obligations due to increased interest rates or for other reasons.
PFI Prospectus | High Yield Fund | Foreign Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Foreign Securities Risk. The risks of foreign securities include loss of value as a result of: political or economic instability; nationalization, expropriation, or confiscatory taxation; settlement delays; and limited government regulation (including less stringent reporting, accounting, and disclosure standards than are required of U.S. companies).
PFI Prospectus | High Yield Fund | High Yield Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock High Yield Securities Risk. High yield fixed-income securities (commonly referred to as “junk bonds”) are subject to greater credit quality risk than higher rated fixed-income securities and should be considered speculative.
PFI Prospectus | High Yield Fund | Portfolio Duration Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Portfolio Duration Risk. Portfolio duration is a measure of the expected life of a fixed-income security and its sensitivity to changes in interest rates. The longer a fund’s average portfolio duration, the more sensitive the fund will be to changes in interest rates, which means funds with longer average portfolio durations may be more volatile than those with shorter durations.
PFI Prospectus | High Yield Fund | Redemption And Large Transaction Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Redemption and Large Transaction Risk. Ownership of the Fund’s shares may be concentrated in one or a few large investors (such as funds of funds, institutional investors, and asset allocation programs) that may redeem or purchase shares in large quantities. These transactions may cause the Fund to sell securities to meet redemptions or to invest additional cash at times it would not otherwise do so, which may result in increased transaction costs, increased expenses, changes to expense ratios, and adverse effects to Fund performance. Such transactions may also accelerate the realization of taxable income if sales of portfolio securities result in gains. Moreover, reallocations by large shareholders among share classes of a fund may result in changes to the expense ratios of affected classes, which may increase the expenses paid by shareholders of the class that experienced the redemption.
PFI Prospectus | High Yield Fund | Bloomberg U.S. Aggregate Bond Index (reflects no deduction for fees, expenses, or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
Label rr_AverageAnnualReturnLabel Bloomberg U.S. Aggregate Bond Index (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 5.53%
5 Years rr_AverageAnnualReturnYear05 1.10%
10 Years rr_AverageAnnualReturnYear10 1.81%
PFI Prospectus | High Yield Fund | Bloomberg U.S. Corporate High Yield 2% Issuer Capped Index (reflects no deduction for fees, expenses, or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
Label rr_AverageAnnualReturnLabel Bloomberg U.S. Corporate High Yield 2% Issuer Capped Index (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 13.44%
5 Years rr_AverageAnnualReturnYear05 5.35%
10 Years rr_AverageAnnualReturnYear10 4.59%
PFI Prospectus | High Yield Fund | Class A  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol CPHYX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 3.75%
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.51%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.18%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.94%
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.94%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 467
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 663
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 876
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,486
Annual Return 2014 rr_AnnualReturn2014 2.11%
Annual Return 2015 rr_AnnualReturn2015 (2.92%)
Annual Return 2016 rr_AnnualReturn2016 14.62%
Annual Return 2017 rr_AnnualReturn2017 7.76%
Annual Return 2018 rr_AnnualReturn2018 (4.79%)
Annual Return 2019 rr_AnnualReturn2019 13.30%
Annual Return 2020 rr_AnnualReturn2020 6.08%
Annual Return 2021 rr_AnnualReturn2021 5.39%
Annual Return 2022 rr_AnnualReturn2022 (8.55%)
Annual Return 2023 rr_AnnualReturn2023 12.37%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Highest return for a quarter during the period of the bar chart above:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 8.73%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Lowest return for a quarter during the period of the bar chart above:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (12.01%)
Label rr_AverageAnnualReturnLabel Class A Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 8.12%
5 Years rr_AverageAnnualReturnYear05 4.62%
10 Years rr_AverageAnnualReturnYear10 3.86%
PFI Prospectus | High Yield Fund | Class A | After Taxes on Distributions  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Class A Return After Taxes on Distributions
1 Year rr_AverageAnnualReturnYear01 5.59%
5 Years rr_AverageAnnualReturnYear05 2.40%
10 Years rr_AverageAnnualReturnYear10 1.50%
PFI Prospectus | High Yield Fund | Class A | After Taxes on Distributions and Sales  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Class A Return After Taxes on Distributions and Sale of Fund Shares
1 Year rr_AverageAnnualReturnYear01 4.73%
5 Years rr_AverageAnnualReturnYear05 2.58%
10 Years rr_AverageAnnualReturnYear10 1.87%
PFI Prospectus | High Yield Fund | Class C  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol CCHIX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.51%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.24%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.75%
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.75%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 278
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 551
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 949
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,848
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 178
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 551
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 949
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,848
Label rr_AverageAnnualReturnLabel Class C Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 10.46%
5 Years rr_AverageAnnualReturnYear05 4.61%
10 Years rr_AverageAnnualReturnYear10 3.64%
PFI Prospectus | High Yield Fund | Institutional Class  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PHYTX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.51%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.14%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.65%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.04%) [20]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.61%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 62
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 204
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 358
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 807
Label rr_AverageAnnualReturnLabel Institutional Class Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 12.86%
5 Years rr_AverageAnnualReturnYear05 5.76%
10 Years rr_AverageAnnualReturnYear10 4.58%
PFI Prospectus | High Yield Fund | Class R-6  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PHYFX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.51%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.02%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.53%
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.53%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 54
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 170
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 296
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 665
Label rr_AverageAnnualReturnLabel Class R-6 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 12.79%
5 Years rr_AverageAnnualReturnYear05 5.82%
10 Years rr_AverageAnnualReturnYear10 4.54%
PFI Prospectus | Inflation Protection Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading INFLATION PROTECTION FUND
Objective [Heading] rr_ObjectiveHeading Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The Fund seeks to provide current income and real (after inflation) total returns.
Expense [Heading] rr_ExpenseHeading Fees and Expenses of the Fund
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock
This table describes the fees and expenses that you may pay if you buy, hold, and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below.
If you purchase Institutional Class shares through certain programs offered by certain financial intermediaries, you may be required to pay a commission and/or other forms of compensation to the broker, or to your Financial Professional or other financial intermediary.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder Fees (fees paid directly from your investment)
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in Annual Fund Operating Expenses or in the Example, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 106.3% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 106.30%
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, No Redemption, By Year, Caption [Text] rr_ExpenseExampleNoRedemptionByYearCaption With respect to Class J shares, you would pay the following expenses if you did not redeem your shares (all other classes would be the same as in the above example):
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
The Fund invests primarily in inflation-indexed bonds of varying maturities issued by the U.S. and non-U.S. governments, their agencies, or instrumentalities, and U.S. and non-U.S. corporations. Inflation-indexed bonds are fixed-income securities that are structured to provide protection against inflation. The value of the bond’s principal or the interest income paid on the bond is adjusted to track changes in an official inflation measure. The U.S. Treasury uses the Consumer Price Index for Urban Consumers as the inflation measure. Inflation-indexed bonds issued by a foreign government are generally adjusted to reflect a comparable inflation index, calculated by that government. The Fund also invests in foreign securities, U.S. Treasuries, and agency securities. The Fund utilizes derivative strategies (specifically, futures, swaps, and options) for purposes of managing the risk profile of the Fund. A derivative is a financial arrangement, the value of which is derived from, or based on, a traditional security, asset, or market index.
Under normal circumstances, the Fund maintains an average portfolio duration that is within ±20% of the duration of the Bloomberg U.S. Treasury Inflation Protected Securities (“TIPS”) Index, which as of January 31, 2024 was 6.76 years. The Fund is not managed to a particular maturity. The Fund’s strategies may result in the active and frequent trading of the Fund’s portfolio securities.
Strategy Portfolio Concentration [Text] rr_StrategyPortfolioConcentration Under normal circumstances, the Fund maintains an average portfolio duration that is within ±20% of the duration of the Bloomberg U.S. Treasury Inflation Protected Securities (“TIPS”) Index, which as of January 31, 2024 was 6.76 years. The Fund is not managed to a particular maturity. The Fund’s strategies may result in the active and frequent trading of the Fund’s portfolio securities.
Risk [Heading] rr_RiskHeading Principal Risks
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
The following information provides some indication of the risks of investing in the Fund. Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. You may get updated performance information at www.PrincipalAM.com.
The bar chart shows the investment returns of the Fund’s Institutional Class shares for each full calendar year of operations for 10 years (or, if shorter, the life of the Fund). The table shows for the last one, five, and ten calendar year periods (or, if shorter, the life of the Fund), how the Fund’s average annual total returns compare with those of one or more broad measures of market performance.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following information provides some indication of the risks of investing in the Fund.
Performance Additional Market Index [Text] rr_PerformanceAdditionalMarketIndex The Bloomberg U.S. Treasury TIPS Index is included as an additional index for the Fund as it shows how the Fund’s performance compares with the returns of an index of funds with similar investment objectives.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.PrincipalAM.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. Y
Bar Chart [Heading] rr_BarChartHeading Total Returns as of December 31
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
Highest return for a quarter during the period of the bar chart above:
Q2 20204.72 %
Lowest return for a quarter during the period of the bar chart above:
Q2 2022(6.33)%
Performance Table Heading rr_PerformanceTableHeading Average Annual Total ReturnsFor the periods ended December 31, 2023
Performance Table Market Index Changed rr_PerformanceTableMarketIndexChanged Effective March 1, 2024, the Fund changed its primary broad-based index to the Bloomberg U.S. Aggregate Bond Index in order to meet the revised definition of “broad-based securities market index.”
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are shown for Institutional Class shares only and would be different for the other share classes.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock
After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. After-tax returns are shown for Institutional Class shares only and would be different for the other share classes.
Effective March 1, 2024, the Fund changed its primary broad-based index to the Bloomberg U.S. Aggregate Bond Index in order to meet the revised definition of “broad-based securities market index.” The Bloomberg U.S. Treasury TIPS Index is included as an additional index for the Fund as it shows how the Fund’s performance compares with the returns of an index of funds with similar investment objectives.
PFI Prospectus | Inflation Protection Fund | Risk Lose Money [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Many factors affect that value, and it is possible to lose money by investing in the Fund.
PFI Prospectus | Inflation Protection Fund | Risk Not Insured Depository Institution [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
PFI Prospectus | Inflation Protection Fund | Counterparty Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Counterparty Risk. Counterparty risk is the risk that the counterparty to a contract or other obligation will be unable or unwilling to honor its obligations.
PFI Prospectus | Inflation Protection Fund | Derivatives Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Derivatives Risk. Derivatives may not move in the direction anticipated by the portfolio manager. Transactions in derivatives may increase volatility, cause the liquidation of portfolio positions when not advantageous to do so, and result in disproportionate losses that may be substantially greater than a fund’s initial investment.
•Futures and Swaps. These derivative instruments involve specific risks, including: the imperfect correlation between the change in market value of the instruments held by the fund and the price of the instruments; possible lack of a liquid secondary market for an instrument and the resulting inability to close it when desired; counterparty risk; and if the fund has insufficient cash, it may have to sell securities from its portfolio to meet any applicable daily variation margin requirements.
•Options. Options involve specific risks, including: the imperfect correlation between the change in market value of the instruments held by the Fund and the price of the options; counterparty risk; difference in trading hours for the options markets and the markets for the underlying securities (rate movements can take place in the underlying markets that cannot be reflected in the options markets); and an insufficient liquid secondary market for particular options.
PFI Prospectus | Inflation Protection Fund | Derivatives Risk, Forward Contracts, Futures, And Swaps Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Futures and Swaps. These derivative instruments involve specific risks, including: the imperfect correlation between the change in market value of the instruments held by the fund and the price of the instruments; possible lack of a liquid secondary market for an instrument and the resulting inability to close it when desired; counterparty risk; and if the fund has insufficient cash, it may have to sell securities from its portfolio to meet any applicable daily variation margin requirements.
PFI Prospectus | Inflation Protection Fund | Derivatives Risk, Options Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Options. Options involve specific risks, including: the imperfect correlation between the change in market value of the instruments held by the Fund and the price of the options; counterparty risk; difference in trading hours for the options markets and the markets for the underlying securities (rate movements can take place in the underlying markets that cannot be reflected in the options markets); and an insufficient liquid secondary market for particular options.
PFI Prospectus | Inflation Protection Fund | Fixed-Income Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Fixed-Income Securities Risk. Fixed-income securities are subject to interest rate, credit quality, and liquidity risks. The market value of fixed-income securities generally declines when interest rates rise, and increased interest rates may adversely affect the liquidity of certain fixed-income securities. Moreover, an issuer of fixed-income securities could default on its payment obligations due to increased interest rates or for other reasons.
PFI Prospectus | Inflation Protection Fund | Foreign Currency Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Foreign Currency Risk. Risks of investing in securities denominated in, or that trade in, foreign (non-U.S.) currencies include changes in foreign exchange rates and foreign exchange restrictions.
PFI Prospectus | Inflation Protection Fund | Foreign Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Foreign Securities Risk. The risks of foreign securities include loss of value as a result of: political or economic instability; nationalization, expropriation, or confiscatory taxation; settlement delays; and limited government regulation (including less stringent reporting, accounting, and disclosure standards than are required of U.S. companies).
PFI Prospectus | Inflation Protection Fund | High Portfolio Turnover Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock High Portfolio Turnover Risk. High portfolio turnover (more than 100%) caused by active and frequent trading of portfolio securities may result in accelerating the realization of taxable gains and losses, lower fund performance, and increased brokerage costs.
PFI Prospectus | Inflation Protection Fund | Portfolio Duration Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Portfolio Duration Risk. Portfolio duration is a measure of the expected life of a fixed-income security and its sensitivity to changes in interest rates. The longer a fund’s average portfolio duration, the more sensitive the fund will be to changes in interest rates, which means funds with longer average portfolio durations may be more volatile than those with shorter durations.
PFI Prospectus | Inflation Protection Fund | Redemption And Large Transaction Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Redemption and Large Transaction Risk. Ownership of the Fund’s shares may be concentrated in one or a few large investors (such as funds of funds, institutional investors, and asset allocation programs) that may redeem or purchase shares in large quantities. These transactions may cause the Fund to sell securities to meet redemptions or to invest additional cash at times it would not otherwise do so, which may result in increased transaction costs, increased expenses, changes to expense ratios, and adverse effects to Fund performance. Such transactions may also accelerate the realization of taxable income if sales of portfolio securities result in gains. Moreover, reallocations by large shareholders among share classes of a fund may result in changes to the expense ratios of affected classes, which may increase the expenses paid by shareholders of the class that experienced the redemption.
PFI Prospectus | Inflation Protection Fund | U.S. Government Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock U.S. Government Securities Risk. Yields available from U.S. government securities are generally lower than yields from many other fixed-income securities. The value of U.S. government securities may be adversely impacted by changes in interest rates, changes in the credit rating of the U.S. government, or a default by the U.S. government.
PFI Prospectus | Inflation Protection Fund | U.S. Government-Sponsored Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock U.S. Government-Sponsored Securities Risk. Securities issued by U.S. government-sponsored enterprises such as the Federal Home Loan Mortgage Corporation, the Federal National Mortgage Association, and the Federal Home Loan Banks are not issued or guaranteed by the U.S. government.
PFI Prospectus | Inflation Protection Fund | Bloomberg U.S. Aggregate Bond Index (reflects no deduction for fees, expenses, or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
Label rr_AverageAnnualReturnLabel Bloomberg U.S. Aggregate Bond Index (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 5.53%
5 Years rr_AverageAnnualReturnYear05 1.10%
10 Years rr_AverageAnnualReturnYear10 1.81%
PFI Prospectus | Inflation Protection Fund | Bloomberg U.S. Treasury TIPS Index (reflects no deduction for fees, expenses, or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
Label rr_AverageAnnualReturnLabel Bloomberg U.S. Treasury TIPS Index (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 3.90%
5 Years rr_AverageAnnualReturnYear05 3.15%
10 Years rr_AverageAnnualReturnYear10 2.42%
PFI Prospectus | Inflation Protection Fund | Class J  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PIPJX
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.38%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.15%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.27%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.80%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 182
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 255
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 444
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 990
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 82
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 255
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 444
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 990
Label rr_AverageAnnualReturnLabel Class J Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 1.99%
5 Years rr_AverageAnnualReturnYear05 2.21%
10 Years rr_AverageAnnualReturnYear10 1.37%
PFI Prospectus | Inflation Protection Fund | Institutional Class  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PIPIX
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.38%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.02%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.40%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 41
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 128
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 224
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 505
Annual Return 2014 rr_AnnualReturn2014 3.20%
Annual Return 2015 rr_AnnualReturn2015 (2.15%)
Annual Return 2016 rr_AnnualReturn2016 3.83%
Annual Return 2017 rr_AnnualReturn2017 3.01%
Annual Return 2018 rr_AnnualReturn2018 (1.58%)
Annual Return 2019 rr_AnnualReturn2019 8.05%
Annual Return 2020 rr_AnnualReturn2020 10.59%
Annual Return 2021 rr_AnnualReturn2021 5.35%
Annual Return 2022 rr_AnnualReturn2022 (12.08%)
Annual Return 2023 rr_AnnualReturn2023 3.49%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Highest return for a quarter during the period of the bar chart above:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 4.72%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Lowest return for a quarter during the period of the bar chart above:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Jun. 30, 2022
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (6.33%)
Label rr_AverageAnnualReturnLabel Institutional Class Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 3.49%
5 Years rr_AverageAnnualReturnYear05 2.75%
10 Years rr_AverageAnnualReturnYear10 1.99%
PFI Prospectus | Inflation Protection Fund | Institutional Class | After Taxes on Distributions  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Institutional Class Return After Taxes on Distributions
1 Year rr_AverageAnnualReturnYear01 2.01%
5 Years rr_AverageAnnualReturnYear05 1.21%
10 Years rr_AverageAnnualReturnYear10 0.88%
PFI Prospectus | Inflation Protection Fund | Institutional Class | After Taxes on Distributions and Sales  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Institutional Class Return After Taxes on Distributions and Sale of Fund Shares
1 Year rr_AverageAnnualReturnYear01 2.07%
5 Years rr_AverageAnnualReturnYear05 1.54%
10 Years rr_AverageAnnualReturnYear10 1.08%
PFI Prospectus | Inflation Protection Fund | Class R-1  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PISPX
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.38%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.35%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.54%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.27%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 129
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 403
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 697
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,534
Label rr_AverageAnnualReturnLabel Class R-1 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 2.57%
5 Years rr_AverageAnnualReturnYear05 1.86%
10 Years rr_AverageAnnualReturnYear10 1.10%
PFI Prospectus | Inflation Protection Fund | Class R-3  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PIFPX
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.38%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.33%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.96%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 98
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 306
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 531
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,178
Label rr_AverageAnnualReturnLabel Class R-3 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 2.77%
5 Years rr_AverageAnnualReturnYear05 2.19%
10 Years rr_AverageAnnualReturnYear10 1.40%
PFI Prospectus | Inflation Protection Fund | Class R-4  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PIFSX
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.38%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.10%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.29%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.77%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 79
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 246
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 428
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 954
Label rr_AverageAnnualReturnLabel Class R-4 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 3.08%
5 Years rr_AverageAnnualReturnYear05 2.40%
10 Years rr_AverageAnnualReturnYear10 1.62%
PFI Prospectus | Inflation Protection Fund | Class R-5  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PBPPX
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.38%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.27%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.65%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 66
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 208
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 362
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 810
Label rr_AverageAnnualReturnLabel Class R-5 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 3.24%
5 Years rr_AverageAnnualReturnYear05 2.50%
10 Years rr_AverageAnnualReturnYear10 1.73%
PFI Prospectus | International Fund I  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading INTERNATIONAL FUND I
Objective [Heading] rr_ObjectiveHeading Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The Fund seeks long-term growth of capital.
Expense [Heading] rr_ExpenseHeading Fees and Expenses of the Fund
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock
This table describes the fees and expenses that you may pay if you buy, hold, and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below.

If you purchase Institutional Class or Class R-6 shares through certain programs offered by certain financial intermediaries, you may be required to pay a commission and/or other forms of compensation to the broker, or to your Financial Professional or other financial intermediary.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder Fees (fees paid directly from your investment):
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination February 28, 2025
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock
The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in Annual Fund Operating Expenses or in the Example, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 65.8% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 65.80%
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. The calculation of costs takes into account any applicable contractual fee waivers and/or expense reimbursements for the period noted in the table above. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
The Fund invests primarily in foreign equity securities, including emerging market securities. The Fund typically invests in foreign securities of at least ten countries. The Fund invests in equity securities of small, medium, and large market capitalization companies.
The Fund invests in value equity securities, an investment strategy that emphasizes buying equity securities that appear to be undervalued. The Fund also invests in growth equity securities, an investment strategy that emphasizes buying equity securities of companies whose potential for growth of capital and earnings is expected to be above average.
Risk [Heading] rr_RiskHeading Principal Risks
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
The following information provides some indication of the risks of investing in the Fund. Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. You may get updated performance information at www.PrincipalAM.com.
The bar chart shows the investment returns of the Fund’s Institutional Class shares for each full calendar year of operations for 10 years (or, if shorter, the life of the Fund). The table shows for the last one, five, and ten calendar year periods (or, if shorter, the life of the Fund), how the Fund’s average annual total returns compare with those of one or more broad measures of market performance.
For periods prior to the inception date of Class R-6 shares (November 22, 2016), the performance shown in the table for Class R-6 shares is that of the Fund’s Institutional Class shares, adjusted to reflect the fees and expenses of Class R-6 shares. These adjustments result in performance for such periods that is no higher than the historical performance of the Institutional Class shares.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following information provides some indication of the risks of investing in the Fund.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.PrincipalAM.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.
Bar Chart [Heading] rr_BarChartHeading Total Returns as of December 31
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
Highest return for a quarter during the period of the bar chart above:
Q2 202022.05 %
Lowest return for a quarter during the period of the bar chart above:
Q1 2020(22.85)%
Performance Table Heading rr_PerformanceTableHeading Average Annual Total ReturnsFor the periods ended December 31, 2023
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are shown for Institutional Class shares only and would be different for the other share classes.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock
After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. After-tax returns are shown for Institutional Class shares only and would be different for the other share classes.
PFI Prospectus | International Fund I | Risk Lose Money [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Many factors affect that value, and it is possible to lose money by investing in the Fund.
PFI Prospectus | International Fund I | Risk Not Insured Depository Institution [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
PFI Prospectus | International Fund I | Emerging Markets Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Emerging Markets Risk. Investments in emerging markets may have more risk than those in developed markets because the emerging markets are less developed and more illiquid. Emerging markets can also be subject to increased social, economic, regulatory, and political uncertainties and can be extremely volatile. The U.S. Securities and Exchange Commission, the U.S. Department of Justice, and other U.S. authorities may be limited in their ability to pursue bad actors in emerging markets, including with respect to fraud.
•China Investment Risk. The Fund invests a significant portion of its assets in securities of issuers located or operating in China. Investing in China involves certain heightened risks and considerations, including, among others: frequent trading suspensions and government interventions (including by nationalizing assets); currency exchange rate fluctuations or blockages; limits on using brokers and on foreign ownership; different financial reporting standards; higher dependence on exports and international trade; political and social instability; infectious disease outbreaks; regional and global conflicts; increased trade tariffs, embargoes, and other trade limitations; custody and other risks associated with programs used to access Chinese securities; and uncertainties in tax rules that could result in unexpected tax liabilities for the Fund. Significant portions of the Chinese securities markets may become rapidly illiquid, as Chinese issuers have the ability to suspend the trading of their equity securities. Moreover, actions by the U.S. government, such as delisting of certain Chinese companies from U.S. securities exchanges or otherwise restricting their operations in the U.S., may negatively impact the value of such securities held by the Fund.
PFI Prospectus | International Fund I | Emerging Markets Risk, China Investment Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock China Investment Risk. The Fund invests a significant portion of its assets in securities of issuers located or operating in China. Investing in China involves certain heightened risks and considerations, including, among others: frequent trading suspensions and government interventions (including by nationalizing assets); currency exchange rate fluctuations or blockages; limits on using brokers and on foreign ownership; different financial reporting standards; higher dependence on exports and international trade; political and social instability; infectious disease outbreaks; regional and global conflicts; increased trade tariffs, embargoes, and other trade limitations; custody and other risks associated with programs used to access Chinese securities; and uncertainties in tax rules that could result in unexpected tax liabilities for the Fund. Significant portions of the Chinese securities markets may become rapidly illiquid, as Chinese issuers have the ability to suspend the trading of their equity securities. Moreover, actions by the U.S. government, such as delisting of certain Chinese companies from U.S. securities exchanges or otherwise restricting their operations in the U.S., may negatively impact the value of such securities held by the Fund.
PFI Prospectus | International Fund I | Equity Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Equity Securities Risk. A variety of factors can negatively impact the value of equity securities held by a fund, including a decline in the issuer’s financial condition, unfavorable performance of the issuer’s sector or industry, or changes in response to overall market and economic conditions. A fund’s principal market segment(s) (such as market capitalization or style) may underperform other market segments or the equity markets as a whole.
•Growth Style Risk. Growth investing entails the risk that if growth companies do not increase their earnings at a rate expected by investors, the market price of their stock may decline significantly, even if earnings show an absolute increase. Growth company stocks also typically lack the dividend yield that can lessen price declines in market downturns.
•Smaller Companies Risk. Investments in smaller companies may involve greater risk and price volatility than investments in larger, more mature companies. Smaller companies may have limited product lines, markets, or financial resources; lack the competitive strength of larger companies; have less experienced managers; or depend on a few key employees. Their securities often are less widely held and trade less frequently and in lesser quantities, and their market prices often fluctuate more, than securities of larger companies.
•Value Style Risk. Value investing entails the risk that value stocks may continue to be undervalued by the market for extended periods, including the entire period during which the stock is held by a fund, or the events that would cause the stock price to increase may not occur as anticipated or at all. Moreover, a stock that appears to be undervalued actually may be appropriately priced at a low level and, therefore, would not be profitable for the fund.
PFI Prospectus | International Fund I | Equity Securities Risk, Growth Style Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Growth Style Risk. Growth investing entails the risk that if growth companies do not increase their earnings at a rate expected by investors, the market price of their stock may decline significantly, even if earnings show an absolute increase. Growth company stocks also typically lack the dividend yield that can lessen price declines in market downturns.
PFI Prospectus | International Fund I | Equity Securities Risk, Smaller Companies Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Smaller Companies Risk. Investments in smaller companies may involve greater risk and price volatility than investments in larger, more mature companies. Smaller companies may have limited product lines, markets, or financial resources; lack the competitive strength of larger companies; have less experienced managers; or depend on a few key employees. Their securities often are less widely held and trade less frequently and in lesser quantities, and their market prices often fluctuate more, than securities of larger companies.
PFI Prospectus | International Fund I | Equity Securities Risk, Value Style Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Value Style Risk. Value investing entails the risk that value stocks may continue to be undervalued by the market for extended periods, including the entire period during which the stock is held by a fund, or the events that would cause the stock price to increase may not occur as anticipated or at all. Moreover, a stock that appears to be undervalued actually may be appropriately priced at a low level and, therefore, would not be profitable for the fund.
PFI Prospectus | International Fund I | Foreign Currency Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Foreign Currency Risk. Risks of investing in securities denominated in, or that trade in, foreign (non-U.S.) currencies include changes in foreign exchange rates and foreign exchange restrictions.
PFI Prospectus | International Fund I | Foreign Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Foreign Securities Risk. The risks of foreign securities include loss of value as a result of: political or economic instability; nationalization, expropriation, or confiscatory taxation; settlement delays; and limited government regulation (including less stringent reporting, accounting, and disclosure standards than are required of U.S. companies).
PFI Prospectus | International Fund I | Redemption And Large Transaction Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Redemption and Large Transaction Risk. Ownership of the Fund’s shares may be concentrated in one or a few large investors (such as funds of funds, institutional investors, and asset allocation programs) that may redeem or purchase shares in large quantities. These transactions may cause the Fund to sell securities to meet redemptions or to invest additional cash at times it would not otherwise do so, which may result in increased transaction costs, increased expenses, changes to expense ratios, and adverse effects to Fund performance. Such transactions may also accelerate the realization of taxable income if sales of portfolio securities result in gains. Moreover, reallocations by large shareholders among share classes of a fund may result in changes to the expense ratios of affected classes, which may increase the expenses paid by shareholders of the class that experienced the redemption.
PFI Prospectus | International Fund I | MSCI ACWI Ex USA Index NTR (reflects withholding taxes on foreign dividends, but no deduction for fees, expenses, or other taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects withholding taxes on foreign dividends, but no deduction for fees, expenses, or other taxes)
Label rr_AverageAnnualReturnLabel MSCI ACWI Ex USA Index NTR (reflects withholding taxes on foreign dividends, but no deduction for fees, expenses, or other taxes)
1 Year rr_AverageAnnualReturnYear01 15.62%
5 Years rr_AverageAnnualReturnYear05 7.08%
10 Years rr_AverageAnnualReturnYear10 3.83%
PFI Prospectus | International Fund I | Institutional Class  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PINIX
Shareholder Fee, Other rr_ShareholderFeeOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.65%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.36% [21]
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.01%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.09%) [22]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.92%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 94
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 313
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 549
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,228
Annual Return 2014 rr_AnnualReturn2014 1.75%
Annual Return 2015 rr_AnnualReturn2015 0.92%
Annual Return 2016 rr_AnnualReturn2016 (4.68%)
Annual Return 2017 rr_AnnualReturn2017 38.83%
Annual Return 2018 rr_AnnualReturn2018 (23.65%)
Annual Return 2019 rr_AnnualReturn2019 32.10%
Annual Return 2020 rr_AnnualReturn2020 13.97%
Annual Return 2021 rr_AnnualReturn2021 12.68%
Annual Return 2022 rr_AnnualReturn2022 (25.27%)
Annual Return 2023 rr_AnnualReturn2023 15.86%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Highest return for a quarter during the period of the bar chart above:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 22.05%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Lowest return for a quarter during the period of the bar chart above:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (22.85%)
Label rr_AverageAnnualReturnLabel Institutional Class Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 15.86%
5 Years rr_AverageAnnualReturnYear05 7.99%
10 Years rr_AverageAnnualReturnYear10 4.30%
PFI Prospectus | International Fund I | Institutional Class | After Taxes on Distributions  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Institutional Class Return After Taxes on Distributions
1 Year rr_AverageAnnualReturnYear01 14.96%
5 Years rr_AverageAnnualReturnYear05 6.64%
10 Years rr_AverageAnnualReturnYear10 3.35%
PFI Prospectus | International Fund I | Institutional Class | After Taxes on Distributions and Sales  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Institutional Class Return After Taxes on Distributions and Sale of Fund Shares
1 Year rr_AverageAnnualReturnYear01 9.86%
5 Years rr_AverageAnnualReturnYear05 6.42%
10 Years rr_AverageAnnualReturnYear10 3.42%
PFI Prospectus | International Fund I | Class R-1  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PPISX
Shareholder Fee, Other rr_ShareholderFeeOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.65%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.35%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.71% [21]
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.71%
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.71%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 174
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 539
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 928
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 2,019
Label rr_AverageAnnualReturnLabel Class R-1 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 14.86%
5 Years rr_AverageAnnualReturnYear05 7.13%
10 Years rr_AverageAnnualReturnYear10 3.46%
PFI Prospectus | International Fund I | Class R-3  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PRPPX
Shareholder Fee, Other rr_ShareholderFeeOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.65%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.50% [21]
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.40%
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.40%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 143
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 443
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 766
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,680
Label rr_AverageAnnualReturnLabel Class R-3 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 15.32%
5 Years rr_AverageAnnualReturnYear05 7.47%
10 Years rr_AverageAnnualReturnYear10 3.78%
PFI Prospectus | International Fund I | Class R-4  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PUPPX
Shareholder Fee, Other rr_ShareholderFeeOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.65%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.10%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.46% [21]
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.21%
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.21%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 123
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 384
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 665
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,466
Label rr_AverageAnnualReturnLabel Class R-4 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 15.53%
5 Years rr_AverageAnnualReturnYear05 7.70%
10 Years rr_AverageAnnualReturnYear10 3.99%
PFI Prospectus | International Fund I | Class R-5  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PTPPX
Shareholder Fee, Other rr_ShareholderFeeOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.65%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.44% [21]
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.09%
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.09%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 111
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 347
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 601
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,329
Label rr_AverageAnnualReturnLabel Class R-5 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 15.64%
5 Years rr_AverageAnnualReturnYear05 7.80%
10 Years rr_AverageAnnualReturnYear10 4.10%
PFI Prospectus | International Fund I | Class R-6  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PIIDX
Shareholder Fee, Other rr_ShareholderFeeOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.65%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.19% [21]
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.84%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.02%) [22]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.82%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 84
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 266
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 464
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,035
Label rr_AverageAnnualReturnLabel Class R-6 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 15.97%
5 Years rr_AverageAnnualReturnYear05 8.10%
10 Years rr_AverageAnnualReturnYear10 4.34%
PFI Prospectus | LargeCap Growth Fund I  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading LARGECAP GROWTH FUND I
Objective [Heading] rr_ObjectiveHeading Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The Fund seeks long-term growth of capital.
Expense [Heading] rr_ExpenseHeading Fees and Expenses of the Fund
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock
This table describes the fees and expenses that you may pay if you buy, hold, and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in Class A Shares of Principal Funds, Inc. More information about these and other discounts is available from your financial intermediary and in “Choosing a Share Class and The Costs of Investing” beginning on page 426 of the Fund’s Prospectus, Appendix B to the Prospectus titled “Intermediary-Specific Sales Charge Waivers and Reductions,” and “Multiple Class Structure” beginning on page 70 of the Fund’s Statement of Additional Information.
If you purchase Institutional Class or Class R-6 shares through certain programs offered by certain financial intermediaries, you may be required to pay a commission and/or other forms of compensation to the broker, or to your Financial Professional or other financial intermediary.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder Fees (fees paid directly from your investment)
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination February 28, 2025
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock
The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in Annual Fund Operating Expenses or in the Example, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 26.5% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 26.50%
Expense Breakpoint Discounts [Text] rr_ExpenseBreakpointDiscounts You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in Class A Shares of Principal Funds, Inc.
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 50,000
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. The calculation of costs takes into account any applicable contractual fee waivers and/or expense reimbursements for the period noted in the table above. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, No Redemption, By Year, Caption [Text] rr_ExpenseExampleNoRedemptionByYearCaption With respect to Class J shares, you would pay the following expenses if you did not redeem your shares (all other classes would be the same as in the above example):
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
Under normal circumstances, the Fund invests at least 80% of its net assets, plus any borrowings for investment purposes, in equity securities of companies with large market capitalizations at the time of purchase. For this Fund, companies with large market capitalizations are those with market capitalizations within the range of companies comprising the Russell 1000® Growth Index (as of January 31, 2024, this range was between approximately $684.1 million and $3.0 trillion). The Fund also invests in growth equity securities, an investment strategy that emphasizes buying equity securities of companies whose potential for growth of capital and earnings is expected to be above average, and equity securities of companies with medium market capitalizations. The Fund invested significantly in industries within the health care and information technology sectors as of January 31, 2024.
The Fund is primarily actively managed by the sub-advisors. In addition, Principal Global Investors, LLC may invest up to 30% of the Fund’s assets using an index sampling strategy designed to match the performance of the Russell 1000® Growth Index.
The Fund is considered non-diversified, which means it can invest a higher percentage of assets in securities of individual issuers than a diversified fund. As a result, changes in the value of a single investment could cause greater fluctuations in the Fund’s share price than would occur in a more diversified fund.
Strategy Portfolio Concentration [Text] rr_StrategyPortfolioConcentration The Fund is primarily actively managed by the sub-advisors. In addition, Principal Global Investors, LLC may invest up to 30% of the Fund’s assets using an index sampling strategy designed to match the performance of the Russell 1000® Growth Index.
Risk [Heading] rr_RiskHeading Principal Risks
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
The following information provides some indication of the risks of investing in the Fund. Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. You may get updated performance information at www.PrincipalAM.com.
The bar chart shows the investment returns of the Fund’s Class A shares for each full calendar year of operations for 10 years (or, if shorter, the life of the Fund). These annual returns do not reflect sales charges on Class A shares; if they did, results would be lower. The table shows for the last one, five, and ten calendar year periods (or, if shorter, the life of the Fund), how the Fund’s average annual total returns compare with those of one or more broad measures of market performance.
For periods prior to the inception date of Class R-6 shares (November 25, 2014), the performance shown in the table for Class R-6 shares is that of the Fund’s Institutional Class shares, adjusted to reflect the fees and expenses of Class R-6 shares. These adjustments result in performance for such periods that is no higher than the historical performance of the Institutional Class shares.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following information provides some indication of the risks of investing in the Fund.
Performance Additional Market Index [Text] rr_PerformanceAdditionalMarketIndex The Russell 1000 Growth Index is included as an additional index for the Fund as it shows how the Fund’s performance compares with the returns of an index of funds with similar investment objectives.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.PrincipalAM.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.
Bar Chart [Heading] rr_BarChartHeading Total Returns as of December 31
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
Highest return for a quarter during the period of the bar chart above:Q2 202027.72 %
Lowest return for a quarter during the period of the bar chart above:Q2 2022(21.61)%
Performance Table Heading rr_PerformanceTableHeading Average Annual Total ReturnsFor the periods ended December 31, 2023
Performance Table Market Index Changed rr_PerformanceTableMarketIndexChanged Effective March 1, 2024, the Fund changed its primary broad-based index to the Russell 1000 Index in order to meet the revised definition of “broad-based securities market index.”
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are shown for Class A shares only and would be different for the other share classes.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock
After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. After-tax returns are shown for Class A shares only and would be different for the other share classes.
Effective March 1, 2024, the Fund changed its primary broad-based index to the Russell 1000 Index in order to meet the revised definition of “broad-based securities market index.” The Russell 1000 Growth Index is included as an additional index for the Fund as it shows how the Fund’s performance compares with the returns of an index of funds with similar investment objectives.
PFI Prospectus | LargeCap Growth Fund I | Risk Lose Money [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Many factors affect that value, and it is possible to lose money by investing in the Fund.
PFI Prospectus | LargeCap Growth Fund I | Risk Not Insured Depository Institution [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
PFI Prospectus | LargeCap Growth Fund I | Risk Nondiversified Status [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Non-Diversification Risk. A non-diversified fund may invest a high percentage of its assets in the securities of a small number of issuers and is more likely than diversified funds to be significantly affected by a specific security’s poor performance.
PFI Prospectus | LargeCap Growth Fund I | Consumer Goods And Consumer Services Sector Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Consumer Goods and Consumer Services Sector Risk. The Fund invests in securities of companies in the consumer services and consumers goods sectors. Such companies are particularly subject to risks related to performance of the overall global economy, interest rates, competition, government regulation, and consumer confidence. Success depends heavily on disposable income and consumer spending, and is also impacted by consumer interest and marketing campaigns. Companies in these sectors may be subject to severe competition, which may have an adverse impact on their profitability. Changes in demographics and consumer tastes can affect the demand for, and success of, consumer goods and services in the marketplace.
PFI Prospectus | LargeCap Growth Fund I | Equity Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Equity Securities Risk. A variety of factors can negatively impact the value of equity securities held by a fund, including a decline in the issuer’s financial condition, unfavorable performance of the issuer’s sector or industry, or changes in response to overall market and economic conditions. A fund’s principal market segment(s) (such as market capitalization or style) may underperform other market segments or the equity markets as a whole.
•Growth Style Risk. Growth investing entails the risk that if growth companies do not increase their earnings at a rate expected by investors, the market price of their stock may decline significantly, even if earnings show an absolute increase. Growth company stocks also typically lack the dividend yield that can lessen price declines in market downturns.
•Smaller Companies Risk. Investments in smaller companies may involve greater risk and price volatility than investments in larger, more mature companies. Smaller companies may have limited product lines, markets, or financial resources; lack the competitive strength of larger companies; have less experienced managers; or depend on a few key employees. Their securities often are less widely held and trade less frequently and in lesser quantities, and their market prices often fluctuate more, than securities of larger companies.
PFI Prospectus | LargeCap Growth Fund I | Equity Securities Risk, Growth Style Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Growth Style Risk. Growth investing entails the risk that if growth companies do not increase their earnings at a rate expected by investors, the market price of their stock may decline significantly, even if earnings show an absolute increase. Growth company stocks also typically lack the dividend yield that can lessen price declines in market downturns.
PFI Prospectus | LargeCap Growth Fund I | Equity Securities Risk, Smaller Companies Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Smaller Companies Risk. Investments in smaller companies may involve greater risk and price volatility than investments in larger, more mature companies. Smaller companies may have limited product lines, markets, or financial resources; lack the competitive strength of larger companies; have less experienced managers; or depend on a few key employees. Their securities often are less widely held and trade less frequently and in lesser quantities, and their market prices often fluctuate more, than securities of larger companies.
PFI Prospectus | LargeCap Growth Fund I | Health Care Sector Risk  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Health Care Sector Risk. A fund that invests in securities of companies in the healthcare sector (which includes companies involved in several industries, including biotechnology research and production, drugs and pharmaceuticals and health care facilities and services) is subject to the direct risks of investing in such companies. These companies are subject to extensive competition (due to, among others, generic drug sales or the loss of patent protection), product liability litigation and increased government regulation. Research and development costs of bringing new drugs to market are substantial, and there is no guarantee that a proposed product will ever come to market. Such companies are heavily dependent on patent and intellectual property rights, the loss or impairment of which may adversely affect profitability. Healthcare facility operators may be affected by the demand for services, efforts by government or insurers to limit rates, restriction of government financial assistance and competition from other providers.
PFI Prospectus | LargeCap Growth Fund I | Information Technology Sector Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Information Technology Sector Risk. Companies in the information technology sector may face dramatic and often unpredictable changes in growth rates and are particularly vulnerable to changes in technology product cycles, product obsolescence, government regulation, and competition, both domestically and internationally. Such companies are heavily dependent on patent and intellectual property rights, the loss or impairment of which may adversely affect profitability.
PFI Prospectus | LargeCap Growth Fund I | Passive Strategy Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Passive Strategy Risk. A portion of the Fund seeks to match the performance of a specified index. However, the correlation between the performance of this portion of the Fund and index performance may be affected by many factors, such as Fund expenses, the timing of cash flows into and out of the Fund, changes in securities markets, and changes in the composition of the index.
PFI Prospectus | LargeCap Growth Fund I | Redemption And Large Transaction Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Redemption and Large Transaction Risk. Ownership of the Fund’s shares may be concentrated in one or a few large investors (such as funds of funds, institutional investors, and asset allocation programs) that may redeem or purchase shares in large quantities. These transactions may cause the Fund to sell securities to meet redemptions or to invest additional cash at times it would not otherwise do so, which may result in increased transaction costs, increased expenses, changes to expense ratios, and adverse effects to Fund performance. Such transactions may also accelerate the realization of taxable income if sales of portfolio securities result in gains. Moreover, reallocations by large shareholders among share classes of a fund may result in changes to the expense ratios of affected classes, which may increase the expenses paid by shareholders of the class that experienced the redemption.
PFI Prospectus | LargeCap Growth Fund I | Russell 1000 Index (reflects no deduction for fees, expenses, or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
Label rr_AverageAnnualReturnLabel Russell 1000 Index (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 26.53%
5 Years rr_AverageAnnualReturnYear05 15.52%
10 Years rr_AverageAnnualReturnYear10 11.80%
PFI Prospectus | LargeCap Growth Fund I | Russell 1000 Growth Index (reflects no deduction for fees, expenses, or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
Label rr_AverageAnnualReturnLabel Russell 1000 Growth Index (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 42.68%
5 Years rr_AverageAnnualReturnYear05 19.50%
10 Years rr_AverageAnnualReturnYear10 14.86%
PFI Prospectus | LargeCap Growth Fund I | Class A  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PLGAX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 5.50%
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.60%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.17%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.02%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.02%) [23]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.00%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 646
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 855
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,080
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,727
Annual Return 2014 rr_AnnualReturn2014 7.99%
Annual Return 2015 rr_AnnualReturn2015 7.45%
Annual Return 2016 rr_AnnualReturn2016 0.40%
Annual Return 2017 rr_AnnualReturn2017 33.10%
Annual Return 2018 rr_AnnualReturn2018 3.28%
Annual Return 2019 rr_AnnualReturn2019 34.42%
Annual Return 2020 rr_AnnualReturn2020 35.52%
Annual Return 2021 rr_AnnualReturn2021 21.37%
Annual Return 2022 rr_AnnualReturn2022 (34.26%)
Annual Return 2023 rr_AnnualReturn2023 40.10%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Highest return for a quarter during the period of the bar chart above:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 27.72%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Lowest return for a quarter during the period of the bar chart above:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Jun. 30, 2022
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (21.61%)
Label rr_AverageAnnualReturnLabel Class A Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 32.35%
5 Years rr_AverageAnnualReturnYear05 14.00%
10 Years rr_AverageAnnualReturnYear10 11.91%
PFI Prospectus | LargeCap Growth Fund I | Class A | After Taxes on Distributions  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Class A Return After Taxes on Distributions
1 Year rr_AverageAnnualReturnYear01 30.41%
5 Years rr_AverageAnnualReturnYear05 11.60%
10 Years rr_AverageAnnualReturnYear10 9.50%
PFI Prospectus | LargeCap Growth Fund I | Class A | After Taxes on Distributions and Sales  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Class A Return After Taxes on Distributions and Sale of Fund Shares
1 Year rr_AverageAnnualReturnYear01 20.49%
5 Years rr_AverageAnnualReturnYear05 10.91%
10 Years rr_AverageAnnualReturnYear10 9.15%
PFI Prospectus | LargeCap Growth Fund I | Class J  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PLGJX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.60%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.15%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.09%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.84%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.02%) [23]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.82%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 184
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 266
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 464
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,035
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 84
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 266
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 464
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,035
Label rr_AverageAnnualReturnLabel Class J Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 39.31%
5 Years rr_AverageAnnualReturnYear05 15.49%
10 Years rr_AverageAnnualReturnYear10 12.81%
PFI Prospectus | LargeCap Growth Fund I | Institutional Class  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PLGIX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.60%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.10%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.70%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.02%) [23]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.68%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 69
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 222
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 388
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 869
Label rr_AverageAnnualReturnLabel Institutional Class Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 40.51%
5 Years rr_AverageAnnualReturnYear05 15.65%
10 Years rr_AverageAnnualReturnYear10 13.03%
PFI Prospectus | LargeCap Growth Fund I | Class R-1  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PCRSX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.60%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.35%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.54%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.49%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.02%) [23]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.47%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 150
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 469
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 811
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,778
Label rr_AverageAnnualReturnLabel Class R-1 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 39.42%
5 Years rr_AverageAnnualReturnYear05 14.72%
10 Years rr_AverageAnnualReturnYear10 12.11%
PFI Prospectus | LargeCap Growth Fund I | Class R-3  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PPUMX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.60%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.33%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.18%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.02%) [23]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.16%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 118
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 373
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 647
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,430
Label rr_AverageAnnualReturnLabel Class R-3 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 39.79%
5 Years rr_AverageAnnualReturnYear05 15.10%
10 Years rr_AverageAnnualReturnYear10 12.46%
PFI Prospectus | LargeCap Growth Fund I | Class R-4  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PPUSX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.60%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.10%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.29%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.99%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.02%) [23]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.97%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 99
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 313
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 545
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,211
Label rr_AverageAnnualReturnLabel Class R-4 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 40.13%
5 Years rr_AverageAnnualReturnYear05 15.32%
10 Years rr_AverageAnnualReturnYear10 12.67%
PFI Prospectus | LargeCap Growth Fund I | Class R-5  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PPUPX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.60%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.27%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.87%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.02%) [23]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.85%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 87
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 276
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 480
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,071
Label rr_AverageAnnualReturnLabel Class R-5 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 40.23%
5 Years rr_AverageAnnualReturnYear05 15.46%
10 Years rr_AverageAnnualReturnYear10 12.81%
PFI Prospectus | LargeCap Growth Fund I | Class R-6  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PLCGX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.60%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.01%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.61%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.02%) [23]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.59%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 60
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 193
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 338
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 760
Label rr_AverageAnnualReturnLabel Class R-6 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 40.60%
5 Years rr_AverageAnnualReturnYear05 15.74%
10 Years rr_AverageAnnualReturnYear10 13.08%
PFI Prospectus | LargeCap S&P 500 Index Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading LARGECAP S&P 500 INDEX FUND
Objective [Heading] rr_ObjectiveHeading Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The Fund seeks long-term growth of capital.
Expense [Heading] rr_ExpenseHeading Fees and Expenses of the Fund
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock
This table describes the fees and expenses that you may pay if you buy, hold, and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in Class A Shares of Principal Funds, Inc. More information about these and other discounts is available from your financial intermediary and in “Choosing a Share Class and The Costs of Investing” beginning on page 426 of the Fund’s Prospectus, Appendix B to the Prospectus titled “Intermediary-Specific Sales Charge Waivers and Reductions,” and “Multiple Class Structure” beginning on page 70 of the Fund’s Statement of Additional Information.
If you purchase Institutional Class shares through certain programs offered by certain financial intermediaries, you may be required to pay a commission and/or other forms of compensation to the broker, or to your Financial Professional or other financial intermediary.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder Fees (fees paid directly from your investment)
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Fund Operating Expenses(expenses that you pay each year as a percentage of the value of your investment)
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock 5.9% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 5.90%
Expense Breakpoint Discounts [Text] rr_ExpenseBreakpointDiscounts You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in Class A Shares of Principal Funds, Inc.
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 50,000
Expenses Restated to Reflect Current [Text] rr_ExpensesRestatedToReflectCurrent Fees have been restated to reflect current fees.
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. The calculation of costs takes into account any applicable contractual fee waivers and/or expense reimbursements for the period noted in the table above. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, No Redemption, By Year, Caption [Text] rr_ExpenseExampleNoRedemptionByYearCaption With respect to Class J shares, you would pay the following expenses if you did not redeem your shares (all other classes would be the same as in the above example):
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
Under normal circumstances, the Fund invests at least 80% of its net assets, plus any borrowings for investment purposes, in equity securities of companies that compose the Standard & Poor’s (“S&P”) 500 Index (the “Index”) at the time of purchase. The Index is designed to represent U.S. equities with risk/return characteristics of the large cap universe. As of January 31, 2024, the market capitalization range of the companies comprising the Index was between approximately $4.9 billion and $3.0 trillion. Each component stock of the Index is weighted in proportion to its total market value. The Index is rebalanced quarterly.
The Fund employs a passive investment approach designed to attempt to track the performance of the Index. In seeking its objective, the Fund typically employs a replication strategy, which involves investing in all the securities that make up the Index, in the same proportions as the Index.
The Fund uses derivative strategies and invests in exchange-traded funds (“ETFs”). A derivative is a financial arrangement, the value of which is derived from, or based on, a traditional security, asset, or market index. Specifically, the Fund invests in index futures and equity ETFs on a daily basis to gain exposure to the Index in an effort to minimize tracking error relative to the benchmark.
The Fund will not concentrate (i.e., invest more than 25% of its assets) its investments in a particular industry except to the extent the Index is so concentrated. As of January 31, 2024, the Index was not concentrated in any industry.
Note:    “Standard & Poor’s 500” and “S&P 500” are trademarks of S&P Global and have been licensed by Principal. The Fund is not sponsored, endorsed, sold, or promoted by S&P Global, and S&P Global makes no representation regarding the advisability of investing in the Fund.
Strategy Portfolio Concentration [Text] rr_StrategyPortfolioConcentration Under normal circumstances, the Fund invests at least 80% of its net assets, plus any borrowings for investment purposes, in equity securities of companies that compose the Standard & Poor’s (“S&P”) 500 Index (the “Index”) at the time of purchase.
Risk [Heading] rr_RiskHeading Principal Risks
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
The following information provides some indication of the risks of investing in the Fund. Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. You may get updated performance information at www.PrincipalAM.com.
The bar chart shows the investment returns of the Fund’s Class A shares for each full calendar year of operations for 10 years (or, if shorter, the life of the Fund). These annual returns do not reflect sales charges on Class A shares; if they did, results would be lower. The table shows for the last one, five, and ten calendar year periods (or, if shorter, the life of the Fund), how the Fund’s average annual total returns compare with those of one or more broad measures of market performance.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following information provides some indication of the risks of investing in the Fund.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.PrincipalAM.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.
Bar Chart [Heading] rr_BarChartHeading Total Returns as of December 31
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
Highest return for a quarter during the period of the bar chart above:
Q2 202020.38 %
Lowest return for a quarter during the period of the bar chart above:
Q1 2020(19.67)%
Performance Table Heading rr_PerformanceTableHeading Average Annual Total ReturnsFor the periods ended December 31, 2023
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are shown for Class A shares only and would be different for the other share classes.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock
After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. After-tax returns are shown for Class A shares only and would be different for the other share classes.
PFI Prospectus | LargeCap S&P 500 Index Fund | Risk Lose Money [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Many factors affect that value, and it is possible to lose money by investing in the Fund.
PFI Prospectus | LargeCap S&P 500 Index Fund | Risk Not Insured Depository Institution [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
PFI Prospectus | LargeCap S&P 500 Index Fund | Derivatives Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Derivatives Risk. Derivatives may not move in the direction anticipated by the portfolio manager. Transactions in derivatives may increase volatility, cause the liquidation of portfolio positions when not advantageous to do so, and result in disproportionate losses that may be substantially greater than a fund’s initial investment.
•Futures. Futures contracts involve specific risks, including: the imperfect correlation between the change in market value of the instruments held by the Fund and the price of the futures contract; possible lack of a liquid secondary market for a futures contract and the resulting inability to close a futures contract when desired; counterparty risk; and if the Fund has insufficient cash, it may have to sell securities from its portfolio to meet daily variation margin requirements.
PFI Prospectus | LargeCap S&P 500 Index Fund | Derivatives Risk, Futures Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Futures. Futures contracts involve specific risks, including: the imperfect correlation between the change in market value of the instruments held by the Fund and the price of the futures contract; possible lack of a liquid secondary market for a futures contract and the resulting inability to close a futures contract when desired; counterparty risk; and if the Fund has insufficient cash, it may have to sell securities from its portfolio to meet daily variation margin requirements.
PFI Prospectus | LargeCap S&P 500 Index Fund | Equity Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Equity Securities Risk. A variety of factors can negatively impact the value of equity securities held by a fund, including a decline in the issuer’s financial condition, unfavorable performance of the issuer’s sector or industry, or changes in response to overall market and economic conditions. A fund’s principal market segment(s) (such as market capitalization or style) may underperform other market segments or the equity markets as a whole.
PFI Prospectus | LargeCap S&P 500 Index Fund | Index Fund Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Index Fund Risk. Index funds use a passive investment approach and generally do not attempt to manage market volatility, use defensive strategies, or reduce the effect of any long-term periods of poor investment performance. Therefore, the Fund may hold securities that present risks that an investment advisor researching individual securities might seek to avoid. An index fund has operating and other expenses while an index does not. As a result, over time, index funds tend to underperform the index. The correlation between fund performance and index performance may also be affected by the type of passive investment approach used by a fund (sampling or replication), changes in securities markets, changes in the composition of the index, and the timing of purchases and sales of fund shares. Errors or delays in compiling or rebalancing the Index may impact the performance of the Fund and increase transaction costs.
PFI Prospectus | LargeCap S&P 500 Index Fund | Industry Concentration Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Industry Concentration Risk. A fund that concentrates investments in a particular industry or group of industries has greater exposure than other funds to market, economic, and other factors affecting that industry or group of industries.
PFI Prospectus | LargeCap S&P 500 Index Fund | Investment Company Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Investment Company Securities Risk. A fund that invests in another investment company (for example, another fund or an exchange-traded fund (or ETF)) is subject to the risks associated with direct ownership of the securities in which such investment company invests. Fund shareholders indirectly bear their proportionate share of the expenses of each such investment company.
PFI Prospectus | LargeCap S&P 500 Index Fund | Redemption And Large Transaction Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Redemption and Large Transaction Risk. Ownership of the Fund’s shares may be concentrated in one or a few large investors (such as funds of funds, institutional investors, and asset allocation programs) that may redeem or purchase shares in large quantities. These transactions may cause the Fund to sell securities to meet redemptions or to invest additional cash at times it would not otherwise do so, which may result in increased transaction costs, increased expenses, changes to expense ratios, and adverse effects to Fund performance. Such transactions may also accelerate the realization of taxable income if sales of portfolio securities result in gains. Moreover, reallocations by large shareholders among share classes of a fund may result in changes to the expense ratios of affected classes, which may increase the expenses paid by shareholders of the class that experienced the redemption.
PFI Prospectus | LargeCap S&P 500 Index Fund | S&P 500 Index (reflects no deduction for fees, expenses, or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
Label rr_AverageAnnualReturnLabel S&P 500 Index (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 26.29%
5 Years rr_AverageAnnualReturnYear05 15.69%
10 Years rr_AverageAnnualReturnYear10 12.03%
PFI Prospectus | LargeCap S&P 500 Index Fund | Class A  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PLSAX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 1.50%
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther 0.25%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.10% [24]
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.15%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.13%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.38%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 188
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 270
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 360
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 623
Annual Return 2014 rr_AnnualReturn2014 13.14%
Annual Return 2015 rr_AnnualReturn2015 0.90%
Annual Return 2016 rr_AnnualReturn2016 11.42%
Annual Return 2017 rr_AnnualReturn2017 21.23%
Annual Return 2018 rr_AnnualReturn2018 (4.83%)
Annual Return 2019 rr_AnnualReturn2019 30.95%
Annual Return 2020 rr_AnnualReturn2020 17.88%
Annual Return 2021 rr_AnnualReturn2021 28.10%
Annual Return 2022 rr_AnnualReturn2022 (18.43%)
Annual Return 2023 rr_AnnualReturn2023 25.74%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Highest return for a quarter during the period of the bar chart above:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 20.38%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Lowest return for a quarter during the period of the bar chart above:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (19.67%)
Label rr_AverageAnnualReturnLabel Class A Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 23.88%
5 Years rr_AverageAnnualReturnYear05 14.84%
10 Years rr_AverageAnnualReturnYear10 11.35%
PFI Prospectus | LargeCap S&P 500 Index Fund | Class A | After Taxes on Distributions  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Class A Return After Taxes on Distributions
1 Year rr_AverageAnnualReturnYear01 22.75%
5 Years rr_AverageAnnualReturnYear05 13.21%
10 Years rr_AverageAnnualReturnYear10 10.03%
PFI Prospectus | LargeCap S&P 500 Index Fund | Class A | After Taxes on Distributions and Sales  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Class A Return After Taxes on Distributions and Sale of Fund Shares
1 Year rr_AverageAnnualReturnYear01 14.92%
5 Years rr_AverageAnnualReturnYear05 11.74%
10 Years rr_AverageAnnualReturnYear10 9.11%
PFI Prospectus | LargeCap S&P 500 Index Fund | Class J  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PSPJX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.10% [24]
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.15%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.07%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.32%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 133
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 103
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 180
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 406
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 33
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 103
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 180
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 406
Label rr_AverageAnnualReturnLabel Class J Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 24.83%
5 Years rr_AverageAnnualReturnYear05 15.27%
10 Years rr_AverageAnnualReturnYear10 11.59%
PFI Prospectus | LargeCap S&P 500 Index Fund | Institutional Class  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PLFIX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.10% [24]
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.02%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.12%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 12
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 39
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 68
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 154
Label rr_AverageAnnualReturnLabel Institutional Class Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 26.03%
5 Years rr_AverageAnnualReturnYear05 15.48%
10 Years rr_AverageAnnualReturnYear10 11.84%
PFI Prospectus | LargeCap S&P 500 Index Fund | Class R-1  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PLPIX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.10% [24]
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.35%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.53%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.98%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 100
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 312
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 542
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,201
Label rr_AverageAnnualReturnLabel Class R-1 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 24.94%
5 Years rr_AverageAnnualReturnYear05 14.48%
10 Years rr_AverageAnnualReturnYear10 10.87%
PFI Prospectus | LargeCap S&P 500 Index Fund | Class R-3  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PLFMX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.10% [24]
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.32%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.67%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 68
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 214
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 373
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 835
Label rr_AverageAnnualReturnLabel Class R-3 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 25.30%
5 Years rr_AverageAnnualReturnYear05 14.83%
10 Years rr_AverageAnnualReturnYear10 11.21%
PFI Prospectus | LargeCap S&P 500 Index Fund | Class R-4  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PLFSX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.10% [24]
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.10%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.28%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.48%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 49
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 154
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 269
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 604
Label rr_AverageAnnualReturnLabel Class R-4 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 25.57%
5 Years rr_AverageAnnualReturnYear05 15.06%
10 Years rr_AverageAnnualReturnYear10 11.43%
PFI Prospectus | LargeCap S&P 500 Index Fund | Class R-5  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PLFPX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.10% [24]
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.26%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.36%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 37
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 116
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 202
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 456
Label rr_AverageAnnualReturnLabel Class R-5 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 25.75%
5 Years rr_AverageAnnualReturnYear05 15.20%
10 Years rr_AverageAnnualReturnYear10 11.57%
PFI Prospectus | LargeCap Value Fund III  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading LARGECAP VALUE FUND III
Objective [Heading] rr_ObjectiveHeading Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The Fund seeks long-term growth of capital.
Expense [Heading] rr_ExpenseHeading Fees and Expenses of the Fund
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock
This table describes the fees and expenses that you may pay if you buy, hold, and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below.
If you purchase Institutional Class shares through certain programs offered by certain financial intermediaries, you may be required to pay a commission and/or other forms of compensation to the broker, or to your Financial Professional or other financial intermediary.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder Fees (fees paid directly from your investment)
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination February 28, 2025
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock
The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in Annual Fund Operating Expenses or in the Example, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 44.9% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 44.90%
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. The calculation of costs takes into account any applicable contractual fee waivers and/or expense reimbursements for the period noted in the table above. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, No Redemption, By Year, Caption [Text] rr_ExpenseExampleNoRedemptionByYearCaption With respect to Class J shares, you would pay the following expenses if you did not redeem your shares (all other classes would be the same as in the above example):
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
Under normal circumstances, the Fund invests at least 80% of its net assets, plus any borrowings for investment purposes, in companies with large market capitalizations at the time of purchase. For this Fund, companies with large market capitalizations are those with market capitalizations within the range of companies comprising the Russell 1000® Value Index (as of January 31, 2024, this range was between approximately $353.3 million and $837.9 billion). The Fund invests in value equity securities, an investment strategy that emphasizes buying equity securities that appear to be undervalued. The Fund also invests in equity securities of companies with medium market capitalizations.
The Fund is primarily actively managed by the sub-advisors. In addition, Principal Global Investors, LLC may invest up to 30% of the Fund’s assets using an index sampling strategy designed to match the performance of the Russell 1000® Value Index.
Strategy Portfolio Concentration [Text] rr_StrategyPortfolioConcentration The Fund is primarily actively managed by the sub-advisors. In addition, Principal Global Investors, LLC may invest up to 30% of the Fund’s assets using an index sampling strategy designed to match the performance of the Russell 1000® Value Index.
Risk [Heading] rr_RiskHeading Principal Risks
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
The following information provides some indication of the risks of investing in the Fund. Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. You may get updated performance information at www.PrincipalAM.com.
The bar chart shows the investment returns of the Fund’s Institutional Class shares for each full calendar year of operations for 10 years (or, if shorter, the life of the Fund). The table shows for the last one, five, and ten calendar year periods (or, if shorter, the life of the Fund), how the Fund’s average annual total returns compare with those of one or more broad measures of market performance.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following information provides some indication of the risks of investing in the Fund.
Performance Additional Market Index [Text] rr_PerformanceAdditionalMarketIndex The Russell 1000 Value Index is included as an additional index for the Fund as it shows how the Fund’s performance compares with the returns of an index of funds with similar investment objectives.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.PrincipalAM.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.
Bar Chart [Heading] rr_BarChartHeading Total Returns as of December 31
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
Highest return for a quarter during the period of the bar chart above:Q4 202016.32 %
Lowest return for a quarter during the period of the bar chart above:Q1 2020(26.91)%
Performance Table Heading rr_PerformanceTableHeading Average Annual Total ReturnsFor the periods ended December 31, 2023
Performance Table Market Index Changed rr_PerformanceTableMarketIndexChanged Effective March 1, 2024, the Fund changed its primary broad-based index to the Russell 1000 Index in order to meet the revised definition of “broad-based securities market index.”
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are shown for Institutional Class shares only and would be different for the other share classes.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock
After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. After-tax returns are shown for Institutional Class shares only and would be different for the other share classes.
Effective March 1, 2024, the Fund changed its primary broad-based index to the Russell 1000 Index in order to meet the revised definition of “broad-based securities market index.” The Russell 1000 Value Index is included as an additional index for the Fund as it shows how the Fund’s performance compares with the returns of an index of funds with similar investment objectives.
PFI Prospectus | LargeCap Value Fund III | Risk Lose Money [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Many factors affect that value, and it is possible to lose money by investing in the Fund.
PFI Prospectus | LargeCap Value Fund III | Risk Not Insured Depository Institution [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
PFI Prospectus | LargeCap Value Fund III | Equity Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Equity Securities Risk. A variety of factors can negatively impact the value of equity securities held by a fund, including a decline in the issuer’s financial condition, unfavorable performance of the issuer’s sector or industry, or changes in response to overall market and economic conditions. A fund’s principal market segment(s) (such as market capitalization or style) may underperform other market segments or the equity markets as a whole.
•Smaller Companies Risk. Investments in smaller companies may involve greater risk and price volatility than investments in larger, more mature companies. Smaller companies may have limited product lines, markets, or financial resources; lack the competitive strength of larger companies; have less experienced managers; or depend on a few key employees. Their securities often are less widely held and trade less frequently and in lesser quantities, and their market prices often fluctuate more, than securities of larger companies.
•Value Style Risk. Value investing entails the risk that value stocks may continue to be undervalued by the market for extended periods, including the entire period during which the stock is held by a fund, or the events that would cause the stock price to increase may not occur as anticipated or at all. Moreover, a stock that appears to be undervalued actually may be appropriately priced at a low level and, therefore, would not be profitable for the fund.
PFI Prospectus | LargeCap Value Fund III | Equity Securities Risk, Smaller Companies Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Smaller Companies Risk. Investments in smaller companies may involve greater risk and price volatility than investments in larger, more mature companies. Smaller companies may have limited product lines, markets, or financial resources; lack the competitive strength of larger companies; have less experienced managers; or depend on a few key employees. Their securities often are less widely held and trade less frequently and in lesser quantities, and their market prices often fluctuate more, than securities of larger companies.
PFI Prospectus | LargeCap Value Fund III | Equity Securities Risk, Value Style Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Value Style Risk. Value investing entails the risk that value stocks may continue to be undervalued by the market for extended periods, including the entire period during which the stock is held by a fund, or the events that would cause the stock price to increase may not occur as anticipated or at all. Moreover, a stock that appears to be undervalued actually may be appropriately priced at a low level and, therefore, would not be profitable for the fund.
PFI Prospectus | LargeCap Value Fund III | Passive Strategy Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Passive Strategy Risk. A portion of the Fund seeks to match the performance of a specified index. However, the correlation between the performance of this portion of the Fund and index performance may be affected by many factors, such as Fund expenses, the timing of cash flows into and out of the Fund, changes in securities markets, and changes in the composition of the index.
PFI Prospectus | LargeCap Value Fund III | Redemption And Large Transaction Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Redemption and Large Transaction Risk. Ownership of the Fund’s shares may be concentrated in one or a few large investors (such as funds of funds, institutional investors, and asset allocation programs) that may redeem or purchase shares in large quantities. These transactions may cause the Fund to sell securities to meet redemptions or to invest additional cash at times it would not otherwise do so, which may result in increased transaction costs, increased expenses, changes to expense ratios, and adverse effects to Fund performance. Such transactions may also accelerate the realization of taxable income if sales of portfolio securities result in gains. Moreover, reallocations by large shareholders among share classes of a fund may result in changes to the expense ratios of affected classes, which may increase the expenses paid by shareholders of the class that experienced the redemption.
PFI Prospectus | LargeCap Value Fund III | Russell 1000 Index (reflects no deduction for fees, expenses, or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
Label rr_AverageAnnualReturnLabel Russell 1000 Index (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 26.53%
5 Years rr_AverageAnnualReturnYear05 15.52%
10 Years rr_AverageAnnualReturnYear10 11.80%
PFI Prospectus | LargeCap Value Fund III | Russell 1000 Value Index (reflects no deduction for fees, expenses, or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
Label rr_AverageAnnualReturnLabel Russell 1000 Value Index (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 11.46%
5 Years rr_AverageAnnualReturnYear05 10.91%
10 Years rr_AverageAnnualReturnYear10 8.40%
PFI Prospectus | LargeCap Value Fund III | Class J  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PLVJX
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.76%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.15%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.18%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.09%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.07%) [25]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.02%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 204
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 340
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 594
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,322
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 104
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 340
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 594
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,322
Label rr_AverageAnnualReturnLabel Class J Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 8.68%
5 Years rr_AverageAnnualReturnYear05 10.80%
10 Years rr_AverageAnnualReturnYear10 8.47%
PFI Prospectus | LargeCap Value Fund III | Institutional Class  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PLVIX
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.76%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.03%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.79%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.07%) [25]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.72%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 74
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 245
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 432
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 971
Annual Return 2014 rr_AnnualReturn2014 12.40%
Annual Return 2015 rr_AnnualReturn2015 (1.86%)
Annual Return 2016 rr_AnnualReturn2016 13.17%
Annual Return 2017 rr_AnnualReturn2017 16.86%
Annual Return 2018 rr_AnnualReturn2018 (5.90%)
Annual Return 2019 rr_AnnualReturn2019 26.47%
Annual Return 2020 rr_AnnualReturn2020 3.20%
Annual Return 2021 rr_AnnualReturn2021 24.35%
Annual Return 2022 rr_AnnualReturn2022 (5.02%)
Annual Return 2023 rr_AnnualReturn2023 9.97%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Highest return for a quarter during the period of the bar chart above:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Dec. 31, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 16.32%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Lowest return for a quarter during the period of the bar chart above:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (26.91%)
Label rr_AverageAnnualReturnLabel Institutional Class Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 9.97%
5 Years rr_AverageAnnualReturnYear05 11.13%
10 Years rr_AverageAnnualReturnYear10 8.81%
PFI Prospectus | LargeCap Value Fund III | Institutional Class | After Taxes on Distributions  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Institutional Class Return After Taxes on Distributions
1 Year rr_AverageAnnualReturnYear01 9.13%
5 Years rr_AverageAnnualReturnYear05 9.54%
10 Years rr_AverageAnnualReturnYear10 7.21%
PFI Prospectus | LargeCap Value Fund III | Institutional Class | After Taxes on Distributions and Sales  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Institutional Class Return After Taxes on Distributions and Sale of Fund Shares
1 Year rr_AverageAnnualReturnYear01 6.49%
5 Years rr_AverageAnnualReturnYear05 8.67%
10 Years rr_AverageAnnualReturnYear10 6.81%
PFI Prospectus | LargeCap Value Fund III | Class R-1  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PESAX
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.76%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.35%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.54%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.65%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.07%) [25]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.58%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 161
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 514
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 890
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,949
Label rr_AverageAnnualReturnLabel Class R-1 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 9.01%
5 Years rr_AverageAnnualReturnYear05 10.17%
10 Years rr_AverageAnnualReturnYear10 7.87%
PFI Prospectus | LargeCap Value Fund III | Class R-3  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PPSFX
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.76%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.33%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.34%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.07%) [25]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.27%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 129
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 418
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 727
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,607
Label rr_AverageAnnualReturnLabel Class R-3 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 9.39%
5 Years rr_AverageAnnualReturnYear05 10.51%
10 Years rr_AverageAnnualReturnYear10 8.20%
PFI Prospectus | LargeCap Value Fund III | Class R-4  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PPSSX
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.76%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.10%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.29%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.15%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.07%) [25]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.08%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 110
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 358
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 626
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,391
Label rr_AverageAnnualReturnLabel Class R-4 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 9.55%
5 Years rr_AverageAnnualReturnYear05 10.72%
10 Years rr_AverageAnnualReturnYear10 8.41%
PFI Prospectus | LargeCap Value Fund III | Class R-5  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PPSRX
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.76%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.27%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.03%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.07%) [25]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.96%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 98
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 321
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 562
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,253
Label rr_AverageAnnualReturnLabel Class R-5 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 9.72%
5 Years rr_AverageAnnualReturnYear05 10.86%
10 Years rr_AverageAnnualReturnYear10 8.54%
PFI Prospectus | MidCap Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading MIDCAP FUND
Objective [Heading] rr_ObjectiveHeading Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The Fund seeks long-term growth of capital.
Expense [Heading] rr_ExpenseHeading Fees and Expenses of the Fund
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock
This table describes the fees and expenses that you may pay if you buy, hold, and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in Class A Shares of Principal Funds, Inc. More information about these and other discounts is available from your financial intermediary and in “Choosing a Share Class and The Costs of Investing” beginning on page 426 of the Fund’s Prospectus, Appendix B to the Prospectus titled “Intermediary-Specific Sales Charge Waivers and Reductions,” and “Multiple Class Structure” beginning on page 70 of the Fund’s Statement of Additional Information.
If you purchase Institutional Class or Class R-6 shares through certain programs offered by certain financial intermediaries, you may be required to pay a commission and/or other forms of compensation to the broker, or to your Financial Professional or other financial intermediary.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder Fees (fees paid directly from your investment)
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock
The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in Annual Fund Operating Expenses or in the Example, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 10.1% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 10.10%
Expense Breakpoint Discounts [Text] rr_ExpenseBreakpointDiscounts You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in Class A Shares of Principal Funds, Inc.
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 50,000
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example assumes conversion of the Class C shares to Class A shares after the eighth year. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, No Redemption, By Year, Caption [Text] rr_ExpenseExampleNoRedemptionByYearCaption With respect to Classes C and J shares, you would pay the following expenses if you did not redeem your shares (all other classes would be the same as in the above example):
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock Under normal circumstances, the Fund invests at least 80% of its net assets, plus any borrowings for investment purposes, in equity securities of companies with medium market capitalizations at the time of purchase. For this Fund, companies with medium market capitalizations are those with market capitalizations within the range of companies comprising the Russell MidCap® Index (as of January 31, 2024, this range was between approximately $353.3 million and $76.6 billion). The Fund also invests in foreign securities.
Strategy Portfolio Concentration [Text] rr_StrategyPortfolioConcentration Under normal circumstances, the Fund invests at least 80% of its net assets, plus any borrowings for investment purposes, in equity securities of companies with medium market capitalizations at the time of purchase.
Risk [Heading] rr_RiskHeading Principal Risks
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
The following information provides some indication of the risks of investing in the Fund. Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. You may get updated performance information at www.PrincipalAM.com.
The bar chart shows the investment returns of the Fund’s Class A shares for each full calendar year of operations for 10 years (or, if shorter, the life of the Fund). These annual returns do not reflect sales charges on Class A shares; if they did, results would be lower. The table shows for the last one, five, and ten calendar year periods (or, if shorter, the life of the Fund), how the Fund’s average annual total returns compare with those of one or more broad measures of market performance.
For periods prior to the inception date of Class R-6 shares (November 22, 2016), the performance shown in the table for Class R-6 shares is that of the Fund’s Class R-3 shares, adjusted to reflect the fees and expenses of Class R-6 shares. However, where the adjustment for fees and expenses results in performance for Class R-6 shares that is higher than the historical performance of the Class R-3 shares, the historical performance of the Class R-3 shares is used. These adjustments result in performance for such periods that is no higher than the historical performance of the Class R-3 shares.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following information provides some indication of the risks of investing in the Fund.
Performance Additional Market Index [Text] rr_PerformanceAdditionalMarketIndex The Russell MidCap Index is included as an additional index for the Fund as it shows how the Fund’s performance compares with the returns of an index of funds with similar investment objectives.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.PrincipalAM.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.
Bar Chart [Heading] rr_BarChartHeading Total Returns as of December 31
Bar Chart Does Not Reflect Sales Loads [Text] rr_BarChartDoesNotReflectSalesLoads These annual returns do not reflect sales charges on Class A shares; if they did, results would be lower.
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
Highest return for a quarter during the period of the bar chart above:Q2 202024.72 %
Lowest return for a quarter during the period of the bar chart above:Q1 2020(23.89)%
Performance Table Heading rr_PerformanceTableHeading Average Annual Total ReturnsFor the periods ended December 31, 2023
Performance Table Market Index Changed rr_PerformanceTableMarketIndexChanged Effective March 1, 2024, the Fund changed its primary broad-based index to the Russell 3000 Index in order to meet the revised definition of “broad-based securities market index.”
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are shown for Class A shares only and would be different for the other share classes.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock
After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. After-tax returns are shown for Class A shares only and would be different for the other share classes.
Effective March 1, 2024, the Fund changed its primary broad-based index to the Russell 3000 Index in order to meet the revised definition of “broad-based securities market index.” The Russell MidCap Index is included as an additional index for the Fund as it shows how the Fund’s performance compares with the returns of an index of funds with similar investment objectives.
PFI Prospectus | MidCap Fund | Risk Lose Money [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Many factors affect that value, and it is possible to lose money by investing in the Fund.
PFI Prospectus | MidCap Fund | Risk Not Insured Depository Institution [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
PFI Prospectus | MidCap Fund | Equity Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Equity Securities Risk. A variety of factors can negatively impact the value of equity securities held by a fund, including a decline in the issuer’s financial condition, unfavorable performance of the issuer’s sector or industry, or changes in response to overall market and economic conditions. A fund’s principal market segment(s) (such as market capitalization or style) may underperform other market segments or the equity markets as a whole.
•Smaller Companies Risk. Investments in smaller companies may involve greater risk and price volatility than investments in larger, more mature companies. Smaller companies may have limited product lines, markets, or financial resources; lack the competitive strength of larger companies; have less experienced managers; or depend on a few key employees. Their securities often are less widely held and trade less frequently and in lesser quantities, and their market prices often fluctuate more, than securities of larger companies.
PFI Prospectus | MidCap Fund | Equity Securities Risk, Smaller Companies Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Smaller Companies Risk. Investments in smaller companies may involve greater risk and price volatility than investments in larger, more mature companies. Smaller companies may have limited product lines, markets, or financial resources; lack the competitive strength of larger companies; have less experienced managers; or depend on a few key employees. Their securities often are less widely held and trade less frequently and in lesser quantities, and their market prices often fluctuate more, than securities of larger companies.
PFI Prospectus | MidCap Fund | Foreign Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Foreign Securities Risk. The risks of foreign securities include loss of value as a result of: political or economic instability; nationalization, expropriation, or confiscatory taxation; settlement delays; and limited government regulation (including less stringent reporting, accounting, and disclosure standards than are required of U.S. companies).
PFI Prospectus | MidCap Fund | Redemption And Large Transaction Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Redemption and Large Transaction Risk. Ownership of the Fund’s shares may be concentrated in one or a few large investors (such as funds of funds, institutional investors, and asset allocation programs) that may redeem or purchase shares in large quantities. These transactions may cause the Fund to sell securities to meet redemptions or to invest additional cash at times it would not otherwise do so, which may result in increased transaction costs, increased expenses, changes to expense ratios, and adverse effects to Fund performance. Such transactions may also accelerate the realization of taxable income if sales of portfolio securities result in gains. Moreover, reallocations by large shareholders among share classes of a fund may result in changes to the expense ratios of affected classes, which may increase the expenses paid by shareholders of the class that experienced the redemption.
PFI Prospectus | MidCap Fund | Russell 3000 Index (reflects no deduction for fees, expenses, or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
Label rr_AverageAnnualReturnLabel Russell 3000 Index (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 25.96%
5 Years rr_AverageAnnualReturnYear05 15.16%
10 Years rr_AverageAnnualReturnYear10 11.48%
PFI Prospectus | MidCap Fund | Russell MidCap Index (reflects no deduction for fees, expenses, or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
Label rr_AverageAnnualReturnLabel Russell MidCap Index (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 17.23%
5 Years rr_AverageAnnualReturnYear05 12.68%
10 Years rr_AverageAnnualReturnYear10 9.42%
PFI Prospectus | MidCap Fund | Class A  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PEMGX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 5.50%
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.58%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.12%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.95%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 642
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 836
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,047
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,652
Annual Return 2014 rr_AnnualReturn2014 12.33%
Annual Return 2015 rr_AnnualReturn2015 1.13%
Annual Return 2016 rr_AnnualReturn2016 9.93%
Annual Return 2017 rr_AnnualReturn2017 24.93%
Annual Return 2018 rr_AnnualReturn2018 (6.93%)
Annual Return 2019 rr_AnnualReturn2019 42.48%
Annual Return 2020 rr_AnnualReturn2020 17.96%
Annual Return 2021 rr_AnnualReturn2021 24.97%
Annual Return 2022 rr_AnnualReturn2022 (23.37%)
Annual Return 2023 rr_AnnualReturn2023 25.55%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Highest return for a quarter during the period of the bar chart above:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 24.72%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Lowest return for a quarter during the period of the bar chart above:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (23.89%)
Label rr_AverageAnnualReturnLabel Class A Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 18.63%
5 Years rr_AverageAnnualReturnYear05 13.81%
10 Years rr_AverageAnnualReturnYear10 10.73%
PFI Prospectus | MidCap Fund | Class A | After Taxes on Distributions  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Class A Return After Taxes on Distributions
1 Year rr_AverageAnnualReturnYear01 17.91%
5 Years rr_AverageAnnualReturnYear05 12.77%
10 Years rr_AverageAnnualReturnYear10 9.51%
PFI Prospectus | MidCap Fund | Class A | After Taxes on Distributions and Sales  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Class A Return After Taxes on Distributions and Sale of Fund Shares
1 Year rr_AverageAnnualReturnYear01 11.53%
5 Years rr_AverageAnnualReturnYear05 11.01%
10 Years rr_AverageAnnualReturnYear10 8.52%
PFI Prospectus | MidCap Fund | Class C  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PMBCX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.58%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.20%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.78%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 281
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 560
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 964
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,876
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 181
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 560
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 964
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,876
Label rr_AverageAnnualReturnLabel Class C Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 23.51%
5 Years rr_AverageAnnualReturnYear05 14.23%
10 Years rr_AverageAnnualReturnYear10 10.71%
PFI Prospectus | MidCap Fund | Class J  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PMBJX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.58%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.15%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.09%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.82%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 184
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 262
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 455
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,014
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 84
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 262
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 455
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,014
Label rr_AverageAnnualReturnLabel Class J Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 24.70%
5 Years rr_AverageAnnualReturnYear05 15.29%
10 Years rr_AverageAnnualReturnYear10 11.53%
PFI Prospectus | MidCap Fund | Institutional Class  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PCBIX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.58%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.10%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.68%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 69
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 218
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 379
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 847
Label rr_AverageAnnualReturnLabel Institutional Class Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 25.87%
5 Years rr_AverageAnnualReturnYear05 15.41%
10 Years rr_AverageAnnualReturnYear10 11.68%
PFI Prospectus | MidCap Fund | Class R-1  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PMSBX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.58%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.35%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.53%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.46%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 149
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 462
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 797
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,746
Label rr_AverageAnnualReturnLabel Class R-1 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 24.89%
5 Years rr_AverageAnnualReturnYear05 14.51%
10 Years rr_AverageAnnualReturnYear10 10.81%
PFI Prospectus | MidCap Fund | Class R-3  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PMBMX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.58%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.32%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.15%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 117
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 365
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 633
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,398
Label rr_AverageAnnualReturnLabel Class R-3 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 25.30%
5 Years rr_AverageAnnualReturnYear05 14.87%
10 Years rr_AverageAnnualReturnYear10 11.16%
PFI Prospectus | MidCap Fund | Class R-4  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PMBSX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.58%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.10%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.28%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.96%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 98
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 306
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 531
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,178
Label rr_AverageAnnualReturnLabel Class R-4 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 25.53%
5 Years rr_AverageAnnualReturnYear05 15.09%
10 Years rr_AverageAnnualReturnYear10 11.36%
PFI Prospectus | MidCap Fund | Class R-5  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PMBPX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.58%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.26%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.84%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 86
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 268
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 466
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,037
Label rr_AverageAnnualReturnLabel Class R-5 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 25.65%
5 Years rr_AverageAnnualReturnYear05 15.23%
10 Years rr_AverageAnnualReturnYear10 11.50%
PFI Prospectus | MidCap Fund | Class R-6  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PMAQX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.58%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.02%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.60%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 61
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 192
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 335
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 750
Label rr_AverageAnnualReturnLabel Class R-6 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 25.97%
5 Years rr_AverageAnnualReturnYear05 15.52%
10 Years rr_AverageAnnualReturnYear10 11.59%
PFI Prospectus | MidCap Growth Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading MIDCAP GROWTH FUND
Objective [Heading] rr_ObjectiveHeading Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The Fund seeks long-term growth of capital.
Expense [Heading] rr_ExpenseHeading Fees and Expenses of the Fund
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock
This table describes the fees and expenses that you may pay if you buy, hold, and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below.
If you purchase Institutional Class shares through certain programs offered by certain financial intermediaries, you may be required to pay a commission and/or other forms of compensation to the broker, or to your Financial Professional or other financial intermediary.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder Fees (fees paid directly from your investment)
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination February 28, 2025
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock
The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in Annual Fund Operating Expenses or in the Example, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 181.4% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 181.40%
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. The calculation of costs takes into account any applicable contractual fee waivers and/or expense reimbursements for the period noted in the table above. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, No Redemption, By Year, Caption [Text] rr_ExpenseExampleNoRedemptionByYearCaption With respect to Class J shares, you would pay the following expenses if you did not redeem your shares (all other classes would be the same as in the above example):
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
Under normal circumstances, the Fund invests at least 80% of its net assets, plus any borrowings for investment purposes, in equity securities of companies with medium market capitalizations at the time of purchase. For this Fund, companies with medium market capitalizations are those with market capitalizations within the range of companies comprising the Russell MidCap® Growth Index (as of January 31, 2024, this range was between approximately $684.1 million and $76.6 billion). The Fund invests in growth equity securities, an investment strategy that emphasizes buying equity securities of companies whose potential for growth of capital and earnings is expected to be above average. The Fund’s strategies may result in the active and frequent trading of the Fund’s portfolio securities.
Strategy Portfolio Concentration [Text] rr_StrategyPortfolioConcentration Under normal circumstances, the Fund invests at least 80% of its net assets, plus any borrowings for investment purposes, in equity securities of companies with medium market capitalizations at the time of purchase.
Risk [Heading] rr_RiskHeading Principal Risks
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
The following information provides some indication of the risks of investing in the Fund. Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. You may get updated performance information at www.PrincipalAM.com.
The bar chart shows the investment returns of the Fund’s Institutional Class shares for each full calendar year of operations for 10 years (or, if shorter, the life of the Fund). The table shows for the last one, five, and ten calendar year periods (or, if shorter, the life of the Fund), how the Fund’s average annual total returns compare with those of one or more broad measures of market performance.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following information provides some indication of the risks of investing in the Fund.
Performance Additional Market Index [Text] rr_PerformanceAdditionalMarketIndex The Russell MidCap Growth Index is included as an additional index for the Fund as it shows how the Fund’s performance compares with the returns of an index of funds with similar investment objectives.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.PrincipalAM.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.
Bar Chart [Heading] rr_BarChartHeading Total Returns as of December 31
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
Highest return for a quarter during the period of the bar chart above:Q2 202038.05 %
Lowest return for a quarter during the period of the bar chart above:Q4 2018(22.62)%
Performance Table Heading rr_PerformanceTableHeading Average Annual Total ReturnsFor the periods ended December 31, 2023
Performance Table Market Index Changed rr_PerformanceTableMarketIndexChanged Effective March 1, 2024, the Fund changed its primary broad-based index to the Russell 3000 Index in order to meet the revised definition of “broad-based securities market index.”
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are shown for Institutional Class shares only and would be different for the other share classes.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock
After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. After-tax returns are shown for Institutional Class shares only and would be different for the other share classes.
Effective March 1, 2024, the Fund changed its primary broad-based index to the Russell 3000 Index in order to meet the revised definition of “broad-based securities market index.” The Russell MidCap Growth Index is included as an additional index for the Fund as it shows how the Fund’s performance compares with the returns of an index of funds with similar investment objectives.
PFI Prospectus | MidCap Growth Fund | Risk Lose Money [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Many factors affect that value, and it is possible to lose money by investing in the Fund.
PFI Prospectus | MidCap Growth Fund | Risk Not Insured Depository Institution [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
PFI Prospectus | MidCap Growth Fund | Equity Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Equity Securities Risk. A variety of factors can negatively impact the value of equity securities held by a fund, including a decline in the issuer’s financial condition, unfavorable performance of the issuer’s sector or industry, or changes in response to overall market and economic conditions. A fund’s principal market segment(s) (such as market capitalization or style) may underperform other market segments or the equity markets as a whole.
•Growth Style Risk. Growth investing entails the risk that if growth companies do not increase their earnings at a rate expected by investors, the market price of their stock may decline significantly, even if earnings show an absolute increase. Growth company stocks also typically lack the dividend yield that can lessen price declines in market downturns.
•Smaller Companies Risk. Investments in smaller companies may involve greater risk and price volatility than investments in larger, more mature companies. Smaller companies may have limited product lines, markets, or financial resources; lack the competitive strength of larger companies; have less experienced managers; or depend on a few key employees. Their securities often are less widely held and trade less frequently and in lesser quantities, and their market prices often fluctuate more, than securities of larger companies.
PFI Prospectus | MidCap Growth Fund | Equity Securities Risk, Growth Style Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Growth Style Risk. Growth investing entails the risk that if growth companies do not increase their earnings at a rate expected by investors, the market price of their stock may decline significantly, even if earnings show an absolute increase. Growth company stocks also typically lack the dividend yield that can lessen price declines in market downturns.
PFI Prospectus | MidCap Growth Fund | Equity Securities Risk, Smaller Companies Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Smaller Companies Risk. Investments in smaller companies may involve greater risk and price volatility than investments in larger, more mature companies. Smaller companies may have limited product lines, markets, or financial resources; lack the competitive strength of larger companies; have less experienced managers; or depend on a few key employees. Their securities often are less widely held and trade less frequently and in lesser quantities, and their market prices often fluctuate more, than securities of larger companies.
PFI Prospectus | MidCap Growth Fund | High Portfolio Turnover Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock High Portfolio Turnover Risk. High portfolio turnover (more than 100%) caused by active and frequent trading of portfolio securities may result in accelerating the realization of taxable gains and losses, lower fund performance, and increased brokerage costs.
PFI Prospectus | MidCap Growth Fund | Redemption And Large Transaction Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Redemption and Large Transaction Risk. Ownership of the Fund’s shares may be concentrated in one or a few large investors (such as funds of funds, institutional investors, and asset allocation programs) that may redeem or purchase shares in large quantities. These transactions may cause the Fund to sell securities to meet redemptions or to invest additional cash at times it would not otherwise do so, which may result in increased transaction costs, increased expenses, changes to expense ratios, and adverse effects to Fund performance. Such transactions may also accelerate the realization of taxable income if sales of portfolio securities result in gains. Moreover, reallocations by large shareholders among share classes of a fund may result in changes to the expense ratios of affected classes, which may increase the expenses paid by shareholders of the class that experienced the redemption.
PFI Prospectus | MidCap Growth Fund | Russell 3000 Index (reflects no deduction for fees, expenses, or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
Label rr_AverageAnnualReturnLabel Russell 3000 Index (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 25.96%
5 Years rr_AverageAnnualReturnYear05 15.16%
10 Years rr_AverageAnnualReturnYear10 11.48%
PFI Prospectus | MidCap Growth Fund | Russell MidCap Growth Index (reflects no deduction for fees, expenses, or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
Label rr_AverageAnnualReturnLabel Russell MidCap Growth Index (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 25.87%
5 Years rr_AverageAnnualReturnYear05 13.81%
10 Years rr_AverageAnnualReturnYear10 10.57%
PFI Prospectus | MidCap Growth Fund | Class J  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PMGJX
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.65%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.15%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.15%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.95%
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.95%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 197
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 303
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 525
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,166
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 97
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 303
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 525
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,166
Label rr_AverageAnnualReturnLabel Class J Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 12.64%
5 Years rr_AverageAnnualReturnYear05 13.18%
10 Years rr_AverageAnnualReturnYear10 9.75%
PFI Prospectus | MidCap Growth Fund | Institutional Class  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PGWIX
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.65%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.14%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.79%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.04%) [26]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.75%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 77
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 248
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 435
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 974
Annual Return 2014 rr_AnnualReturn2014 12.00%
Annual Return 2015 rr_AnnualReturn2015 2.22%
Annual Return 2016 rr_AnnualReturn2016 3.12%
Annual Return 2017 rr_AnnualReturn2017 29.03%
Annual Return 2018 rr_AnnualReturn2018 (8.99%)
Annual Return 2019 rr_AnnualReturn2019 31.50%
Annual Return 2020 rr_AnnualReturn2020 61.15%
Annual Return 2021 rr_AnnualReturn2021 14.73%
Annual Return 2022 rr_AnnualReturn2022 (32.28%)
Annual Return 2023 rr_AnnualReturn2023 13.83%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Highest return for a quarter during the period of the bar chart above:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 38.05%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Lowest return for a quarter during the period of the bar chart above:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2018
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (22.62%)
Label rr_AverageAnnualReturnLabel Institutional Class Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 13.83%
5 Years rr_AverageAnnualReturnYear05 13.38%
10 Years rr_AverageAnnualReturnYear10 10.02%
PFI Prospectus | MidCap Growth Fund | Institutional Class | After Taxes on Distributions  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Institutional Class Return After Taxes on Distributions
1 Year rr_AverageAnnualReturnYear01 13.83%
5 Years rr_AverageAnnualReturnYear05 11.62%
10 Years rr_AverageAnnualReturnYear10 7.83%
PFI Prospectus | MidCap Growth Fund | Institutional Class | After Taxes on Distributions and Sales  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Institutional Class Return After Taxes on Distributions and Sale of Fund Shares
1 Year rr_AverageAnnualReturnYear01 8.18%
5 Years rr_AverageAnnualReturnYear05 10.66%
10 Years rr_AverageAnnualReturnYear10 7.49%
PFI Prospectus | MidCap Growth Fund | Class R-1  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PMSGX
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.65%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.35%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.55%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.55%
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.55%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 158
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 490
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 845
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,845
Label rr_AverageAnnualReturnLabel Class R-1 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 12.91%
5 Years rr_AverageAnnualReturnYear05 12.45%
10 Years rr_AverageAnnualReturnYear10 9.13%
PFI Prospectus | MidCap Growth Fund | Class R-3  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PFPPX
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.65%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.34%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.24%
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.24%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 126
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 393
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 681
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,500
Label rr_AverageAnnualReturnLabel Class R-3 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 13.26%
5 Years rr_AverageAnnualReturnYear05 12.80%
10 Years rr_AverageAnnualReturnYear10 9.47%
PFI Prospectus | MidCap Growth Fund | Class R-4  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PIPPX
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.65%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.10%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.30%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.05%
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.05%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 107
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 334
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 579
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,283
Label rr_AverageAnnualReturnLabel Class R-4 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 13.48%
5 Years rr_AverageAnnualReturnYear05 13.02%
10 Years rr_AverageAnnualReturnYear10 9.68%
PFI Prospectus | MidCap Growth Fund | Class R-5  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PHPPX
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.65%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.28%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.93%
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.93%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 95
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 296
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 515
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,143
Label rr_AverageAnnualReturnLabel Class R-5 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 13.55%
5 Years rr_AverageAnnualReturnYear05 13.13%
10 Years rr_AverageAnnualReturnYear10 9.80%
PFI Prospectus | MidCap Growth Fund III  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading MIDCAP GROWTH FUND III
Objective [Heading] rr_ObjectiveHeading Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The Fund seeks long-term growth of capital.
Expense [Heading] rr_ExpenseHeading Fees and Expenses of the Fund
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock
This table describes the fees and expenses that you may pay if you buy, hold, and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below.
If you purchase Institutional Class shares through certain programs offered by certain financial intermediaries, you may be required to pay a commission and/or other forms of compensation to the broker, or to your Financial Professional or other financial intermediary.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder Fees (fees paid directly from your investment)
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination February 28 2025
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock
The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in Annual Fund Operating Expenses or in the Example, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 49.4% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 49.40%
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. The calculation of costs takes into account any applicable contractual fee waivers and/or expense reimbursements for the period noted in the table above. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, No Redemption, By Year, Caption [Text] rr_ExpenseExampleNoRedemptionByYearCaption With respect to Class J shares, you would pay the following expenses if you did not redeem your shares (all other classes would be the same as in the above example):
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
Under normal circumstances, the Fund invests at least 80% of its net assets, plus any borrowings for investment purposes, in equity securities of companies with medium market capitalizations at the time of purchase. For this Fund, companies with medium market capitalizations are those with market capitalizations within the range of companies comprising the Russell MidCap® Growth Index (as of January 31, 2024, this range was between approximately $684.1 million and $76.6 billion). The Fund invests in growth equity securities, an investment strategy that emphasizes buying equity securities of companies whose potential for growth of capital and earnings is expected to be above average.
The Fund is primarily actively managed by the sub-advisors. In addition, Principal Global Investors, LLC may invest up to 30% of the Fund’s assets using an index sampling strategy designed to match the performance of the Russell MidCap® Growth Index.
Strategy Portfolio Concentration [Text] rr_StrategyPortfolioConcentration Under normal circumstances, the Fund invests at least 80% of its net assets, plus any borrowings for investment purposes, in equity securities of companies with medium market capitalizations at the time of purchase.
Risk [Heading] rr_RiskHeading Principal Risks
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
The following information provides some indication of the risks of investing in the Fund. Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. You may get updated performance information at www.PrincipalAM.com.
The bar chart shows the investment returns of the Fund’s Institutional Class shares for each full calendar year of operations for 10 years (or, if shorter, the life of the Fund). The table shows for the last one, five, and ten calendar year periods (or, if shorter, the life of the Fund), how the Fund’s average annual total returns compare with those of one or more broad measures of market performance.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following information provides some indication of the risks of investing in the Fund.
Performance Additional Market Index [Text] rr_PerformanceAdditionalMarketIndex The Russell MidCap Growth Index is included as an additional index for the Fund as it shows how the Fund’s performance compares with the returns of an index of funds with similar investment objectives.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.PrincipalAM.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.
Bar Chart [Heading] rr_BarChartHeading Total Returns as of December 31
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
Highest return for a quarter during the period of the bar chart above:
Q2 202030.62 %
Lowest return for a quarter during the period of the bar chart above:
Q1 2020(20.02)%
Performance Table Heading rr_PerformanceTableHeading Average Annual Total ReturnsFor the periods ended December 31, 2023
Performance Table Market Index Changed rr_PerformanceTableMarketIndexChanged Effective March 1, 2024, the Fund changed its primary broad-based index to the Russell 3000 Index in order to meet the revised definition of “broad-based securities market index.”
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are shown for Institutional Class shares only and would be different for the other share classes.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock
After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. After-tax returns are shown for Institutional Class shares only and would be different for the other share classes.
Effective March 1, 2024, the Fund changed its primary broad-based index to the Russell 3000 Index in order to meet the revised definition of “broad-based securities market index.” The Russell MidCap Growth Index is included as an additional index for the Fund as it shows how the Fund’s performance compares with the returns of an index of funds with similar investment objectives.
PFI Prospectus | MidCap Growth Fund III | Risk Lose Money [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Many factors affect that value, and it is possible to lose money by investing in the Fund.
PFI Prospectus | MidCap Growth Fund III | Risk Not Insured Depository Institution [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
PFI Prospectus | MidCap Growth Fund III | Equity Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Equity Securities Risk. A variety of factors can negatively impact the value of equity securities held by a fund, including a decline in the issuer’s financial condition, unfavorable performance of the issuer’s sector or industry, or changes in response to overall market and economic conditions. A fund’s principal market segment(s) (such as market capitalization or style) may underperform other market segments or the equity markets as a whole.
•Growth Style Risk. Growth investing entails the risk that if growth companies do not increase their earnings at a rate expected by investors, the market price of their stock may decline significantly, even if earnings show an absolute increase. Growth company stocks also typically lack the dividend yield that can lessen price declines in market downturns.
•Smaller Companies Risk. Investments in smaller companies may involve greater risk and price volatility than investments in larger, more mature companies. Smaller companies may have limited product lines, markets, or financial resources; lack the competitive strength of larger companies; have less experienced managers; or depend on a few key employees. Their securities often are less widely held and trade less frequently and in lesser quantities, and their market prices often fluctuate more, than securities of larger companies.
PFI Prospectus | MidCap Growth Fund III | Equity Securities Risk, Growth Style Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Growth Style Risk. Growth investing entails the risk that if growth companies do not increase their earnings at a rate expected by investors, the market price of their stock may decline significantly, even if earnings show an absolute increase. Growth company stocks also typically lack the dividend yield that can lessen price declines in market downturns.
PFI Prospectus | MidCap Growth Fund III | Equity Securities Risk, Smaller Companies Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Smaller Companies Risk. Investments in smaller companies may involve greater risk and price volatility than investments in larger, more mature companies. Smaller companies may have limited product lines, markets, or financial resources; lack the competitive strength of larger companies; have less experienced managers; or depend on a few key employees. Their securities often are less widely held and trade less frequently and in lesser quantities, and their market prices often fluctuate more, than securities of larger companies.
PFI Prospectus | MidCap Growth Fund III | Passive Strategy Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Passive Strategy Risk. A portion of the Fund seeks to match the performance of a specified index. However, the correlation between the performance of this portion of the Fund and index performance may be affected by many factors, such as Fund expenses, the timing of cash flows into and out of the Fund, changes in securities markets, and changes in the composition of the index.
PFI Prospectus | MidCap Growth Fund III | Redemption And Large Transaction Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Redemption and Large Transaction Risk. Ownership of the Fund’s shares may be concentrated in one or a few large investors (such as funds of funds, institutional investors, and asset allocation programs) that may redeem or purchase shares in large quantities. These transactions may cause the Fund to sell securities to meet redemptions or to invest additional cash at times it would not otherwise do so, which may result in increased transaction costs, increased expenses, changes to expense ratios, and adverse effects to Fund performance. Such transactions may also accelerate the realization of taxable income if sales of portfolio securities result in gains. Moreover, reallocations by large shareholders among share classes of a fund may result in changes to the expense ratios of affected classes, which may increase the expenses paid by shareholders of the class that experienced the redemption.
PFI Prospectus | MidCap Growth Fund III | Russell 3000 Index (reflects no deduction for fees, expenses, or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
Label rr_AverageAnnualReturnLabel Russell 3000 Index (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 25.96%
5 Years rr_AverageAnnualReturnYear05 15.16%
10 Years rr_AverageAnnualReturnYear10 11.48%
PFI Prospectus | MidCap Growth Fund III | Russell MidCap Growth Index (reflects no deduction for fees, expenses, or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
Label rr_AverageAnnualReturnLabel Russell MidCap Growth Index (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 25.87%
5 Years rr_AverageAnnualReturnYear05 13.81%
10 Years rr_AverageAnnualReturnYear10 10.57%
PFI Prospectus | MidCap Growth Fund III | Class J  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PPQJX
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.81%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.15%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.21%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.17%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.02%) [27]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.15%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 217
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 370
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 642
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,419
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 117
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 370
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 642
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,419
Label rr_AverageAnnualReturnLabel Class J Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 19.14%
5 Years rr_AverageAnnualReturnYear05 13.27%
10 Years rr_AverageAnnualReturnYear10 9.16%
PFI Prospectus | MidCap Growth Fund III | Institutional Class  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PPIMX
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.81%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.01%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.82%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.02%) [27]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.80%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 82
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 260
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 453
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,012
Annual Return 2014 rr_AnnualReturn2014 7.38%
Annual Return 2015 rr_AnnualReturn2015 (1.77%)
Annual Return 2016 rr_AnnualReturn2016 4.50%
Annual Return 2017 rr_AnnualReturn2017 24.59%
Annual Return 2018 rr_AnnualReturn2018 (4.45%)
Annual Return 2019 rr_AnnualReturn2019 35.40%
Annual Return 2020 rr_AnnualReturn2020 36.44%
Annual Return 2021 rr_AnnualReturn2021 16.10%
Annual Return 2022 rr_AnnualReturn2022 (26.73%)
Annual Return 2023 rr_AnnualReturn2023 20.59%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Highest return for a quarter during the period of the bar chart above:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 30.62%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Lowest return for a quarter during the period of the bar chart above:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (20.02%)
Label rr_AverageAnnualReturnLabel Institutional Class Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 20.59%
5 Years rr_AverageAnnualReturnYear05 13.64%
10 Years rr_AverageAnnualReturnYear10 9.54%
PFI Prospectus | MidCap Growth Fund III | Institutional Class | After Taxes on Distributions  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Institutional Class Return After Taxes on Distributions
1 Year rr_AverageAnnualReturnYear01 18.65%
5 Years rr_AverageAnnualReturnYear05 11.25%
10 Years rr_AverageAnnualReturnYear10 6.87%
PFI Prospectus | MidCap Growth Fund III | Institutional Class | After Taxes on Distributions and Sales  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Institutional Class Return After Taxes on Distributions and Sale of Fund Shares
1 Year rr_AverageAnnualReturnYear01 13.51%
5 Years rr_AverageAnnualReturnYear05 10.76%
10 Years rr_AverageAnnualReturnYear10 6.96%
PFI Prospectus | MidCap Growth Fund III | Class R-1  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PHASX
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.81%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.35%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.54%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.70%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.02%) [27]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.68%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 171
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 534
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 921
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 2,007
Label rr_AverageAnnualReturnLabel Class R-1 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 19.65%
5 Years rr_AverageAnnualReturnYear05 12.65%
10 Years rr_AverageAnnualReturnYear10 8.58%
PFI Prospectus | MidCap Growth Fund III | Class R-3  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PPQMX
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.81%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.33%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.39%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.02%) [27]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.37%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 139
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 438
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 759
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,667
Label rr_AverageAnnualReturnLabel Class R-3 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 20.03%
5 Years rr_AverageAnnualReturnYear05 13.00%
10 Years rr_AverageAnnualReturnYear10 8.92%
PFI Prospectus | MidCap Growth Fund III | Class R-4  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PPQSX
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.81%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.10%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.29%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.20%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.02%) [27]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.18%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 120
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 379
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 658
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,453
Label rr_AverageAnnualReturnLabel Class R-4 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 20.18%
5 Years rr_AverageAnnualReturnYear05 13.22%
10 Years rr_AverageAnnualReturnYear10 9.13%
PFI Prospectus | MidCap Growth Fund III | Class R-5  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PPQPX
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.81%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.27%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.08%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.02%) [27]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.06%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 108
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 341
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 594
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,315
Label rr_AverageAnnualReturnLabel Class R-5 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 20.30%
5 Years rr_AverageAnnualReturnYear05 13.33%
10 Years rr_AverageAnnualReturnYear10 9.26%
PFI Prospectus | MidCap S&P 400 Index Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading MIDCAP S&P 400 INDEX FUND
Objective [Heading] rr_ObjectiveHeading Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The Fund seeks long-term growth of capital.
Expense [Heading] rr_ExpenseHeading Fees and Expenses of the Fund
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock
This table describes the fees and expenses that you may pay if you buy, hold, and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below.
If you purchase Institutional Class or Class R-6 shares through certain programs offered by certain financial intermediaries, you may be required to pay a commission and/or other forms of compensation to the broker, or to your Financial Professional or other financial intermediary.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder Fees (fees paid directly from your investment)
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock
The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in Annual Fund Operating Expenses or in the Example, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 20.4% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 20.40%
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, No Redemption, By Year, Caption [Text] rr_ExpenseExampleNoRedemptionByYearCaption With respect to Class J shares, you would pay the following expenses if you did not redeem your shares (all other classes would be the same as in the above example):
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
Under normal circumstances, the Fund invests at least 80% of its net assets, plus any borrowings for investment purposes, in equity securities of companies that compose the Standard & Poor’s (“S&P”) MidCap 400 Index (the “Index”) at the time of purchase. The Index is designed to represent U.S. equities with risk/return characteristics of the mid cap universe. As of January 31, 2024, the market capitalization range of the companies comprising the Index was between approximately $1.4 billion and $28.2 billion. Each component stock of the Index is weighted in proportion to its total market value. The Index is rebalanced quarterly.
The Fund employs a passive investment approach designed to attempt to track the performance of the Index. In seeking its objective, the Fund typically employs a replication strategy, which involves investing in all the securities that make up the Index, in the same proportions as the Index.
The Fund uses derivative strategies and invests in exchange-traded funds (“ETFs”). A derivative is a financial arrangement, the value of which is derived from, or based on, a traditional security, asset, or market index. Specifically, the Fund invests in index futures and equity ETFs on a daily basis to gain exposure to the Index in an effort to minimize tracking error relative to the benchmark.
The Fund will not concentrate (i.e., invest more than 25% of its assets) its investments in a particular industry except to the extent the Index is so concentrated. As of January 31, 2024, the Index was not concentrated in any industry.
Note:    “Standard & Poor’s MidCap 400” and “S&P MidCap 400” are trademarks of S&P Global and have been licensed by Principal. The Fund is not sponsored, endorsed, sold, or promoted by S&P Global, and S&P Global makes no representation regarding the advisability of investing in the Fund.
Strategy Portfolio Concentration [Text] rr_StrategyPortfolioConcentration Under normal circumstances, the Fund invests at least 80% of its net assets, plus any borrowings for investment purposes, in equity securities of companies that compose the Standard & Poor’s (“S&P”) MidCap 400 Index (the “Index”) at the time of purchase.
Risk [Heading] rr_RiskHeading Principal Risks
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
The following information provides some indication of the risks of investing in the Fund. Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. You may get updated performance information at www.PrincipalAM.com.
The bar chart shows the investment returns of the Fund’s Institutional Class shares for each full calendar year of operations for 10 years (or, if shorter, the life of the Fund). The table shows for the last one, five, and ten calendar year periods (or, if shorter, the life of the Fund), how the Fund’s average annual total returns compare with those of one or more broad measures of market performance.
For periods prior to the inception date of Class R-6 shares (November 22, 2016), the performance shown in the table for Class R-6 shares is that of the Fund’s Class R-3 shares, adjusted to reflect the fees and expenses of Class R-6 shares. However, where the adjustment for fees and expenses results in performance for Class R-6 shares that is higher than the historical performance of the Class R-3 shares, the historical performance of the Class R-3 shares is used. These adjustments result in performance for such periods that is no higher than the historical performance of the Class R-3 shares.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following information provides some indication of the risks of investing in the Fund.
Performance Additional Market Index [Text] rr_PerformanceAdditionalMarketIndex The S&P MidCap 400 Index is included as an additional index for the Fund as it shows how the Fund’s performance compares with the returns of an index of funds with similar investment objectives.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.PrincipalAM.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.
Bar Chart [Heading] rr_BarChartHeading Total Returns as of December 31
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
Highest return for a quarter during the period of the bar chart above:Q4 202024.32 %
Lowest return for a quarter during the period of the bar chart above:Q1 2020(29.79)%
Performance Table Heading rr_PerformanceTableHeading Average Annual Total ReturnsFor the periods ended December 31, 2023
Performance Table Market Index Changed rr_PerformanceTableMarketIndexChanged Effective March 1, 2024, the Fund changed its primary broad-based index to the S&P 1500 TR in order to meet the revised definition of “broad-based securities market index.”
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are shown for Institutional Class shares only and would be different for the other share classes.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock
After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. After-tax returns are shown for Institutional Class shares only and would be different for the other share classes.
Effective March 1, 2024, the Fund changed its primary broad-based index to the S&P 1500 TR in order to meet the revised definition of “broad-based securities market index.” The S&P MidCap 400 Index is included as an additional index for the Fund as it shows how the Fund’s performance compares with the returns of an index of funds with similar investment objectives.
PFI Prospectus | MidCap S&P 400 Index Fund | Risk Lose Money [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Many factors affect that value, and it is possible to lose money by investing in the Fund.
PFI Prospectus | MidCap S&P 400 Index Fund | Risk Not Insured Depository Institution [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
PFI Prospectus | MidCap S&P 400 Index Fund | Derivatives Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Derivatives Risk. Derivatives may not move in the direction anticipated by the portfolio manager. Transactions in derivatives may increase volatility, cause the liquidation of portfolio positions when not advantageous to do so, and result in disproportionate losses that may be substantially greater than a fund’s initial investment.
•Futures. Futures contracts involve specific risks, including: the imperfect correlation between the change in market value of the instruments held by the Fund and the price of the futures contract; possible lack of a liquid secondary market for a futures contract and the resulting inability to close a futures contract when desired; counterparty risk; and if the Fund has insufficient cash, it may have to sell securities from its portfolio to meet daily variation margin requirements.
PFI Prospectus | MidCap S&P 400 Index Fund | Derivatives Risk, Futures Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Futures. Futures contracts involve specific risks, including: the imperfect correlation between the change in market value of the instruments held by the Fund and the price of the futures contract; possible lack of a liquid secondary market for a futures contract and the resulting inability to close a futures contract when desired; counterparty risk; and if the Fund has insufficient cash, it may have to sell securities from its portfolio to meet daily variation margin requirements.
PFI Prospectus | MidCap S&P 400 Index Fund | Equity Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Equity Securities Risk. A variety of factors can negatively impact the value of equity securities held by a fund, including a decline in the issuer’s financial condition, unfavorable performance of the issuer’s sector or industry, or changes in response to overall market and economic conditions. A fund’s principal market segment(s) (such as market capitalization or style) may underperform other market segments or the equity markets as a whole.
•Smaller Companies Risk. Investments in smaller companies may involve greater risk and price volatility than investments in larger, more mature companies. Smaller companies may have limited product lines, markets, or financial resources; lack the competitive strength of larger companies; have less experienced managers; or depend on a few key employees. Their securities often are less widely held and trade less frequently and in lesser quantities, and their market prices often fluctuate more, than securities of larger companies.
PFI Prospectus | MidCap S&P 400 Index Fund | Equity Securities Risk, Smaller Companies Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Smaller Companies Risk. Investments in smaller companies may involve greater risk and price volatility than investments in larger, more mature companies. Smaller companies may have limited product lines, markets, or financial resources; lack the competitive strength of larger companies; have less experienced managers; or depend on a few key employees. Their securities often are less widely held and trade less frequently and in lesser quantities, and their market prices often fluctuate more, than securities of larger companies.
PFI Prospectus | MidCap S&P 400 Index Fund | Index Fund Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Index Fund Risk. Index funds use a passive investment approach and generally do not attempt to manage market volatility, use defensive strategies, or reduce the effect of any long-term periods of poor investment performance. Therefore, the Fund may hold securities that present risks that an investment advisor researching individual securities might seek to avoid. An index fund has operating and other expenses while an index does not. As a result, over time, index funds tend to underperform the index. The correlation between fund performance and index performance may also be affected by the type of passive investment approach used by a fund (sampling or replication), changes in securities markets, changes in the composition of the index, and the timing of purchases and sales of fund shares. Errors or delays in compiling or rebalancing the Index may impact the performance of the Fund and increase transaction costs.
PFI Prospectus | MidCap S&P 400 Index Fund | Industry Concentration Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Industry Concentration Risk. A fund that concentrates investments in a particular industry or group of industries has greater exposure than other funds to market, economic, and other factors affecting that industry or group of industries.
PFI Prospectus | MidCap S&P 400 Index Fund | Investment Company Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Investment Company Securities Risk. A fund that invests in another investment company (for example, another fund or an exchange-traded fund (or ETF)) is subject to the risks associated with direct ownership of the securities in which such investment company invests. Fund shareholders indirectly bear their proportionate share of the expenses of each such investment company.
PFI Prospectus | MidCap S&P 400 Index Fund | Redemption And Large Transaction Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Redemption and Large Transaction Risk. Ownership of the Fund’s shares may be concentrated in one or a few large investors (such as funds of funds, institutional investors, and asset allocation programs) that may redeem or purchase shares in large quantities. These transactions may cause the Fund to sell securities to meet redemptions or to invest additional cash at times it would not otherwise do so, which may result in increased transaction costs, increased expenses, changes to expense ratios, and adverse effects to Fund performance. Such transactions may also accelerate the realization of taxable income if sales of portfolio securities result in gains. Moreover, reallocations by large shareholders among share classes of a fund may result in changes to the expense ratios of affected classes, which may increase the expenses paid by shareholders of the class that experienced the redemption.
PFI Prospectus | MidCap S&P 400 Index Fund | S&P 1500 TR (reflects no deduction for fees, expenses, or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
Label rr_AverageAnnualReturnLabel S&P 1500 TR (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 25.47%
5 Years rr_AverageAnnualReturnYear05 15.39%
10 Years rr_AverageAnnualReturnYear10 11.76%
PFI Prospectus | MidCap S&P 400 Index Fund | S&P Midcap 400 Index (reflects no deduction for fees, expenses, or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
Label rr_AverageAnnualReturnLabel S&P MidCap 400 Index (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 15.84%
5 Years rr_AverageAnnualReturnYear05 12.08%
10 Years rr_AverageAnnualReturnYear10 8.76%
PFI Prospectus | MidCap S&P 400 Index Fund | Class J  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PMFJX
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.15%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.15%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.12%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.42%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 143
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 135
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 235
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 530
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 43
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 135
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 235
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 530
Label rr_AverageAnnualReturnLabel Class J Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 15.06%
5 Years rr_AverageAnnualReturnYear05 12.20%
10 Years rr_AverageAnnualReturnYear10 8.79%
PFI Prospectus | MidCap S&P 400 Index Fund | Institutional Class  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol MPSIX
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.15%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.10%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.25%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 26
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 80
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 141
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 318
Annual Return 2014 rr_AnnualReturn2014 9.51%
Annual Return 2015 rr_AnnualReturn2015 (2.37%)
Annual Return 2016 rr_AnnualReturn2016 20.42%
Annual Return 2017 rr_AnnualReturn2017 15.96%
Annual Return 2018 rr_AnnualReturn2018 (11.32%)
Annual Return 2019 rr_AnnualReturn2019 26.02%
Annual Return 2020 rr_AnnualReturn2020 13.43%
Annual Return 2021 rr_AnnualReturn2021 24.38%
Annual Return 2022 rr_AnnualReturn2022 (13.22%)
Annual Return 2023 rr_AnnualReturn2023 16.16%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Highest return for a quarter during the period of the bar chart above:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Dec. 31, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 24.32%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Lowest return for a quarter during the period of the bar chart above:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (29.79%)
Label rr_AverageAnnualReturnLabel Institutional Class Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 16.16%
5 Years rr_AverageAnnualReturnYear05 12.38%
10 Years rr_AverageAnnualReturnYear10 9.02%
PFI Prospectus | MidCap S&P 400 Index Fund | Institutional Class | After Taxes on Distributions  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Institutional Class Return After Taxes on Distributions
1 Year rr_AverageAnnualReturnYear01 15.12%
5 Years rr_AverageAnnualReturnYear05 10.60%
10 Years rr_AverageAnnualReturnYear10 7.19%
PFI Prospectus | MidCap S&P 400 Index Fund | Institutional Class | After Taxes on Distributions and Sales  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Institutional Class Return After Taxes on Distributions and Sale of Fund Shares
1 Year rr_AverageAnnualReturnYear01 10.23%
5 Years rr_AverageAnnualReturnYear05 9.61%
10 Years rr_AverageAnnualReturnYear10 6.88%
PFI Prospectus | MidCap S&P 400 Index Fund | Class R-1  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PMSSX
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.15%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.35%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.54%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.04%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 106
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 331
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 574
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,271
Label rr_AverageAnnualReturnLabel Class R-1 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 15.32%
5 Years rr_AverageAnnualReturnYear05 11.49%
10 Years rr_AverageAnnualReturnYear10 8.15%
PFI Prospectus | MidCap S&P 400 Index Fund | Class R-3  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PMFMX
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.15%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.33%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.73%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 75
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 233
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 406
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 906
Label rr_AverageAnnualReturnLabel Class R-3 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 15.64%
5 Years rr_AverageAnnualReturnYear05 11.83%
10 Years rr_AverageAnnualReturnYear10 8.48%
PFI Prospectus | MidCap S&P 400 Index Fund | Class R-4  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PMFSX
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.15%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.10%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.29%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.54%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 55
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 173
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 302
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 677
Label rr_AverageAnnualReturnLabel Class R-4 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 15.87%
5 Years rr_AverageAnnualReturnYear05 12.04%
10 Years rr_AverageAnnualReturnYear10 8.68%
PFI Prospectus | MidCap S&P 400 Index Fund | Class R-5  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PMFPX
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.15%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.27%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.42%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 43
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 135
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 235
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 530
Label rr_AverageAnnualReturnLabel Class R-5 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 16.01%
5 Years rr_AverageAnnualReturnYear05 12.18%
10 Years rr_AverageAnnualReturnYear10 8.81%
PFI Prospectus | MidCap S&P 400 Index Fund | Class R-6  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PMAPX
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.15%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.01%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.16%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 16
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 52
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 90
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 205
Label rr_AverageAnnualReturnLabel Class R-6 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 16.33%
5 Years rr_AverageAnnualReturnYear05 12.47%
10 Years rr_AverageAnnualReturnYear10 8.91%
PFI Prospectus | MidCap Value Fund I  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading MIDCAP VALUE FUND I
Objective [Heading] rr_ObjectiveHeading Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The Fund seeks long-term growth of capital.
Expense [Heading] rr_ExpenseHeading Fees and Expenses of the Fund
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock
This table describes the fees and expenses that you may pay if you buy, hold, and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in Class A Shares of Principal Funds, Inc. More information about these and other discounts is available from your financial intermediary and in “Choosing a Share Class and The Costs of Investing” beginning on page 426 of the Fund’s Prospectus, Appendix B to the Prospectus titled “Intermediary-Specific Sales Charge Waivers and Reductions,” and “Multiple Class Structure” beginning on page 70 of the Fund’s Statement of Additional Information.
If you purchase Institutional Class or Class R-6 shares through certain programs offered by certain financial intermediaries, you may be required to pay a commission and/or other forms of compensation to the broker, or to your Financial Professional or other financial intermediary.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder Fees (fees paid directly from your investment)
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination February 28, 2025
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock
The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in Annual Fund Operating Expenses or in the Example, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 49.9% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 49.90%
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. The calculation of costs takes into account any applicable contractual fee waivers and/or expense reimbursements for the period noted in the table above. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, No Redemption, By Year, Caption [Text] rr_ExpenseExampleNoRedemptionByYearCaption With respect to Class J shares, you would pay the following expenses if you did not redeem your shares (all other classes would be the same as in the above example):
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
Under normal circumstances, the Fund invests at least 80% of its net assets, plus any borrowings for investment purposes, in equity securities of companies with medium market capitalizations at the time of purchase. For this Fund, companies with medium market capitalizations are those with market capitalizations within the range of companies comprising the Russell MidCap® Value Index (as of January 31, 2024, this range was between approximately $353.3 million and $76.6 billion). The Fund invests in value equity securities, an investment strategy that emphasizes buying equity securities that appear to be undervalued.
The Fund is primarily actively managed by the sub-advisors. In addition, Principal Global Investors, LLC may invest up to 30% of the Fund’s assets using an index sampling strategy designed to match the performance of the Russell MidCap® Value Index.
Strategy Portfolio Concentration [Text] rr_StrategyPortfolioConcentration Under normal circumstances, the Fund invests at least 80% of its net assets, plus any borrowings for investment purposes, in equity securities of companies with medium market capitalizations at the time of purchase.
Risk [Heading] rr_RiskHeading Principal Risks
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
The following information provides some indication of the risks of investing in the Fund. Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. You may get updated performance information at www.PrincipalAM.com.
The bar chart shows the investment returns of the Fund’s Institutional Class shares for each full calendar year of operations for 10 years (or, if shorter, the life of the Fund). The table shows for the last one, five, and ten calendar year periods (or, if shorter, the life of the Fund), how the Fund’s average annual total returns compare with those of one or more broad measures of market performance.
For periods prior to the inception date of Classes A and R-6 shares (April 2, 2019), the performance shown in the table for these newer classes is that of the Fund’s Institutional Class shares, adjusted to reflect the fees and expenses of the newer class. These adjustments result in performance for such periods that is no higher than the historical performance of the Institutional Class shares.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following information provides some indication of the risks of investing in the Fund.
Performance Additional Market Index [Text] rr_PerformanceAdditionalMarketIndex The Russell MidCap Value Index is included as an additional index for the Fund as it shows how the Fund’s performance compares with the returns of an index of funds with similar investment objectives.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.PrincipalAM.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.
Bar Chart [Heading] rr_BarChartHeading Total Returns as of December 31
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
Highest return for a quarter during the period of the bar chart above:Q2 202020.14 %
Lowest return for a quarter during the period of the bar chart above:Q1 2020(29.46)%
Performance Table Heading rr_PerformanceTableHeading Average Annual Total ReturnsFor the periods ended December 31, 2023
Performance Table Market Index Changed rr_PerformanceTableMarketIndexChanged Effective March 1, 2024, the Fund changed its primary broad-based index to the Russell 3000 Index in order to meet the revised definition of “broad-based securities market index.”
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are shown for Institutional Class shares only and would be different for the other share classes.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock
After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. After-tax returns are shown for Institutional Class shares only and would be different for the other share classes.
Effective March 1, 2024, the Fund changed its primary broad-based index to the Russell 3000 Index in order to meet the revised definition of “broad-based securities market index.” The Russell MidCap Value Index is included as an additional index for the Fund as it shows how the Fund’s performance compares with the returns of an index of funds with similar investment objectives.
PFI Prospectus | MidCap Value Fund I | Risk Lose Money [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Many factors affect that value, and it is possible to lose money by investing in the Fund.
PFI Prospectus | MidCap Value Fund I | Risk Not Insured Depository Institution [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
PFI Prospectus | MidCap Value Fund I | Equity Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Equity Securities Risk. A variety of factors can negatively impact the value of equity securities held by a fund, including a decline in the issuer’s financial condition, unfavorable performance of the issuer’s sector or industry, or changes in response to overall market and economic conditions. A fund’s principal market segment(s) (such as market capitalization or style) may underperform other market segments or the equity markets as a whole.
•Smaller Companies Risk. Investments in smaller companies may involve greater risk and price volatility than investments in larger, more mature companies. Smaller companies may have limited product lines, markets, or financial resources; lack the competitive strength of larger companies; have less experienced managers; or depend on a few key employees. Their securities often are less widely held and trade less frequently and in lesser quantities, and their market prices often fluctuate more, than securities of larger companies.
•Value Style Risk. Value investing entails the risk that value stocks may continue to be undervalued by the market for extended periods, including the entire period during which the stock is held by a fund, or the events that would cause the stock price to increase may not occur as anticipated or at all. Moreover, a stock that appears to be undervalued actually may be appropriately priced at a low level and, therefore, would not be profitable for the fund.
PFI Prospectus | MidCap Value Fund I | Equity Securities Risk, Smaller Companies Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Smaller Companies Risk. Investments in smaller companies may involve greater risk and price volatility than investments in larger, more mature companies. Smaller companies may have limited product lines, markets, or financial resources; lack the competitive strength of larger companies; have less experienced managers; or depend on a few key employees. Their securities often are less widely held and trade less frequently and in lesser quantities, and their market prices often fluctuate more, than securities of larger companies.
PFI Prospectus | MidCap Value Fund I | Equity Securities Risk, Value Style Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Value Style Risk. Value investing entails the risk that value stocks may continue to be undervalued by the market for extended periods, including the entire period during which the stock is held by a fund, or the events that would cause the stock price to increase may not occur as anticipated or at all. Moreover, a stock that appears to be undervalued actually may be appropriately priced at a low level and, therefore, would not be profitable for the fund.
PFI Prospectus | MidCap Value Fund I | Real Estate Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Real Estate Securities Risk. Investing in real estate securities subjects the fund to the risks associated with the real estate market (which are similar to the risks associated with direct ownership in real estate), including declines in real estate values, loss due to casualty or condemnation, property taxes, interest rate changes, increased expenses, cash flow of underlying real estate assets, regulatory changes (including zoning, land use, and rents), and environmental problems, as well as to the risks related to the management skill and creditworthiness of the issuer.
PFI Prospectus | MidCap Value Fund I | Redemption And Large Transaction Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Redemption and Large Transaction Risk. Ownership of the Fund’s shares may be concentrated in one or a few large investors (such as funds of funds, institutional investors, and asset allocation programs) that may redeem or purchase shares in large quantities. These transactions may cause the Fund to sell securities to meet redemptions or to invest additional cash at times it would not otherwise do so, which may result in increased transaction costs, increased expenses, changes to expense ratios, and adverse effects to Fund performance. Such transactions may also accelerate the realization of taxable income if sales of portfolio securities result in gains. Moreover, reallocations by large shareholders among share classes of a fund may result in changes to the expense ratios of affected classes, which may increase the expenses paid by shareholders of the class that experienced the redemption.
PFI Prospectus | MidCap Value Fund I | Russell 3000 Index (reflects no deduction for fees, expenses, or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
Label rr_AverageAnnualReturnLabel Russell 3000 Index (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 25.96%
5 Years rr_AverageAnnualReturnYear05 15.16%
10 Years rr_AverageAnnualReturnYear10 11.48%
PFI Prospectus | MidCap Value Fund I | Russell Midcap Value Index (reflects no deduction for fees, expenses, or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
Label rr_AverageAnnualReturnLabel Russell MidCap Value Index (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 12.71%
5 Years rr_AverageAnnualReturnYear05 11.16%
10 Years rr_AverageAnnualReturnYear10 8.26%
PFI Prospectus | MidCap Value Fund I | Class A  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PCMVX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 5.50%
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.64%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.25%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.14%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.02%) [28],[29]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.12%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 658
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 890
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,141
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,858
Label rr_AverageAnnualReturnLabel Class A Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 4.51%
5 Years rr_AverageAnnualReturnYear05 11.33%
10 Years rr_AverageAnnualReturnYear10 7.66%
PFI Prospectus | MidCap Value Fund I | Class J  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PVEJX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.64%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.15%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.15%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.94%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.02%) [28],[29]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.92%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 194
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 298
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 518
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,153
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 94
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 298
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 518
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,153
Label rr_AverageAnnualReturnLabel Class J Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 9.89%
5 Years rr_AverageAnnualReturnYear05 12.85%
10 Years rr_AverageAnnualReturnYear10 8.37%
PFI Prospectus | MidCap Value Fund I | Institutional Class  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PVMIX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.64%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.11%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.75%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.06%) [28],[29]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.69%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 70
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 234
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 411
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 925
Annual Return 2014 rr_AnnualReturn2014 13.50%
Annual Return 2015 rr_AnnualReturn2015 (7.16%)
Annual Return 2016 rr_AnnualReturn2016 15.26%
Annual Return 2017 rr_AnnualReturn2017 14.62%
Annual Return 2018 rr_AnnualReturn2018 (10.91%)
Annual Return 2019 rr_AnnualReturn2019 26.67%
Annual Return 2020 rr_AnnualReturn2020 6.51%
Annual Return 2021 rr_AnnualReturn2021 31.18%
Annual Return 2022 rr_AnnualReturn2022 (6.00%)
Annual Return 2023 rr_AnnualReturn2023 11.07%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Highest return for a quarter during the period of the bar chart above:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 20.14%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Lowest return for a quarter during the period of the bar chart above:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (29.46%)
Label rr_AverageAnnualReturnLabel Institutional Class Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 11.07%
5 Years rr_AverageAnnualReturnYear05 13.07%
10 Years rr_AverageAnnualReturnYear10 8.65%
PFI Prospectus | MidCap Value Fund I | Institutional Class | After Taxes on Distributions  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Institutional Class Return After Taxes on Distributions
1 Year rr_AverageAnnualReturnYear01 9.88%
5 Years rr_AverageAnnualReturnYear05 11.39%
10 Years rr_AverageAnnualReturnYear10 6.54%
PFI Prospectus | MidCap Value Fund I | Institutional Class | After Taxes on Distributions and Sales  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Institutional Class Return After Taxes on Distributions and Sale of Fund Shares
1 Year rr_AverageAnnualReturnYear01 7.39%
5 Years rr_AverageAnnualReturnYear05 10.17%
10 Years rr_AverageAnnualReturnYear10 6.30%
PFI Prospectus | MidCap Value Fund I | Class R-1  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PLASX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.64%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.35%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.53%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.52%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.02%) [28],[29]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.50%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 153
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 478
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 827
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,811
Label rr_AverageAnnualReturnLabel Class R-1 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 10.18%
5 Years rr_AverageAnnualReturnYear05 12.19%
10 Years rr_AverageAnnualReturnYear10 7.77%
PFI Prospectus | MidCap Value Fund I | Class R-3  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PMPRX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.64%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.32%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.21%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.02%) [28],[29]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.19%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 121
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 382
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 663
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,464
Label rr_AverageAnnualReturnLabel Class R-3 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 10.53%
5 Years rr_AverageAnnualReturnYear05 12.55%
10 Years rr_AverageAnnualReturnYear10 8.10%
PFI Prospectus | MidCap Value Fund I | Class R-4  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PABWX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.64%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.10%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.28%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.02%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.02%) [28],[29]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.00%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 102
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 323
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 561
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,246
Label rr_AverageAnnualReturnLabel Class R-4 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 10.74%
5 Years rr_AverageAnnualReturnYear05 12.76%
10 Years rr_AverageAnnualReturnYear10 8.31%
PFI Prospectus | MidCap Value Fund I | Class R-5  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PABVX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.64%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.26%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.90%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.02%) [28],[29]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.88%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 90
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 285
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 497
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,106
Label rr_AverageAnnualReturnLabel Class R-5 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 10.88%
5 Years rr_AverageAnnualReturnYear05 12.89%
10 Years rr_AverageAnnualReturnYear10 8.44%
PFI Prospectus | MidCap Value Fund I | Class R-6  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PCMSX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.64%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets none
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.64%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.02%) [28],[29]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.62%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 63
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 203
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 355
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 796
Label rr_AverageAnnualReturnLabel Class R-6 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 11.19%
5 Years rr_AverageAnnualReturnYear05 13.19%
10 Years rr_AverageAnnualReturnYear10 8.71%
PFI Prospectus | Money Market Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading MONEY MARKET FUND
Objective [Heading] rr_ObjectiveHeading Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The Fund seeks as high a level of current income as is considered consistent with preservation of principal and maintenance of liquidity.
Expense [Heading] rr_ExpenseHeading Fees and Expenses of the Fund
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock This table describes the fees and expenses that you may pay if you buy, hold, and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder Fees (fees paid directly from your investment)
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination February 28, 2025
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. The calculation of costs takes into account any applicable contractual fee waivers and/or expense reimbursements for the period noted in the table above. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, No Redemption, By Year, Caption [Text] rr_ExpenseExampleNoRedemptionByYearCaption With respect to Classes A and J shares, you would pay the following expenses if you did not redeem your shares:
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
The Fund seeks to maintain a stable net asset value of $1.00 per share by investing its assets in a portfolio of high quality, short-term money market instruments such as those issued by banks, corporations (U.S. and non-U.S.), municipalities, and the U.S. government. Such instruments include certificates of deposit, banker’s acceptances, commercial paper, treasury bills, bonds, repurchase agreements, and shares of other money market funds. The Fund maintains a dollar-weighted average portfolio maturity of 60 days or less. As with all mutual funds, the value of the Fund’s assets may rise or fall.
Risk [Heading] rr_RiskHeading Principal Risks
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
The following information provides some indication of the risks of investing in the Fund. Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. You may get updated performance information at www.PrincipalAM.com.
The bar chart shows the investment returns of the Fund’s Class A shares for each full calendar year of operations for 10 years (or, if shorter, the life of the Fund). These annual returns do not reflect sales charges on Class A shares; if they did, results would be lower. The table shows for the last one, five, and ten calendar year periods (or, if shorter, the life of the Fund), how the Fund’s average annual total returns compare with those of one or more broad measures of market performance.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following information provides some indication of the risks of investing in the Fund.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.PrincipalAM.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.
Bar Chart [Heading] rr_BarChartHeading Total Returns as of December 31
Bar Chart Does Not Reflect Sales Loads [Text] rr_BarChartDoesNotReflectSalesLoads These annual returns do not reflect sales charges on Class A shares; if they did, results would be lower.
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
Highest return for a quarter during the period of the bar chart above:Q4 20231.28 %
Lowest return for a quarter during the period of the bar chart above:Q2 20220.00 %
Performance Table Heading rr_PerformanceTableHeading Average Annual Total ReturnsFor the periods ended December 31, 2023
PFI Prospectus | Money Market Fund | Risk Lose Money [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock You could lose money by investing in the Fund.
PFI Prospectus | Money Market Fund | Risk Not Insured Depository Institution [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock An investment in the Fund is not a bank account and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
PFI Prospectus | Money Market Fund | Commercial Paper Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Commercial Paper Risk. The value of the Fund’s investment in commercial paper, which is generally unsecured, is susceptible to changes in interest rates and the issuer’s financial condition or credit quality. Commercial paper is usually repaid at maturity by the issuer from the proceeds of the issuance of new commercial paper. As a result, investments in commercial paper are subject to the risk that the issuer cannot issue enough new commercial paper to satisfy its outstanding obligations. In addition, under certain circumstances commercial paper may become illiquid or may suffer from reduced liquidity.
PFI Prospectus | Money Market Fund | Fixed-Income Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Fixed-Income Securities Risk. Fixed-income securities are subject to interest rate, credit quality, and liquidity risks. The market value of fixed-income securities generally declines when interest rates rise, and increased interest rates may adversely affect the liquidity of certain fixed-income securities. Moreover, an issuer of fixed-income securities could default on its payment obligations due to increased interest rates or for other reasons.
PFI Prospectus | Money Market Fund | Foreign Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Foreign Securities Risk. The risks of foreign securities include loss of value as a result of: political or economic instability; nationalization, expropriation, or confiscatory taxation; settlement delays; and limited government regulation (including less stringent reporting, accounting, and disclosure standards than are required of U.S. companies).
PFI Prospectus | Money Market Fund | Redemption And Large Transaction Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Redemption and Large Transaction Risk. Ownership of the Fund’s shares may be concentrated in one or a few large investors (such as funds of funds, institutional investors, and asset allocation programs) that may redeem or purchase shares in large quantities. These transactions may cause the Fund to sell securities to meet redemptions or to invest additional cash at times it would not otherwise do so, which may result in increased transaction costs, increased expenses, changes to expense ratios, and adverse effects to Fund performance. Such transactions may also accelerate the realization of taxable income if sales of portfolio securities result in gains. Moreover, reallocations by large shareholders among share classes of a fund may result in changes to the expense ratios of affected classes, which may increase the expenses paid by shareholders of the class that experienced the redemption.
PFI Prospectus | Money Market Fund | Repurchase Agreement Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Repurchase Agreement Risk. If the other party to a repurchase agreement defaults on its obligation under the agreement, the Fund may suffer delays and incur costs or lose money in exercising its rights under the agreement. If the seller fails to repurchase the security and the market value of the security declines, the Fund may lose money.
PFI Prospectus | Money Market Fund | U.S. Government Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock U.S. Government Securities Risk. Yields available from U.S. government securities are generally lower than yields from many other fixed-income securities. The value of U.S. government securities may be adversely impacted by changes in interest rates, changes in the credit rating of the U.S. government, or a default by the U.S. government.
PFI Prospectus | Money Market Fund | U.S. Government-Sponsored Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock U.S. Government-Sponsored Securities Risk. Securities issued by U.S. government-sponsored enterprises such as the Federal Home Loan Mortgage Corporation, the Federal National Mortgage Association, and the Federal Home Loan Banks are not issued or guaranteed by the U.S. government.
PFI Prospectus | Money Market Fund | Bloomberg U.S. Aggregate Bond Index (reflects no deduction for fees, expenses, or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
Label rr_AverageAnnualReturnLabel Bloomberg U.S. Aggregate Bond Index (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 5.53%
5 Years rr_AverageAnnualReturnYear05 1.10%
10 Years rr_AverageAnnualReturnYear10 1.81%
PFI Prospectus | Money Market Fund | Bloomberg U.S. Treasury Bellwethers 3 Month Index (reflects no deduction for fees, expenses, or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Performance Additional Market Index [Text] rr_PerformanceAdditionalMarketIndex The Bloomberg U.S. Treasury Bellwethers 3 Month Index is included as an additional index for the Fund as it shows how the Fund’s performance compares with the returns of an index of funds with similar investment objectives.
Performance Table Market Index Changed rr_PerformanceTableMarketIndexChanged Effective March 1, 2024, the Fund changed its primary broad-based index to the Bloomberg U.S. Aggregate Bond Index in order to meet the revised definition of “broad-based securities market index.” The Bloomberg U.S. Treasury Bellwethers 3 Month Index is included as an additional index for the Fund as it shows how the Fund’s performance compares with the returns of an index of funds with similar investment objectives.
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock
Effective March 1, 2024, the Fund changed its primary broad-based index to the Bloomberg U.S. Aggregate Bond Index in order to meet the revised definition of “broad-based securities market index.” The Bloomberg U.S. Treasury Bellwethers 3 Month Index is included as an additional index for the Fund as it shows how the Fund’s performance compares with the returns of an index of funds with similar investment objectives.
Label rr_AverageAnnualReturnLabel Bloomberg U.S. Treasury Bellwethers 3 Month Index (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 5.15%
5 Years rr_AverageAnnualReturnYear05 1.92%
10 Years rr_AverageAnnualReturnYear10 1.28%
PFI Prospectus | Money Market Fund | Class A  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PCSXX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.40%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.09%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.50%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets none [30],[31]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.50%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 151
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 160
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 280
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 628
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 51
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 160
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 280
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 628
Annual Return 2014 rr_AnnualReturn2014 none
Annual Return 2015 rr_AnnualReturn2015 none
Annual Return 2016 rr_AnnualReturn2016 0.04%
Annual Return 2017 rr_AnnualReturn2017 0.62%
Annual Return 2018 rr_AnnualReturn2018 1.57%
Annual Return 2019 rr_AnnualReturn2019 1.88%
Annual Return 2020 rr_AnnualReturn2020 0.38%
Annual Return 2021 rr_AnnualReturn2021 none
Annual Return 2022 rr_AnnualReturn2022 1.24%
Annual Return 2023 rr_AnnualReturn2023 4.79%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Highest return for a quarter during the period of the bar chart above:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Dec. 31, 2023
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 1.28%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Lowest return for a quarter during the period of the bar chart above:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Jun. 30, 2022
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn none
Label rr_AverageAnnualReturnLabel Class A Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 4.79%
5 Years rr_AverageAnnualReturnYear05 1.64%
10 Years rr_AverageAnnualReturnYear10 1.04%
PFI Prospectus | Money Market Fund | Class J  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PMJXX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.40%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.15%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.05%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.61%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.15%) [30],[31]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.46%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 147
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 180
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 325
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 748
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 47
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 180
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 325
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 748
Label rr_AverageAnnualReturnLabel Class J Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 3.84%
5 Years rr_AverageAnnualReturnYear05 1.63%
10 Years rr_AverageAnnualReturnYear10 1.02%
PFI Prospectus | Overseas Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading OVERSEAS FUND
Objective [Heading] rr_ObjectiveHeading Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The Fund seeks long-term growth of capital.
Expense [Heading] rr_ExpenseHeading Fees and Expenses of the Fund
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock
This table describes the fees and expenses that you may pay if you buy, hold, and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below.
If you purchase Institutional Class shares through certain programs offered by certain financial intermediaries, you may be required to pay a commission and/or other forms of compensation to the broker, or to your Financial Professional or other financial intermediary.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder Fees (fees paid directly from your investment):
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination February 28, 2025
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock
The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in Annual Fund Operating Expenses or in the Example, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 59.3% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 59.30%
Expenses Restated to Reflect Current [Text] rr_ExpensesRestatedToReflectCurrent Fees have been restated to reflect current fees.
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. The calculation of costs takes into account any applicable contractual fee waivers and/or expense reimbursements for the period noted in the table above. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
Under normal circumstances, the Fund invests at least 80% of its net assets, plus any borrowings for investment purposes, in equity securities that are tied economically to countries outside the U.S. at the time of purchase. The Fund considers a security to be tied economically to countries outside the U.S. (a “foreign security”) if one or more of the following criteria is present: (i) the issuer or guarantor of the security has its principal place of business or principal office outside the U.S.; (ii) the principal trading market for the security is a trading market outside the U.S.; (iii) the issuer or guarantor of the security derives a majority of its revenue from outside the U.S.; or (iv) the currency of settlement of the security is the currency of a country outside of the U.S.
The Fund invests in emerging market securities. The Fund invests in value equity securities, an investment strategy that emphasizes buying equity securities that appear to be undervalued. The Fund invests in equity securities of small, medium, and large market capitalization companies.
The Fund is primarily actively managed by the sub-advisors. In addition, Principal Global Investors, LLC may invest up to 30% of the Fund’s assets using an index sampling strategy designed to match the performance of the MSCI EAFE Value Index.
Risk [Heading] rr_RiskHeading Principal Risks
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
The following information provides some indication of the risks of investing in the Fund. Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. You may get updated performance information at www.PrincipalAM.com.
The bar chart shows the investment returns of the Fund’s Institutional Class shares for each full calendar year of operations for 10 years (or, if shorter, the life of the Fund). The table shows for the last one, five, and ten calendar year periods (or, if shorter, the life of the Fund), how the Fund’s average annual total returns compare with those of one or more broad measures of market performance.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following information provides some indication of the risks of investing in the Fund.
Performance Additional Market Index [Text] rr_PerformanceAdditionalMarketIndex The MSCI EAFE Value Index is included as an additional index for the Fund as it shows how the Fund’s performance compares with the returns of an index of funds with similar investment objectives.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.PrincipalAM.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.
Bar Chart [Heading] rr_BarChartHeading Total Returns as of December 31
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
Highest return for a quarter during the period of the bar chart above:Q4 202023.03 %
Lowest return for a quarter during the period of the bar chart above:Q1 2020(31.40)%
Performance Table Heading rr_PerformanceTableHeading Average Annual Total ReturnsFor the periods ended December 31, 2023
Performance Table Market Index Changed rr_PerformanceTableMarketIndexChanged Effective March 1, 2024, the Fund changed its primary broad-based index to the MSCI EAFE Index in order to meet the revised definition of “broad-based securities market index.”
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are shown for Institutional Class shares only and would be different for the other share classes.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock
After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. After-tax returns are shown for Institutional Class shares only and would be different for the other share classes.
Effective March 1, 2024, the Fund changed its primary broad-based index to the MSCI EAFE Index in order to meet the revised definition of “broad-based securities market index.” The MSCI EAFE Value Index is included as an additional index for the Fund as it shows how the Fund’s performance compares with the returns of an index of funds with similar investment objectives.
PFI Prospectus | Overseas Fund | Risk Lose Money [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Many factors affect that value, and it is possible to lose money by investing in the Fund.
PFI Prospectus | Overseas Fund | Risk Not Insured Depository Institution [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
PFI Prospectus | Overseas Fund | Emerging Markets Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Emerging Markets Risk. Investments in emerging markets may have more risk than those in developed markets because the emerging markets are less developed and more illiquid. Emerging markets can also be subject to increased social, economic, regulatory, and political uncertainties and can be extremely volatile. The U.S. Securities and Exchange Commission, the U.S. Department of Justice, and other U.S. authorities may be limited in their ability to pursue bad actors in emerging markets, including with respect to fraud.
PFI Prospectus | Overseas Fund | Equity Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Equity Securities Risk. A variety of factors can negatively impact the value of equity securities held by a fund, including a decline in the issuer’s financial condition, unfavorable performance of the issuer’s sector or industry, or changes in response to overall market and economic conditions. A fund’s principal market segment(s) (such as market capitalization or style) may underperform other market segments or the equity markets as a whole.
•Smaller Companies Risk. Investments in smaller companies may involve greater risk and price volatility than investments in larger, more mature companies. Smaller companies may have limited product lines, markets, or financial resources; lack the competitive strength of larger companies; have less experienced managers; or depend on a few key employees. Their securities often are less widely held and trade less frequently and in lesser quantities, and their market prices often fluctuate more, than securities of larger companies.
•Value Style Risk. Value investing entails the risk that value stocks may continue to be undervalued by the market for extended periods, including the entire period during which the stock is held by a fund, or the events that would cause the stock price to increase may not occur as anticipated or at all. Moreover, a stock that appears to be undervalued actually may be appropriately priced at a low level and, therefore, would not be profitable for the fund.
PFI Prospectus | Overseas Fund | Equity Securities Risk, Smaller Companies Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Smaller Companies Risk. Investments in smaller companies may involve greater risk and price volatility than investments in larger, more mature companies. Smaller companies may have limited product lines, markets, or financial resources; lack the competitive strength of larger companies; have less experienced managers; or depend on a few key employees. Their securities often are less widely held and trade less frequently and in lesser quantities, and their market prices often fluctuate more, than securities of larger companies.
PFI Prospectus | Overseas Fund | Equity Securities Risk, Value Style Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Value Style Risk. Value investing entails the risk that value stocks may continue to be undervalued by the market for extended periods, including the entire period during which the stock is held by a fund, or the events that would cause the stock price to increase may not occur as anticipated or at all. Moreover, a stock that appears to be undervalued actually may be appropriately priced at a low level and, therefore, would not be profitable for the fund.
PFI Prospectus | Overseas Fund | Foreign Currency Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Foreign Currency Risk. Risks of investing in securities denominated in, or that trade in, foreign (non-U.S.) currencies include changes in foreign exchange rates and foreign exchange restrictions.
PFI Prospectus | Overseas Fund | Foreign Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Foreign Securities Risk. The risks of foreign securities include loss of value as a result of: political or economic instability; nationalization, expropriation, or confiscatory taxation; settlement delays; and limited government regulation (including less stringent reporting, accounting, and disclosure standards than are required of U.S. companies). The Schedule of Investments included in the Fund’s annual and semi-annual reports identify the countries in which the Fund had invested, as of the date of the reports; to the extent a Fund has significant investments in issuers or securities tied to a certain country or region, it will be particularly susceptible to economic, political, regulatory or other events or conditions affecting such country or region.
PFI Prospectus | Overseas Fund | Passive Strategy Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Passive Strategy Risk. A portion of the Fund seeks to match the performance of a specified index. However, the correlation between the performance of this portion of the Fund and index performance may be affected by many factors, such as Fund expenses, the timing of cash flows into and out of the Fund, changes in securities markets, and changes in the composition of the index.
PFI Prospectus | Overseas Fund | Redemption And Large Transaction Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Redemption and Large Transaction Risk. Ownership of the Fund’s shares may be concentrated in one or a few large investors (such as funds of funds, institutional investors, and asset allocation programs) that may redeem or purchase shares in large quantities. These transactions may cause the Fund to sell securities to meet redemptions or to invest additional cash at times it would not otherwise do so, which may result in increased transaction costs, increased expenses, changes to expense ratios, and adverse effects to Fund performance. Such transactions may also accelerate the realization of taxable income if sales of portfolio securities result in gains. Moreover, reallocations by large shareholders among share classes of a fund may result in changes to the expense ratios of affected classes, which may increase the expenses paid by shareholders of the class that experienced the redemption.
PFI Prospectus | Overseas Fund | MSCI EAFE Index NTR (reflects withholding taxes on foreign dividends, but no deduction for fees, expenses, or other taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects withholding taxes on foreign dividends, but no deduction for fees, expenses, or other taxes)
Label rr_AverageAnnualReturnLabel MSCI EAFE Index NTR (reflects withholding taxes on foreign dividends, but no deduction for fees, expenses, or other taxes)
1 Year rr_AverageAnnualReturnYear01 18.24%
5 Years rr_AverageAnnualReturnYear05 8.16%
10 Years rr_AverageAnnualReturnYear10 4.28%
PFI Prospectus | Overseas Fund | MSCI EAFE Value Index NTR (reflects withholding taxes on foreign dividends, but no deduction for fees, expenses, or other taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects withholding taxes on foreign dividends, but no deduction for fees, expenses, or other taxes)
Label rr_AverageAnnualReturnLabel MSCI EAFE Value Index NTR (reflects withholding taxes on foreign dividends, but no deduction for fees, expenses, or other taxes)
1 Year rr_AverageAnnualReturnYear01 18.95%
5 Years rr_AverageAnnualReturnYear05 7.08%
10 Years rr_AverageAnnualReturnYear10 3.16%
PFI Prospectus | Overseas Fund | Institutional Class  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PINZX
Shareholder Fee, Other rr_ShareholderFeeOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.87% [32]
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.08% [33]
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.95%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.02%) [34]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.93%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 95
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 301
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 524
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,165
Annual Return 2014 rr_AnnualReturn2014 (5.41%)
Annual Return 2015 rr_AnnualReturn2015 (4.79%)
Annual Return 2016 rr_AnnualReturn2016 1.61%
Annual Return 2017 rr_AnnualReturn2017 25.59%
Annual Return 2018 rr_AnnualReturn2018 (17.86%)
Annual Return 2019 rr_AnnualReturn2019 20.83%
Annual Return 2020 rr_AnnualReturn2020 4.08%
Annual Return 2021 rr_AnnualReturn2021 11.19%
Annual Return 2022 rr_AnnualReturn2022 (4.89%)
Annual Return 2023 rr_AnnualReturn2023 22.61%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Highest return for a quarter during the period of the bar chart above:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Dec. 31, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 23.03%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Lowest return for a quarter during the period of the bar chart above:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (31.40%)
Label rr_AverageAnnualReturnLabel Institutional Class Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 22.61%
5 Years rr_AverageAnnualReturnYear05 10.27%
10 Years rr_AverageAnnualReturnYear10 4.41%
PFI Prospectus | Overseas Fund | Institutional Class | After Taxes on Distributions  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Institutional Class Return After Taxes on Distributions
1 Year rr_AverageAnnualReturnYear01 20.52%
5 Years rr_AverageAnnualReturnYear05 8.77%
10 Years rr_AverageAnnualReturnYear10 3.14%
PFI Prospectus | Overseas Fund | Institutional Class | After Taxes on Distributions and Sales  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Institutional Class Return After Taxes on Distributions and Sale of Fund Shares
1 Year rr_AverageAnnualReturnYear01 14.31%
5 Years rr_AverageAnnualReturnYear05 7.86%
10 Years rr_AverageAnnualReturnYear10 3.25%
PFI Prospectus | Overseas Fund | Class R-3  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PINTX
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.87% [32]
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.38% [33]
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.50%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.02%) [34]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.48%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 151
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 472
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 817
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,789
Label rr_AverageAnnualReturnLabel Class R-3 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 21.95%
5 Years rr_AverageAnnualReturnYear05 9.67%
10 Years rr_AverageAnnualReturnYear10 3.83%
PFI Prospectus | Overseas Fund | Class R-4  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PINUX
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.87% [32]
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.10%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.34% [33]
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.31%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.02%) [34]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.29%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 131
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 413
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 716
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,577
Label rr_AverageAnnualReturnLabel Class R-4 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 22.14%
5 Years rr_AverageAnnualReturnYear05 9.88%
10 Years rr_AverageAnnualReturnYear10 4.03%
PFI Prospectus | Principal Capital Appreciation Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading PRINCIPAL CAPITAL APPRECIATION FUND
Objective [Heading] rr_ObjectiveHeading Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The Fund seeks to provide long-term growth of capital.
Expense [Heading] rr_ExpenseHeading Fees and Expenses of the Fund
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock
This table describes the fees and expenses that you may pay if you buy, hold, and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in Class A Shares of Principal Funds, Inc. More information about these and other discounts is available from your financial intermediary and in “Choosing a Share Class and The Costs of Investing” beginning on page 426 of the Fund’s Prospectus, Appendix B to the Prospectus titled “Intermediary-Specific Sales Charge Waivers and Reductions,” and “Multiple Class Structure” beginning on page 70 of the Fund’s Statement of Additional Information.
If you purchase Institutional Class shares through certain programs offered by certain financial intermediaries, you may be required to pay a commission and/or other forms of compensation to the broker, or to your Financial Professional or other financial intermediary.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder Fees (fees paid directly from your investment)
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock
The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in Annual Fund Operating Expenses or in the Example, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 48.2% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 48.20%
Expense Breakpoint Discounts [Text] rr_ExpenseBreakpointDiscounts You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in Class A Shares of Principal Funds, Inc.
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 50,000
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
The Fund invests primarily in equity securities of companies with any market capitalization, but it has a greater exposure to large market capitalization companies than small or medium market capitalization companies. Those managing the Fund’s investments seek to invest in securities of businesses that they believe are trading at a discount to their private market value (i.e., the value of the business if it was sold), have a competitive advantage, and/or that have barriers to entry in their respective industries.
Risk [Heading] rr_RiskHeading Principal Risks
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
The following information provides some indication of the risks of investing in the Fund. Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. You may get updated performance information at www.PrincipalAM.com.
The bar chart shows the investment returns of the Fund’s Class A shares for each full calendar year of operations for 10 years (or, if shorter, the life of the Fund). These annual returns do not reflect sales charges on Class A shares; if they did, results would be lower. The table shows for the last one, five, and ten calendar year periods (or, if shorter, the life of the Fund), how the Fund’s average annual total returns compare with those of one or more broad measures of market performance.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following information provides some indication of the risks of investing in the Fund.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.PrincipalAM.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.
Bar Chart [Heading] rr_BarChartHeading Total Returns as of December 31
Bar Chart Does Not Reflect Sales Loads [Text] rr_BarChartDoesNotReflectSalesLoads These annual returns do not reflect sales charges on Class A shares; if they did, results would be lower.
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
Highest return for a quarter during the period of the bar chart above:Q2 202019.69 %
Lowest return for a quarter during the period of the bar chart above:Q1 2020(19.46)%
Performance Table Heading rr_PerformanceTableHeading Average Annual Total ReturnsFor the periods ended December 31, 2023
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are shown for Class A shares only and would be different for the other share classes.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock
After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. After-tax returns are shown for Class A shares only and would be different for the other share classes.
PFI Prospectus | Principal Capital Appreciation Fund | Risk Lose Money [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Many factors affect that value, and it is possible to lose money by investing in the Fund.
PFI Prospectus | Principal Capital Appreciation Fund | Risk Not Insured Depository Institution [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
PFI Prospectus | Principal Capital Appreciation Fund | Equity Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Equity Securities Risk. A variety of factors can negatively impact the value of equity securities held by a fund, including a decline in the issuer’s financial condition, unfavorable performance of the issuer’s sector or industry, or changes in response to overall market and economic conditions. A fund’s principal market segment(s) (such as market capitalization or style) may underperform other market segments or the equity markets as a whole.
•Smaller Companies Risk. Investments in smaller companies may involve greater risk and price volatility than investments in larger, more mature companies. Smaller companies may have limited product lines, markets, or financial resources; lack the competitive strength of larger companies; have less experienced managers; or depend on a few key employees. Their securities often are less widely held and trade less frequently and in lesser quantities, and their market prices often fluctuate more, than securities of larger companies.
PFI Prospectus | Principal Capital Appreciation Fund | Equity Securities Risk, Smaller Companies Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Smaller Companies Risk. Investments in smaller companies may involve greater risk and price volatility than investments in larger, more mature companies. Smaller companies may have limited product lines, markets, or financial resources; lack the competitive strength of larger companies; have less experienced managers; or depend on a few key employees. Their securities often are less widely held and trade less frequently and in lesser quantities, and their market prices often fluctuate more, than securities of larger companies.
PFI Prospectus | Principal Capital Appreciation Fund | Redemption And Large Transaction Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Redemption and Large Transaction Risk. Ownership of the Fund’s shares may be concentrated in one or a few large investors (such as funds of funds, institutional investors, and asset allocation programs) that may redeem or purchase shares in large quantities. These transactions may cause the Fund to sell securities to meet redemptions or to invest additional cash at times it would not otherwise do so, which may result in increased transaction costs, increased expenses, changes to expense ratios, and adverse effects to Fund performance. Such transactions may also accelerate the realization of taxable income if sales of portfolio securities result in gains. Moreover, reallocations by large shareholders among share classes of a fund may result in changes to the expense ratios of affected classes, which may increase the expenses paid by shareholders of the class that experienced the redemption.
PFI Prospectus | Principal Capital Appreciation Fund | Russell 3000 Index (reflects no deduction for fees, expenses, or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
Label rr_AverageAnnualReturnLabel Russell 3000 Index (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 25.96%
5 Years rr_AverageAnnualReturnYear05 15.16%
10 Years rr_AverageAnnualReturnYear10 11.48%
PFI Prospectus | Principal Capital Appreciation Fund | Class A  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol CMNWX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 5.50%
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.43%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.10%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.78%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 625
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 785
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 959
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,463
Annual Return 2014 rr_AnnualReturn2014 12.30%
Annual Return 2015 rr_AnnualReturn2015 2.04%
Annual Return 2016 rr_AnnualReturn2016 8.83%
Annual Return 2017 rr_AnnualReturn2017 20.64%
Annual Return 2018 rr_AnnualReturn2018 (3.52%)
Annual Return 2019 rr_AnnualReturn2019 32.17%
Annual Return 2020 rr_AnnualReturn2020 18.38%
Annual Return 2021 rr_AnnualReturn2021 27.57%
Annual Return 2022 rr_AnnualReturn2022 (16.37%)
Annual Return 2023 rr_AnnualReturn2023 25.00%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Highest return for a quarter during the period of the bar chart above:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 19.69%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Lowest return for a quarter during the period of the bar chart above:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (19.46%)
Label rr_AverageAnnualReturnLabel Class A Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 18.13%
5 Years rr_AverageAnnualReturnYear05 14.55%
10 Years rr_AverageAnnualReturnYear10 11.09%
PFI Prospectus | Principal Capital Appreciation Fund | Class A | After Taxes on Distributions  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Class A Return After Taxes on Distributions
1 Year rr_AverageAnnualReturnYear01 17.93%
5 Years rr_AverageAnnualReturnYear05 13.22%
10 Years rr_AverageAnnualReturnYear10 8.86%
PFI Prospectus | Principal Capital Appreciation Fund | Class A | After Taxes on Distributions and Sales  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Class A Return After Taxes on Distributions and Sale of Fund Shares
1 Year rr_AverageAnnualReturnYear01 10.87%
5 Years rr_AverageAnnualReturnYear05 11.44%
10 Years rr_AverageAnnualReturnYear10 8.35%
PFI Prospectus | Principal Capital Appreciation Fund | Institutional Class  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PWCIX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.43%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.03%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.46%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 47
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 148
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 258
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 579
Label rr_AverageAnnualReturnLabel Institutional Class Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 25.42%
5 Years rr_AverageAnnualReturnYear05 16.24%
10 Years rr_AverageAnnualReturnYear10 12.11%
PFI Prospectus | Principal Capital Appreciation Fund | Class R-1  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PCAMX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.43%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.35%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.54%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.32%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 134
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 418
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 723
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,590
Label rr_AverageAnnualReturnLabel Class R-1 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 24.34%
5 Years rr_AverageAnnualReturnYear05 15.23%
10 Years rr_AverageAnnualReturnYear10 11.14%
PFI Prospectus | Principal Capital Appreciation Fund | Class R-3  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PCAOX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.43%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.33%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.01%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 103
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 322
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 558
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,236
Label rr_AverageAnnualReturnLabel Class R-3 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 24.73%
5 Years rr_AverageAnnualReturnYear05 15.59%
10 Years rr_AverageAnnualReturnYear10 11.49%
PFI Prospectus | Principal Capital Appreciation Fund | Class R-4  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PCAPX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.43%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.10%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.29%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.82%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 84
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 262
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 455
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,014
Label rr_AverageAnnualReturnLabel Class R-4 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 24.96%
5 Years rr_AverageAnnualReturnYear05 15.80%
10 Years rr_AverageAnnualReturnYear10 11.70%
PFI Prospectus | Principal Capital Appreciation Fund | Class R-5  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PCAQX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.43%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.27%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.70%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 72
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 224
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 390
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 871
Label rr_AverageAnnualReturnLabel Class R-5 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 25.12%
5 Years rr_AverageAnnualReturnYear05 15.95%
10 Years rr_AverageAnnualReturnYear10 11.83%
PFI Prospectus | Principal LifeTime Strategic Income Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading PRINCIPAL LIFETIME STRATEGIC INCOME FUND
Objective [Heading] rr_ObjectiveHeading Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock
The Fund seeks current income, and as a secondary objective, capital appreciation.
Objective, Secondary [Text Block] rr_ObjectiveSecondaryTextBlock as a secondary objective, capital appreciation.
Expense [Heading] rr_ExpenseHeading Fees and Expenses of the Fund
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock
This table describes the fees and expenses that you may pay if you buy, hold, and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $100,000 in Class A Shares of Principal Funds, Inc. More information about these and other discounts is available from your financial intermediary and in “Choosing a Share Class and The Costs of Investing” beginning on page 426 of the Fund’s Prospectus, Appendix B to the Prospectus titled “Intermediary-Specific Sales Charge Waivers and Reductions,” and “Multiple Class Structure” beginning on page 70 of the Fund’s Statement of Additional Information.
If you purchase Institutional Class shares through certain programs offered by certain financial intermediaries, you may be required to pay a commission and/or other forms of compensation to the broker, or to your Financial Professional or other financial intermediary.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder Fees (fees paid directly from your investment)
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination February 28, 2025
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock The Fund and each underlying fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs. These costs, which are not reflected in Annual Fund Operating Expenses or in the Example, affect the Fund’s and the underlying funds' performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 11.8% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 11.80%
Expense Breakpoint Discounts [Text] rr_ExpenseBreakpointDiscounts You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $100,000 in Class A Shares of Principal Funds, Inc.
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 100,000
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. The calculation of costs takes into account any applicable contractual fee waivers and/or expense reimbursements for the period noted in the table above. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, No Redemption, By Year, Caption [Text] rr_ExpenseExampleNoRedemptionByYearCaption With respect to Class J shares, you would pay the following expenses if you did not redeem your shares (all other classes would be the same as in the above example):
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
The Fund invests according to an asset allocation strategy designed for investors primarily seeking current income and secondarily capital appreciation. The Fund’s asset allocation is designed for investors who are approximately 10 years beyond the normal retirement age of 65. The Fund is a fund of funds and invests in underlying funds of Principal Funds, Inc. (“PFI”). Its underlying funds consist of domestic and foreign equity funds, fixed-income funds, real asset funds, and other funds that aim to offer diversification beyond traditional equity and fixed-income securities. The diversification of the Fund is designed to moderate overall price volatility. The Fund may add, remove, or substitute underlying funds at any time.
The Fund is managed with strategic or long-term asset class targets and target ranges. There is a rebalancing strategy that aligns with the target weights to identify asset classes that are either overweight or underweight. The Fund may shift asset class targets in response to normal evaluative processes, the shortening time horizon of the Fund, or changes in market forces or Fund circumstances.
In selecting underlying funds and target weights, the Fund considers both quantitative measures (e.g., past performance, expected levels of risk and returns, expense levels, diversification, and style consistency) and qualitative factors (e.g., organizational stability, investment experience, investment and risk management processes, and information, trading, and compliance systems). There are no minimum or maximum percentages of assets that the Fund must invest in a specific asset class or underlying fund.
The underlying funds invest in growth and value stocks of large market capitalization companies, fixed-income securities, domestic and foreign securities, securities denominated in foreign currencies, investment companies, securitized products, U.S. government and U.S. government-sponsored securities, and derivatives. A derivative is a financial arrangement, the value of which is derived from, or based on, a traditional security, asset, or market index. The underlying funds principally use futures, options, swaps (including, for example, credit default, interest rate, and currency swaps), and forwards in order to gain exposure to a variety of securities or asset classes or attempt to reduce risk.
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Risk [Heading] rr_RiskHeading Principal Risks
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
The following information provides some indication of the risks of investing in the Fund. Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. You may get updated performance information at www.PrincipalAM.com.
The bar chart shows the investment returns of the Fund’s Class A shares for each full calendar year of operations for 10 years (or, if shorter, the life of the Fund). These annual returns do not reflect sales charges on Class A shares; if they did, results would be lower. The table shows for the last one, five, and ten calendar year periods (or, if shorter, the life of the Fund), how the Fund’s average annual total returns compare with those of one or more broad measures of market performance.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following information provides some indication of the risks of investing in the Fund.
Performance Additional Market Index [Text] rr_PerformanceAdditionalMarketIndex The S&P Target Date Retirement Income Index is included as an additional index for the Fund as it shows how the Fund’s performance compares with the returns of an index of funds with similar investment objectives.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.PrincipalAM.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.
Bar Chart [Heading] rr_BarChartHeading Total Returns as of December 31
Bar Chart Does Not Reflect Sales Loads [Text] rr_BarChartDoesNotReflectSalesLoads These annual returns do not reflect sales charges on Class A shares; if they did, results would be lower.
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
Highest return for a quarter during the period of the bar chart above:Q2 20208.31 %
Lowest return for a quarter during the period of the bar chart above:Q2 2022(8.45)%
Performance Table Heading rr_PerformanceTableHeading Average Annual Total ReturnsFor the periods ended December 31, 2023
Performance Table Market Index Changed rr_PerformanceTableMarketIndexChanged Effective March 1, 2024, the Fund changed its primary broad-based index to the Bloomberg U.S. Aggregate Bond Index in order to meet the revised definition of “broad-based securities market index.”
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are shown for Class A shares only and would be different for the other share classes.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock
After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. After-tax returns are shown for Class A shares only and would be different for the other share classes.
Effective March 1, 2024, the Fund changed its primary broad-based index to the Bloomberg U.S. Aggregate Bond Index in order to meet the revised definition of “broad-based securities market index.” The S&P Target Date Retirement Income Index is included as an additional index for the Fund as it shows how the Fund’s performance compares with the returns of an index of funds with similar investment objectives.
PFI Prospectus | Principal LifeTime Strategic Income Fund | Risk Lose Money [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Many factors affect that value, and it is possible to lose money by investing in the Fund.
PFI Prospectus | Principal LifeTime Strategic Income Fund | Risk Not Insured Depository Institution [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
PFI Prospectus | Principal LifeTime Strategic Income Fund | Counterparty Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Counterparty Risk. Counterparty risk is the risk that the counterparty to a contract or other obligation will be unable or unwilling to honor its obligations.
PFI Prospectus | Principal LifeTime Strategic Income Fund | Derivatives Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Derivatives Risk. Derivatives may not move in the direction anticipated by the portfolio manager. Transactions in derivatives may increase volatility, cause the liquidation of portfolio positions when not advantageous to do so, and result in disproportionate losses that may be substantially greater than a fund’s initial investment.
•Credit Default Swaps. Credit default swaps involve special risks in addition to those associated with swaps generally because they are difficult to value, are highly susceptible to liquidity and credit risk, and generally pay a return to the party that has paid the premium only in the event of an actual default by the issuer of the underlying obligation (as opposed to a credit downgrade or other indication of financial difficulty). The protection “buyer” in a credit default contract may be obligated to pay the protection “seller” an up-front payment or a periodic stream of payments over the term of the contract, provided, generally, that no credit event on a reference obligation has occurred. If a credit event occurs, the seller generally must pay the buyer the “par value” (i.e., full notional value) of the swap in exchange for an equal face amount of deliverable obligations of the reference entity described in the swap, or the seller may be required to deliver the related net cash amount, if the swap is cash settled. The Fund may be either the buyer or seller in the transaction.
•Forward Contracts, Futures, and Swaps. Forward contracts, futures, and swaps involve specific risks, including: the imperfect correlation between the change in market value of the instruments held by the fund and the price of the forward contract, future, or swap; possible lack of a liquid secondary market for a forward contract, future, or swap and the resulting inability to close a forward contract, future, or swap when desired; counterparty risk; and if the fund has insufficient cash, it may have to sell securities from its portfolio to meet daily variation margin requirements.
•Options. Options involve specific risks, including: the imperfect correlation between the change in market value of the instruments held by the Fund and the price of the options; counterparty risk; difference in trading hours for the options markets and the markets for the underlying securities (rate movements can take place in the underlying markets that cannot be reflected in the options markets); and an insufficient liquid secondary market for particular options.
PFI Prospectus | Principal LifeTime Strategic Income Fund | Derivatives Risk, Credit Default Swaps Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Credit Default Swaps. Credit default swaps involve special risks in addition to those associated with swaps generally because they are difficult to value, are highly susceptible to liquidity and credit risk, and generally pay a return to the party that has paid the premium only in the event of an actual default by the issuer of the underlying obligation (as opposed to a credit downgrade or other indication of financial difficulty). The protection “buyer” in a credit default contract may be obligated to pay the protection “seller” an up-front payment or a periodic stream of payments over the term of the contract, provided, generally, that no credit event on a reference obligation has occurred. If a credit event occurs, the seller generally must pay the buyer the “par value” (i.e., full notional value) of the swap in exchange for an equal face amount of deliverable obligations of the reference entity described in the swap, or the seller may be required to deliver the related net cash amount, if the swap is cash settled. The Fund may be either the buyer or seller in the transaction.
PFI Prospectus | Principal LifeTime Strategic Income Fund | Derivatives Risk, Forward Contracts, Futures, And Swaps Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Forward Contracts, Futures, and Swaps. Forward contracts, futures, and swaps involve specific risks, including: the imperfect correlation between the change in market value of the instruments held by the fund and the price of the forward contract, future, or swap; possible lack of a liquid secondary market for a forward contract, future, or swap and the resulting inability to close a forward contract, future, or swap when desired; counterparty risk; and if the fund has insufficient cash, it may have to sell securities from its portfolio to meet daily variation margin requirements.
PFI Prospectus | Principal LifeTime Strategic Income Fund | Derivatives Risk, Options Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Options. Options involve specific risks, including: the imperfect correlation between the change in market value of the instruments held by the Fund and the price of the options; counterparty risk; difference in trading hours for the options markets and the markets for the underlying securities (rate movements can take place in the underlying markets that cannot be reflected in the options markets); and an insufficient liquid secondary market for particular options.
PFI Prospectus | Principal LifeTime Strategic Income Fund | Equity Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Equity Securities Risk. A variety of factors can negatively impact the value of equity securities held by a fund, including a decline in the issuer’s financial condition, unfavorable performance of the issuer’s sector or industry, or changes in response to overall market and economic conditions. A fund’s principal market segment(s) (such as market capitalization or style) may underperform other market segments or the equity markets as a whole.
•Growth Style Risk. Growth investing entails the risk that if growth companies do not increase their earnings at a rate expected by investors, the market price of their stock may decline significantly, even if earnings show an absolute increase. Growth company stocks also typically lack the dividend yield that can lessen price declines in market downturns.
•Value Style Risk. Value investing entails the risk that value stocks may continue to be undervalued by the market for extended periods, including the entire period during which the stock is held by a fund, or the events that would cause the stock price to increase may not occur as anticipated or at all. Moreover, a stock that appears to be undervalued actually may be appropriately priced at a low level and, therefore, would not be profitable for the fund.
PFI Prospectus | Principal LifeTime Strategic Income Fund | Equity Securities Risk, Growth Style Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Growth Style Risk. Growth investing entails the risk that if growth companies do not increase their earnings at a rate expected by investors, the market price of their stock may decline significantly, even if earnings show an absolute increase. Growth company stocks also typically lack the dividend yield that can lessen price declines in market downturns.
PFI Prospectus | Principal LifeTime Strategic Income Fund | Equity Securities Risk, Value Style Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Value Style Risk. Value investing entails the risk that value stocks may continue to be undervalued by the market for extended periods, including the entire period during which the stock is held by a fund, or the events that would cause the stock price to increase may not occur as anticipated or at all. Moreover, a stock that appears to be undervalued actually may be appropriately priced at a low level and, therefore, would not be profitable for the fund.
PFI Prospectus | Principal LifeTime Strategic Income Fund | Fixed-Income Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Fixed-Income Securities Risk. Fixed-income securities are subject to interest rate, credit quality, and liquidity risks. The market value of fixed-income securities generally declines when interest rates rise, and increased interest rates may adversely affect the liquidity of certain fixed-income securities. Moreover, an issuer of fixed-income securities could default on its payment obligations due to increased interest rates or for other reasons.
PFI Prospectus | Principal LifeTime Strategic Income Fund | Foreign Currency Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Foreign Currency Risk. Risks of investing in securities denominated in, or that trade in, foreign (non-U.S.) currencies include changes in foreign exchange rates and foreign exchange restrictions.
PFI Prospectus | Principal LifeTime Strategic Income Fund | Foreign Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Foreign Securities Risk. The risks of foreign securities include loss of value as a result of: political or economic instability; nationalization, expropriation, or confiscatory taxation; settlement delays; and limited government regulation (including less stringent reporting, accounting, and disclosure standards than are required of U.S. companies).
PFI Prospectus | Principal LifeTime Strategic Income Fund | Fund Of Funds Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Fund of Funds Risk. Fund shareholders bear indirectly their proportionate share of the expenses of other investment companies (for example, other mutual funds or exchange-traded funds) in which the Fund invests (“underlying funds”). The Fund’s selection and weighting of asset classes and allocation of investments in underlying funds may cause it to underperform other funds with a similar investment objective. The Fund’s performance and risks correspond directly to the performance and risks of the underlying funds in which it invests, proportionately in accordance with the weightings of such investments, and there is no assurance that the underlying funds will achieve their investment objectives. Management of the Fund entails potential conflicts of interest: the Fund invests in affiliated underlying funds; and PGI and its affiliates may earn different fees from different underlying funds and may have an incentive to allocate more Fund assets to underlying funds from which they receive higher fees.
PFI Prospectus | Principal LifeTime Strategic Income Fund | Portfolio Duration Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Portfolio Duration Risk. Portfolio duration is a measure of the expected life of a fixed-income security and its sensitivity to changes in interest rates. The longer a fund’s average portfolio duration, the more sensitive the fund will be to changes in interest rates, which means funds with longer average portfolio durations may be more volatile than those with shorter durations.
PFI Prospectus | Principal LifeTime Strategic Income Fund | Redemption And Large Transaction Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Redemption and Large Transaction Risk. Ownership of the Fund’s shares may be concentrated in one or a few large investors (such as funds of funds, institutional investors, and asset allocation programs) that may redeem or purchase shares in large quantities. These transactions may cause the Fund to sell securities to meet redemptions or to invest additional cash at times it would not otherwise do so, which may result in increased transaction costs, increased expenses, changes to expense ratios, and adverse effects to Fund performance. Such transactions may also accelerate the realization of taxable income if sales of portfolio securities result in gains. Moreover, reallocations by large shareholders among share classes of a fund may result in changes to the expense ratios of affected classes, which may increase the expenses paid by shareholders of the class that experienced the redemption.
PFI Prospectus | Principal LifeTime Strategic Income Fund | Securitized Products Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Securitized Products Risk. Investments in securitized products are subject to risks similar to traditional fixed-income securities, such as credit, interest rate, liquidity, prepayment, extension, and default risk, as well as additional risks associated with the nature of the assets and the servicing of those assets. Unscheduled prepayments on securitized products may have to be reinvested at lower rates. A reduction in prepayments may increase the effective maturities of these securities, exposing them to the risk of decline in market value over time (extension risk).
PFI Prospectus | Principal LifeTime Strategic Income Fund | Target Date Fund Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Target Date Fund Risk. A target date fund should not be selected based solely on age or retirement date because there is no guarantee that this Fund will provide adequate income at or through retirement.
PFI Prospectus | Principal LifeTime Strategic Income Fund | U.S. Government Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock U.S. Government Securities Risk. Yields available from U.S. government securities are generally lower than yields from many other fixed-income securities. The value of U.S. government securities may be adversely impacted by changes in interest rates, changes in the credit rating of the U.S. government, or a default by the U.S. government.
PFI Prospectus | Principal LifeTime Strategic Income Fund | U.S. Government-Sponsored Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock U.S. Government-Sponsored Securities Risk. Securities issued by U.S. government-sponsored enterprises such as the Federal Home Loan Mortgage Corporation, the Federal National Mortgage Association, and the Federal Home Loan Banks are not issued or guaranteed by the U.S. government.
PFI Prospectus | Principal LifeTime Strategic Income Fund | Bloomberg U.S. Aggregate Bond Index (reflects no deduction for fees, expenses, or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
Label rr_AverageAnnualReturnLabel Bloomberg U.S. Aggregate Bond Index (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 5.53%
5 Years rr_AverageAnnualReturnYear05 1.10%
10 Years rr_AverageAnnualReturnYear10 1.81%
PFI Prospectus | Principal LifeTime Strategic Income Fund | S&P Target Date Retirement Income Index (reflects no deduction for fees, expenses, or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
Label rr_AverageAnnualReturnLabel S&P Target Date Retirement Income Index (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 10.35%
5 Years rr_AverageAnnualReturnYear05 4.90%
10 Years rr_AverageAnnualReturnYear10 3.98%
PFI Prospectus | Principal LifeTime Strategic Income Fund | Class A  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PALTX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 3.75%
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.19%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.50%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.94%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.06%) [35]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.88%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 461
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 658
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 870
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,481
Annual Return 2014 rr_AnnualReturn2014 4.16%
Annual Return 2015 rr_AnnualReturn2015 (1.23%)
Annual Return 2016 rr_AnnualReturn2016 4.48%
Annual Return 2017 rr_AnnualReturn2017 8.27%
Annual Return 2018 rr_AnnualReturn2018 (3.46%)
Annual Return 2019 rr_AnnualReturn2019 12.42%
Annual Return 2020 rr_AnnualReturn2020 9.70%
Annual Return 2021 rr_AnnualReturn2021 4.13%
Annual Return 2022 rr_AnnualReturn2022 (13.44%)
Annual Return 2023 rr_AnnualReturn2023 10.49%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Highest return for a quarter during the period of the bar chart above:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 8.31%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Lowest return for a quarter during the period of the bar chart above:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Jun. 30, 2022
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (8.45%)
Label rr_AverageAnnualReturnLabel Class A Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 6.32%
5 Years rr_AverageAnnualReturnYear05 3.40%
10 Years rr_AverageAnnualReturnYear10 2.88%
PFI Prospectus | Principal LifeTime Strategic Income Fund | Class A | After Taxes on Distributions  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Class A Return After Taxes on Distributions
1 Year rr_AverageAnnualReturnYear01 5.44%
5 Years rr_AverageAnnualReturnYear05 1.97%
10 Years rr_AverageAnnualReturnYear10 1.61%
PFI Prospectus | Principal LifeTime Strategic Income Fund | Class A | After Taxes on Distributions and Sales  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Class A Return After Taxes on Distributions and Sale of Fund Shares
1 Year rr_AverageAnnualReturnYear01 3.82%
5 Years rr_AverageAnnualReturnYear05 2.26%
10 Years rr_AverageAnnualReturnYear10 1.86%
PFI Prospectus | Principal LifeTime Strategic Income Fund | Class J  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PLSJX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.15%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.06%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.50%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.71%
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.71%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 173
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 227
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 395
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 883
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 73
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 227
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 395
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 883
Label rr_AverageAnnualReturnLabel Class J Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 9.67%
5 Years rr_AverageAnnualReturnYear05 4.36%
10 Years rr_AverageAnnualReturnYear10 3.41%
PFI Prospectus | Principal LifeTime Strategic Income Fund | Institutional Class  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PLSIX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.02%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.50%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.52%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.02%)
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.50%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 51
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 165
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 289
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 651
Label rr_AverageAnnualReturnLabel Institutional Class Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 10.93%
5 Years rr_AverageAnnualReturnYear05 4.58%
10 Years rr_AverageAnnualReturnYear10 3.65%
PFI Prospectus | Principal LifeTime Strategic Income Fund | Class R-1  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PLAIX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.35%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.54%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.50%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.39%
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.39%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 142
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 440
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 761
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,669
Label rr_AverageAnnualReturnLabel Class R-1 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 9.94%
5 Years rr_AverageAnnualReturnYear05 3.66%
10 Years rr_AverageAnnualReturnYear10 2.74%
PFI Prospectus | Principal LifeTime Strategic Income Fund | Class R-3  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PLSMX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.33%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.50%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.08%
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.08%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 110
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 343
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 595
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,317
Label rr_AverageAnnualReturnLabel Class R-3 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 10.22%
5 Years rr_AverageAnnualReturnYear05 3.98%
10 Years rr_AverageAnnualReturnYear10 3.06%
PFI Prospectus | Principal LifeTime Strategic Income Fund | Class R-4  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PLSSX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.10%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.29%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.50%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.89%
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.89%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 91
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 284
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 493
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,096
Label rr_AverageAnnualReturnLabel Class R-4 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 10.47%
5 Years rr_AverageAnnualReturnYear05 4.20%
10 Years rr_AverageAnnualReturnYear10 3.26%
PFI Prospectus | Principal LifeTime Strategic Income Fund | Class R-5  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PLSPX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.27%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.50%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.77%
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.77%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 79
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 246
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 428
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 954
Label rr_AverageAnnualReturnLabel Class R-5 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 10.70%
5 Years rr_AverageAnnualReturnYear05 4.32%
10 Years rr_AverageAnnualReturnYear10 3.39%
PFI Prospectus | Principal LifeTime 2015 Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading PRINCIPAL LIFETIME 2015 FUND
Objective [Heading] rr_ObjectiveHeading Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The Fund seeks a total return consisting of long-term growth of capital and current income.
Expense [Heading] rr_ExpenseHeading Fees and Expenses of the Fund
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock
This table describes the fees and expenses that you may pay if you buy, hold, and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below.
If you purchase Institutional Class shares through certain programs offered by certain financial intermediaries, you may be required to pay a commission and/or other forms of compensation to the broker, or to your Financial Professional or other financial intermediary.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder Fees (fees paid directly from your investment):
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock
The Fund and each underlying fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs. These costs, which are not reflected in Annual Fund Operating Expenses or in the Example, affect the Fund’s and the underlying fund's performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 14.5% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 14.50%
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
The Fund operates as a “target date fund” that invests according to an asset allocation strategy designed for investors having a retirement investment goal close to the year in the Fund’s name. The Fund is a fund of funds and invests in underlying funds of Principal Funds, Inc. (“PFI”). Its underlying funds consist of domestic and foreign equity funds, fixed-income funds, real asset funds, and other funds that aim to offer diversification beyond traditional equity and fixed-income securities. The asset class diversification of the Fund is designed to moderate overall price volatility. The Fund may add, remove, or substitute underlying funds at any time.
The Fund is managed with strategic or long-term asset class targets and target ranges. There is a rebalancing strategy that aligns with the target weights to identify asset classes that are either overweight or underweight. The Fund may shift asset class targets in response to normal evaluative processes, the shortening time horizon of the Fund, or changes in market forces or Fund circumstances.
In selecting underlying funds and target weights, the Fund considers both quantitative measures (e.g., past performance, expected levels of risk and returns, expense levels, diversification, and style consistency) and qualitative factors (e.g., organizational stability, investment experience, investment and risk management processes, and information, trading, and compliance systems). There are no minimum or maximum percentages of assets that the Fund must invest in a specific asset class or underlying fund.
The underlying funds invest in growth and value stocks of small, medium, and large market capitalization companies, fixed-income securities, domestic and foreign securities, securities denominated in foreign currencies, investment companies, securitized products, U.S. government and U.S. government-sponsored securities, and derivatives. A derivative is a financial arrangement, the value of which is derived from, or based on, a traditional security, asset, or market index. The underlying funds principally use futures, options, swaps (including, for example, credit default, interest rate, and currency swaps), and forwards in order to gain exposure to a variety of securities or asset classes or attempt to reduce risk.
The Fund’s asset allocation will become more conservative over time as investment goals near (for example, retirement, which is assumed to begin at age 65) and investors become more risk-averse. Approximately 10 years after its target year, the Fund’s underlying fund allocation is expected to match that of the Principal LifeTime Strategic Income Fund. At that time, the Fund may be combined with the Principal LifeTime Strategic Income Fund if the Board of Directors determines that the combination is in the best interests of Fund shareholders. It is expected that at the target date in the Fund’s name, the shareholder will begin gradually withdrawing the account’s value.
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Risk [Heading] rr_RiskHeading Principal Risks
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
The following information provides some indication of the risks of investing in the Fund. Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. You may get updated performance information at www.PrincipalAM.com.
The bar chart shows the investment returns of the Fund’s Institutional Class shares for each full calendar year of operations for 10 years (or, if shorter, the life of the Fund). The table shows for the last one, five, and ten calendar year periods (or, if shorter, the life of the Fund), how the Fund’s average annual total returns compare with those of one or more broad measures of market performance.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following information provides some indication of the risks of investing in the Fund.
Performance Additional Market Index [Text] rr_PerformanceAdditionalMarketIndex The S&P Target Date 2015 Index is included as an additional index for the Fund as it shows how the Fund’s performance compares with the returns of an index of funds with similar investment objectives.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.PrincipalAM.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.
Bar Chart [Heading] rr_BarChartHeading Total Returns as of December 31
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
Highest return for a quarter during the period of the bar chart above:
Q2 202011.02 %
Lowest return for a quarter during the period of the bar chart above:
Q1 2020(9.54)%
Performance Table Heading rr_PerformanceTableHeading Average Annual Total ReturnsFor the periods ended December 31, 2023
Performance Table Market Index Changed rr_PerformanceTableMarketIndexChanged Effective March 1, 2024, the Fund changed its primary broad-based index to the Bloomberg U.S. Aggregate Bond Index in order to meet the revised definition of “broad-based securities market index.”
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are shown for Institutional Class shares only and would be different for the other share classes.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock
After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. After-tax returns are shown for Institutional Class shares only and would be different for the other share classes.
Effective March 1, 2024, the Fund changed its primary broad-based index to the Bloomberg U.S. Aggregate Bond Index in order to meet the revised definition of “broad-based securities market index.” The S&P Target Date 2015 Index is included as an additional index for the Fund as it shows how the Fund’s performance compares with the returns of an index of funds with similar investment objectives.
PFI Prospectus | Principal LifeTime 2015 Fund | Risk Lose Money [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Many factors affect that value, and it is possible to lose money by investing in the Fund.
PFI Prospectus | Principal LifeTime 2015 Fund | Risk Not Insured Depository Institution [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
PFI Prospectus | Principal LifeTime 2015 Fund | Counterparty Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Counterparty Risk. Counterparty risk is the risk that the counterparty to a contract or other obligation will be unable or unwilling to honor its obligations.
PFI Prospectus | Principal LifeTime 2015 Fund | Derivatives Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Derivatives Risk. Derivatives may not move in the direction anticipated by the portfolio manager. Transactions in derivatives may increase volatility, cause the liquidation of portfolio positions when not advantageous to do so, and result in disproportionate losses that may be substantially greater than a fund’s initial investment.
•Credit Default Swaps. Credit default swaps involve special risks in addition to those associated with swaps generally because they are difficult to value, are highly susceptible to liquidity and credit risk, and generally pay a return to the party that has paid the premium only in the event of an actual default by the issuer of the underlying obligation (as opposed to a credit downgrade or other indication of financial difficulty). The protection “buyer” in a credit default contract may be obligated to pay the protection “seller” an up-front payment or a periodic stream of payments over the term of the contract, provided, generally, that no credit event on a reference obligation has occurred. If a credit event occurs, the seller generally must pay the buyer the “par value” (i.e., full notional value) of the swap in exchange for an equal face amount of deliverable obligations of the reference entity described in the swap, or the seller may be required to deliver the related net cash amount, if the swap is cash settled. The Fund may be either the buyer or seller in the transaction.
•Forward Contracts, Futures, and Swaps. Forward contracts, futures, and swaps involve specific risks, including: the imperfect correlation between the change in market value of the instruments held by the fund and the price of the forward contract, future, or swap; possible lack of a liquid secondary market for a forward contract, future, or swap and the resulting inability to close a forward contract, future, or swap when desired; counterparty risk; and if the fund has insufficient cash, it may have to sell securities from its portfolio to meet daily variation margin requirements.
•Options. Options involve specific risks, including: the imperfect correlation between the change in market value of the instruments held by the Fund and the price of the options; counterparty risk; difference in trading hours for the options markets and the markets for the underlying securities (rate movements can take place in the underlying markets that cannot be reflected in the options markets); and an insufficient liquid secondary market for particular options.
PFI Prospectus | Principal LifeTime 2015 Fund | Derivatives Risk, Credit Default Swaps Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Credit Default Swaps. Credit default swaps involve special risks in addition to those associated with swaps generally because they are difficult to value, are highly susceptible to liquidity and credit risk, and generally pay a return to the party that has paid the premium only in the event of an actual default by the issuer of the underlying obligation (as opposed to a credit downgrade or other indication of financial difficulty). The protection “buyer” in a credit default contract may be obligated to pay the protection “seller” an up-front payment or a periodic stream of payments over the term of the contract, provided, generally, that no credit event on a reference obligation has occurred. If a credit event occurs, the seller generally must pay the buyer the “par value” (i.e., full notional value) of the swap in exchange for an equal face amount of deliverable obligations of the reference entity described in the swap, or the seller may be required to deliver the related net cash amount, if the swap is cash settled. The Fund may be either the buyer or seller in the transaction.
PFI Prospectus | Principal LifeTime 2015 Fund | Derivatives Risk, Forward Contracts, Futures, And Swaps Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Forward Contracts, Futures, and Swaps. Forward contracts, futures, and swaps involve specific risks, including: the imperfect correlation between the change in market value of the instruments held by the fund and the price of the forward contract, future, or swap; possible lack of a liquid secondary market for a forward contract, future, or swap and the resulting inability to close a forward contract, future, or swap when desired; counterparty risk; and if the fund has insufficient cash, it may have to sell securities from its portfolio to meet daily variation margin requirements.
PFI Prospectus | Principal LifeTime 2015 Fund | Derivatives Risk, Options Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Options. Options involve specific risks, including: the imperfect correlation between the change in market value of the instruments held by the Fund and the price of the options; counterparty risk; difference in trading hours for the options markets and the markets for the underlying securities (rate movements can take place in the underlying markets that cannot be reflected in the options markets); and an insufficient liquid secondary market for particular options.
PFI Prospectus | Principal LifeTime 2015 Fund | Equity Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Equity Securities Risk. A variety of factors can negatively impact the value of equity securities held by a fund, including a decline in the issuer’s financial condition, unfavorable performance of the issuer’s sector or industry, or changes in response to overall market and economic conditions. A fund’s principal market segment(s) (such as market capitalization or style) may underperform other market segments or the equity markets as a whole.
•Growth Style Risk. Growth investing entails the risk that if growth companies do not increase their earnings at a rate expected by investors, the market price of their stock may decline significantly, even if earnings show an absolute increase. Growth company stocks also typically lack the dividend yield that can lessen price declines in market downturns.
•Smaller Companies Risk. Investments in smaller companies may involve greater risk and price volatility than investments in larger, more mature companies. Smaller companies may have limited product lines, markets, or financial resources; lack the competitive strength of larger companies; have less experienced managers; or depend on a few key employees. Their securities often are less widely held and trade less frequently and in lesser quantities, and their market prices often fluctuate more, than securities of larger companies.
•Value Style Risk. Value investing entails the risk that value stocks may continue to be undervalued by the market for extended periods, including the entire period during which the stock is held by a fund, or the events that would cause the stock price to increase may not occur as anticipated or at all. Moreover, a stock that appears to be undervalued actually may be appropriately priced at a low level and, therefore, would not be profitable for the fund.
PFI Prospectus | Principal LifeTime 2015 Fund | Equity Securities Risk, Growth Style Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Growth Style Risk. Growth investing entails the risk that if growth companies do not increase their earnings at a rate expected by investors, the market price of their stock may decline significantly, even if earnings show an absolute increase. Growth company stocks also typically lack the dividend yield that can lessen price declines in market downturns.
PFI Prospectus | Principal LifeTime 2015 Fund | Equity Securities Risk, Smaller Companies Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Smaller Companies Risk. Investments in smaller companies may involve greater risk and price volatility than investments in larger, more mature companies. Smaller companies may have limited product lines, markets, or financial resources; lack the competitive strength of larger companies; have less experienced managers; or depend on a few key employees. Their securities often are less widely held and trade less frequently and in lesser quantities, and their market prices often fluctuate more, than securities of larger companies.
PFI Prospectus | Principal LifeTime 2015 Fund | Equity Securities Risk, Value Style Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Value Style Risk. Value investing entails the risk that value stocks may continue to be undervalued by the market for extended periods, including the entire period during which the stock is held by a fund, or the events that would cause the stock price to increase may not occur as anticipated or at all. Moreover, a stock that appears to be undervalued actually may be appropriately priced at a low level and, therefore, would not be profitable for the fund.
PFI Prospectus | Principal LifeTime 2015 Fund | Fixed-Income Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Fixed-Income Securities Risk. Fixed-income securities are subject to interest rate, credit quality, and liquidity risks. The market value of fixed-income securities generally declines when interest rates rise, and increased interest rates may adversely affect the liquidity of certain fixed-income securities. Moreover, an issuer of fixed-income securities could default on its payment obligations due to increased interest rates or for other reasons.
PFI Prospectus | Principal LifeTime 2015 Fund | Foreign Currency Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Foreign Currency Risk. Risks of investing in securities denominated in, or that trade in, foreign (non-U.S.) currencies include changes in foreign exchange rates and foreign exchange restrictions.
PFI Prospectus | Principal LifeTime 2015 Fund | Foreign Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Foreign Securities Risk. The risks of foreign securities include loss of value as a result of: political or economic instability; nationalization, expropriation, or confiscatory taxation; settlement delays; and limited government regulation (including less stringent reporting, accounting, and disclosure standards than are required of U.S. companies).
PFI Prospectus | Principal LifeTime 2015 Fund | Fund Of Funds Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Fund of Funds Risk. Fund shareholders bear indirectly their proportionate share of the expenses of other investment companies (for example, other mutual funds or exchange-traded funds) in which the Fund invests (“underlying funds”). The Fund’s selection and weighting of asset classes and allocation of investments in underlying funds may cause it to underperform other funds with a similar investment objective. The Fund’s performance and risks correspond directly to the performance and risks of the underlying funds in which it invests, proportionately in accordance with the weightings of such investments, and there is no assurance that the underlying funds will achieve their investment objectives. Management of the Fund entails potential conflicts of interest: the Fund invests in affiliated underlying funds; and PGI and its affiliates may earn different fees from different underlying funds and may have an incentive to allocate more Fund assets to underlying funds from which they receive higher fees.
PFI Prospectus | Principal LifeTime 2015 Fund | Portfolio Duration Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Portfolio Duration Risk. Portfolio duration is a measure of the expected life of a fixed-income security and its sensitivity to changes in interest rates. The longer a fund’s average portfolio duration, the more sensitive the fund will be to changes in interest rates, which means funds with longer average portfolio durations may be more volatile than those with shorter durations.
PFI Prospectus | Principal LifeTime 2015 Fund | Redemption And Large Transaction Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Redemption and Large Transaction Risk. Ownership of the Fund’s shares may be concentrated in one or a few large investors (such as funds of funds, institutional investors, and asset allocation programs) that may redeem or purchase shares in large quantities. These transactions may cause the Fund to sell securities to meet redemptions or to invest additional cash at times it would not otherwise do so, which may result in increased transaction costs, increased expenses, changes to expense ratios, and adverse effects to Fund performance. Such transactions may also accelerate the realization of taxable income if sales of portfolio securities result in gains. Moreover, reallocations by large shareholders among share classes of a fund may result in changes to the expense ratios of affected classes, which may increase the expenses paid by shareholders of the class that experienced the redemption.
PFI Prospectus | Principal LifeTime 2015 Fund | Securitized Products Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Securitized Products Risk. Investments in securitized products are subject to risks similar to traditional fixed-income securities, such as credit, interest rate, liquidity, prepayment, extension, and default risk, as well as additional risks associated with the nature of the assets and the servicing of those assets. Unscheduled prepayments on securitized products may have to be reinvested at lower rates. A reduction in prepayments may increase the effective maturities of these securities, exposing them to the risk of decline in market value over time (extension risk).
PFI Prospectus | Principal LifeTime 2015 Fund | Target Date Fund Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Target Date Fund Risk. A target date fund should not be selected based solely on age or retirement date because there is no guarantee that this Fund will provide adequate income at or through retirement.
PFI Prospectus | Principal LifeTime 2015 Fund | U.S. Government Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock U.S. Government Securities Risk. Yields available from U.S. government securities are generally lower than yields from many other fixed-income securities. The value of U.S. government securities may be adversely impacted by changes in interest rates, changes in the credit rating of the U.S. government, or a default by the U.S. government.
PFI Prospectus | Principal LifeTime 2015 Fund | U.S. Government-Sponsored Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock U.S. Government-Sponsored Securities Risk. Securities issued by U.S. government-sponsored enterprises such as the Federal Home Loan Mortgage Corporation, the Federal National Mortgage Association, and the Federal Home Loan Banks are not issued or guaranteed by the U.S. government.
PFI Prospectus | Principal LifeTime 2015 Fund | Bloomberg U.S. Aggregate Bond Index (reflects no deduction for fees, expenses, or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
Label rr_AverageAnnualReturnLabel Bloomberg U.S. Aggregate Bond Index (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 5.53%
5 Years rr_AverageAnnualReturnYear05 1.10%
10 Years rr_AverageAnnualReturnYear10 1.81%
PFI Prospectus | Principal LifeTime 2015 Fund | S&P Target Date 2015 Index  
Prospectus [Line Items] rr_ProspectusLineItems  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
Label rr_AverageAnnualReturnLabel S&P Target Date 2015 Index (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 11.38%
5 Years rr_AverageAnnualReturnYear05 6.10%
10 Years rr_AverageAnnualReturnYear10 4.94%
PFI Prospectus | Principal LifeTime 2015 Fund | Institutional Class  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol LTINX
Shareholder Fee, Other rr_ShareholderFeeOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.02%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.51%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.53%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 54
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 170
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 296
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 665
Annual Return 2014 rr_AnnualReturn2014 5.08%
Annual Return 2015 rr_AnnualReturn2015 (1.18%)
Annual Return 2016 rr_AnnualReturn2016 5.55%
Annual Return 2017 rr_AnnualReturn2017 13.19%
Annual Return 2018 rr_AnnualReturn2018 (4.70%)
Annual Return 2019 rr_AnnualReturn2019 16.28%
Annual Return 2020 rr_AnnualReturn2020 11.87%
Annual Return 2021 rr_AnnualReturn2021 7.44%
Annual Return 2022 rr_AnnualReturn2022 (13.60%)
Annual Return 2023 rr_AnnualReturn2023 11.17%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Highest return for a quarter during the period of the bar chart above:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 11.02%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Lowest return for a quarter during the period of the bar chart above:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (9.54%)
Label rr_AverageAnnualReturnLabel Institutional Class Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 11.17%
5 Years rr_AverageAnnualReturnYear05 6.07%
10 Years rr_AverageAnnualReturnYear10 4.73%
PFI Prospectus | Principal LifeTime 2015 Fund | Institutional Class | After Taxes on Distributions  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Institutional Class Return After Taxes on Distributions
1 Year rr_AverageAnnualReturnYear01 9.50%
5 Years rr_AverageAnnualReturnYear05 3.84%
10 Years rr_AverageAnnualReturnYear10 2.63%
PFI Prospectus | Principal LifeTime 2015 Fund | Institutional Class | After Taxes on Distributions and Sales  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Institutional Class Return After Taxes on Distributions and Sale of Fund Shares
1 Year rr_AverageAnnualReturnYear01 7.02%
5 Years rr_AverageAnnualReturnYear05 4.28%
10 Years rr_AverageAnnualReturnYear10 3.19%
PFI Prospectus | Principal LifeTime 2015 Fund | Class R-1  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol LTSGX
Shareholder Fee, Other rr_ShareholderFeeOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.35%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.54%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.51%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.40%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 143
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 443
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 766
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,680
Label rr_AverageAnnualReturnLabel Class R-1 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 10.26%
5 Years rr_AverageAnnualReturnYear05 5.15%
10 Years rr_AverageAnnualReturnYear10 3.82%
PFI Prospectus | Principal LifeTime 2015 Fund | Class R-3  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol LTAPX
Shareholder Fee, Other rr_ShareholderFeeOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.33%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.51%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.09%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 111
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 347
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 601
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,329
Label rr_AverageAnnualReturnLabel Class R-3 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 10.60%
5 Years rr_AverageAnnualReturnYear05 5.46%
10 Years rr_AverageAnnualReturnYear10 4.14%
PFI Prospectus | Principal LifeTime 2015 Fund | Class R-4  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol LTSLX
Shareholder Fee, Other rr_ShareholderFeeOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.10%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.29%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.51%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.90%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 92
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 287
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 498
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,108
Label rr_AverageAnnualReturnLabel Class R-4 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 10.72%
5 Years rr_AverageAnnualReturnYear05 5.65%
10 Years rr_AverageAnnualReturnYear10 4.33%
PFI Prospectus | Principal LifeTime 2015 Fund | Class R-5  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol LTPFX
Shareholder Fee, Other rr_ShareholderFeeOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.27%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.51%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.78%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 80
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 249
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 433
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 966
Label rr_AverageAnnualReturnLabel Class R-5 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 10.84%
5 Years rr_AverageAnnualReturnYear05 5.77%
10 Years rr_AverageAnnualReturnYear10 4.45%
PFI Prospectus | Principal LifeTime 2020 Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading PRINCIPAL LIFETIME 2020 FUND
Objective [Heading] rr_ObjectiveHeading Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The Fund seeks a total return consisting of long-term growth of capital and current income.
Expense [Heading] rr_ExpenseHeading Fees and Expenses of the Fund
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock
This table describes the fees and expenses that you may pay if you buy, hold, and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $100,000 in Class A Shares of Principal Funds, Inc. More information about these and other discounts is available from your financial intermediary and in “Choosing a Share Class and The Costs of Investing” beginning on page 426 of the Fund’s Prospectus, Appendix B to the Prospectus titled “Intermediary-Specific Sales Charge Waivers and Reductions,” and “Multiple Class Structure” beginning on page 70 of the Fund’s Statement of Additional Information.
If you purchase Institutional Class shares through certain programs offered by certain financial intermediaries, you may be required to pay a commission and/or other forms of compensation to the broker, or to your Financial Professional or other financial intermediary.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder Fees (fees paid directly from your investment)
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock The Fund and each underlying fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs. These costs, which are not reflected in Annual Fund Operating Expenses or in the Example, affect the Fund’s and the underlying fund's performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 9.8% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 9.80%
Expense Breakpoint Discounts [Text] rr_ExpenseBreakpointDiscounts You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $100,000 in Class A Shares of Principal Funds, Inc.
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 100,000
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, No Redemption, By Year, Caption [Text] rr_ExpenseExampleNoRedemptionByYearCaption With respect to Class J shares, you would pay the following expenses if you did not redeem your shares (all other classes would be the same as in the above example):
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
The Fund operates as a “target date fund” that invests according to an asset allocation strategy designed for investors having a retirement investment goal close to the year in the Fund’s name. The Fund is a fund of funds and invests in underlying funds of Principal Funds, Inc. (“PFI”). Its underlying funds consist of domestic and foreign equity funds, fixed-income funds, real asset funds, and other funds that aim to offer diversification beyond traditional equity and fixed-income securities. The asset class diversification of the Fund is designed to moderate overall price volatility. The Fund may add, remove, or substitute underlying funds at any time.
The Fund is managed with strategic or long-term asset class targets and target ranges. There is a rebalancing strategy that aligns with the target weights to identify asset classes that are either overweight or underweight. The Fund may shift asset class targets in response to normal evaluative processes, the shortening time horizon of the Fund, or changes in market forces or Fund circumstances.
In selecting underlying funds and target weights, the Fund considers both quantitative measures (e.g., past performance, expected levels of risk and returns, expense levels, diversification, and style consistency) and qualitative factors (e.g., organizational stability, investment experience, investment and risk management processes, and information, trading, and compliance systems). There are no minimum or maximum percentages of assets that the Fund must invest in a specific asset class or underlying fund.
The underlying funds invest in growth and value stocks of small, medium, and large market capitalization companies, fixed-income securities, domestic and foreign securities, securities denominated in foreign currencies, investment companies, U.S. government and U.S. government-sponsored securities, and derivatives. A derivative is a financial arrangement, the value of which is derived from, or based on, a traditional security, asset, or market index. The underlying funds principally use futures, options, swaps (including, for example, credit default, interest rate, and currency swaps), and forwards in order to gain exposure to a variety of securities or asset classes or attempt to reduce risk.
The Fund’s asset allocation will become more conservative over time as investment goals near (for example, retirement, which is assumed to begin at age 65) and investors become more risk-averse. Approximately 10 years after its target year, the Fund’s underlying fund allocation is expected to match that of the Principal LifeTime Strategic Income Fund. At that time, the Fund may be combined with the Principal LifeTime Strategic Income Fund if the Board of Directors determines that the combination is in the best interests of Fund shareholders. It is expected that at the target date in the Fund’s name, the shareholder will begin gradually withdrawing the account’s value.
LT Glidepath.jpg
Risk [Heading] rr_RiskHeading Principal Risks
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
The following information provides some indication of the risks of investing in the Fund. Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. You may get updated performance information at www.PrincipalAM.com.
The bar chart shows the investment returns of the Fund’s Class A shares for each full calendar year of operations for 10 years (or, if shorter, the life of the Fund). These annual returns do not reflect sales charges on Class A shares; if they did, results would be lower. The table shows for the last one, five, and ten calendar year periods (or, if shorter, the life of the Fund), how the Fund’s average annual total returns compare with those of one or more broad measures of market performance.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following information provides some indication of the risks of investing in the Fund.
Performance Additional Market Index [Text] rr_PerformanceAdditionalMarketIndex The S&P Target Date 2020 Index is included as an additional index for the Fund as it shows how the Fund’s performance compares with the returns of an index of funds with similar investment objectives.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.PrincipalAM.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.
Bar Chart [Heading] rr_BarChartHeading Total Returns as of December 31
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
Highest return for a quarter during the period of the bar chart above:Q2 202012.29 %
Lowest return for a quarter during the period of the bar chart above:Q1 2020(11.66)%
Performance Table Heading rr_PerformanceTableHeading Average Annual Total ReturnsFor the periods ended December 31, 2023
Performance Table Market Index Changed rr_PerformanceTableMarketIndexChanged Effective March 1, 2024, the Fund changed its primary broad-based index to the Bloomberg U.S. Aggregate Bond Index in order to meet the revised definition of “broad-based securities market index.”
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are shown for Class A shares only and would be different for the other share classes.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock
After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. After-tax returns are shown for Class A shares only and would be different for the other share classes.
Effective March 1, 2024, the Fund changed its primary broad-based index to the Bloomberg U.S. Aggregate Bond Index in order to meet the revised definition of “broad-based securities market index.” The S&P Target Date 2020 Index is included as an additional index for the Fund as it shows how the Fund’s performance compares with the returns of an index of funds with similar investment objectives.
PFI Prospectus | Principal LifeTime 2020 Fund | Risk Lose Money [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Many factors affect that value, and it is possible to lose money by investing in the Fund.
PFI Prospectus | Principal LifeTime 2020 Fund | Risk Not Insured Depository Institution [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
PFI Prospectus | Principal LifeTime 2020 Fund | Counterparty Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Counterparty Risk. Counterparty risk is the risk that the counterparty to a contract or other obligation will be unable or unwilling to honor its obligations.
PFI Prospectus | Principal LifeTime 2020 Fund | Derivatives Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Derivatives Risk. Derivatives may not move in the direction anticipated by the portfolio manager. Transactions in derivatives may increase volatility, cause the liquidation of portfolio positions when not advantageous to do so, and result in disproportionate losses that may be substantially greater than a fund’s initial investment.
•Credit Default Swaps. Credit default swaps involve special risks in addition to those associated with swaps generally because they are difficult to value, are highly susceptible to liquidity and credit risk, and generally pay a return to the party that has paid the premium only in the event of an actual default by the issuer of the underlying obligation (as opposed to a credit downgrade or other indication of financial difficulty). The protection “buyer” in a credit default contract may be obligated to pay the protection “seller” an up-front payment or a periodic stream of payments over the term of the contract, provided, generally, that no credit event on a reference obligation has occurred. If a credit event occurs, the seller generally must pay the buyer the “par value” (i.e., full notional value) of the swap in exchange for an equal face amount of deliverable obligations of the reference entity described in the swap, or the seller may be required to deliver the related net cash amount, if the swap is cash settled. The Fund may be either the buyer or seller in the transaction.
•Forward Contracts, Futures, and Swaps. Forward contracts, futures, and swaps involve specific risks, including: the imperfect correlation between the change in market value of the instruments held by the fund and the price of the forward contract, future, or swap; possible lack of a liquid secondary market for a forward contract, future, or swap and the resulting inability to close a forward contract, future, or swap when desired; counterparty risk; and if the fund has insufficient cash, it may have to sell securities from its portfolio to meet daily variation margin requirements.
•Options. Options involve specific risks, including: the imperfect correlation between the change in market value of the instruments held by the Fund and the price of the options; counterparty risk; difference in trading hours for the options markets and the markets for the underlying securities (rate movements can take place in the underlying markets that cannot be reflected in the options markets); and an insufficient liquid secondary market for particular options.
PFI Prospectus | Principal LifeTime 2020 Fund | Derivatives Risk, Credit Default Swaps Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Credit Default Swaps. Credit default swaps involve special risks in addition to those associated with swaps generally because they are difficult to value, are highly susceptible to liquidity and credit risk, and generally pay a return to the party that has paid the premium only in the event of an actual default by the issuer of the underlying obligation (as opposed to a credit downgrade or other indication of financial difficulty). The protection “buyer” in a credit default contract may be obligated to pay the protection “seller” an up-front payment or a periodic stream of payments over the term of the contract, provided, generally, that no credit event on a reference obligation has occurred. If a credit event occurs, the seller generally must pay the buyer the “par value” (i.e., full notional value) of the swap in exchange for an equal face amount of deliverable obligations of the reference entity described in the swap, or the seller may be required to deliver the related net cash amount, if the swap is cash settled. The Fund may be either the buyer or seller in the transaction.
PFI Prospectus | Principal LifeTime 2020 Fund | Derivatives Risk, Forward Contracts, Futures, And Swaps Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Forward Contracts, Futures, and Swaps. Forward contracts, futures, and swaps involve specific risks, including: the imperfect correlation between the change in market value of the instruments held by the fund and the price of the forward contract, future, or swap; possible lack of a liquid secondary market for a forward contract, future, or swap and the resulting inability to close a forward contract, future, or swap when desired; counterparty risk; and if the fund has insufficient cash, it may have to sell securities from its portfolio to meet daily variation margin requirements.
PFI Prospectus | Principal LifeTime 2020 Fund | Derivatives Risk, Options Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Options. Options involve specific risks, including: the imperfect correlation between the change in market value of the instruments held by the Fund and the price of the options; counterparty risk; difference in trading hours for the options markets and the markets for the underlying securities (rate movements can take place in the underlying markets that cannot be reflected in the options markets); and an insufficient liquid secondary market for particular options.
PFI Prospectus | Principal LifeTime 2020 Fund | Equity Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Equity Securities Risk. A variety of factors can negatively impact the value of equity securities held by a fund, including a decline in the issuer’s financial condition, unfavorable performance of the issuer’s sector or industry, or changes in response to overall market and economic conditions. A fund’s principal market segment(s) (such as market capitalization or style) may underperform other market segments or the equity markets as a whole.
•Growth Style Risk. Growth investing entails the risk that if growth companies do not increase their earnings at a rate expected by investors, the market price of their stock may decline significantly, even if earnings show an absolute increase. Growth company stocks also typically lack the dividend yield that can lessen price declines in market downturns.
•Smaller Companies Risk. Investments in smaller companies may involve greater risk and price volatility than investments in larger, more mature companies. Smaller companies may have limited product lines, markets, or financial resources; lack the competitive strength of larger companies; have less experienced managers; or depend on a few key employees. Their securities often are less widely held and trade less frequently and in lesser quantities, and their market prices often fluctuate more, than securities of larger companies.
•Value Style Risk. Value investing entails the risk that value stocks may continue to be undervalued by the market for extended periods, including the entire period during which the stock is held by a fund, or the events that would cause the stock price to increase may not occur as anticipated or at all. Moreover, a stock that appears to be undervalued actually may be appropriately priced at a low level and, therefore, would not be profitable for the fund.
PFI Prospectus | Principal LifeTime 2020 Fund | Equity Securities Risk, Growth Style Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Growth Style Risk. Growth investing entails the risk that if growth companies do not increase their earnings at a rate expected by investors, the market price of their stock may decline significantly, even if earnings show an absolute increase. Growth company stocks also typically lack the dividend yield that can lessen price declines in market downturns.
PFI Prospectus | Principal LifeTime 2020 Fund | Equity Securities Risk, Smaller Companies Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Smaller Companies Risk. Investments in smaller companies may involve greater risk and price volatility than investments in larger, more mature companies. Smaller companies may have limited product lines, markets, or financial resources; lack the competitive strength of larger companies; have less experienced managers; or depend on a few key employees. Their securities often are less widely held and trade less frequently and in lesser quantities, and their market prices often fluctuate more, than securities of larger companies.
PFI Prospectus | Principal LifeTime 2020 Fund | Equity Securities Risk, Value Style Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Value Style Risk. Value investing entails the risk that value stocks may continue to be undervalued by the market for extended periods, including the entire period during which the stock is held by a fund, or the events that would cause the stock price to increase may not occur as anticipated or at all. Moreover, a stock that appears to be undervalued actually may be appropriately priced at a low level and, therefore, would not be profitable for the fund.
PFI Prospectus | Principal LifeTime 2020 Fund | Fixed-Income Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Fixed-Income Securities Risk. Fixed-income securities are subject to interest rate, credit quality, and liquidity risks. The market value of fixed-income securities generally declines when interest rates rise, and increased interest rates may adversely affect the liquidity of certain fixed-income securities. Moreover, an issuer of fixed-income securities could default on its payment obligations due to increased interest rates or for other reasons.
PFI Prospectus | Principal LifeTime 2020 Fund | Foreign Currency Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Foreign Currency Risk. Risks of investing in securities denominated in, or that trade in, foreign (non-U.S.) currencies include changes in foreign exchange rates and foreign exchange restrictions.
PFI Prospectus | Principal LifeTime 2020 Fund | Foreign Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Foreign Securities Risk. The risks of foreign securities include loss of value as a result of: political or economic instability; nationalization, expropriation, or confiscatory taxation; settlement delays; and limited government regulation (including less stringent reporting, accounting, and disclosure standards than are required of U.S. companies).
PFI Prospectus | Principal LifeTime 2020 Fund | Fund Of Funds Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Fund of Funds Risk. Fund shareholders bear indirectly their proportionate share of the expenses of other investment companies (for example, other mutual funds or exchange-traded funds) in which the Fund invests (“underlying funds”). The Fund’s selection and weighting of asset classes and allocation of investments in underlying funds may cause it to underperform other funds with a similar investment objective. The Fund’s performance and risks correspond directly to the performance and risks of the underlying funds in which it invests, proportionately in accordance with the weightings of such investments, and there is no assurance that the underlying funds will achieve their investment objectives. Management of the Fund entails potential conflicts of interest: the Fund invests in affiliated underlying funds; and PGI and its affiliates may earn different fees from different underlying funds and may have an incentive to allocate more Fund assets to underlying funds from which they receive higher fees.
PFI Prospectus | Principal LifeTime 2020 Fund | Portfolio Duration Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Portfolio Duration Risk. Portfolio duration is a measure of the expected life of a fixed-income security and its sensitivity to changes in interest rates. The longer a fund’s average portfolio duration, the more sensitive the fund will be to changes in interest rates, which means funds with longer average portfolio durations may be more volatile than those with shorter durations.
PFI Prospectus | Principal LifeTime 2020 Fund | Redemption And Large Transaction Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Redemption and Large Transaction Risk. Ownership of the Fund’s shares may be concentrated in one or a few large investors (such as funds of funds, institutional investors, and asset allocation programs) that may redeem or purchase shares in large quantities. These transactions may cause the Fund to sell securities to meet redemptions or to invest additional cash at times it would not otherwise do so, which may result in increased transaction costs, increased expenses, changes to expense ratios, and adverse effects to Fund performance. Such transactions may also accelerate the realization of taxable income if sales of portfolio securities result in gains. Moreover, reallocations by large shareholders among share classes of a fund may result in changes to the expense ratios of affected classes, which may increase the expenses paid by shareholders of the class that experienced the redemption.
PFI Prospectus | Principal LifeTime 2020 Fund | Securitized Products Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Securitized Products Risk. Investments in securitized products are subject to risks similar to traditional fixed-income securities, such as credit, interest rate, liquidity, prepayment, extension, and default risk, as well as additional risks associated with the nature of the assets and the servicing of those assets. Unscheduled prepayments on securitized products may have to be reinvested at lower rates. A reduction in prepayments may increase the effective maturities of these securities, exposing them to the risk of decline in market value over time (extension risk).
PFI Prospectus | Principal LifeTime 2020 Fund | Target Date Fund Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Target Date Fund Risk. A target date fund should not be selected based solely on age or retirement date because there is no guarantee that this Fund will provide adequate income at or through retirement.
PFI Prospectus | Principal LifeTime 2020 Fund | U.S. Government Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
U.S. Government Securities Risk. Yields available from U.S. government securities are generally lower than yields from many other fixed-income securities. The value of U.S. government securities may be adversely impacted by changes in interest rates, changes in the credit rating of the U.S. government, or a default by the U.S. government.
PFI Prospectus | Principal LifeTime 2020 Fund | U.S. Government-Sponsored Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
U.S. Government-Sponsored Securities Risk. Securities issued by U.S. government-sponsored enterprises such as the Federal Home Loan Mortgage Corporation, the Federal National Mortgage Association, and the Federal Home Loan Banks are not issued or guaranteed by the U.S. government.
PFI Prospectus | Principal LifeTime 2020 Fund | Bloomberg U.S. Aggregate Bond Index (reflects no deduction for fees, expenses, or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
Label rr_AverageAnnualReturnLabel Bloomberg U.S. Aggregate Bond Index (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 5.53%
5 Years rr_AverageAnnualReturnYear05 1.10%
10 Years rr_AverageAnnualReturnYear10 1.81%
PFI Prospectus | Principal LifeTime 2020 Fund | S&P Target Date 2020 Index (reflects no deduction for fees, expenses, or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
Label rr_AverageAnnualReturnLabel S&P Target Date 2020 Index (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 12.32%
5 Years rr_AverageAnnualReturnYear05 6.47%
10 Years rr_AverageAnnualReturnYear10 5.28%
PFI Prospectus | Principal LifeTime 2020 Fund | Class A  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PTBAX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 3.75%
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.13%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.53%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.91%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 464
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 654
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 860
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,453
Annual Return 2014 rr_AnnualReturn2014 5.21%
Annual Return 2015 rr_AnnualReturn2015 (1.53%)
Annual Return 2016 rr_AnnualReturn2016 5.41%
Annual Return 2017 rr_AnnualReturn2017 14.61%
Annual Return 2018 rr_AnnualReturn2018 (6.11%)
Annual Return 2019 rr_AnnualReturn2019 18.00%
Annual Return 2020 rr_AnnualReturn2020 12.31%
Annual Return 2021 rr_AnnualReturn2021 8.80%
Annual Return 2022 rr_AnnualReturn2022 (14.71%)
Annual Return 2023 rr_AnnualReturn2023 11.80%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Highest return for a quarter during the period of the bar chart above:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 12.29%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Lowest return for a quarter during the period of the bar chart above:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (11.66%)
Label rr_AverageAnnualReturnLabel Class A Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 7.63%
5 Years rr_AverageAnnualReturnYear05 5.76%
10 Years rr_AverageAnnualReturnYear10 4.51%
PFI Prospectus | Principal LifeTime 2020 Fund | Class A | After Taxes on Distributions  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Class A Return After Taxes on Distributions
1 Year rr_AverageAnnualReturnYear01 6.13%
5 Years rr_AverageAnnualReturnYear05 3.73%
10 Years rr_AverageAnnualReturnYear10 2.70%
PFI Prospectus | Principal LifeTime 2020 Fund | Class A | After Taxes on Distributions and Sales  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Class A Return After Taxes on Distributions and Sale of Fund Shares
1 Year rr_AverageAnnualReturnYear01 5.00%
5 Years rr_AverageAnnualReturnYear05 4.14%
10 Years rr_AverageAnnualReturnYear10 3.12%
PFI Prospectus | Principal LifeTime 2020 Fund | Class J  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PLFJX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.15%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.03%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.53%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.71%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 173
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 227
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 395
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 883
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 73
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 227
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 395
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 883
Label rr_AverageAnnualReturnLabel Class J Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 10.99%
5 Years rr_AverageAnnualReturnYear05 6.78%
10 Years rr_AverageAnnualReturnYear10 5.09%
PFI Prospectus | Principal LifeTime 2020 Fund | Institutional Class  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PLWIX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.01%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.53%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.54%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 55
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 173
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 302
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 677
Label rr_AverageAnnualReturnLabel Institutional Class Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 12.25%
5 Years rr_AverageAnnualReturnYear05 6.95%
10 Years rr_AverageAnnualReturnYear10 5.30%
PFI Prospectus | Principal LifeTime 2020 Fund | Class R-1  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PWASX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.35%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.53%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.53%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.41%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 144
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 446
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 771
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,691
Label rr_AverageAnnualReturnLabel Class R-1 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 11.26%
5 Years rr_AverageAnnualReturnYear05 6.02%
10 Years rr_AverageAnnualReturnYear10 4.37%
PFI Prospectus | Principal LifeTime 2020 Fund | Class R-3  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PTBMX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.32%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.53%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.10%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 112
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 350
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 606
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,340
Label rr_AverageAnnualReturnLabel Class R-3 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 11.64%
5 Years rr_AverageAnnualReturnYear05 6.35%
10 Years rr_AverageAnnualReturnYear10 4.70%
PFI Prospectus | Principal LifeTime 2020 Fund | Class R-4  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PTBSX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.10%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.28%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.53%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.91%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 93
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 290
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 504
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,120
Label rr_AverageAnnualReturnLabel Class R-4 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 11.82%
5 Years rr_AverageAnnualReturnYear05 6.55%
10 Years rr_AverageAnnualReturnYear10 4.90%
PFI Prospectus | Principal LifeTime 2020 Fund | Class R-5  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PTBPX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.26%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.53%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.79%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 81
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 252
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 439
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 978
Label rr_AverageAnnualReturnLabel Class R-5 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 11.93%
5 Years rr_AverageAnnualReturnYear05 6.67%
10 Years rr_AverageAnnualReturnYear10 5.02%
PFI Prospectus | Principal LifeTime 2025 Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading PRINCIPAL LIFETIME 2025 FUND
Objective [Heading] rr_ObjectiveHeading Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The Fund seeks a total return consisting of long-term growth of capital and current income.
Expense [Heading] rr_ExpenseHeading Fees and Expenses of the Fund
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock
This table describes the fees and expenses that you may pay if you buy, hold, and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below.
If you purchase Institutional Class shares through certain programs offered by certain financial intermediaries, you may be required to pay a commission and/or other forms of compensation to the broker, or to your Financial Professional or other financial intermediary.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder Fees (fees paid directly from your investment):
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock The Fund and each underlying fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs. These costs, which are not reflected in Annual Fund Operating Expenses or in the Example, affect the Fund’s and the underlying fund's performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 14.4% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 14.40%
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
The Fund operates as a “target date fund” that invests according to an asset allocation strategy designed for investors having a retirement investment goal close to the year in the Fund’s name. The Fund is a fund of funds and invests in underlying funds of Principal Funds, Inc. (“PFI”). Its underlying funds consist of domestic and foreign equity funds, fixed-income funds, real asset funds, and other funds that aim to offer diversification beyond traditional equity and fixed-income securities. The asset class diversification of the Fund is designed to moderate overall price volatility. The Fund may add, remove, or substitute underlying funds at any time.
The Fund is managed with strategic or long-term asset class targets and target ranges. There is a rebalancing strategy that aligns with the target weights to identify asset classes that are either overweight or underweight. The Fund may shift asset class targets in response to normal evaluative processes, the shortening time horizon of the Fund, or changes in market forces or Fund circumstances.
In selecting underlying funds and target weights, the Fund considers both quantitative measures (e.g., past performance, expected levels of risk and returns, expense levels, diversification, and style consistency) and qualitative factors (e.g., organizational stability, investment experience, investment and risk management processes, and information, trading, and compliance systems). There are no minimum or maximum percentages of assets that the Fund must invest in a specific asset class or underlying fund.
The underlying funds invest in growth and value stocks of small, medium, and large market capitalization companies, fixed-income securities, domestic and foreign securities, securities denominated in foreign currencies, investment companies, U.S. government and U.S. government-sponsored securities, and derivatives. A derivative is a financial arrangement, the value of which is derived from, or based on, a traditional security, asset, or market index. The underlying funds principally use futures, options, swaps (including, for example, credit default, interest rate, and currency swaps), and forwards in order to gain exposure to a variety of securities or asset classes or attempt to reduce risk.
The Fund’s asset allocation will become more conservative over time as investment goals near (for example, retirement, which is assumed to begin at age 65) and investors become more risk-averse. Approximately 10 years after its target year, the Fund’s underlying fund allocation is expected to match that of the Principal LifeTime Strategic Income Fund. At that time, the Fund may be combined with the Principal LifeTime Strategic Income Fund if the Board of Directors determines that the combination is in the best interests of Fund shareholders. It is expected that at the target date in the Fund’s name, the shareholder will begin gradually withdrawing the account’s value.
LT Glidepath.jpg
Risk [Heading] rr_RiskHeading Principal Risks
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
The following information provides some indication of the risks of investing in the Fund. Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. You may get updated performance information at www.PrincipalAM.com.
The bar chart shows the investment returns of the Fund’s Institutional Class shares for each full calendar year of operations for 10 years (or, if shorter, the life of the Fund). The table shows for the last one, five, and ten calendar year periods (or, if shorter, the life of the Fund), how the Fund’s average annual total returns compare with those of one or more broad measures of market performance.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following information provides some indication of the risks of investing in the Fund.
Performance Additional Market Index [Text] rr_PerformanceAdditionalMarketIndex The S&P Target Date 2025 Index is included as an additional index for the Fund as it shows how the Fund’s performance compares with the returns of an index of funds with similar investment objectives.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.PrincipalAM.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.
Bar Chart [Heading] rr_BarChartHeading Total Returns as of December 31
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
Highest return for a quarter during the period of the bar chart above:
Q2 202014.07 %
Lowest return for a quarter during the period of the bar chart above:
Q1 2020(13.80)%
Performance Table Heading rr_PerformanceTableHeading Average Annual Total ReturnsFor the periods ended December 31, 2023
Performance Table Market Index Changed rr_PerformanceTableMarketIndexChanged Effective March 1, 2024, the Fund changed its primary broad-based index to the Bloomberg U.S. Aggregate Bond Index in order to meet the revised definition of “broad-based securities market index.”
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are shown for Institutional Class shares only and would be different for the other share classes.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock
After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. After-tax returns are shown for Institutional Class shares only and would be different for the other share classes.
Effective March 1, 2024, the Fund changed its primary broad-based index to the Bloomberg U.S. Aggregate Bond Index in order to meet the revised definition of “broad-based securities market index.” The S&P Target Date 2025 Index is included as an additional index for the Fund as it shows how the Fund’s performance compares with the returns of an index of funds with similar investment objectives.
PFI Prospectus | Principal LifeTime 2025 Fund | Risk Lose Money [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Many factors affect that value, and it is possible to lose money by investing in the Fund.
PFI Prospectus | Principal LifeTime 2025 Fund | Risk Not Insured Depository Institution [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
PFI Prospectus | Principal LifeTime 2025 Fund | Counterparty Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Counterparty Risk. Counterparty risk is the risk that the counterparty to a contract or other obligation will be unable or unwilling to honor its obligations.
PFI Prospectus | Principal LifeTime 2025 Fund | Derivatives Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Derivatives Risk. Derivatives may not move in the direction anticipated by the portfolio manager. Transactions in derivatives may increase volatility, cause the liquidation of portfolio positions when not advantageous to do so, and result in disproportionate losses that may be substantially greater than a fund’s initial investment.
•Credit Default Swaps. Credit default swaps involve special risks in addition to those associated with swaps generally because they are difficult to value, are highly susceptible to liquidity and credit risk, and generally pay a return to the party that has paid the premium only in the event of an actual default by the issuer of the underlying obligation (as opposed to a credit downgrade or other indication of financial difficulty). The protection “buyer” in a credit default contract may be obligated to pay the protection “seller” an up-front payment or a periodic stream of payments over the term of the contract, provided, generally, that no credit event on a reference obligation has occurred. If a credit event occurs, the seller generally must pay the buyer the “par value” (i.e., full notional value) of the swap in exchange for an equal face amount of deliverable obligations of the reference entity described in the swap, or the seller may be required to deliver the related net cash amount, if the swap is cash settled. The Fund may be either the buyer or seller in the transaction.
•Forward Contracts, Futures, and Swaps. Forward contracts, futures, and swaps involve specific risks, including: the imperfect correlation between the change in market value of the instruments held by the fund and the price of the forward contract, future, or swap; possible lack of a liquid secondary market for a forward contract, future, or swap and the resulting inability to close a forward contract, future, or swap when desired; counterparty risk; and if the fund has insufficient cash, it may have to sell securities from its portfolio to meet daily variation margin requirements.
•Options. Options involve specific risks, including: the imperfect correlation between the change in market value of the instruments held by the Fund and the price of the options; counterparty risk; difference in trading hours for the options markets and the markets for the underlying securities (rate movements can take place in the underlying markets that cannot be reflected in the options markets); and an insufficient liquid secondary market for particular options.
PFI Prospectus | Principal LifeTime 2025 Fund | Derivatives Risk, Credit Default Swaps Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Credit Default Swaps. Credit default swaps involve special risks in addition to those associated with swaps generally because they are difficult to value, are highly susceptible to liquidity and credit risk, and generally pay a return to the party that has paid the premium only in the event of an actual default by the issuer of the underlying obligation (as opposed to a credit downgrade or other indication of financial difficulty). The protection “buyer” in a credit default contract may be obligated to pay the protection “seller” an up-front payment or a periodic stream of payments over the term of the contract, provided, generally, that no credit event on a reference obligation has occurred. If a credit event occurs, the seller generally must pay the buyer the “par value” (i.e., full notional value) of the swap in exchange for an equal face amount of deliverable obligations of the reference entity described in the swap, or the seller may be required to deliver the related net cash amount, if the swap is cash settled. The Fund may be either the buyer or seller in the transaction.
PFI Prospectus | Principal LifeTime 2025 Fund | Derivatives Risk, Forward Contracts, Futures, And Swaps Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Forward Contracts, Futures, and Swaps. Forward contracts, futures, and swaps involve specific risks, including: the imperfect correlation between the change in market value of the instruments held by the fund and the price of the forward contract, future, or swap; possible lack of a liquid secondary market for a forward contract, future, or swap and the resulting inability to close a forward contract, future, or swap when desired; counterparty risk; and if the fund has insufficient cash, it may have to sell securities from its portfolio to meet daily variation margin requirements.
PFI Prospectus | Principal LifeTime 2025 Fund | Derivatives Risk, Options Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Options. Options involve specific risks, including: the imperfect correlation between the change in market value of the instruments held by the Fund and the price of the options; counterparty risk; difference in trading hours for the options markets and the markets for the underlying securities (rate movements can take place in the underlying markets that cannot be reflected in the options markets); and an insufficient liquid secondary market for particular options.
PFI Prospectus | Principal LifeTime 2025 Fund | Equity Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Equity Securities Risk. A variety of factors can negatively impact the value of equity securities held by a fund, including a decline in the issuer’s financial condition, unfavorable performance of the issuer’s sector or industry, or changes in response to overall market and economic conditions. A fund’s principal market segment(s) (such as market capitalization or style) may underperform other market segments or the equity markets as a whole.
•Growth Style Risk. Growth investing entails the risk that if growth companies do not increase their earnings at a rate expected by investors, the market price of their stock may decline significantly, even if earnings show an absolute increase. Growth company stocks also typically lack the dividend yield that can lessen price declines in market downturns.
•Smaller Companies Risk. Investments in smaller companies may involve greater risk and price volatility than investments in larger, more mature companies. Smaller companies may have limited product lines, markets, or financial resources; lack the competitive strength of larger companies; have less experienced managers; or depend on a few key employees. Their securities often are less widely held and trade less frequently and in lesser quantities, and their market prices often fluctuate more, than securities of larger companies.
•Value Style Risk. Value investing entails the risk that value stocks may continue to be undervalued by the market for extended periods, including the entire period during which the stock is held by a fund, or the events that would cause the stock price to increase may not occur as anticipated or at all. Moreover, a stock that appears to be undervalued actually may be appropriately priced at a low level and, therefore, would not be profitable for the fund.
PFI Prospectus | Principal LifeTime 2025 Fund | Equity Securities Risk, Growth Style Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Growth Style Risk. Growth investing entails the risk that if growth companies do not increase their earnings at a rate expected by investors, the market price of their stock may decline significantly, even if earnings show an absolute increase. Growth company stocks also typically lack the dividend yield that can lessen price declines in market downturns.
PFI Prospectus | Principal LifeTime 2025 Fund | Equity Securities Risk, Smaller Companies Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Smaller Companies Risk. Investments in smaller companies may involve greater risk and price volatility than investments in larger, more mature companies. Smaller companies may have limited product lines, markets, or financial resources; lack the competitive strength of larger companies; have less experienced managers; or depend on a few key employees. Their securities often are less widely held and trade less frequently and in lesser quantities, and their market prices often fluctuate more, than securities of larger companies.
PFI Prospectus | Principal LifeTime 2025 Fund | Equity Securities Risk, Value Style Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Value Style Risk. Value investing entails the risk that value stocks may continue to be undervalued by the market for extended periods, including the entire period during which the stock is held by a fund, or the events that would cause the stock price to increase may not occur as anticipated or at all. Moreover, a stock that appears to be undervalued actually may be appropriately priced at a low level and, therefore, would not be profitable for the fund.
PFI Prospectus | Principal LifeTime 2025 Fund | Fixed-Income Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Fixed-Income Securities Risk. Fixed-income securities are subject to interest rate, credit quality, and liquidity risks. The market value of fixed-income securities generally declines when interest rates rise, and increased interest rates may adversely affect the liquidity of certain fixed-income securities. Moreover, an issuer of fixed-income securities could default on its payment obligations due to increased interest rates or for other reasons.
PFI Prospectus | Principal LifeTime 2025 Fund | Foreign Currency Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Foreign Currency Risk. Risks of investing in securities denominated in, or that trade in, foreign (non-U.S.) currencies include changes in foreign exchange rates and foreign exchange restrictions.
PFI Prospectus | Principal LifeTime 2025 Fund | Foreign Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Foreign Securities Risk. The risks of foreign securities include loss of value as a result of: political or economic instability; nationalization, expropriation, or confiscatory taxation; settlement delays; and limited government regulation (including less stringent reporting, accounting, and disclosure standards than are required of U.S. companies).
PFI Prospectus | Principal LifeTime 2025 Fund | Fund Of Funds Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Fund of Funds Risk. Fund shareholders bear indirectly their proportionate share of the expenses of other investment companies (for example, other mutual funds or exchange-traded funds) in which the Fund invests (“underlying funds”). The Fund’s selection and weighting of asset classes and allocation of investments in underlying funds may cause it to underperform other funds with a similar investment objective. The Fund’s performance and risks correspond directly to the performance and risks of the underlying funds in which it invests, proportionately in accordance with the weightings of such investments, and there is no assurance that the underlying funds will achieve their investment objectives. Management of the Fund entails potential conflicts of interest: the Fund invests in affiliated underlying funds; and PGI and its affiliates may earn different fees from different underlying funds and may have an incentive to allocate more Fund assets to underlying funds from which they receive higher fees.
PFI Prospectus | Principal LifeTime 2025 Fund | Portfolio Duration Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Portfolio Duration Risk. Portfolio duration is a measure of the expected life of a fixed-income security and its sensitivity to changes in interest rates. The longer a fund’s average portfolio duration, the more sensitive the fund will be to changes in interest rates, which means funds with longer average portfolio durations may be more volatile than those with shorter durations.
PFI Prospectus | Principal LifeTime 2025 Fund | Redemption And Large Transaction Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Redemption and Large Transaction Risk. Ownership of the Fund’s shares may be concentrated in one or a few large investors (such as funds of funds, institutional investors, and asset allocation programs) that may redeem or purchase shares in large quantities. These transactions may cause the Fund to sell securities to meet redemptions or to invest additional cash at times it would not otherwise do so, which may result in increased transaction costs, increased expenses, changes to expense ratios, and adverse effects to Fund performance. Such transactions may also accelerate the realization of taxable income if sales of portfolio securities result in gains. Moreover, reallocations by large shareholders among share classes of a fund may result in changes to the expense ratios of affected classes, which may increase the expenses paid by shareholders of the class that experienced the redemption.
PFI Prospectus | Principal LifeTime 2025 Fund | Securitized Products Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Securitized Products Risk. Investments in securitized products are subject to risks similar to traditional fixed-income securities, such as credit, interest rate, liquidity, prepayment, extension, and default risk, as well as additional risks associated with the nature of the assets and the servicing of those assets. Unscheduled prepayments on securitized products may have to be reinvested at lower rates. A reduction in prepayments may increase the effective maturities of these securities, exposing them to the risk of decline in market value over time (extension risk).
PFI Prospectus | Principal LifeTime 2025 Fund | Target Date Fund Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Target Date Fund Risk. A target date fund should not be selected based solely on age or retirement date because there is no guarantee that this Fund will provide adequate income at or through retirement.
PFI Prospectus | Principal LifeTime 2025 Fund | U.S. Government Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
U.S. Government Securities Risk. Yields available from U.S. government securities are generally lower than yields from many other fixed-income securities. The value of U.S. government securities may be adversely impacted by changes in interest rates, changes in the credit rating of the U.S. government, or a default by the U.S. government.
PFI Prospectus | Principal LifeTime 2025 Fund | U.S. Government-Sponsored Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
U.S. Government-Sponsored Securities Risk. Securities issued by U.S. government-sponsored enterprises such as the Federal Home Loan Mortgage Corporation, the Federal National Mortgage Association, and the Federal Home Loan Banks are not issued or guaranteed by the U.S. government.
PFI Prospectus | Principal LifeTime 2025 Fund | Bloomberg U.S. Aggregate Bond Index (reflects no deduction for fees, expenses, or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
Label rr_AverageAnnualReturnLabel Bloomberg U.S. Aggregate Bond Index (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 5.53%
5 Years rr_AverageAnnualReturnYear05 1.10%
10 Years rr_AverageAnnualReturnYear10 1.81%
PFI Prospectus | Principal LifeTime 2025 Fund | S&P Target Date 2025 Index (reflects no deduction for fees, expenses, or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
Label rr_AverageAnnualReturnLabel S&P Target Date 2025 Index (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 12.99%
5 Years rr_AverageAnnualReturnYear05 7.42%
10 Years rr_AverageAnnualReturnYear10 5.85%
PFI Prospectus | Principal LifeTime 2025 Fund | Institutional Class  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol LTSTX
Shareholder Fee, Other rr_ShareholderFeeOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.01%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.55%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.56%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 57
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 179
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 313
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 701
Annual Return 2014 rr_AnnualReturn2014 5.87%
Annual Return 2015 rr_AnnualReturn2015 (1.17%)
Annual Return 2016 rr_AnnualReturn2016 6.02%
Annual Return 2017 rr_AnnualReturn2017 16.76%
Annual Return 2018 rr_AnnualReturn2018 (6.40%)
Annual Return 2019 rr_AnnualReturn2019 20.48%
Annual Return 2020 rr_AnnualReturn2020 13.70%
Annual Return 2021 rr_AnnualReturn2021 10.94%
Annual Return 2022 rr_AnnualReturn2022 (15.22%)
Annual Return 2023 rr_AnnualReturn2023 13.31%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Highest return for a quarter during the period of the bar chart above:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 14.07%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Lowest return for a quarter during the period of the bar chart above:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (13.80%)
Label rr_AverageAnnualReturnLabel Institutional Class Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 13.31%
5 Years rr_AverageAnnualReturnYear05 7.86%
10 Years rr_AverageAnnualReturnYear10 5.87%
PFI Prospectus | Principal LifeTime 2025 Fund | Institutional Class | After Taxes on Distributions  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Institutional Class Return After Taxes on Distributions
1 Year rr_AverageAnnualReturnYear01 11.84%
5 Years rr_AverageAnnualReturnYear05 5.98%
10 Years rr_AverageAnnualReturnYear10 4.11%
PFI Prospectus | Principal LifeTime 2025 Fund | Institutional Class | After Taxes on Distributions and Sales  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Institutional Class Return After Taxes on Distributions and Sale of Fund Shares
1 Year rr_AverageAnnualReturnYear01 8.31%
5 Years rr_AverageAnnualReturnYear05 5.78%
10 Years rr_AverageAnnualReturnYear10 4.19%
PFI Prospectus | Principal LifeTime 2025 Fund | Class R-1  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol LTSNX
Shareholder Fee, Other rr_ShareholderFeeOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.35%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.54%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.55%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.44%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 147
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 456
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 787
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,724
Label rr_AverageAnnualReturnLabel Class R-1 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 12.48%
5 Years rr_AverageAnnualReturnYear05 6.92%
10 Years rr_AverageAnnualReturnYear10 4.95%
PFI Prospectus | Principal LifeTime 2025 Fund | Class R-3  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol LTVPX
Shareholder Fee, Other rr_ShareholderFeeOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.33%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.55%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.13%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 115
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 359
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 622
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,375
Label rr_AverageAnnualReturnLabel Class R-3 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 12.73%
5 Years rr_AverageAnnualReturnYear05 7.24%
10 Years rr_AverageAnnualReturnYear10 5.27%
PFI Prospectus | Principal LifeTime 2025 Fund | Class R-4  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol LTEEX
Shareholder Fee, Other rr_ShareholderFeeOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.10%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.29%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.55%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.94%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 96
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 300
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 520
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,155
Label rr_AverageAnnualReturnLabel Class R-4 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 13.03%
5 Years rr_AverageAnnualReturnYear05 7.47%
10 Years rr_AverageAnnualReturnYear10 5.48%
PFI Prospectus | Principal LifeTime 2025 Fund | Class R-5  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol LTPDX
Shareholder Fee, Other rr_ShareholderFeeOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.27%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.55%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.82%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 84
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 262
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 455
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,014
Label rr_AverageAnnualReturnLabel Class R-5 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 13.15%
5 Years rr_AverageAnnualReturnYear05 7.59%
10 Years rr_AverageAnnualReturnYear10 5.60%
PFI Prospectus | Principal LifeTime 2030 Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading PRINCIPAL LIFETIME 2030 FUND
Objective [Heading] rr_ObjectiveHeading Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The Fund seeks a total return consisting of long-term growth of capital and current income.
Expense [Heading] rr_ExpenseHeading Fees and Expenses of the Fund
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock
This table describes the fees and expenses that you may pay if you buy, hold, and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $100,000 in Class A Shares of Principal Funds, Inc. More information about these and other discounts is available from your financial intermediary and in “Choosing a Share Class and The Costs of Investing” beginning on page 426 of the Fund’s Prospectus, Appendix B to the Prospectus titled “Intermediary-Specific Sales Charge Waivers and Reductions,” and “Multiple Class Structure” beginning on page 70 of the Fund’s Statement of Additional Information.
If you purchase Institutional Class shares through certain programs offered by certain financial intermediaries, you may be required to pay a commission and/or other forms of compensation to the broker, or to your Financial Professional or other financial intermediary.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder Fees (fees paid directly from your investment)
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock
The Fund and each underlying fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs. These costs, which are not reflected in Annual Fund Operating Expenses or in the Example, affect the Fund’s and the underlying fund's performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 11.2% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 11.20%
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, No Redemption, By Year, Caption [Text] rr_ExpenseExampleNoRedemptionByYearCaption With respect to Class J shares, you would pay the following expenses if you did not redeem your shares (all other classes would be the same as in the above example):
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
The Fund operates as a “target date fund” that invests according to an asset allocation strategy designed for investors having a retirement investment goal close to the year in the Fund’s name. The Fund is a fund of funds and invests in underlying funds of Principal Funds, Inc. (“PFI”). Its underlying funds consist of domestic and foreign equity funds, fixed-income funds, real asset funds, and other funds that aim to offer diversification beyond traditional equity and fixed-income securities. The asset class diversification of the Fund is designed to moderate overall price volatility. The Fund may add, remove, or substitute underlying funds at any time.
The Fund is managed with strategic or long-term asset class targets and target ranges. There is a rebalancing strategy that aligns with the target weights to identify asset classes that are either overweight or underweight. The Fund may shift asset class targets in response to normal evaluative processes, the shortening time horizon of the Fund, or changes in market forces or Fund circumstances.
In selecting underlying funds and target weights, the Fund considers both quantitative measures (e.g., past performance, expected levels of risk and returns, expense levels, diversification, and style consistency) and qualitative factors (e.g., organizational stability, investment experience, investment and risk management processes, and information, trading, and compliance systems). There are no minimum or maximum percentages of assets that the Fund must invest in a specific asset class or underlying fund.
The underlying funds invest in growth and value stocks of small, medium, and large market capitalization companies, fixed-income securities, domestic and foreign securities, securities denominated in foreign currencies, investment companies (including index funds), U.S. government and U.S. government-sponsored securities, and derivatives. A derivative is a financial arrangement, the value of which is derived from, or based on, a traditional security, asset, or market index. The underlying funds principally use futures, options, swaps (including, for example, credit default, interest rate, and currency swaps), and forwards in order to gain exposure to a variety of securities or asset classes or attempt to reduce risk.
The Fund’s asset allocation will become more conservative over time as investment goals near (for example, retirement, which is assumed to begin at age 65) and investors become more risk-averse. Approximately 10 years after its target year, the Fund’s underlying fund allocation is expected to match that of the Principal LifeTime Strategic Income Fund. At that time, the Fund may be combined with the Principal LifeTime Strategic Income Fund if the Board of Directors determines that the combination is in the best interests of Fund shareholders. It is expected that at the target date in the Fund’s name, the shareholder will begin gradually withdrawing the account’s value.
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Risk [Heading] rr_RiskHeading Principal Risks
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
The following information provides some indication of the risks of investing in the Fund. Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. You may get updated performance information at www.PrincipalAM.com.
The bar chart shows the investment returns of the Fund’s Class A shares for each full calendar year of operations for 10 years (or, if shorter, the life of the Fund). These annual returns do not reflect sales charges on Class A shares; if they did, results would be lower. The table shows for the last one, five, and ten calendar year periods (or, if shorter, the life of the Fund), how the Fund’s average annual total returns compare with those of one or more broad measures of market performance.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following information provides some indication of the risks of investing in the Fund.
Performance Additional Market Index [Text] rr_PerformanceAdditionalMarketIndex The S&P Target Date 2030 Index is included as an additional index for the Fund as it shows how the Fund’s performance compares with the returns of an index of funds with similar investment objectives.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.PrincipalAM.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.
Bar Chart [Heading] rr_BarChartHeading Total Returns as of December 31
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
Highest return for a quarter during the period of the bar chart above:Q2 202015.42 %
Lowest return for a quarter during the period of the bar chart above:Q1 2020(15.80)%
Performance Table Heading rr_PerformanceTableHeading Average Annual Total ReturnsFor the periods ended December 31, 2023
Performance Table Market Index Changed rr_PerformanceTableMarketIndexChanged Effective March 1, 2024, the Fund changed its primary broad-based index to the S&P 1500 TR in order to meet the revised definition of “broad-based securities market index.”
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are shown for Class A shares only and would be different for the other share classes.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock
After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. After-tax returns are shown for Class A shares only and would be different for the other share classes.
Effective March 1, 2024, the Fund changed its primary broad-based index to the S&P 1500 TR in order to meet the revised definition of “broad-based securities market index.” The S&P Target Date 2030 Index is included as an additional index for the Fund as it shows how the Fund’s performance compares with the returns of an index of funds with similar investment objectives.
PFI Prospectus | Principal LifeTime 2030 Fund | Risk Lose Money [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Many factors affect that value, and it is possible to lose money by investing in the Fund.
PFI Prospectus | Principal LifeTime 2030 Fund | Risk Not Insured Depository Institution [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
PFI Prospectus | Principal LifeTime 2030 Fund | Counterparty Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Counterparty Risk. Counterparty risk is the risk that the counterparty to a contract or other obligation will be unable or unwilling to honor its obligations.
PFI Prospectus | Principal LifeTime 2030 Fund | Derivatives Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Derivatives Risk. Derivatives may not move in the direction anticipated by the portfolio manager. Transactions in derivatives may increase volatility, cause the liquidation of portfolio positions when not advantageous to do so, and result in disproportionate losses that may be substantially greater than a fund’s initial investment.
•Credit Default Swaps. Credit default swaps involve special risks in addition to those associated with swaps generally because they are difficult to value, are highly susceptible to liquidity and credit risk, and generally pay a return to the party that has paid the premium only in the event of an actual default by the issuer of the underlying obligation (as opposed to a credit downgrade or other indication of financial difficulty). The protection “buyer” in a credit default contract may be obligated to pay the protection “seller” an up-front payment or a periodic stream of payments over the term of the contract, provided, generally, that no credit event on a reference obligation has occurred. If a credit event occurs, the seller generally must pay the buyer the “par value” (i.e., full notional value) of the swap in exchange for an equal face amount of deliverable obligations of the reference entity described in the swap, or the seller may be required to deliver the related net cash amount, if the swap is cash settled. The Fund may be either the buyer or seller in the transaction.
•Forward Contracts, Futures, and Swaps. Forward contracts, futures, and swaps involve specific risks, including: the imperfect correlation between the change in market value of the instruments held by the fund and the price of the forward contract, future, or swap; possible lack of a liquid secondary market for a forward contract, future, or swap and the resulting inability to close a forward contract, future, or swap when desired; counterparty risk; and if the fund has insufficient cash, it may have to sell securities from its portfolio to meet daily variation margin requirements.
•Options. Options involve specific risks, including: the imperfect correlation between the change in market value of the instruments held by the Fund and the price of the options; counterparty risk; difference in trading hours for the options markets and the markets for the underlying securities (rate movements can take place in the underlying markets that cannot be reflected in the options markets); and an insufficient liquid secondary market for particular options.
PFI Prospectus | Principal LifeTime 2030 Fund | Derivatives Risk, Credit Default Swaps Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Credit Default Swaps. Credit default swaps involve special risks in addition to those associated with swaps generally because they are difficult to value, are highly susceptible to liquidity and credit risk, and generally pay a return to the party that has paid the premium only in the event of an actual default by the issuer of the underlying obligation (as opposed to a credit downgrade or other indication of financial difficulty). The protection “buyer” in a credit default contract may be obligated to pay the protection “seller” an up-front payment or a periodic stream of payments over the term of the contract, provided, generally, that no credit event on a reference obligation has occurred. If a credit event occurs, the seller generally must pay the buyer the “par value” (i.e., full notional value) of the swap in exchange for an equal face amount of deliverable obligations of the reference entity described in the swap, or the seller may be required to deliver the related net cash amount, if the swap is cash settled. The Fund may be either the buyer or seller in the transaction.
PFI Prospectus | Principal LifeTime 2030 Fund | Derivatives Risk, Forward Contracts, Futures, And Swaps Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Forward Contracts, Futures, and Swaps. Forward contracts, futures, and swaps involve specific risks, including: the imperfect correlation between the change in market value of the instruments held by the fund and the price of the forward contract, future, or swap; possible lack of a liquid secondary market for a forward contract, future, or swap and the resulting inability to close a forward contract, future, or swap when desired; counterparty risk; and if the fund has insufficient cash, it may have to sell securities from its portfolio to meet daily variation margin requirements.
PFI Prospectus | Principal LifeTime 2030 Fund | Derivatives Risk, Options Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Options. Options involve specific risks, including: the imperfect correlation between the change in market value of the instruments held by the Fund and the price of the options; counterparty risk; difference in trading hours for the options markets and the markets for the underlying securities (rate movements can take place in the underlying markets that cannot be reflected in the options markets); and an insufficient liquid secondary market for particular options.
PFI Prospectus | Principal LifeTime 2030 Fund | Equity Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Equity Securities Risk. A variety of factors can negatively impact the value of equity securities held by a fund, including a decline in the issuer’s financial condition, unfavorable performance of the issuer’s sector or industry, or changes in response to overall market and economic conditions. A fund’s principal market segment(s) (such as market capitalization or style) may underperform other market segments or the equity markets as a whole.
•Growth Style Risk. Growth investing entails the risk that if growth companies do not increase their earnings at a rate expected by investors, the market price of their stock may decline significantly, even if earnings show an absolute increase. Growth company stocks also typically lack the dividend yield that can lessen price declines in market downturns.
•Smaller Companies Risk. Investments in smaller companies may involve greater risk and price volatility than investments in larger, more mature companies. Smaller companies may have limited product lines, markets, or financial resources; lack the competitive strength of larger companies; have less experienced managers; or depend on a few key employees. Their securities often are less widely held and trade less frequently and in lesser quantities, and their market prices often fluctuate more, than securities of larger companies.
•Value Style Risk. Value investing entails the risk that value stocks may continue to be undervalued by the market for extended periods, including the entire period during which the stock is held by a fund, or the events that would cause the stock price to increase may not occur as anticipated or at all. Moreover, a stock that appears to be undervalued actually may be appropriately priced at a low level and, therefore, would not be profitable for the fund.
PFI Prospectus | Principal LifeTime 2030 Fund | Equity Securities Risk, Growth Style Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Growth Style Risk. Growth investing entails the risk that if growth companies do not increase their earnings at a rate expected by investors, the market price of their stock may decline significantly, even if earnings show an absolute increase. Growth company stocks also typically lack the dividend yield that can lessen price declines in market downturns.
PFI Prospectus | Principal LifeTime 2030 Fund | Equity Securities Risk, Smaller Companies Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Smaller Companies Risk. Investments in smaller companies may involve greater risk and price volatility than investments in larger, more mature companies. Smaller companies may have limited product lines, markets, or financial resources; lack the competitive strength of larger companies; have less experienced managers; or depend on a few key employees. Their securities often are less widely held and trade less frequently and in lesser quantities, and their market prices often fluctuate more, than securities of larger companies.
PFI Prospectus | Principal LifeTime 2030 Fund | Equity Securities Risk, Value Style Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Value Style Risk. Value investing entails the risk that value stocks may continue to be undervalued by the market for extended periods, including the entire period during which the stock is held by a fund, or the events that would cause the stock price to increase may not occur as anticipated or at all. Moreover, a stock that appears to be undervalued actually may be appropriately priced at a low level and, therefore, would not be profitable for the fund.
PFI Prospectus | Principal LifeTime 2030 Fund | Fixed-Income Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Fixed-Income Securities Risk. Fixed-income securities are subject to interest rate, credit quality, and liquidity risks. The market value of fixed-income securities generally declines when interest rates rise, and increased interest rates may adversely affect the liquidity of certain fixed-income securities. Moreover, an issuer of fixed-income securities could default on its payment obligations due to increased interest rates or for other reasons.
PFI Prospectus | Principal LifeTime 2030 Fund | Foreign Currency Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Foreign Currency Risk. Risks of investing in securities denominated in, or that trade in, foreign (non-U.S.) currencies include changes in foreign exchange rates and foreign exchange restrictions.
PFI Prospectus | Principal LifeTime 2030 Fund | Foreign Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Foreign Securities Risk. The risks of foreign securities include loss of value as a result of: political or economic instability; nationalization, expropriation, or confiscatory taxation; settlement delays; and limited government regulation (including less stringent reporting, accounting, and disclosure standards than are required of U.S. companies).
PFI Prospectus | Principal LifeTime 2030 Fund | Fund Of Funds Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Fund of Funds Risk. Fund shareholders bear indirectly their proportionate share of the expenses of other investment companies (for example, other mutual funds or exchange-traded funds) in which the Fund invests (“underlying funds”). The Fund’s selection and weighting of asset classes and allocation of investments in underlying funds may cause it to underperform other funds with a similar investment objective. The Fund’s performance and risks correspond directly to the performance and risks of the underlying funds in which it invests, proportionately in accordance with the weightings of such investments, and there is no assurance that the underlying funds will achieve their investment objectives. Management of the Fund entails potential conflicts of interest: the Fund invests in affiliated underlying funds; and PGI and its affiliates may earn different fees from different underlying funds and may have an incentive to allocate more Fund assets to underlying funds from which they receive higher fees.
PFI Prospectus | Principal LifeTime 2030 Fund | Index Fund Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Index Fund Risk. Index funds use a passive investment approach and generally do not attempt to manage market volatility, use defensive strategies, or reduce the effect of any long-term periods of poor investment performance. Therefore, the Fund may hold securities that present risks that an investment advisor researching individual securities might seek to avoid. An index fund has operating and other expenses while an index does not. As a result, over time, index funds tend to underperform the index. The correlation between fund performance and index performance may also be affected by the type of passive investment approach used by a fund (sampling or replication), changes in securities markets, changes in the composition of the index, and the timing of purchases and sales of fund shares. Errors or delays in compiling or rebalancing the Index may impact the performance of the Fund and increase transaction costs.
PFI Prospectus | Principal LifeTime 2030 Fund | Portfolio Duration Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Portfolio Duration Risk. Portfolio duration is a measure of the expected life of a fixed-income security and its sensitivity to changes in interest rates. The longer a fund’s average portfolio duration, the more sensitive the fund will be to changes in interest rates, which means funds with longer average portfolio durations may be more volatile than those with shorter durations.
PFI Prospectus | Principal LifeTime 2030 Fund | Redemption And Large Transaction Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Redemption and Large Transaction Risk. Ownership of the Fund’s shares may be concentrated in one or a few large investors (such as funds of funds, institutional investors, and asset allocation programs) that may redeem or purchase shares in large quantities. These transactions may cause the Fund to sell securities to meet redemptions or to invest additional cash at times it would not otherwise do so, which may result in increased transaction costs, increased expenses, changes to expense ratios, and adverse effects to Fund performance. Such transactions may also accelerate the realization of taxable income if sales of portfolio securities result in gains. Moreover, reallocations by large shareholders among share classes of a fund may result in changes to the expense ratios of affected classes, which may increase the expenses paid by shareholders of the class that experienced the redemption.
PFI Prospectus | Principal LifeTime 2030 Fund | Securitized Products Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Securitized Products Risk. Investments in securitized products are subject to risks similar to traditional fixed-income securities, such as credit, interest rate, liquidity, prepayment, extension, and default risk, as well as additional risks associated with the nature of the assets and the servicing of those assets. Unscheduled prepayments on securitized products may have to be reinvested at lower rates. A reduction in prepayments may increase the effective maturities of these securities, exposing them to the risk of decline in market value over time (extension risk).
PFI Prospectus | Principal LifeTime 2030 Fund | Target Date Fund Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Target Date Fund Risk. A target date fund should not be selected based solely on age or retirement date because there is no guarantee that this Fund will provide adequate income at or through retirement.
PFI Prospectus | Principal LifeTime 2030 Fund | U.S. Government Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
U.S. Government Securities Risk. Yields available from U.S. government securities are generally lower than yields from many other fixed-income securities. The value of U.S. government securities may be adversely impacted by changes in interest rates, changes in the credit rating of the U.S. government, or a default by the U.S. government.
PFI Prospectus | Principal LifeTime 2030 Fund | U.S. Government-Sponsored Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
U.S. Government-Sponsored Securities Risk. Securities issued by U.S. government-sponsored enterprises such as the Federal Home Loan Mortgage Corporation, the Federal National Mortgage Association, and the Federal Home Loan Banks are not issued or guaranteed by the U.S. government.
PFI Prospectus | Principal LifeTime 2030 Fund | S&P 1500 TR (reflects no deduction for fees, expenses, or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
Label rr_AverageAnnualReturnLabel S&P 1500 TR (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 25.47%
5 Years rr_AverageAnnualReturnYear05 15.39%
10 Years rr_AverageAnnualReturnYear10 11.76%
PFI Prospectus | Principal LifeTime 2030 Fund | S&P Target Date 2030 Index (reflects no deduction for fees, expenses, or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
Label rr_AverageAnnualReturnLabel S&P Target Date 2030 Index (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 14.80%
5 Years rr_AverageAnnualReturnYear05 8.42%
10 Years rr_AverageAnnualReturnYear10 6.44%
PFI Prospectus | Principal LifeTime 2030 Fund | Class A  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PTCAX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 3.75%
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.13%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.57%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.95%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 468
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 666
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 881
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,498
Annual Return 2014 rr_AnnualReturn2014 5.52%
Annual Return 2015 rr_AnnualReturn2015 (1.29%)
Annual Return 2016 rr_AnnualReturn2016 5.41%
Annual Return 2017 rr_AnnualReturn2017 18.02%
Annual Return 2018 rr_AnnualReturn2018 (7.76%)
Annual Return 2019 rr_AnnualReturn2019 21.96%
Annual Return 2020 rr_AnnualReturn2020 14.22%
Annual Return 2021 rr_AnnualReturn2021 12.42%
Annual Return 2022 rr_AnnualReturn2022 (17.16%)
Annual Return 2023 rr_AnnualReturn2023 14.75%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Highest return for a quarter during the period of the bar chart above:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 15.42%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Lowest return for a quarter during the period of the bar chart above:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (15.80%)
Label rr_AverageAnnualReturnLabel Class A Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 10.42%
5 Years rr_AverageAnnualReturnYear05 7.47%
10 Years rr_AverageAnnualReturnYear10 5.53%
PFI Prospectus | Principal LifeTime 2030 Fund | Class A | After Taxes on Distributions  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Class A Return After Taxes on Distributions
1 Year rr_AverageAnnualReturnYear01 9.17%
5 Years rr_AverageAnnualReturnYear05 5.59%
10 Years rr_AverageAnnualReturnYear10 3.75%
PFI Prospectus | Principal LifeTime 2030 Fund | Class A | After Taxes on Distributions and Sales  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Class A Return After Taxes on Distributions and Sale of Fund Shares
1 Year rr_AverageAnnualReturnYear01 6.61%
5 Years rr_AverageAnnualReturnYear05 5.55%
10 Years rr_AverageAnnualReturnYear10 3.96%
PFI Prospectus | Principal LifeTime 2030 Fund | Class J  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PLTJX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.15%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.04%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.57%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.76%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 178
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 243
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 422
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 942
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 78
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 243
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 422
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 942
Label rr_AverageAnnualReturnLabel Class J Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 13.94%
5 Years rr_AverageAnnualReturnYear05 8.50%
10 Years rr_AverageAnnualReturnYear10 6.12%
PFI Prospectus | Principal LifeTime 2030 Fund | Institutional Class  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PMTIX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.01%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.57%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.58%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 59
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 186
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 324
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 726
Label rr_AverageAnnualReturnLabel Institutional Class Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 15.13%
5 Years rr_AverageAnnualReturnYear05 8.68%
10 Years rr_AverageAnnualReturnYear10 6.33%
PFI Prospectus | Principal LifeTime 2030 Fund | Class R-1  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PXASX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.35%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.53%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.57%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.45%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 148
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 459
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 792
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,735
Label rr_AverageAnnualReturnLabel Class R-1 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 14.13%
5 Years rr_AverageAnnualReturnYear05 7.73%
10 Years rr_AverageAnnualReturnYear10 5.39%
PFI Prospectus | Principal LifeTime 2030 Fund | Class R-3  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PTCMX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.32%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.57%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.14%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 116
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 362
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 628
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,386
Label rr_AverageAnnualReturnLabel Class R-3 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 14.51%
5 Years rr_AverageAnnualReturnYear05 8.06%
10 Years rr_AverageAnnualReturnYear10 5.73%
PFI Prospectus | Principal LifeTime 2030 Fund | Class R-4  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PTCSX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.10%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.28%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.57%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.95%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 97
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 303
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 525
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,166
Label rr_AverageAnnualReturnLabel Class R-4 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 14.68%
5 Years rr_AverageAnnualReturnYear05 8.27%
10 Years rr_AverageAnnualReturnYear10 5.93%
PFI Prospectus | Principal LifeTime 2030 Fund | Class R-5  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PTCPX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.26%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.57%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.83%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 85
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 265
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 460
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,025
Label rr_AverageAnnualReturnLabel Class R-5 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 14.85%
5 Years rr_AverageAnnualReturnYear05 8.40%
10 Years rr_AverageAnnualReturnYear10 6.05%
PFI Prospectus | Principal LifeTime 2035 Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading PRINCIPAL LIFETIME 2035 FUND
Objective [Heading] rr_ObjectiveHeading Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The Fund seeks a total return consisting of long-term growth of capital and current income.
Expense [Heading] rr_ExpenseHeading Fees and Expenses of the Fund
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock
This table describes the fees and expenses that you may pay if you buy, hold, and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below.
If you purchase Institutional Class shares through certain programs offered by certain financial intermediaries, you may be required to pay a commission and/or other forms of compensation to the broker, or to your Financial Professional or other financial intermediary.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder Fees (fees paid directly from your investment):
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock The Fund and each underlying fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs. These costs, which are not reflected in Annual Fund Operating Expenses or in the Example, affect the Fund’s and the underlying fund's performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 12.3% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 12.30%
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
The Fund operates as a “target date fund” that invests according to an asset allocation strategy designed for investors having a retirement investment goal close to the year in the Fund’s name. The Fund is a fund of funds and invests in underlying funds of Principal Funds, Inc. (“PFI”). Its underlying funds consist of domestic and foreign equity funds, fixed-income funds, real asset funds, and other funds that aim to offer diversification beyond traditional equity and fixed-income securities. The asset class diversification of the Fund is designed to moderate overall price volatility. The Fund may add, remove, or substitute underlying funds at any time.
The Fund is managed with strategic or long-term asset class targets and target ranges. There is a rebalancing strategy that aligns with the target weights to identify asset classes that are either overweight or underweight. The Fund may shift asset class targets in response to normal evaluative processes, the shortening time horizon of the Fund, or changes in market forces or Fund circumstances.
In selecting underlying funds and target weights, the Fund considers both quantitative measures (e.g., past performance, expected levels of risk and returns, expense levels, diversification, and style consistency) and qualitative factors (e.g., organizational stability, investment experience, investment and risk management processes, and information, trading, and compliance systems). There are no minimum or maximum percentages of assets that the Fund must invest in a specific asset class or underlying fund.
The underlying funds invest in growth and value stocks of small, medium, and large market capitalization companies, fixed-income securities, domestic and foreign securities, securities denominated in foreign currencies, investment companies (including index funds), U.S. government and U.S. government-sponsored securities, and derivatives. A derivative is a financial arrangement, the value of which is derived from, or based on, a traditional security, asset, or market index. The underlying funds principally use futures, options, swaps (including, for example, credit default, interest rate, and currency swaps), and forwards in order to gain exposure to a variety of securities or asset classes or attempt to reduce risk.
The Fund’s asset allocation will become more conservative over time as investment goals near (for example, retirement, which is assumed to begin at age 65) and investors become more risk-averse. Approximately 10 years after its target year, the Fund’s underlying fund allocation is expected to match that of the Principal LifeTime Strategic Income Fund. At that time, the Fund may be combined with the Principal LifeTime Strategic Income Fund if the Board of Directors determines that the combination is in the best interests of Fund shareholders. It is expected that at the target date in the Fund’s name, the shareholder will begin gradually withdrawing the account’s value.
LT Glidepath.jpg
Risk [Heading] rr_RiskHeading Principal Risks
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
The following information provides some indication of the risks of investing in the Fund. Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. You may get updated performance information at www.PrincipalAM.com.
The bar chart shows the investment returns of the Fund’s Institutional Class shares for each full calendar year of operations for 10 years (or, if shorter, the life of the Fund). The table shows for the last one, five, and ten calendar year periods (or, if shorter, the life of the Fund), how the Fund’s average annual total returns compare with those of one or more broad measures of market performance.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following information provides some indication of the risks of investing in the Fund.
Performance Additional Market Index [Text] rr_PerformanceAdditionalMarketIndex The S&P Target Date 2035 Index is included as an additional index for the Fund as it shows how the Fund’s performance compares with the returns of an index of funds with similar investment objectives.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.PrincipalAM.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.
Bar Chart [Heading] rr_BarChartHeading Total Returns as of December 31
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
Highest return for a quarter during the period of the bar chart above:
Q2 202017.13 %
Lowest return for a quarter during the period of the bar chart above:
Q1 2020(17.37)%
Performance Table Heading rr_PerformanceTableHeading Average Annual Total ReturnsFor the periods ended December 31, 2023
Performance Table Market Index Changed rr_PerformanceTableMarketIndexChanged Effective March 1, 2024, the Fund changed its primary broad-based index to the S&P 1500 TR in order to meet the revised definition of “broad-based securities market index.”
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are shown for Institutional Class shares only and would be different for the other share classes.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock
After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. After-tax returns are shown for Institutional Class shares only and would be different for the other share classes.
Effective March 1, 2024, the Fund changed its primary broad-based index to the S&P 1500 TR in order to meet the revised definition of “broad-based securities market index.” The S&P Target Date 2035 Index is included as an additional index for the Fund as it shows how the Fund’s performance compares with the returns of an index of funds with similar investment objectives.
PFI Prospectus | Principal LifeTime 2035 Fund | Risk Lose Money [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Many factors affect that value, and it is possible to lose money by investing in the Fund.
PFI Prospectus | Principal LifeTime 2035 Fund | Risk Not Insured Depository Institution [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
PFI Prospectus | Principal LifeTime 2035 Fund | Counterparty Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Counterparty Risk. Counterparty risk is the risk that the counterparty to a contract or other obligation will be unable or unwilling to honor its obligations.
PFI Prospectus | Principal LifeTime 2035 Fund | Derivatives Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Derivatives Risk. Derivatives may not move in the direction anticipated by the portfolio manager. Transactions in derivatives may increase volatility, cause the liquidation of portfolio positions when not advantageous to do so, and result in disproportionate losses that may be substantially greater than a fund’s initial investment.
•Credit Default Swaps. Credit default swaps involve special risks in addition to those associated with swaps generally because they are difficult to value, are highly susceptible to liquidity and credit risk, and generally pay a return to the party that has paid the premium only in the event of an actual default by the issuer of the underlying obligation (as opposed to a credit downgrade or other indication of financial difficulty). The protection “buyer” in a credit default contract may be obligated to pay the protection “seller” an up-front payment or a periodic stream of payments over the term of the contract, provided, generally, that no credit event on a reference obligation has occurred. If a credit event occurs, the seller generally must pay the buyer the “par value” (i.e., full notional value) of the swap in exchange for an equal face amount of deliverable obligations of the reference entity described in the swap, or the seller may be required to deliver the related net cash amount, if the swap is cash settled. The Fund may be either the buyer or seller in the transaction.
•Forward Contracts, Futures, and Swaps. Forward contracts, futures, and swaps involve specific risks, including: the imperfect correlation between the change in market value of the instruments held by the fund and the price of the forward contract, future, or swap; possible lack of a liquid secondary market for a forward contract, future, or swap and the resulting inability to close a forward contract, future, or swap when desired; counterparty risk; and if the fund has insufficient cash, it may have to sell securities from its portfolio to meet daily variation margin requirements.
•Options. Options involve specific risks, including: the imperfect correlation between the change in market value of the instruments held by the Fund and the price of the options; counterparty risk; difference in trading hours for the options markets and the markets for the underlying securities (rate movements can take place in the underlying markets that cannot be reflected in the options markets); and an insufficient liquid secondary market for particular options.
PFI Prospectus | Principal LifeTime 2035 Fund | Derivatives Risk, Credit Default Swaps Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Credit Default Swaps. Credit default swaps involve special risks in addition to those associated with swaps generally because they are difficult to value, are highly susceptible to liquidity and credit risk, and generally pay a return to the party that has paid the premium only in the event of an actual default by the issuer of the underlying obligation (as opposed to a credit downgrade or other indication of financial difficulty). The protection “buyer” in a credit default contract may be obligated to pay the protection “seller” an up-front payment or a periodic stream of payments over the term of the contract, provided, generally, that no credit event on a reference obligation has occurred. If a credit event occurs, the seller generally must pay the buyer the “par value” (i.e., full notional value) of the swap in exchange for an equal face amount of deliverable obligations of the reference entity described in the swap, or the seller may be required to deliver the related net cash amount, if the swap is cash settled. The Fund may be either the buyer or seller in the transaction.
PFI Prospectus | Principal LifeTime 2035 Fund | Derivatives Risk, Forward Contracts, Futures, And Swaps Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Forward Contracts, Futures, and Swaps. Forward contracts, futures, and swaps involve specific risks, including: the imperfect correlation between the change in market value of the instruments held by the fund and the price of the forward contract, future, or swap; possible lack of a liquid secondary market for a forward contract, future, or swap and the resulting inability to close a forward contract, future, or swap when desired; counterparty risk; and if the fund has insufficient cash, it may have to sell securities from its portfolio to meet daily variation margin requirements.
PFI Prospectus | Principal LifeTime 2035 Fund | Derivatives Risk, Options Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Options. Options involve specific risks, including: the imperfect correlation between the change in market value of the instruments held by the Fund and the price of the options; counterparty risk; difference in trading hours for the options markets and the markets for the underlying securities (rate movements can take place in the underlying markets that cannot be reflected in the options markets); and an insufficient liquid secondary market for particular options.
PFI Prospectus | Principal LifeTime 2035 Fund | Equity Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Equity Securities Risk. A variety of factors can negatively impact the value of equity securities held by a fund, including a decline in the issuer’s financial condition, unfavorable performance of the issuer’s sector or industry, or changes in response to overall market and economic conditions. A fund’s principal market segment(s) (such as market capitalization or style) may underperform other market segments or the equity markets as a whole.
•Growth Style Risk. Growth investing entails the risk that if growth companies do not increase their earnings at a rate expected by investors, the market price of their stock may decline significantly, even if earnings show an absolute increase. Growth company stocks also typically lack the dividend yield that can lessen price declines in market downturns.
•Smaller Companies Risk. Investments in smaller companies may involve greater risk and price volatility than investments in larger, more mature companies. Smaller companies may have limited product lines, markets, or financial resources; lack the competitive strength of larger companies; have less experienced managers; or depend on a few key employees. Their securities often are less widely held and trade less frequently and in lesser quantities, and their market prices often fluctuate more, than securities of larger companies.
•Value Style Risk. Value investing entails the risk that value stocks may continue to be undervalued by the market for extended periods, including the entire period during which the stock is held by a fund, or the events that would cause the stock price to increase may not occur as anticipated or at all. Moreover, a stock that appears to be undervalued actually may be appropriately priced at a low level and, therefore, would not be profitable for the fund.
PFI Prospectus | Principal LifeTime 2035 Fund | Equity Securities Risk, Growth Style Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Growth Style Risk. Growth investing entails the risk that if growth companies do not increase their earnings at a rate expected by investors, the market price of their stock may decline significantly, even if earnings show an absolute increase. Growth company stocks also typically lack the dividend yield that can lessen price declines in market downturns.
PFI Prospectus | Principal LifeTime 2035 Fund | Equity Securities Risk, Smaller Companies Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Smaller Companies Risk. Investments in smaller companies may involve greater risk and price volatility than investments in larger, more mature companies. Smaller companies may have limited product lines, markets, or financial resources; lack the competitive strength of larger companies; have less experienced managers; or depend on a few key employees. Their securities often are less widely held and trade less frequently and in lesser quantities, and their market prices often fluctuate more, than securities of larger companies.
PFI Prospectus | Principal LifeTime 2035 Fund | Equity Securities Risk, Value Style Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Value Style Risk. Value investing entails the risk that value stocks may continue to be undervalued by the market for extended periods, including the entire period during which the stock is held by a fund, or the events that would cause the stock price to increase may not occur as anticipated or at all. Moreover, a stock that appears to be undervalued actually may be appropriately priced at a low level and, therefore, would not be profitable for the fund.
PFI Prospectus | Principal LifeTime 2035 Fund | Fixed-Income Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Fixed-Income Securities Risk. Fixed-income securities are subject to interest rate, credit quality, and liquidity risks. The market value of fixed-income securities generally declines when interest rates rise, and increased interest rates may adversely affect the liquidity of certain fixed-income securities. Moreover, an issuer of fixed-income securities could default on its payment obligations due to increased interest rates or for other reasons.
PFI Prospectus | Principal LifeTime 2035 Fund | Foreign Currency Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Foreign Currency Risk. Risks of investing in securities denominated in, or that trade in, foreign (non-U.S.) currencies include changes in foreign exchange rates and foreign exchange restrictions.
PFI Prospectus | Principal LifeTime 2035 Fund | Foreign Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Foreign Securities Risk. The risks of foreign securities include loss of value as a result of: political or economic instability; nationalization, expropriation, or confiscatory taxation; settlement delays; and limited government regulation (including less stringent reporting, accounting, and disclosure standards than are required of U.S. companies).
PFI Prospectus | Principal LifeTime 2035 Fund | Fund Of Funds Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Fund of Funds Risk. Fund shareholders bear indirectly their proportionate share of the expenses of other investment companies (for example, other mutual funds or exchange-traded funds) in which the Fund invests (“underlying funds”). The Fund’s selection and weighting of asset classes and allocation of investments in underlying funds may cause it to underperform other funds with a similar investment objective. The Fund’s performance and risks correspond directly to the performance and risks of the underlying funds in which it invests, proportionately in accordance with the weightings of such investments, and there is no assurance that the underlying funds will achieve their investment objectives. Management of the Fund entails potential conflicts of interest: the Fund invests in affiliated underlying funds; and PGI and its affiliates may earn different fees from different underlying funds and may have an incentive to allocate more Fund assets to underlying funds from which they receive higher fees.
PFI Prospectus | Principal LifeTime 2035 Fund | Index Fund Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Index Fund Risk. Index funds use a passive investment approach and generally do not attempt to manage market volatility, use defensive strategies, or reduce the effect of any long-term periods of poor investment performance. Therefore, the Fund may hold securities that present risks that an investment advisor researching individual securities might seek to avoid. An index fund has operating and other expenses while an index does not. As a result, over time, index funds tend to underperform the index. The correlation between fund performance and index performance may also be affected by the type of passive investment approach used by a fund (sampling or replication), changes in securities markets, changes in the composition of the index, and the timing of purchases and sales of fund shares. Errors or delays in compiling or rebalancing the Index may impact the performance of the Fund and increase transaction costs.
PFI Prospectus | Principal LifeTime 2035 Fund | Portfolio Duration Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Portfolio Duration Risk. Portfolio duration is a measure of the expected life of a fixed-income security and its sensitivity to changes in interest rates. The longer a fund’s average portfolio duration, the more sensitive the fund will be to changes in interest rates, which means funds with longer average portfolio durations may be more volatile than those with shorter durations.
PFI Prospectus | Principal LifeTime 2035 Fund | Redemption And Large Transaction Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Redemption and Large Transaction Risk. Ownership of the Fund’s shares may be concentrated in one or a few large investors (such as funds of funds, institutional investors, and asset allocation programs) that may redeem or purchase shares in large quantities. These transactions may cause the Fund to sell securities to meet redemptions or to invest additional cash at times it would not otherwise do so, which may result in increased transaction costs, increased expenses, changes to expense ratios, and adverse effects to Fund performance. Such transactions may also accelerate the realization of taxable income if sales of portfolio securities result in gains. Moreover, reallocations by large shareholders among share classes of a fund may result in changes to the expense ratios of affected classes, which may increase the expenses paid by shareholders of the class that experienced the redemption.
PFI Prospectus | Principal LifeTime 2035 Fund | Securitized Products Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Securitized Products Risk. Investments in securitized products are subject to risks similar to traditional fixed-income securities, such as credit, interest rate, liquidity, prepayment, extension, and default risk, as well as additional risks associated with the nature of the assets and the servicing of those assets. Unscheduled prepayments on securitized products may have to be reinvested at lower rates. A reduction in prepayments may increase the effective maturities of these securities, exposing them to the risk of decline in market value over time (extension risk).
PFI Prospectus | Principal LifeTime 2035 Fund | Target Date Fund Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Target Date Fund Risk. A target date fund should not be selected based solely on age or retirement date because there is no guarantee that this Fund will provide adequate income at or through retirement.
PFI Prospectus | Principal LifeTime 2035 Fund | U.S. Government Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
U.S. Government Securities Risk. Yields available from U.S. government securities are generally lower than yields from many other fixed-income securities. The value of U.S. government securities may be adversely impacted by changes in interest rates, changes in the credit rating of the U.S. government, or a default by the U.S. government.
PFI Prospectus | Principal LifeTime 2035 Fund | U.S. Government-Sponsored Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
U.S. Government-Sponsored Securities Risk. Securities issued by U.S. government-sponsored enterprises such as the Federal Home Loan Mortgage Corporation, the Federal National Mortgage Association, and the Federal Home Loan Banks are not issued or guaranteed by the U.S. government.
PFI Prospectus | Principal LifeTime 2035 Fund | S&P 1500 TR (reflects no deduction for fees, expenses, or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
Label rr_AverageAnnualReturnLabel S&P 1500 TR (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 25.47%
5 Years rr_AverageAnnualReturnYear05 15.39%
10 Years rr_AverageAnnualReturnYear10 11.76%
PFI Prospectus | Principal LifeTime 2035 Fund | S&P Target Date 2035 Index (reflects no deduction for fees, expenses, or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
Label rr_AverageAnnualReturnLabel S&P Target Date 2035 Index (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 16.63%
5 Years rr_AverageAnnualReturnYear05 9.44%
10 Years rr_AverageAnnualReturnYear10 7.04%
PFI Prospectus | Principal LifeTime 2035 Fund | Institutional Class  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol LTIUX
Shareholder Fee, Other rr_ShareholderFeeOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.01%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.59%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.60%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 61
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 192
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 335
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 750
Annual Return 2014 rr_AnnualReturn2014 6.15%
Annual Return 2015 rr_AnnualReturn2015 (0.79%)
Annual Return 2016 rr_AnnualReturn2016 5.33%
Annual Return 2017 rr_AnnualReturn2017 19.70%
Annual Return 2018 rr_AnnualReturn2018 (7.34%)
Annual Return 2019 rr_AnnualReturn2019 23.47%
Annual Return 2020 rr_AnnualReturn2020 15.70%
Annual Return 2021 rr_AnnualReturn2021 14.11%
Annual Return 2022 rr_AnnualReturn2022 (17.47%)
Annual Return 2023 rr_AnnualReturn2023 16.53%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Highest return for a quarter during the period of the bar chart above:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 17.13%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Lowest return for a quarter during the period of the bar chart above:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (17.37%)
Label rr_AverageAnnualReturnLabel Institutional Class Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 16.53%
5 Years rr_AverageAnnualReturnYear05 9.41%
10 Years rr_AverageAnnualReturnYear10 6.79%
PFI Prospectus | Principal LifeTime 2035 Fund | Institutional Class | After Taxes on Distributions  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Institutional Class Return After Taxes on Distributions
1 Year rr_AverageAnnualReturnYear01 15.16%
5 Years rr_AverageAnnualReturnYear05 7.62%
10 Years rr_AverageAnnualReturnYear10 5.09%
PFI Prospectus | Principal LifeTime 2035 Fund | Institutional Class | After Taxes on Distributions and Sales  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Institutional Class Return After Taxes on Distributions and Sale of Fund Shares
1 Year rr_AverageAnnualReturnYear01 10.34%
5 Years rr_AverageAnnualReturnYear05 7.09%
10 Years rr_AverageAnnualReturnYear10 4.98%
PFI Prospectus | Principal LifeTime 2035 Fund | Class R-1  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol LTANX
Shareholder Fee, Other rr_ShareholderFeeOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.35%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.54%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.59%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.48%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 151
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 468
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 808
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,768
Label rr_AverageAnnualReturnLabel Class R-1 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 15.58%
5 Years rr_AverageAnnualReturnYear05 8.46%
10 Years rr_AverageAnnualReturnYear10 5.86%
PFI Prospectus | Principal LifeTime 2035 Fund | Class R-3  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol LTAOX
Shareholder Fee, Other rr_ShareholderFeeOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.33%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.59%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.17%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 119
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 372
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 644
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,420
Label rr_AverageAnnualReturnLabel Class R-3 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 15.88%
5 Years rr_AverageAnnualReturnYear05 8.80%
10 Years rr_AverageAnnualReturnYear10 6.19%
PFI Prospectus | Principal LifeTime 2035 Fund | Class R-4  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol LTSEX
Shareholder Fee, Other rr_ShareholderFeeOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.10%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.29%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.59%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.98%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 100
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 312
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 542
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,201
Label rr_AverageAnnualReturnLabel Class R-4 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 16.21%
5 Years rr_AverageAnnualReturnYear05 9.02%
10 Years rr_AverageAnnualReturnYear10 6.39%
PFI Prospectus | Principal LifeTime 2035 Fund | Class R-5  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol LTPEX
Shareholder Fee, Other rr_ShareholderFeeOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.27%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.59%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.86%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 88
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 274
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 477
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,061
Label rr_AverageAnnualReturnLabel Class R-5 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 16.27%
5 Years rr_AverageAnnualReturnYear05 9.14%
10 Years rr_AverageAnnualReturnYear10 6.52%
PFI Prospectus | Principal LifeTime 2040 Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading PRINCIPAL LIFETIME 2040 FUND
Objective [Heading] rr_ObjectiveHeading Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The Fund seeks a total return consisting of long-term growth of capital and current income.
Expense [Heading] rr_ExpenseHeading Fees and Expenses of the Fund
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock
This table describes the fees and expenses that you may pay if you buy, hold, and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in Class A Shares of Principal Funds, Inc. More information about these and other discounts is available from your financial intermediary and in “Choosing a Share Class and The Costs of Investing” beginning on page 426 of the Fund’s Prospectus, Appendix B to the Prospectus titled “Intermediary-Specific Sales Charge Waivers and Reductions,” and “Multiple Class Structure” beginning on page 70 of the Fund’s Statement of Additional Information.
If you purchase Institutional Class shares through certain programs offered by certain financial intermediaries, you may be required to pay a commission and/or other forms of compensation to the broker, or to your Financial Professional or other financial intermediary.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder Fees (fees paid directly from your investment)
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination February 28, 2025
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock The Fund and each underlying fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs. These costs, which are not reflected in Annual Fund Operating Expenses or in the Example, affect the Fund’s and the underlying fund's performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 12.4% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 12.40%
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. The calculation of costs takes into account any applicable contractual fee waivers and/or expense reimbursements for the period noted in the table above. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, No Redemption, By Year, Caption [Text] rr_ExpenseExampleNoRedemptionByYearCaption With respect to Class J shares, you would pay the following expenses if you did not redeem your shares (all other classes would be the same as in the above example):
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
The Fund operates as a “target date fund” that invests according to an asset allocation strategy designed for investors having a retirement investment goal close to the year in the Fund’s name. The Fund is a fund of funds and invests in underlying funds of Principal Funds, Inc. (“PFI”). Its underlying funds consist of domestic and foreign equity funds, fixed-income funds, real asset funds, and other funds that aim to offer diversification beyond traditional equity and fixed-income securities. The asset class diversification of the Fund is designed to moderate overall price volatility. The Fund may add, remove, or substitute underlying funds at any time.
The Fund is managed with strategic or long-term asset class targets and target ranges. There is a rebalancing strategy that aligns with the target weights to identify asset classes that are either overweight or underweight. The Fund may shift asset class targets in response to normal evaluative processes, the shortening time horizon of the Fund, or changes in market forces or Fund circumstances.
In selecting underlying funds and target weights, the Fund considers both quantitative measures (e.g., past performance, expected levels of risk and returns, expense levels, diversification, and style consistency) and qualitative factors (e.g., organizational stability, investment experience, investment and risk management processes, and information, trading, and compliance systems). There are no minimum or maximum percentages of assets that the Fund must invest in a specific asset class or underlying fund.
The underlying funds invest in growth and value stocks of small, medium, and large market capitalization companies, fixed-income securities, domestic and foreign (including those in emerging markets) securities, securities denominated in foreign currencies, investment companies (including index funds), U.S. government and U.S. government-sponsored securities, and derivatives. A derivative is a financial arrangement, the value of which is derived from, or based on, a traditional security, asset, or market index. The underlying funds principally use equity index futures and options in order to gain exposure to a variety of securities or asset classes or attempt to reduce risk.
The Fund’s asset allocation will become more conservative over time as investment goals near (for example, retirement, which is assumed to begin at age 65) and investors become more risk-averse. Approximately 10 years after its target year, the Fund’s underlying fund allocation is expected to match that of the Principal LifeTime Strategic Income Fund. At that time, the Fund may be combined with the Principal LifeTime Strategic Income Fund if the Board of Directors determines that the combination is in the best interests of Fund shareholders. It is expected that at the target date in the Fund’s name, the shareholder will begin gradually withdrawing the account’s value.
LT Glidepath.jpg
Risk [Heading] rr_RiskHeading Principal Risks
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
The following information provides some indication of the risks of investing in the Fund. Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. You may get updated performance information at www.PrincipalAM.com.
The bar chart shows the investment returns of the Fund’s Class A shares for each full calendar year of operations for 10 years (or, if shorter, the life of the Fund). These annual returns do not reflect sales charges on Class A shares; if they did, results would be lower. The table shows for the last one, five, and ten calendar year periods (or, if shorter, the life of the Fund), how the Fund’s average annual total returns compare with those of one or more broad measures of market performance.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following information provides some indication of the risks of investing in the Fund.
Performance Additional Market Index [Text] rr_PerformanceAdditionalMarketIndex Effective March 1, 2024, the Fund changed its primary broad-based index to the S&P 1500 TR in order to meet the revised definition of “broad-based securities market index.” The S&P Target Date 2040 Index is included as an additional index for the Fund as it shows how the Fund’s performance compares with the returns of an index of funds with similar investment objectives.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.PrincipalAM.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.
Bar Chart [Heading] rr_BarChartHeading Total Returns as of December 31
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
Highest return for a quarter during the period of the bar chart above:Q2 202017.96 %
Lowest return for a quarter during the period of the bar chart above:Q1 2020(18.87)%
Performance Table Heading rr_PerformanceTableHeading Average Annual Total ReturnsFor the periods ended December 31, 2023
Performance Table Market Index Changed rr_PerformanceTableMarketIndexChanged Effective March 1, 2024, the Fund changed its primary broad-based index to the S&P 1500 TR in order to meet the revised definition of “broad-based securities market index.”
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are shown for Class A shares only and would be different for the other share classes.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock
After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. After-tax returns are shown for Class A shares only and would be different for the other share classes.
Effective March 1, 2024, the Fund changed its primary broad-based index to the S&P 1500 TR in order to meet the revised definition of “broad-based securities market index.” The S&P Target Date 2040 Index is included as an additional index for the Fund as it shows how the Fund’s performance compares with the returns of an index of funds with similar investment objectives.
PFI Prospectus | Principal LifeTime 2040 Fund | Risk Lose Money [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Many factors affect that value, and it is possible to lose money by investing in the Fund.
PFI Prospectus | Principal LifeTime 2040 Fund | Risk Not Insured Depository Institution [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
PFI Prospectus | Principal LifeTime 2040 Fund | Counterparty Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Counterparty Risk. Counterparty risk is the risk that the counterparty to a contract or other obligation will be unable or unwilling to honor its obligations.
PFI Prospectus | Principal LifeTime 2040 Fund | Derivatives Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Derivatives Risk. Derivatives may not move in the direction anticipated by the portfolio manager. Transactions in derivatives may increase volatility, cause the liquidation of portfolio positions when not advantageous to do so, and result in disproportionate losses that may be substantially greater than a fund’s initial investment.
•Futures. Futures contracts involve specific risks, including: the imperfect correlation between the change in market value of the instruments held by the Fund and the price of the futures contract; possible lack of a liquid secondary market for a futures contract and the resulting inability to close a futures contract when desired; counterparty risk; and if the Fund has insufficient cash, it may have to sell securities from its portfolio to meet daily variation margin requirements.
•Options. Options involve specific risks, including: the imperfect correlation between the change in market value of the instruments held by the Fund and the price of the options; counterparty risk; difference in trading hours for the options markets and the markets for the underlying securities (rate movements can take place in the underlying markets that cannot be reflected in the options markets); and an insufficient liquid secondary market for particular options.
PFI Prospectus | Principal LifeTime 2040 Fund | Derivatives Risk, Futures Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Futures. Futures contracts involve specific risks, including: the imperfect correlation between the change in market value of the instruments held by the Fund and the price of the futures contract; possible lack of a liquid secondary market for a futures contract and the resulting inability to close a futures contract when desired; counterparty risk; and if the Fund has insufficient cash, it may have to sell securities from its portfolio to meet daily variation margin requirements.
PFI Prospectus | Principal LifeTime 2040 Fund | Derivatives Risk, Options Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Options. Options involve specific risks, including: the imperfect correlation between the change in market value of the instruments held by the Fund and the price of the options; counterparty risk; difference in trading hours for the options markets and the markets for the underlying securities (rate movements can take place in the underlying markets that cannot be reflected in the options markets); and an insufficient liquid secondary market for particular options.
PFI Prospectus | Principal LifeTime 2040 Fund | Emerging Markets Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Emerging Markets Risk. Investments in emerging markets may have more risk than those in developed markets because the emerging markets are less developed and more illiquid. Emerging markets can also be subject to increased social, economic, regulatory, and political uncertainties and can be extremely volatile. The U.S. Securities and Exchange Commission, the U.S. Department of Justice, and other U.S. authorities may be limited in their ability to pursue bad actors in emerging markets, including with respect to fraud.
PFI Prospectus | Principal LifeTime 2040 Fund | Equity Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Equity Securities Risk. A variety of factors can negatively impact the value of equity securities held by a fund, including a decline in the issuer’s financial condition, unfavorable performance of the issuer’s sector or industry, or changes in response to overall market and economic conditions. A fund’s principal market segment(s) (such as market capitalization or style) may underperform other market segments or the equity markets as a whole.
•Growth Style Risk. Growth investing entails the risk that if growth companies do not increase their earnings at a rate expected by investors, the market price of their stock may decline significantly, even if earnings show an absolute increase. Growth company stocks also typically lack the dividend yield that can lessen price declines in market downturns.
•Smaller Companies Risk. Investments in smaller companies may involve greater risk and price volatility than investments in larger, more mature companies. Smaller companies may have limited product lines, markets, or financial resources; lack the competitive strength of larger companies; have less experienced managers; or depend on a few key employees. Their securities often are less widely held and trade less frequently and in lesser quantities, and their market prices often fluctuate more, than securities of larger companies.
•Value Style Risk. Value investing entails the risk that value stocks may continue to be undervalued by the market for extended periods, including the entire period during which the stock is held by a fund, or the events that would cause the stock price to increase may not occur as anticipated or at all. Moreover, a stock that appears to be undervalued actually may be appropriately priced at a low level and, therefore, would not be profitable for the fund.
PFI Prospectus | Principal LifeTime 2040 Fund | Equity Securities Risk, Growth Style Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Growth Style Risk. Growth investing entails the risk that if growth companies do not increase their earnings at a rate expected by investors, the market price of their stock may decline significantly, even if earnings show an absolute increase. Growth company stocks also typically lack the dividend yield that can lessen price declines in market downturns.
PFI Prospectus | Principal LifeTime 2040 Fund | Equity Securities Risk, Smaller Companies Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Smaller Companies Risk. Investments in smaller companies may involve greater risk and price volatility than investments in larger, more mature companies. Smaller companies may have limited product lines, markets, or financial resources; lack the competitive strength of larger companies; have less experienced managers; or depend on a few key employees. Their securities often are less widely held and trade less frequently and in lesser quantities, and their market prices often fluctuate more, than securities of larger companies.
PFI Prospectus | Principal LifeTime 2040 Fund | Equity Securities Risk, Value Style Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Value Style Risk. Value investing entails the risk that value stocks may continue to be undervalued by the market for extended periods, including the entire period during which the stock is held by a fund, or the events that would cause the stock price to increase may not occur as anticipated or at all. Moreover, a stock that appears to be undervalued actually may be appropriately priced at a low level and, therefore, would not be profitable for the fund.
PFI Prospectus | Principal LifeTime 2040 Fund | Fixed-Income Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Fixed-Income Securities Risk. Fixed-income securities are subject to interest rate, credit quality, and liquidity risks. The market value of fixed-income securities generally declines when interest rates rise, and increased interest rates may adversely affect the liquidity of certain fixed-income securities. Moreover, an issuer of fixed-income securities could default on its payment obligations due to increased interest rates or for other reasons.
PFI Prospectus | Principal LifeTime 2040 Fund | Foreign Currency Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Foreign Currency Risk. Risks of investing in securities denominated in, or that trade in, foreign (non-U.S.) currencies include changes in foreign exchange rates and foreign exchange restrictions.
PFI Prospectus | Principal LifeTime 2040 Fund | Fund Of Funds Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Fund of Funds Risk. Fund shareholders bear indirectly their proportionate share of the expenses of other investment companies (for example, other mutual funds or exchange-traded funds) in which the Fund invests (“underlying funds”). The Fund’s selection and weighting of asset classes and allocation of investments in underlying funds may cause it to underperform other funds with a similar investment objective. The Fund’s performance and risks correspond directly to the performance and risks of the underlying funds in which it invests, proportionately in accordance with the weightings of such investments, and there is no assurance that the underlying funds will achieve their investment objectives. Management of the Fund entails potential conflicts of interest: the Fund invests in affiliated underlying funds; and PGI and its affiliates may earn different fees from different underlying funds and may have an incentive to allocate more Fund assets to underlying funds from which they receive higher fees.
PFI Prospectus | Principal LifeTime 2040 Fund | Index Fund Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Index Fund Risk. Index funds use a passive investment approach and generally do not attempt to manage market volatility, use defensive strategies, or reduce the effect of any long-term periods of poor investment performance. Therefore, the Fund may hold securities that present risks that an investment advisor researching individual securities might seek to avoid. An index fund has operating and other expenses while an index does not. As a result, over time, index funds tend to underperform the index. The correlation between fund performance and index performance may also be affected by the type of passive investment approach used by a fund (sampling or replication), changes in securities markets, changes in the composition of the index, and the timing of purchases and sales of fund shares. Errors or delays in compiling or rebalancing the Index may impact the performance of the Fund and increase transaction costs.
PFI Prospectus | Principal LifeTime 2040 Fund | Portfolio Duration Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Portfolio Duration Risk. Portfolio duration is a measure of the expected life of a fixed-income security and its sensitivity to changes in interest rates. The longer a fund’s average portfolio duration, the more sensitive the fund will be to changes in interest rates, which means funds with longer average portfolio durations may be more volatile than those with shorter durations.
PFI Prospectus | Principal LifeTime 2040 Fund | Redemption And Large Transaction Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Redemption and Large Transaction Risk. Ownership of the Fund’s shares may be concentrated in one or a few large investors (such as funds of funds, institutional investors, and asset allocation programs) that may redeem or purchase shares in large quantities. These transactions may cause the Fund to sell securities to meet redemptions or to invest additional cash at times it would not otherwise do so, which may result in increased transaction costs, increased expenses, changes to expense ratios, and adverse effects to Fund performance. Such transactions may also accelerate the realization of taxable income if sales of portfolio securities result in gains. Moreover, reallocations by large shareholders among share classes of a fund may result in changes to the expense ratios of affected classes, which may increase the expenses paid by shareholders of the class that experienced the redemption.
PFI Prospectus | Principal LifeTime 2040 Fund | Securitized Products Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Securitized Products Risk. Investments in securitized products are subject to risks similar to traditional fixed-income securities, such as credit, interest rate, liquidity, prepayment, extension, and default risk, as well as additional risks associated with the nature of the assets and the servicing of those assets. Unscheduled prepayments on securitized products may have to be reinvested at lower rates. A reduction in prepayments may increase the effective maturities of these securities, exposing them to the risk of decline in market value over time (extension risk).
PFI Prospectus | Principal LifeTime 2040 Fund | Target Date Fund Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Target Date Fund Risk. A target date fund should not be selected based solely on age or retirement date because there is no guarantee that this Fund will provide adequate income at or through retirement.
PFI Prospectus | Principal LifeTime 2040 Fund | U.S. Government Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
U.S. Government Securities Risk. Yields available from U.S. government securities are generally lower than yields from many other fixed-income securities. The value of U.S. government securities may be adversely impacted by changes in interest rates, changes in the credit rating of the U.S. government, or a default by the U.S. government.
PFI Prospectus | Principal LifeTime 2040 Fund | U.S. Government-Sponsored Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
U.S. Government-Sponsored Securities Risk. Securities issued by U.S. government-sponsored enterprises such as the Federal Home Loan Mortgage Corporation, the Federal National Mortgage Association, and the Federal Home Loan Banks are not issued or guaranteed by the U.S. government.
PFI Prospectus | Principal LifeTime 2040 Fund | S&P 1500 TR (reflects no deduction for fees, expenses, or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
Label rr_AverageAnnualReturnLabel S&P 1500 TR (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 25.47%
5 Years rr_AverageAnnualReturnYear05 15.39%
10 Years rr_AverageAnnualReturnYear10 11.76%
PFI Prospectus | Principal LifeTime 2040 Fund | S&P Target Date 2040 Index (reflects no deduction for fees, expenses, or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
Label rr_AverageAnnualReturnLabel S&P Target Date 2040 Index (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 18.16%
5 Years rr_AverageAnnualReturnYear05 10.22%
10 Years rr_AverageAnnualReturnYear10 7.49%
PFI Prospectus | Principal LifeTime 2040 Fund | Class A  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PTDAX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 5.50%
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.15%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.62%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.02%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.02%) [36]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.00%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 646
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 855
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,080
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,727
Annual Return 2014 rr_AnnualReturn2014 5.76%
Annual Return 2015 rr_AnnualReturn2015 (1.14%)
Annual Return 2016 rr_AnnualReturn2016 5.03%
Annual Return 2017 rr_AnnualReturn2017 20.25%
Annual Return 2018 rr_AnnualReturn2018 (8.21%)
Annual Return 2019 rr_AnnualReturn2019 24.48%
Annual Return 2020 rr_AnnualReturn2020 15.61%
Annual Return 2021 rr_AnnualReturn2021 14.96%
Annual Return 2022 rr_AnnualReturn2022 (18.42%)
Annual Return 2023 rr_AnnualReturn2023 17.92%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Highest return for a quarter during the period of the bar chart above:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 17.96%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Lowest return for a quarter during the period of the bar chart above:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (18.87%)
Label rr_AverageAnnualReturnLabel Class A Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 11.44%
5 Years rr_AverageAnnualReturnYear05 8.50%
10 Years rr_AverageAnnualReturnYear10 6.19%
PFI Prospectus | Principal LifeTime 2040 Fund | Class A | After Taxes on Distributions  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Class A Return After Taxes on Distributions
1 Year rr_AverageAnnualReturnYear01 10.22%
5 Years rr_AverageAnnualReturnYear05 6.66%
10 Years rr_AverageAnnualReturnYear10 4.44%
PFI Prospectus | Principal LifeTime 2040 Fund | Class A | After Taxes on Distributions and Sales  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Class A Return After Taxes on Distributions and Sale of Fund Shares
1 Year rr_AverageAnnualReturnYear01 7.39%
5 Years rr_AverageAnnualReturnYear05 6.42%
10 Years rr_AverageAnnualReturnYear10 4.52%
PFI Prospectus | Principal LifeTime 2040 Fund | Class J  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PTDJX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.15%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.05%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.62%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.82%
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.82%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 184
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 262
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 455
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,014
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 84
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 262
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 455
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,014
Label rr_AverageAnnualReturnLabel Class J Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 17.10%
5 Years rr_AverageAnnualReturnYear05 9.94%
10 Years rr_AverageAnnualReturnYear10 6.95%
PFI Prospectus | Principal LifeTime 2040 Fund | Institutional Class  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PTDIX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.01%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.62%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.63%
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.63%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 64
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 202
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 351
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 786
Label rr_AverageAnnualReturnLabel Institutional Class Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 18.36%
5 Years rr_AverageAnnualReturnYear05 10.14%
10 Years rr_AverageAnnualReturnYear10 7.18%
PFI Prospectus | Principal LifeTime 2040 Fund | Class R-1  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PYASX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.35%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.53%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.62%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.50%
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.50%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 153
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 474
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 818
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,791
Label rr_AverageAnnualReturnLabel Class R-1 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 17.28%
5 Years rr_AverageAnnualReturnYear05 9.18%
10 Years rr_AverageAnnualReturnYear10 6.24%
PFI Prospectus | Principal LifeTime 2040 Fund | Class R-3  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PTDMX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.32%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.62%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.19%
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.19%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 121
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 378
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 654
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,443
Label rr_AverageAnnualReturnLabel Class R-3 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 17.63%
5 Years rr_AverageAnnualReturnYear05 9.53%
10 Years rr_AverageAnnualReturnYear10 6.58%
PFI Prospectus | Principal LifeTime 2040 Fund | Class R-4  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PTDSX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.10%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.28%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.62%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.00%
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.00%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 102
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 318
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 552
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,225
Label rr_AverageAnnualReturnLabel Class R-4 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 17.83%
5 Years rr_AverageAnnualReturnYear05 9.74%
10 Years rr_AverageAnnualReturnYear10 6.78%
PFI Prospectus | Principal LifeTime 2040 Fund | Class R-5  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PTDPX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.26%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.62%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.88%
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.88%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 90
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 281
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 488
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,084
Label rr_AverageAnnualReturnLabel Class R-5 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 18.04%
5 Years rr_AverageAnnualReturnYear05 9.86%
10 Years rr_AverageAnnualReturnYear10 6.91%
PFI Prospectus | Principal LifeTime 2045 Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading PRINCIPAL LIFETIME 2045 FUND
Objective [Heading] rr_ObjectiveHeading Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The Fund seeks a total return consisting of long-term growth of capital and current income.
Expense [Heading] rr_ExpenseHeading Fees and Expenses of the Fund
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock
This table describes the fees and expenses that you may pay if you buy, hold, and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below.
If you purchase Institutional Class shares through certain programs offered by certain financial intermediaries, you may be required to pay a commission and/or other forms of compensation to the broker, or to your Financial Professional or other financial intermediary.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder Fees (fees paid directly from your investment):
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock The Fund and each underlying fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs. These costs, which are not reflected in Annual Fund Operating Expenses or in the Example, affect the Fund’s and the underlying fund's performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 11.4% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 11.40%
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
The Fund operates as a “target date fund” that invests according to an asset allocation strategy designed for investors having a retirement investment goal close to the year in the Fund’s name. The Fund is a fund of funds and invests in underlying funds of Principal Funds, Inc. (“PFI”). Its underlying funds consist of domestic and foreign equity funds, fixed-income funds, real asset funds, and other funds that aim to offer diversification beyond traditional equity and fixed-income securities. The asset class diversification of the Fund is designed to moderate overall price volatility. The Fund may add, remove, or substitute underlying funds at any time.
The Fund is managed with strategic or long-term asset class targets and target ranges. There is a rebalancing strategy that aligns with the target weights to identify asset classes that are either overweight or underweight. The Fund may shift asset class targets in response to normal evaluative processes, the shortening time horizon of the Fund, or changes in market forces or Fund circumstances.
In selecting underlying funds and target weights, the Fund considers both quantitative measures (e.g., past performance, expected levels of risk and returns, expense levels, diversification, and style consistency) and qualitative factors (e.g., organizational stability, investment experience, investment and risk management processes, and information, trading, and compliance systems). There are no minimum or maximum percentages of assets that the Fund must invest in a specific asset class or underlying fund.
The underlying funds invest in growth and value stocks of small, medium, and large market capitalization companies, fixed-income securities, domestic and foreign (including those in emerging markets) securities, securities denominated in foreign currencies, investment companies (including index funds), and derivatives. A derivative is a financial arrangement, the value of which is derived from, or based on, a traditional security, asset, or market index. The underlying funds principally use equity index futures and options in order to gain exposure to a variety of securities or asset classes or attempt to reduce risk.
The Fund’s asset allocation will become more conservative over time as investment goals near (for example, retirement, which is assumed to begin at age 65) and investors become more risk-averse. Approximately 10 years after its target year, the Fund’s underlying fund allocation is expected to match that of the Principal LifeTime Strategic Income Fund. At that time, the Fund may be combined with the Principal LifeTime Strategic Income Fund if the Board of Directors determines that the combination is in the best interests of Fund shareholders. It is expected that at the target date in the Fund’s name, the shareholder will begin gradually withdrawing the account’s value.
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Risk [Heading] rr_RiskHeading Principal Risks
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
The following information provides some indication of the risks of investing in the Fund. Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. You may get updated performance information at www.PrincipalAM.com.
The bar chart shows the investment returns of the Fund’s Institutional Class shares for each full calendar year of operations for 10 years (or, if shorter, the life of the Fund). The table shows for the last one, five, and ten calendar year periods (or, if shorter, the life of the Fund), how the Fund’s average annual total returns compare with those of one or more broad measures of market performance.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following information provides some indication of the risks of investing in the Fund.
Performance Additional Market Index [Text] rr_PerformanceAdditionalMarketIndex The S&P Target Date 2045 Index is included as an additional index for the Fund as it shows how the Fund’s performance compares with the returns of an index of funds with similar investment objectives.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.PrincipalAM.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.
Bar Chart [Heading] rr_BarChartHeading Total Returns as of December 31
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
Highest return for a quarter during the period of the bar chart above:Q2 202018.90 %
Lowest return for a quarter during the period of the bar chart above:Q1 2020(19.94)%
Performance Table Heading rr_PerformanceTableHeading Average Annual Total ReturnsFor the periods ended December 31, 2023
Performance Table Market Index Changed rr_PerformanceTableMarketIndexChanged Effective March 1, 2024, the Fund changed its primary broad-based index to the S&P 1500 TR in order to meet the revised definition of “broad-based securities market index.”
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are shown for Institutional Class shares only and would be different for the other share classes.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock
After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. After-tax returns are shown for Institutional Class shares only and would be different for the other share classes.
Effective March 1, 2024, the Fund changed its primary broad-based index to the S&P 1500 TR in order to meet the revised definition of “broad-based securities market index.” The S&P Target Date 2045 Index is included as an additional index for the Fund as it shows how the Fund’s performance compares with the returns of an index of funds with similar investment objectives.
PFI Prospectus | Principal LifeTime 2045 Fund | Risk Lose Money [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Many factors affect that value, and it is possible to lose money by investing in the Fund.
PFI Prospectus | Principal LifeTime 2045 Fund | Risk Not Insured Depository Institution [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
PFI Prospectus | Principal LifeTime 2045 Fund | Counterparty Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Counterparty Risk. Counterparty risk is the risk that the counterparty to a contract or other obligation will be unable or unwilling to honor its obligations.
PFI Prospectus | Principal LifeTime 2045 Fund | Derivatives Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Derivatives Risk. Derivatives may not move in the direction anticipated by the portfolio manager. Transactions in derivatives may increase volatility, cause the liquidation of portfolio positions when not advantageous to do so, and result in disproportionate losses that may be substantially greater than a fund’s initial investment.
•Futures. Futures contracts involve specific risks, including: the imperfect correlation between the change in market value of the instruments held by the Fund and the price of the futures contract; possible lack of a liquid secondary market for a futures contract and the resulting inability to close a futures contract when desired; counterparty risk; and if the Fund has insufficient cash, it may have to sell securities from its portfolio to meet daily variation margin requirements.
•Options. Options involve specific risks, including: the imperfect correlation between the change in market value of the instruments held by the Fund and the price of the options; counterparty risk; difference in trading hours for the options markets and the markets for the underlying securities (rate movements can take place in the underlying markets that cannot be reflected in the options markets); and an insufficient liquid secondary market for particular options.
PFI Prospectus | Principal LifeTime 2045 Fund | Derivatives Risk, Futures Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Futures. Futures contracts involve specific risks, including: the imperfect correlation between the change in market value of the instruments held by the Fund and the price of the futures contract; possible lack of a liquid secondary market for a futures contract and the resulting inability to close a futures contract when desired; counterparty risk; and if the Fund has insufficient cash, it may have to sell securities from its portfolio to meet daily variation margin requirements.
PFI Prospectus | Principal LifeTime 2045 Fund | Derivatives Risk, Options Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Options. Options involve specific risks, including: the imperfect correlation between the change in market value of the instruments held by the Fund and the price of the options; counterparty risk; difference in trading hours for the options markets and the markets for the underlying securities (rate movements can take place in the underlying markets that cannot be reflected in the options markets); and an insufficient liquid secondary market for particular options.
PFI Prospectus | Principal LifeTime 2045 Fund | Emerging Markets Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Emerging Markets Risk. Investments in emerging markets may have more risk than those in developed markets because the emerging markets are less developed and more illiquid. Emerging markets can also be subject to increased social, economic, regulatory, and political uncertainties and can be extremely volatile. The U.S. Securities and Exchange Commission, the U.S. Department of Justice, and other U.S. authorities may be limited in their ability to pursue bad actors in emerging markets, including with respect to fraud.
PFI Prospectus | Principal LifeTime 2045 Fund | Equity Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Equity Securities Risk. A variety of factors can negatively impact the value of equity securities held by a fund, including a decline in the issuer’s financial condition, unfavorable performance of the issuer’s sector or industry, or changes in response to overall market and economic conditions. A fund’s principal market segment(s) (such as market capitalization or style) may underperform other market segments or the equity markets as a whole.
•Growth Style Risk. Growth investing entails the risk that if growth companies do not increase their earnings at a rate expected by investors, the market price of their stock may decline significantly, even if earnings show an absolute increase. Growth company stocks also typically lack the dividend yield that can lessen price declines in market downturns.
•Smaller Companies Risk. Investments in smaller companies may involve greater risk and price volatility than investments in larger, more mature companies. Smaller companies may have limited product lines, markets, or financial resources; lack the competitive strength of larger companies; have less experienced managers; or depend on a few key employees. Their securities often are less widely held and trade less frequently and in lesser quantities, and their market prices often fluctuate more, than securities of larger companies.
•Value Style Risk. Value investing entails the risk that value stocks may continue to be undervalued by the market for extended periods, including the entire period during which the stock is held by a fund, or the events that would cause the stock price to increase may not occur as anticipated or at all. Moreover, a stock that appears to be undervalued actually may be appropriately priced at a low level and, therefore, would not be profitable for the fund.
PFI Prospectus | Principal LifeTime 2045 Fund | Equity Securities Risk, Growth Style Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Growth Style Risk. Growth investing entails the risk that if growth companies do not increase their earnings at a rate expected by investors, the market price of their stock may decline significantly, even if earnings show an absolute increase. Growth company stocks also typically lack the dividend yield that can lessen price declines in market downturns.
PFI Prospectus | Principal LifeTime 2045 Fund | Equity Securities Risk, Smaller Companies Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Smaller Companies Risk. Investments in smaller companies may involve greater risk and price volatility than investments in larger, more mature companies. Smaller companies may have limited product lines, markets, or financial resources; lack the competitive strength of larger companies; have less experienced managers; or depend on a few key employees. Their securities often are less widely held and trade less frequently and in lesser quantities, and their market prices often fluctuate more, than securities of larger companies.
PFI Prospectus | Principal LifeTime 2045 Fund | Equity Securities Risk, Value Style Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Value Style Risk. Value investing entails the risk that value stocks may continue to be undervalued by the market for extended periods, including the entire period during which the stock is held by a fund, or the events that would cause the stock price to increase may not occur as anticipated or at all. Moreover, a stock that appears to be undervalued actually may be appropriately priced at a low level and, therefore, would not be profitable for the fund.
PFI Prospectus | Principal LifeTime 2045 Fund | Fixed-Income Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Fixed-Income Securities Risk. Fixed-income securities are subject to interest rate, credit quality, and liquidity risks. The market value of fixed-income securities generally declines when interest rates rise, and increased interest rates may adversely affect the liquidity of certain fixed-income securities. Moreover, an issuer of fixed-income securities could default on its payment obligations due to increased interest rates or for other reasons.
PFI Prospectus | Principal LifeTime 2045 Fund | Foreign Currency Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Foreign Currency Risk. Risks of investing in securities denominated in, or that trade in, foreign (non-U.S.) currencies include changes in foreign exchange rates and foreign exchange restrictions.
PFI Prospectus | Principal LifeTime 2045 Fund | Foreign Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Foreign Securities Risk. The risks of foreign securities include loss of value as a result of: political or economic instability; nationalization, expropriation, or confiscatory taxation; settlement delays; and limited government regulation (including less stringent reporting, accounting, and disclosure standards than are required of U.S. companies).
PFI Prospectus | Principal LifeTime 2045 Fund | Fund Of Funds Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Fund of Funds Risk. Fund shareholders bear indirectly their proportionate share of the expenses of other investment companies (for example, other mutual funds or exchange-traded funds) in which the Fund invests (“underlying funds”). The Fund’s selection and weighting of asset classes and allocation of investments in underlying funds may cause it to underperform other funds with a similar investment objective. The Fund’s performance and risks correspond directly to the performance and risks of the underlying funds in which it invests, proportionately in accordance with the weightings of such investments, and there is no assurance that the underlying funds will achieve their investment objectives. Management of the Fund entails potential conflicts of interest: the Fund invests in affiliated underlying funds; and PGI and its affiliates may earn different fees from different underlying funds and may have an incentive to allocate more Fund assets to underlying funds from which they receive higher fees.
PFI Prospectus | Principal LifeTime 2045 Fund | Index Fund Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Index Fund Risk. Index funds use a passive investment approach and generally do not attempt to manage market volatility, use defensive strategies, or reduce the effect of any long-term periods of poor investment performance. Therefore, the Fund may hold securities that present risks that an investment advisor researching individual securities might seek to avoid. An index fund has operating and other expenses while an index does not. As a result, over time, index funds tend to underperform the index. The correlation between fund performance and index performance may also be affected by the type of passive investment approach used by a fund (sampling or replication), changes in securities markets, changes in the composition of the index, and the timing of purchases and sales of fund shares. Errors or delays in compiling or rebalancing the Index may impact the performance of the Fund and increase transaction costs.
PFI Prospectus | Principal LifeTime 2045 Fund | Portfolio Duration Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Portfolio Duration Risk. Portfolio duration is a measure of the expected life of a fixed-income security and its sensitivity to changes in interest rates. The longer a fund’s average portfolio duration, the more sensitive the fund will be to changes in interest rates, which means funds with longer average portfolio durations may be more volatile than those with shorter durations.
PFI Prospectus | Principal LifeTime 2045 Fund | Redemption And Large Transaction Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Redemption and Large Transaction Risk. Ownership of the Fund’s shares may be concentrated in one or a few large investors (such as funds of funds, institutional investors, and asset allocation programs) that may redeem or purchase shares in large quantities. These transactions may cause the Fund to sell securities to meet redemptions or to invest additional cash at times it would not otherwise do so, which may result in increased transaction costs, increased expenses, changes to expense ratios, and adverse effects to Fund performance. Such transactions may also accelerate the realization of taxable income if sales of portfolio securities result in gains. Moreover, reallocations by large shareholders among share classes of a fund may result in changes to the expense ratios of affected classes, which may increase the expenses paid by shareholders of the class that experienced the redemption.
PFI Prospectus | Principal LifeTime 2045 Fund | Target Date Fund Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Target Date Fund Risk. A target date fund should not be selected based solely on age or retirement date because there is no guarantee that this Fund will provide adequate income at or through retirement.
PFI Prospectus | Principal LifeTime 2045 Fund | S&P 1500 TR (reflects no deduction for fees, expenses, or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
Label rr_AverageAnnualReturnLabel S&P 1500 TR (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 25.47%
5 Years rr_AverageAnnualReturnYear05 15.39%
10 Years rr_AverageAnnualReturnYear10 11.76%
PFI Prospectus | Principal LifeTime 2045 Fund | S&P Target Date 2045 Index (reflects no deduction for fees, expenses, or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
Label rr_AverageAnnualReturnLabel S&P Target Date 2045 Index (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 19.14%
5 Years rr_AverageAnnualReturnYear05 10.68%
10 Years rr_AverageAnnualReturnYear10 7.76%
PFI Prospectus | Principal LifeTime 2045 Fund | Institutional Class  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol LTRIX
Shareholder Fee, Other rr_ShareholderFeeOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.01%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.64%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.65%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 66
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 208
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 362
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 810
Annual Return 2014 rr_AnnualReturn2014 6.35%
Annual Return 2015 rr_AnnualReturn2015 (0.82%)
Annual Return 2016 rr_AnnualReturn2016 5.58%
Annual Return 2017 rr_AnnualReturn2017 21.39%
Annual Return 2018 rr_AnnualReturn2018 (8.31%)
Annual Return 2019 rr_AnnualReturn2019 25.79%
Annual Return 2020 rr_AnnualReturn2020 16.34%
Annual Return 2021 rr_AnnualReturn2021 16.60%
Annual Return 2022 rr_AnnualReturn2022 (18.52%)
Annual Return 2023 rr_AnnualReturn2023 19.44%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Highest return for a quarter during the period of the bar chart above:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 18.90%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Lowest return for a quarter during the period of the bar chart above:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (19.94%)
Label rr_AverageAnnualReturnLabel Institutional Class Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 19.44%
5 Years rr_AverageAnnualReturnYear05 10.68%
10 Years rr_AverageAnnualReturnYear10 7.49%
PFI Prospectus | Principal LifeTime 2045 Fund | Institutional Class | After Taxes on Distributions  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Institutional Class Return After Taxes on Distributions
1 Year rr_AverageAnnualReturnYear01 18.15%
5 Years rr_AverageAnnualReturnYear05 8.95%
10 Years rr_AverageAnnualReturnYear10 5.87%
PFI Prospectus | Principal LifeTime 2045 Fund | Institutional Class | After Taxes on Distributions and Sales  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Institutional Class Return After Taxes on Distributions and Sale of Fund Shares
1 Year rr_AverageAnnualReturnYear01 12.22%
5 Years rr_AverageAnnualReturnYear05 8.18%
10 Years rr_AverageAnnualReturnYear10 5.61%
PFI Prospectus | Principal LifeTime 2045 Fund | Class R-1  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol LTRGX
Shareholder Fee, Other rr_ShareholderFeeOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.35%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.54%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.64%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.53%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 156
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 483
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 834
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,824
Label rr_AverageAnnualReturnLabel Class R-1 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 18.55%
5 Years rr_AverageAnnualReturnYear05 9.73%
10 Years rr_AverageAnnualReturnYear10 6.55%
PFI Prospectus | Principal LifeTime 2045 Fund | Class R-3  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol LTRVX
Shareholder Fee, Other rr_ShareholderFeeOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.33%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.64%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.22%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 124
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 387
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 670
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,477
Label rr_AverageAnnualReturnLabel Class R-3 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 18.87%
5 Years rr_AverageAnnualReturnYear05 10.05%
10 Years rr_AverageAnnualReturnYear10 6.88%
PFI Prospectus | Principal LifeTime 2045 Fund | Class R-4  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol LTRLX
Shareholder Fee, Other rr_ShareholderFeeOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.10%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.29%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.64%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.03%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 105
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 328
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 569
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,259
Label rr_AverageAnnualReturnLabel Class R-4 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 19.08%
5 Years rr_AverageAnnualReturnYear05 10.27%
10 Years rr_AverageAnnualReturnYear10 7.09%
PFI Prospectus | Principal LifeTime 2045 Fund | Class R-5  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol LTRDX
Shareholder Fee, Other rr_ShareholderFeeOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.27%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.64%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.91%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 93
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 290
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 504
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,120
Label rr_AverageAnnualReturnLabel Class R-5 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 19.19%
5 Years rr_AverageAnnualReturnYear05 10.40%
10 Years rr_AverageAnnualReturnYear10 7.21%
PFI Prospectus | Principal LifeTime 2050 Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading PRINCIPAL LIFETIME 2050 FUND
Objective [Heading] rr_ObjectiveHeading Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The Fund seeks a total return consisting of long-term growth of capital and current income.
Expense [Heading] rr_ExpenseHeading Fees and Expenses of the Fund
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock
This table describes the fees and expenses that you may pay if you buy, hold, and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in Class A Shares of Principal Funds, Inc. More information about these and other discounts is available from your financial intermediary and in “Choosing a Share Class and The Costs of Investing” beginning on page 426 of the Fund’s Prospectus, Appendix B to the Prospectus titled “Intermediary-Specific Sales Charge Waivers and Reductions,” and “Multiple Class Structure” beginning on page 70 of the Fund’s Statement of Additional Information.
If you purchase Institutional Class shares through certain programs offered by certain financial intermediaries, you may be required to pay a commission and/or other forms of compensation to the broker, or to your Financial Professional or other financial intermediary.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder Fees (fees paid directly from your investment)
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination February 28, 2025
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock The Fund and each underlying fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs. These costs, which are not reflected in Annual Fund Operating Expenses or in the Example, affect the Fund’s and the underlying fund's performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 10.6% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 10.60%
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. The calculation of costs takes into account any applicable contractual fee waivers and/or expense reimbursements for the period noted in the table above. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, No Redemption, By Year, Caption [Text] rr_ExpenseExampleNoRedemptionByYearCaption With respect to Class J shares, you would pay the following expenses if you did not redeem your shares (all other classes would be the same as in the above example):
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
The Fund operates as a “target date fund” that invests according to an asset allocation strategy designed for investors having a retirement investment goal close to the year in the Fund’s name. The Fund is a fund of funds and invests in underlying funds of Principal Funds, Inc. (“PFI”). Its underlying funds consist of domestic and foreign equity funds, fixed-income funds, real asset funds, and other funds that aim to offer diversification beyond traditional equity and fixed-income securities. The asset class diversification of the Fund is designed to moderate overall price volatility. The Fund may add, remove, or substitute underlying funds at any time.
The Fund is managed with strategic or long-term asset class targets and target ranges. There is a rebalancing strategy that aligns with the target weights to identify asset classes that are either overweight or underweight. The Fund may shift asset class targets in response to normal evaluative processes, the shortening time horizon of the Fund, or changes in market forces or Fund circumstances.
In selecting underlying funds and target weights, the Fund considers both quantitative measures (e.g., past performance, expected levels of risk and returns, expense levels, diversification, and style consistency) and qualitative factors (e.g., organizational stability, investment experience, investment and risk management processes, and information, trading, and compliance systems). There are no minimum or maximum percentages of assets that the Fund must invest in a specific asset class or underlying fund.
The underlying funds invest in growth and value stocks of small, medium, and large market capitalization companies, fixed-income securities, domestic and foreign (including those in emerging markets) securities, securities denominated in foreign currencies, investment companies (including index funds), and derivatives. A derivative is a financial arrangement, the value of which is derived from, or based on, a traditional security, asset, or market index. The underlying funds principally use equity index futures and options in order to gain exposure to a variety of securities or asset classes or attempt to reduce risk.
The Fund’s asset allocation will become more conservative over time as investment goals near (for example, retirement, which is assumed to begin at age 65) and investors become more risk-averse. Approximately 10 years after its target year, the Fund’s underlying fund allocation is expected to match that of the Principal LifeTime Strategic Income Fund. At that time, the Fund may be combined with the Principal LifeTime Strategic Income Fund if the Board of Directors determines that the combination is in the best interests of Fund shareholders. It is expected that at the target date in the Fund’s name, the shareholder will begin gradually withdrawing the account’s value.
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Risk [Heading] rr_RiskHeading Principal Risks
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
The following information provides some indication of the risks of investing in the Fund. Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. You may get updated performance information at www.PrincipalAM.com.
The bar chart shows the investment returns of the Fund’s Class A shares for each full calendar year of operations for 10 years (or, if shorter, the life of the Fund). These annual returns do not reflect sales charges on Class A shares; if they did, results would be lower. The table shows for the last one, five, and ten calendar year periods (or, if shorter, the life of the Fund), how the Fund’s average annual total returns compare with those of one or more broad measures of market performance.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following information provides some indication of the risks of investing in the Fund.
Performance Additional Market Index [Text] rr_PerformanceAdditionalMarketIndex The S&P Target Date 2050 Index is included as an additional index for the Fund as it shows how the Fund’s performance compares with the returns of an index of funds with similar investment objectives.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.PrincipalAM.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.
Bar Chart [Heading] rr_BarChartHeading Total Returns as of December 31
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
Highest return for a quarter during the period of the bar chart above:Q2 202019.45 %
Lowest return for a quarter during the period of the bar chart above:Q1 2020(20.88)%
Performance Table Heading rr_PerformanceTableHeading Average Annual Total ReturnsFor the periods ended December 31, 2023
Performance Table Market Index Changed rr_PerformanceTableMarketIndexChanged Effective March 1, 2024, the Fund changed its primary broad-based index to the S&P 1500 TR in order to meet the revised definition of “broad-based securities market index.”
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are shown for Class A shares only and would be different for the other share classes.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock
After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. After-tax returns are shown for Class A shares only and would be different for the other share classes.
Effective March 1, 2024, the Fund changed its primary broad-based index to the S&P 1500 TR in order to meet the revised definition of “broad-based securities market index.” The S&P Target Date 2050 Index is included as an additional index for the Fund as it shows how the Fund’s performance compares with the returns of an index of funds with similar investment objectives.
PFI Prospectus | Principal LifeTime 2050 Fund | Risk Lose Money [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Many factors affect that value, and it is possible to lose money by investing in the Fund.
PFI Prospectus | Principal LifeTime 2050 Fund | Risk Not Insured Depository Institution [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
PFI Prospectus | Principal LifeTime 2050 Fund | Counterparty Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Counterparty Risk. Counterparty risk is the risk that the counterparty to a contract or other obligation will be unable or unwilling to honor its obligations.
PFI Prospectus | Principal LifeTime 2050 Fund | Derivatives Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Derivatives Risk. Derivatives may not move in the direction anticipated by the portfolio manager. Transactions in derivatives may increase volatility, cause the liquidation of portfolio positions when not advantageous to do so, and result in disproportionate losses that may be substantially greater than a fund’s initial investment.
•Futures. Futures contracts involve specific risks, including: the imperfect correlation between the change in market value of the instruments held by the Fund and the price of the futures contract; possible lack of a liquid secondary market for a futures contract and the resulting inability to close a futures contract when desired; counterparty risk; and if the Fund has insufficient cash, it may have to sell securities from its portfolio to meet daily variation margin requirements.
•Options. Options involve specific risks, including: the imperfect correlation between the change in market value of the instruments held by the Fund and the price of the options; counterparty risk; difference in trading hours for the options markets and the markets for the underlying securities (rate movements can take place in the underlying markets that cannot be reflected in the options markets); and an insufficient liquid secondary market for particular options.
PFI Prospectus | Principal LifeTime 2050 Fund | Derivatives Risk, Futures Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Futures. Futures contracts involve specific risks, including: the imperfect correlation between the change in market value of the instruments held by the Fund and the price of the futures contract; possible lack of a liquid secondary market for a futures contract and the resulting inability to close a futures contract when desired; counterparty risk; and if the Fund has insufficient cash, it may have to sell securities from its portfolio to meet daily variation margin requirements.
PFI Prospectus | Principal LifeTime 2050 Fund | Derivatives Risk, Options Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Options. Options involve specific risks, including: the imperfect correlation between the change in market value of the instruments held by the Fund and the price of the options; counterparty risk; difference in trading hours for the options markets and the markets for the underlying securities (rate movements can take place in the underlying markets that cannot be reflected in the options markets); and an insufficient liquid secondary market for particular options.
PFI Prospectus | Principal LifeTime 2050 Fund | Emerging Markets Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Emerging Markets Risk. Investments in emerging markets may have more risk than those in developed markets because the emerging markets are less developed and more illiquid. Emerging markets can also be subject to increased social, economic, regulatory, and political uncertainties and can be extremely volatile. The U.S. Securities and Exchange Commission, the U.S. Department of Justice, and other U.S. authorities may be limited in their ability to pursue bad actors in emerging markets, including with respect to fraud.
PFI Prospectus | Principal LifeTime 2050 Fund | Equity Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Equity Securities Risk. A variety of factors can negatively impact the value of equity securities held by a fund, including a decline in the issuer’s financial condition, unfavorable performance of the issuer’s sector or industry, or changes in response to overall market and economic conditions. A fund’s principal market segment(s) (such as market capitalization or style) may underperform other market segments or the equity markets as a whole.
•Growth Style Risk. Growth investing entails the risk that if growth companies do not increase their earnings at a rate expected by investors, the market price of their stock may decline significantly, even if earnings show an absolute increase. Growth company stocks also typically lack the dividend yield that can lessen price declines in market downturns.
•Smaller Companies Risk. Investments in smaller companies may involve greater risk and price volatility than investments in larger, more mature companies. Smaller companies may have limited product lines, markets, or financial resources; lack the competitive strength of larger companies; have less experienced managers; or depend on a few key employees. Their securities often are less widely held and trade less frequently and in lesser quantities, and their market prices often fluctuate more, than securities of larger companies.
•Value Style Risk. Value investing entails the risk that value stocks may continue to be undervalued by the market for extended periods, including the entire period during which the stock is held by a fund, or the events that would cause the stock price to increase may not occur as anticipated or at all. Moreover, a stock that appears to be undervalued actually may be appropriately priced at a low level and, therefore, would not be profitable for the fund.
PFI Prospectus | Principal LifeTime 2050 Fund | Equity Securities Risk, Growth Style Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Growth Style Risk. Growth investing entails the risk that if growth companies do not increase their earnings at a rate expected by investors, the market price of their stock may decline significantly, even if earnings show an absolute increase. Growth company stocks also typically lack the dividend yield that can lessen price declines in market downturns.
PFI Prospectus | Principal LifeTime 2050 Fund | Equity Securities Risk, Smaller Companies Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Smaller Companies Risk. Investments in smaller companies may involve greater risk and price volatility than investments in larger, more mature companies. Smaller companies may have limited product lines, markets, or financial resources; lack the competitive strength of larger companies; have less experienced managers; or depend on a few key employees. Their securities often are less widely held and trade less frequently and in lesser quantities, and their market prices often fluctuate more, than securities of larger companies.
PFI Prospectus | Principal LifeTime 2050 Fund | Equity Securities Risk, Value Style Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Value Style Risk. Value investing entails the risk that value stocks may continue to be undervalued by the market for extended periods, including the entire period during which the stock is held by a fund, or the events that would cause the stock price to increase may not occur as anticipated or at all. Moreover, a stock that appears to be undervalued actually may be appropriately priced at a low level and, therefore, would not be profitable for the fund.
PFI Prospectus | Principal LifeTime 2050 Fund | Fixed-Income Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Fixed-Income Securities Risk. Fixed-income securities are subject to interest rate, credit quality, and liquidity risks. The market value of fixed-income securities generally declines when interest rates rise, and increased interest rates may adversely affect the liquidity of certain fixed-income securities. Moreover, an issuer of fixed-income securities could default on its payment obligations due to increased interest rates or for other reasons.
PFI Prospectus | Principal LifeTime 2050 Fund | Foreign Currency Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Foreign Currency Risk. Risks of investing in securities denominated in, or that trade in, foreign (non-U.S.) currencies include changes in foreign exchange rates and foreign exchange restrictions.
PFI Prospectus | Principal LifeTime 2050 Fund | Foreign Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Foreign Securities Risk. The risks of foreign securities include loss of value as a result of: political or economic instability; nationalization, expropriation, or confiscatory taxation; settlement delays; and limited government regulation (including less stringent reporting, accounting, and disclosure standards than are required of U.S. companies).
PFI Prospectus | Principal LifeTime 2050 Fund | Fund Of Funds Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Fund of Funds Risk. Fund shareholders bear indirectly their proportionate share of the expenses of other investment companies (for example, other mutual funds or exchange-traded funds) in which the Fund invests (“underlying funds”). The Fund’s selection and weighting of asset classes and allocation of investments in underlying funds may cause it to underperform other funds with a similar investment objective. The Fund’s performance and risks correspond directly to the performance and risks of the underlying funds in which it invests, proportionately in accordance with the weightings of such investments, and there is no assurance that the underlying funds will achieve their investment objectives. Management of the Fund entails potential conflicts of interest: the Fund invests in affiliated underlying funds; and PGI and its affiliates may earn different fees from different underlying funds and may have an incentive to allocate more Fund assets to underlying funds from which they receive higher fees.
PFI Prospectus | Principal LifeTime 2050 Fund | Index Fund Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Index Fund Risk. Index funds use a passive investment approach and generally do not attempt to manage market volatility, use defensive strategies, or reduce the effect of any long-term periods of poor investment performance. Therefore, the Fund may hold securities that present risks that an investment advisor researching individual securities might seek to avoid. An index fund has operating and other expenses while an index does not. As a result, over time, index funds tend to underperform the index. The correlation between fund performance and index performance may also be affected by the type of passive investment approach used by a fund (sampling or replication), changes in securities markets, changes in the composition of the index, and the timing of purchases and sales of fund shares. Errors or delays in compiling or rebalancing the Index may impact the performance of the Fund and increase transaction costs.
PFI Prospectus | Principal LifeTime 2050 Fund | Portfolio Duration Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Portfolio Duration Risk. Portfolio duration is a measure of the expected life of a fixed-income security and its sensitivity to changes in interest rates. The longer a fund’s average portfolio duration, the more sensitive the fund will be to changes in interest rates, which means funds with longer average portfolio durations may be more volatile than those with shorter durations.
PFI Prospectus | Principal LifeTime 2050 Fund | Redemption And Large Transaction Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Redemption and Large Transaction Risk. Ownership of the Fund’s shares may be concentrated in one or a few large investors (such as funds of funds, institutional investors, and asset allocation programs) that may redeem or purchase shares in large quantities. These transactions may cause the Fund to sell securities to meet redemptions or to invest additional cash at times it would not otherwise do so, which may result in increased transaction costs, increased expenses, changes to expense ratios, and adverse effects to Fund performance. Such transactions may also accelerate the realization of taxable income if sales of portfolio securities result in gains. Moreover, reallocations by large shareholders among share classes of a fund may result in changes to the expense ratios of affected classes, which may increase the expenses paid by shareholders of the class that experienced the redemption.
PFI Prospectus | Principal LifeTime 2050 Fund | Target Date Fund Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Target Date Fund Risk. A target date fund should not be selected based solely on age or retirement date because there is no guarantee that this Fund will provide adequate income at or through retirement.
PFI Prospectus | Principal LifeTime 2050 Fund | S&P 1500 TR (reflects no deduction for fees, expenses, or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
Label rr_AverageAnnualReturnLabel S&P 1500 TR (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 25.47%
5 Years rr_AverageAnnualReturnYear05 15.39%
10 Years rr_AverageAnnualReturnYear10 11.76%
PFI Prospectus | Principal LifeTime 2050 Fund | S&P Target Date 2050 Index (reflects no deduction for fees, expenses, or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
Label rr_AverageAnnualReturnLabel S&P Target Date 2050 Index (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 19.58%
5 Years rr_AverageAnnualReturnYear05 10.92%
10 Years rr_AverageAnnualReturnYear10 7.92%
PFI Prospectus | Principal LifeTime 2050 Fund | Class A  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PPEAX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 5.50%
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.21%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.66%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.12%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.08%) [37]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.04%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 650
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 879
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,126
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,831
Annual Return 2014 rr_AnnualReturn2014 5.83%
Annual Return 2015 rr_AnnualReturn2015 (1.08%)
Annual Return 2016 rr_AnnualReturn2016 5.20%
Annual Return 2017 rr_AnnualReturn2017 21.66%
Annual Return 2018 rr_AnnualReturn2018 (9.07%)
Annual Return 2019 rr_AnnualReturn2019 26.23%
Annual Return 2020 rr_AnnualReturn2020 16.10%
Annual Return 2021 rr_AnnualReturn2021 16.75%
Annual Return 2022 rr_AnnualReturn2022 (19.12%)
Annual Return 2023 rr_AnnualReturn2023 19.94%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Highest return for a quarter during the period of the bar chart above:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 19.45%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Lowest return for a quarter during the period of the bar chart above:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (20.88%)
Label rr_AverageAnnualReturnLabel Class A Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 13.34%
5 Years rr_AverageAnnualReturnYear05 9.42%
10 Years rr_AverageAnnualReturnYear10 6.69%
PFI Prospectus | Principal LifeTime 2050 Fund | Class A | After Taxes on Distributions  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Class A Return After Taxes on Distributions
1 Year rr_AverageAnnualReturnYear01 12.22%
5 Years rr_AverageAnnualReturnYear05 7.71%
10 Years rr_AverageAnnualReturnYear10 5.08%
PFI Prospectus | Principal LifeTime 2050 Fund | Class A | After Taxes on Distributions and Sales  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Class A Return After Taxes on Distributions and Sale of Fund Shares
1 Year rr_AverageAnnualReturnYear01 8.59%
5 Years rr_AverageAnnualReturnYear05 7.21%
10 Years rr_AverageAnnualReturnYear10 4.97%
PFI Prospectus | Principal LifeTime 2050 Fund | Class J  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PFLJX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.15%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.10%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.66%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.91%
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.91%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 193
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 290
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 504
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,120
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 93
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 290
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 504
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,120
Label rr_AverageAnnualReturnLabel Class J Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 19.09%
5 Years rr_AverageAnnualReturnYear05 10.83%
10 Years rr_AverageAnnualReturnYear10 7.40%
PFI Prospectus | Principal LifeTime 2050 Fund | Institutional Class  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PPLIX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.01%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.66%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.67%
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.67%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 68
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 214
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 373
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 835
Label rr_AverageAnnualReturnLabel Institutional Class Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 20.40%
5 Years rr_AverageAnnualReturnYear05 11.07%
10 Years rr_AverageAnnualReturnYear10 7.70%
PFI Prospectus | Principal LifeTime 2050 Fund | Class R-1  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PZASX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.35%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.53%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.66%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.54%
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.54%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 157
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 486
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 839
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,834
Label rr_AverageAnnualReturnLabel Class R-1 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 19.36%
5 Years rr_AverageAnnualReturnYear05 10.10%
10 Years rr_AverageAnnualReturnYear10 6.76%
PFI Prospectus | Principal LifeTime 2050 Fund | Class R-3  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PTERX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.32%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.66%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.23%
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.23%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 125
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 390
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 676
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,489
Label rr_AverageAnnualReturnLabel Class R-3 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 19.69%
5 Years rr_AverageAnnualReturnYear05 10.45%
10 Years rr_AverageAnnualReturnYear10 7.09%
PFI Prospectus | Principal LifeTime 2050 Fund | Class R-4  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PTESX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.10%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.28%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.66%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.04%
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.04%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 106
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 331
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 574
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,271
Label rr_AverageAnnualReturnLabel Class R-4 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 19.93%
5 Years rr_AverageAnnualReturnYear05 10.65%
10 Years rr_AverageAnnualReturnYear10 7.29%
PFI Prospectus | Principal LifeTime 2050 Fund | Class R-5  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PTEFX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.26%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.66%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.92%
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.92%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 94
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 293
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 509
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,131
Label rr_AverageAnnualReturnLabel Class R-5 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 20.15%
5 Years rr_AverageAnnualReturnYear05 10.79%
10 Years rr_AverageAnnualReturnYear10 7.42%
PFI Prospectus | Principal LifeTime 2055 Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading PRINCIPAL LIFETIME 2055 FUND
Objective [Heading] rr_ObjectiveHeading Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The Fund seeks a total return consisting of long-term growth of capital and current income.
Expense [Heading] rr_ExpenseHeading Fees and Expenses of the Fund
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock
This table describes the fees and expenses that you may pay if you buy, hold, and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below.
If you purchase Institutional Class shares through certain programs offered by certain financial intermediaries, you may be required to pay a commission and/or other forms of compensation to the broker, or to your Financial Professional or other financial intermediary.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder Fees (fees paid directly from your investment):
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock
The Fund and each underlying fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs. These costs, which are not reflected in Annual Fund Operating Expenses or in the Example, affect the Fund’s and the underlying fund's performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 10.3% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 10.30%
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
The Fund operates as a “target date fund” that invests according to an asset allocation strategy designed for investors having a retirement investment goal close to the year in the Fund’s name. The Fund is a fund of funds and invests in underlying funds of Principal Funds, Inc. (“PFI”). Its underlying funds consist of domestic and foreign equity funds, fixed-income funds, real asset funds, and other funds that aim to offer diversification beyond traditional equity and fixed-income securities. The asset class diversification of the Fund is designed to moderate overall price volatility. The Fund may add, remove, or substitute underlying funds at any time.
The Fund is managed with strategic or long-term asset class targets and target ranges. There is a rebalancing strategy that aligns with the target weights to identify asset classes that are either overweight or underweight. The Fund may shift asset class targets in response to normal evaluative processes, the shortening time horizon of the Fund, or changes in market forces or Fund circumstances.
In selecting underlying funds and target weights, the Fund considers both quantitative measures (e.g., past performance, expected levels of risk and returns, expense levels, diversification, and style consistency) and qualitative factors (e.g., organizational stability, investment experience, investment and risk management processes, and information, trading, and compliance systems). There are no minimum or maximum percentages of assets that the Fund must invest in a specific asset class or underlying fund.
The underlying funds invest in growth and value stocks of small, medium, and large market capitalization companies, fixed-income securities, domestic and foreign (including those in emerging markets) securities, securities denominated in foreign currencies, investment companies (including index funds), and derivatives. A derivative is a financial arrangement, the value of which is derived from, or based on, a traditional security, asset, or market index. The underlying funds principally use equity index futures and options in order to gain exposure to a variety of securities or asset classes or attempt to reduce risk.
The Fund’s asset allocation will become more conservative over time as investment goals near (for example, retirement, which is assumed to begin at age 65) and investors become more risk-averse. Approximately 10 years after its target year, the Fund’s underlying fund allocation is expected to match that of the Principal LifeTime Strategic Income Fund. At that time, the Fund may be combined with the Principal LifeTime Strategic Income Fund if the Board of Directors determines that the combination is in the best interests of Fund shareholders. It is expected that at the target date in the Fund’s name, the shareholder will begin gradually withdrawing the account’s value.
LT Glidepath.jpg
Risk [Heading] rr_RiskHeading Principal Risks
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
The following information provides some indication of the risks of investing in the Fund. Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. You may get updated performance information at www.PrincipalAM.com.
The bar chart shows the investment returns of the Fund’s Institutional Class shares for each full calendar year of operations for 10 years (or, if shorter, the life of the Fund). The table shows for the last one, five, and ten calendar year periods (or, if shorter, the life of the Fund), how the Fund’s average annual total returns compare with those of one or more broad measures of market performance.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following information provides some indication of the risks of investing in the Fund.
Performance Additional Market Index [Text] rr_PerformanceAdditionalMarketIndex The S&P Target Date 2055 Index is included as an additional index for the Fund as it shows how the Fund’s performance compares with the returns of an index of funds with similar investment objectives.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.PrincipalAM.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.
Bar Chart [Heading] rr_BarChartHeading Total Returns as of December 31
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
Highest return for a quarter during the period of the bar chart above:Q2 202019.93 %
Lowest return for a quarter during the period of the bar chart above:Q1 2020(21.46)%
Performance Table Heading rr_PerformanceTableHeading Average Annual Total ReturnsFor the periods ended December 31, 2023
Performance Table Market Index Changed rr_PerformanceTableMarketIndexChanged Effective March 1, 2024, the Fund changed its primary broad-based index to the S&P 1500 TR in order to meet the revised definition of “broad-based securities market index.”
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are shown for Institutional Class shares only and would be different for the other share classes.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock
After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. After-tax returns are shown for Institutional Class shares only and would be different for the other share classes.
Effective March 1, 2024, the Fund changed its primary broad-based index to the S&P 1500 TR in order to meet the revised definition of “broad-based securities market index.” The S&P Target Date 2055 Index is included as an additional index for the Fund as it shows how the Fund’s performance compares with the returns of an index of funds with similar investment objectives.
PFI Prospectus | Principal LifeTime 2055 Fund | Risk Lose Money [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Many factors affect that value, and it is possible to lose money by investing in the Fund.
PFI Prospectus | Principal LifeTime 2055 Fund | Risk Not Insured Depository Institution [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
PFI Prospectus | Principal LifeTime 2055 Fund | Counterparty Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Counterparty Risk. Counterparty risk is the risk that the counterparty to a contract or other obligation will be unable or unwilling to honor its obligations.
PFI Prospectus | Principal LifeTime 2055 Fund | Derivatives Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Derivatives Risk. Derivatives may not move in the direction anticipated by the portfolio manager. Transactions in derivatives may increase volatility, cause the liquidation of portfolio positions when not advantageous to do so, and result in disproportionate losses that may be substantially greater than a fund’s initial investment.
•Futures. Futures contracts involve specific risks, including: the imperfect correlation between the change in market value of the instruments held by the Fund and the price of the futures contract; possible lack of a liquid secondary market for a futures contract and the resulting inability to close a futures contract when desired; counterparty risk; and if the Fund has insufficient cash, it may have to sell securities from its portfolio to meet daily variation margin requirements.
•Options. Options involve specific risks, including: the imperfect correlation between the change in market value of the instruments held by the Fund and the price of the options; counterparty risk; difference in trading hours for the options markets and the markets for the underlying securities (rate movements can take place in the underlying markets that cannot be reflected in the options markets); and an insufficient liquid secondary market for particular options.
PFI Prospectus | Principal LifeTime 2055 Fund | Derivatives Risk, Futures Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Futures. Futures contracts involve specific risks, including: the imperfect correlation between the change in market value of the instruments held by the Fund and the price of the futures contract; possible lack of a liquid secondary market for a futures contract and the resulting inability to close a futures contract when desired; counterparty risk; and if the Fund has insufficient cash, it may have to sell securities from its portfolio to meet daily variation margin requirements.
PFI Prospectus | Principal LifeTime 2055 Fund | Derivatives Risk, Options Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Options. Options involve specific risks, including: the imperfect correlation between the change in market value of the instruments held by the Fund and the price of the options; counterparty risk; difference in trading hours for the options markets and the markets for the underlying securities (rate movements can take place in the underlying markets that cannot be reflected in the options markets); and an insufficient liquid secondary market for particular options.
PFI Prospectus | Principal LifeTime 2055 Fund | Emerging Markets Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Emerging Markets Risk. Investments in emerging markets may have more risk than those in developed markets because the emerging markets are less developed and more illiquid. Emerging markets can also be subject to increased social, economic, regulatory, and political uncertainties and can be extremely volatile. The U.S. Securities and Exchange Commission, the U.S. Department of Justice, and other U.S. authorities may be limited in their ability to pursue bad actors in emerging markets, including with respect to fraud.
PFI Prospectus | Principal LifeTime 2055 Fund | Equity Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Equity Securities Risk. A variety of factors can negatively impact the value of equity securities held by a fund, including a decline in the issuer’s financial condition, unfavorable performance of the issuer’s sector or industry, or changes in response to overall market and economic conditions. A fund’s principal market segment(s) (such as market capitalization or style) may underperform other market segments or the equity markets as a whole.
•Growth Style Risk. Growth investing entails the risk that if growth companies do not increase their earnings at a rate expected by investors, the market price of their stock may decline significantly, even if earnings show an absolute increase. Growth company stocks also typically lack the dividend yield that can lessen price declines in market downturns.
•Smaller Companies Risk. Investments in smaller companies may involve greater risk and price volatility than investments in larger, more mature companies. Smaller companies may have limited product lines, markets, or financial resources; lack the competitive strength of larger companies; have less experienced managers; or depend on a few key employees. Their securities often are less widely held and trade less frequently and in lesser quantities, and their market prices often fluctuate more, than securities of larger companies.
•Value Style Risk. Value investing entails the risk that value stocks may continue to be undervalued by the market for extended periods, including the entire period during which the stock is held by a fund, or the events that would cause the stock price to increase may not occur as anticipated or at all. Moreover, a stock that appears to be undervalued actually may be appropriately priced at a low level and, therefore, would not be profitable for the fund.
PFI Prospectus | Principal LifeTime 2055 Fund | Equity Securities Risk, Growth Style Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Growth Style Risk. Growth investing entails the risk that if growth companies do not increase their earnings at a rate expected by investors, the market price of their stock may decline significantly, even if earnings show an absolute increase. Growth company stocks also typically lack the dividend yield that can lessen price declines in market downturns.
PFI Prospectus | Principal LifeTime 2055 Fund | Equity Securities Risk, Smaller Companies Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Smaller Companies Risk. Investments in smaller companies may involve greater risk and price volatility than investments in larger, more mature companies. Smaller companies may have limited product lines, markets, or financial resources; lack the competitive strength of larger companies; have less experienced managers; or depend on a few key employees. Their securities often are less widely held and trade less frequently and in lesser quantities, and their market prices often fluctuate more, than securities of larger companies.
PFI Prospectus | Principal LifeTime 2055 Fund | Equity Securities Risk, Value Style Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Value Style Risk. Value investing entails the risk that value stocks may continue to be undervalued by the market for extended periods, including the entire period during which the stock is held by a fund, or the events that would cause the stock price to increase may not occur as anticipated or at all. Moreover, a stock that appears to be undervalued actually may be appropriately priced at a low level and, therefore, would not be profitable for the fund.
PFI Prospectus | Principal LifeTime 2055 Fund | Fixed-Income Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Fixed-Income Securities Risk. Fixed-income securities are subject to interest rate, credit quality, and liquidity risks. The market value of fixed-income securities generally declines when interest rates rise, and increased interest rates may adversely affect the liquidity of certain fixed-income securities. Moreover, an issuer of fixed-income securities could default on its payment obligations due to increased interest rates or for other reasons.
PFI Prospectus | Principal LifeTime 2055 Fund | Foreign Currency Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Foreign Currency Risk. Risks of investing in securities denominated in, or that trade in, foreign (non-U.S.) currencies include changes in foreign exchange rates and foreign exchange restrictions.
PFI Prospectus | Principal LifeTime 2055 Fund | Foreign Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Foreign Securities Risk. The risks of foreign securities include loss of value as a result of: political or economic instability; nationalization, expropriation, or confiscatory taxation; settlement delays; and limited government regulation (including less stringent reporting, accounting, and disclosure standards than are required of U.S. companies).
PFI Prospectus | Principal LifeTime 2055 Fund | Fund Of Funds Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Fund of Funds Risk. Fund shareholders bear indirectly their proportionate share of the expenses of other investment companies (for example, other mutual funds or exchange-traded funds) in which the Fund invests (“underlying funds”). The Fund’s selection and weighting of asset classes and allocation of investments in underlying funds may cause it to underperform other funds with a similar investment objective. The Fund’s performance and risks correspond directly to the performance and risks of the underlying funds in which it invests, proportionately in accordance with the weightings of such investments, and there is no assurance that the underlying funds will achieve their investment objectives. Management of the Fund entails potential conflicts of interest: the Fund invests in affiliated underlying funds; and PGI and its affiliates may earn different fees from different underlying funds and may have an incentive to allocate more Fund assets to underlying funds from which they receive higher fees.
PFI Prospectus | Principal LifeTime 2055 Fund | Index Fund Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Index Fund Risk. Index funds use a passive investment approach and generally do not attempt to manage market volatility, use defensive strategies, or reduce the effect of any long-term periods of poor investment performance. Therefore, the Fund may hold securities that present risks that an investment advisor researching individual securities might seek to avoid. An index fund has operating and other expenses while an index does not. As a result, over time, index funds tend to underperform the index. The correlation between fund performance and index performance may also be affected by the type of passive investment approach used by a fund (sampling or replication), changes in securities markets, changes in the composition of the index, and the timing of purchases and sales of fund shares. Errors or delays in compiling or rebalancing the Index may impact the performance of the Fund and increase transaction costs.
PFI Prospectus | Principal LifeTime 2055 Fund | Portfolio Duration Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Portfolio Duration Risk. Portfolio duration is a measure of the expected life of a fixed-income security and its sensitivity to changes in interest rates. The longer a fund’s average portfolio duration, the more sensitive the fund will be to changes in interest rates, which means funds with longer average portfolio durations may be more volatile than those with shorter durations.
PFI Prospectus | Principal LifeTime 2055 Fund | Redemption And Large Transaction Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Redemption and Large Transaction Risk. Ownership of the Fund’s shares may be concentrated in one or a few large investors (such as funds of funds, institutional investors, and asset allocation programs) that may redeem or purchase shares in large quantities. These transactions may cause the Fund to sell securities to meet redemptions or to invest additional cash at times it would not otherwise do so, which may result in increased transaction costs, increased expenses, changes to expense ratios, and adverse effects to Fund performance. Such transactions may also accelerate the realization of taxable income if sales of portfolio securities result in gains. Moreover, reallocations by large shareholders among share classes of a fund may result in changes to the expense ratios of affected classes, which may increase the expenses paid by shareholders of the class that experienced the redemption.
PFI Prospectus | Principal LifeTime 2055 Fund | Target Date Fund Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Target Date Fund Risk. A target date fund should not be selected based solely on age or retirement date because there is no guarantee that this Fund will provide adequate income at or through retirement.
PFI Prospectus | Principal LifeTime 2055 Fund | S&P 1500 TR (reflects no deduction for fees, expenses, or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
Label rr_AverageAnnualReturnLabel S&P 1500 TR (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 25.47%
5 Years rr_AverageAnnualReturnYear05 15.39%
10 Years rr_AverageAnnualReturnYear10 11.76%
PFI Prospectus | Principal LifeTime 2055 Fund | S&P Target Date 2055 Index (reflects no deduction for fees, expenses, or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
Label rr_AverageAnnualReturnLabel S&P Target Date 2055 Index (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 19.62%
5 Years rr_AverageAnnualReturnYear05 10.98%
10 Years rr_AverageAnnualReturnYear10 7.99%
PFI Prospectus | Principal LifeTime 2055 Fund | Institutional Class  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol LTFIX
Shareholder Fee, Other rr_ShareholderFeeOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.01%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.66%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.67%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 68
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 214
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 373
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 835
Annual Return 2014 rr_AnnualReturn2014 6.29%
Annual Return 2015 rr_AnnualReturn2015 (0.75%)
Annual Return 2016 rr_AnnualReturn2016 5.72%
Annual Return 2017 rr_AnnualReturn2017 22.53%
Annual Return 2018 rr_AnnualReturn2018 (9.00%)
Annual Return 2019 rr_AnnualReturn2019 27.24%
Annual Return 2020 rr_AnnualReturn2020 16.47%
Annual Return 2021 rr_AnnualReturn2021 17.77%
Annual Return 2022 rr_AnnualReturn2022 (18.85%)
Annual Return 2023 rr_AnnualReturn2023 20.38%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Highest return for a quarter during the period of the bar chart above:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 19.93%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Lowest return for a quarter during the period of the bar chart above:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (21.46%)
Label rr_AverageAnnualReturnLabel Institutional Class Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 20.38%
5 Years rr_AverageAnnualReturnYear05 11.26%
10 Years rr_AverageAnnualReturnYear10 7.80%
PFI Prospectus | Principal LifeTime 2055 Fund | Institutional Class | After Taxes on Distributions  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Institutional Class Return After Taxes on Distributions
1 Year rr_AverageAnnualReturnYear01 19.14%
5 Years rr_AverageAnnualReturnYear05 9.70%
10 Years rr_AverageAnnualReturnYear10 6.38%
PFI Prospectus | Principal LifeTime 2055 Fund | Institutional Class | After Taxes on Distributions and Sales  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Institutional Class Return After Taxes on Distributions and Sale of Fund Shares
1 Year rr_AverageAnnualReturnYear01 12.81%
5 Years rr_AverageAnnualReturnYear05 8.71%
10 Years rr_AverageAnnualReturnYear10 5.94%
PFI Prospectus | Principal LifeTime 2055 Fund | Class R-1  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol LTFGX
Shareholder Fee, Other rr_ShareholderFeeOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.35%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.54%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.66%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.55%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 158
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 490
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 845
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,845
Label rr_AverageAnnualReturnLabel Class R-1 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 19.35%
5 Years rr_AverageAnnualReturnYear05 10.30%
10 Years rr_AverageAnnualReturnYear10 6.87%
PFI Prospectus | Principal LifeTime 2055 Fund | Class R-3  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol LTFDX
Shareholder Fee, Other rr_ShareholderFeeOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.33%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.66%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.24%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 126
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 393
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 681
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,500
Label rr_AverageAnnualReturnLabel Class R-3 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 19.70%
5 Years rr_AverageAnnualReturnYear05 10.65%
10 Years rr_AverageAnnualReturnYear10 7.20%
PFI Prospectus | Principal LifeTime 2055 Fund | Class R-4  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol LTFLX
Shareholder Fee, Other rr_ShareholderFeeOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.10%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.29%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.66%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.05%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 107
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 334
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 579
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,283
Label rr_AverageAnnualReturnLabel Class R-4 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 19.93%
5 Years rr_AverageAnnualReturnYear05 10.86%
10 Years rr_AverageAnnualReturnYear10 7.41%
PFI Prospectus | Principal LifeTime 2055 Fund | Class R-5  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol LTFPX
Shareholder Fee, Other rr_ShareholderFeeOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.27%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.66%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.93%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 95
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 296
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 515
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,143
Label rr_AverageAnnualReturnLabel Class R-5 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 20.05%
5 Years rr_AverageAnnualReturnYear05 10.98%
10 Years rr_AverageAnnualReturnYear10 7.53%
PFI Prospectus | Principal LifeTime 2060 Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading PRINCIPAL LIFETIME 2060 FUND
Objective [Heading] rr_ObjectiveHeading Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The Fund seeks a total return consisting of long-term growth of capital and current income.
Expense [Heading] rr_ExpenseHeading Fees and Expenses of the Fund
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock
This table describes the fees and expenses that you may pay if you buy, hold, and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below.
If you purchase Institutional Class shares through certain programs offered by certain financial intermediaries, you may be required to pay a commission and/or other forms of compensation to the broker, or to your Financial Professional or other financial intermediary.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder Fees (fees paid directly from your investment)
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination February 28, 2025
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock
The Fund and each underlying fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs. These costs, which are not reflected in Annual Fund Operating Expenses or in the Example, affect the Fund’s and the underlying fund's performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 10.6% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 10.60%
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. The calculation of costs takes into account any applicable contractual fee waivers and/or expense reimbursements for the period noted in the table above. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, No Redemption, By Year, Caption [Text] rr_ExpenseExampleNoRedemptionByYearCaption With respect to Class J shares, you would pay the following expenses if you did not redeem your shares (all other classes would be the same as in the above example):
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
The Fund operates as a “target date fund” that invests according to an asset allocation strategy designed for investors having a retirement investment goal close to the year in the Fund’s name. The Fund is a fund of funds and invests in underlying funds of Principal Funds, Inc. (“PFI”). Its underlying funds consist of domestic and foreign equity funds, fixed-income funds, real asset funds, and other funds that aim to offer diversification beyond traditional equity and fixed-income securities. The asset class diversification of the Fund is designed to moderate overall price volatility. The Fund may add, remove, or substitute underlying funds at any time.
The Fund is managed with strategic or long-term asset class targets and target ranges. There is a rebalancing strategy that aligns with the target weights to identify asset classes that are either overweight or underweight. The Fund may shift asset class targets in response to normal evaluative processes, the shortening time horizon of the Fund, or changes in market forces or Fund circumstances.
In selecting underlying funds and target weights, the Fund considers both quantitative measures (e.g., past performance, expected levels of risk and returns, expense levels, diversification, and style consistency) and qualitative factors (e.g., organizational stability, investment experience, investment and risk management processes, and information, trading, and compliance systems). There are no minimum or maximum percentages of assets that the Fund must invest in a specific asset class or underlying fund.
The underlying funds invest in growth and value stocks of small, medium, and large market capitalization companies, fixed-income securities, domestic and foreign (including those in emerging markets) securities, securities denominated in foreign currencies, investment companies (including index funds), and derivatives. A derivative is a financial arrangement, the value of which is derived from, or based on, a traditional security, asset, or market index. The underlying funds principally use equity index futures and options in order to gain exposure to a variety of securities or asset classes or attempt to reduce risk.
The Fund’s asset allocation will become more conservative over time as investment goals near (for example, retirement, which is assumed to begin at age 65) and investors become more risk-averse. Approximately 10 years after its target year, the Fund’s underlying fund allocation is expected to match that of the Principal LifeTime Strategic Income Fund. At that time, the Fund may be combined with the Principal LifeTime Strategic Income Fund if the Board of Directors determines that the combination is in the best interests of Fund shareholders. It is expected that at the target date in the Fund’s name, the shareholder will begin gradually withdrawing the account’s value.
LT Glidepath.jpg
Risk [Heading] rr_RiskHeading Principal Risks
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
The following information provides some indication of the risks of investing in the Fund. Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. You may get updated performance information at www.PrincipalAM.com.
The bar chart shows the investment returns of the Fund’s Institutional Class shares for each full calendar year of operations for 10 years (or, if shorter, the life of the Fund). The table shows for the last one, five, and ten calendar year periods (or, if shorter, the life of the Fund), how the Fund’s average annual total returns compare with those of one or more broad measures of market performance.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following information provides some indication of the risks of investing in the Fund.
Performance Additional Market Index [Text] rr_PerformanceAdditionalMarketIndex The S&P Target Date 2060 Index is included as an additional index for the Fund as it shows how the Fund’s performance compares with the returns of an index of funds with similar investment objectives.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.PrincipalAM.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.
Bar Chart [Heading] rr_BarChartHeading Total Returns as of December 31
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
Highest return for a quarter during the period of the bar chart above:Q2 202020.12 %
Lowest return for a quarter during the period of the bar chart above:Q1 2020(21.80)%
Performance Table Heading rr_PerformanceTableHeading Average Annual Total ReturnsFor the periods ended December 31, 2023
Performance Table Market Index Changed rr_PerformanceTableMarketIndexChanged Effective March 1, 2024, the Fund changed its primary broad-based index to the S&P 1500 TR in order to meet the revised definition of “broad-based securities market index.”
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are shown for Institutional Class shares only and would be different for the other share classes.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock
After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. After-tax returns are shown for Institutional Class shares only and would be different for the other share classes.
Effective March 1, 2024, the Fund changed its primary broad-based index to the S&P 1500 TR in order to meet the revised definition of “broad-based securities market index.” The S&P Target Date 2060 Index is included as an additional index for the Fund as it shows how the Fund’s performance compares with the returns of an index of funds with similar investment objectives.
PFI Prospectus | Principal LifeTime 2060 Fund | Risk Lose Money [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Many factors affect that value, and it is possible to lose money by investing in the Fund.
PFI Prospectus | Principal LifeTime 2060 Fund | Risk Not Insured Depository Institution [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
PFI Prospectus | Principal LifeTime 2060 Fund | Counterparty Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Counterparty Risk. Counterparty risk is the risk that the counterparty to a contract or other obligation will be unable or unwilling to honor its obligations.
PFI Prospectus | Principal LifeTime 2060 Fund | Derivatives Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Derivatives Risk. Derivatives may not move in the direction anticipated by the portfolio manager. Transactions in derivatives may increase volatility, cause the liquidation of portfolio positions when not advantageous to do so, and result in disproportionate losses that may be substantially greater than a fund’s initial investment.
•Futures. Futures contracts involve specific risks, including: the imperfect correlation between the change in market value of the instruments held by the Fund and the price of the futures contract; possible lack of a liquid secondary market for a futures contract and the resulting inability to close a futures contract when desired; counterparty risk; and if the Fund has insufficient cash, it may have to sell securities from its portfolio to meet daily variation margin requirements.
•Options. Options involve specific risks, including: the imperfect correlation between the change in market value of the instruments held by the Fund and the price of the options; counterparty risk; difference in trading hours for the options markets and the markets for the underlying securities (rate movements can take place in the underlying markets that cannot be reflected in the options markets); and an insufficient liquid secondary market for particular options.
PFI Prospectus | Principal LifeTime 2060 Fund | Derivatives Risk, Futures Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Futures. Futures contracts involve specific risks, including: the imperfect correlation between the change in market value of the instruments held by the Fund and the price of the futures contract; possible lack of a liquid secondary market for a futures contract and the resulting inability to close a futures contract when desired; counterparty risk; and if the Fund has insufficient cash, it may have to sell securities from its portfolio to meet daily variation margin requirements.
PFI Prospectus | Principal LifeTime 2060 Fund | Derivatives Risk, Options Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Options. Options involve specific risks, including: the imperfect correlation between the change in market value of the instruments held by the Fund and the price of the options; counterparty risk; difference in trading hours for the options markets and the markets for the underlying securities (rate movements can take place in the underlying markets that cannot be reflected in the options markets); and an insufficient liquid secondary market for particular options.
PFI Prospectus | Principal LifeTime 2060 Fund | Emerging Markets Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Emerging Markets Risk. Investments in emerging markets may have more risk than those in developed markets because the emerging markets are less developed and more illiquid. Emerging markets can also be subject to increased social, economic, regulatory, and political uncertainties and can be extremely volatile. The U.S. Securities and Exchange Commission, the U.S. Department of Justice, and other U.S. authorities may be limited in their ability to pursue bad actors in emerging markets, including with respect to fraud.
PFI Prospectus | Principal LifeTime 2060 Fund | Equity Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Equity Securities Risk. A variety of factors can negatively impact the value of equity securities held by a fund, including a decline in the issuer’s financial condition, unfavorable performance of the issuer’s sector or industry, or changes in response to overall market and economic conditions. A fund’s principal market segment(s) (such as market capitalization or style) may underperform other market segments or the equity markets as a whole.
•Growth Style Risk. Growth investing entails the risk that if growth companies do not increase their earnings at a rate expected by investors, the market price of their stock may decline significantly, even if earnings show an absolute increase. Growth company stocks also typically lack the dividend yield that can lessen price declines in market downturns.
•Smaller Companies Risk. Investments in smaller companies may involve greater risk and price volatility than investments in larger, more mature companies. Smaller companies may have limited product lines, markets, or financial resources; lack the competitive strength of larger companies; have less experienced managers; or depend on a few key employees. Their securities often are less widely held and trade less frequently and in lesser quantities, and their market prices often fluctuate more, than securities of larger companies.
•Value Style Risk. Value investing entails the risk that value stocks may continue to be undervalued by the market for extended periods, including the entire period during which the stock is held by a fund, or the events that would cause the stock price to increase may not occur as anticipated or at all. Moreover, a stock that appears to be undervalued actually may be appropriately priced at a low level and, therefore, would not be profitable for the fund.
PFI Prospectus | Principal LifeTime 2060 Fund | Equity Securities Risk, Growth Style Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Growth Style Risk. Growth investing entails the risk that if growth companies do not increase their earnings at a rate expected by investors, the market price of their stock may decline significantly, even if earnings show an absolute increase. Growth company stocks also typically lack the dividend yield that can lessen price declines in market downturns.
PFI Prospectus | Principal LifeTime 2060 Fund | Equity Securities Risk, Smaller Companies Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Smaller Companies Risk. Investments in smaller companies may involve greater risk and price volatility than investments in larger, more mature companies. Smaller companies may have limited product lines, markets, or financial resources; lack the competitive strength of larger companies; have less experienced managers; or depend on a few key employees. Their securities often are less widely held and trade less frequently and in lesser quantities, and their market prices often fluctuate more, than securities of larger companies.
PFI Prospectus | Principal LifeTime 2060 Fund | Equity Securities Risk, Value Style Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Value Style Risk. Value investing entails the risk that value stocks may continue to be undervalued by the market for extended periods, including the entire period during which the stock is held by a fund, or the events that would cause the stock price to increase may not occur as anticipated or at all. Moreover, a stock that appears to be undervalued actually may be appropriately priced at a low level and, therefore, would not be profitable for the fund.
PFI Prospectus | Principal LifeTime 2060 Fund | Fixed-Income Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Fixed-Income Securities Risk. Fixed-income securities are subject to interest rate, credit quality, and liquidity risks. The market value of fixed-income securities generally declines when interest rates rise, and increased interest rates may adversely affect the liquidity of certain fixed-income securities. Moreover, an issuer of fixed-income securities could default on its payment obligations due to increased interest rates or for other reasons.
PFI Prospectus | Principal LifeTime 2060 Fund | Foreign Currency Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Foreign Currency Risk. Risks of investing in securities denominated in, or that trade in, foreign (non-U.S.) currencies include changes in foreign exchange rates and foreign exchange restrictions.
PFI Prospectus | Principal LifeTime 2060 Fund | Foreign Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Foreign Securities Risk. The risks of foreign securities include loss of value as a result of: political or economic instability; nationalization, expropriation, or confiscatory taxation; settlement delays; and limited government regulation (including less stringent reporting, accounting, and disclosure standards than are required of U.S. companies).
PFI Prospectus | Principal LifeTime 2060 Fund | Fund Of Funds Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Fund of Funds Risk. Fund shareholders bear indirectly their proportionate share of the expenses of other investment companies (for example, other mutual funds or exchange-traded funds) in which the Fund invests (“underlying funds”). The Fund’s selection and weighting of asset classes and allocation of investments in underlying funds may cause it to underperform other funds with a similar investment objective. The Fund’s performance and risks correspond directly to the performance and risks of the underlying funds in which it invests, proportionately in accordance with the weightings of such investments, and there is no assurance that the underlying funds will achieve their investment objectives. Management of the Fund entails potential conflicts of interest: the Fund invests in affiliated underlying funds; and PGI and its affiliates may earn different fees from different underlying funds and may have an incentive to allocate more Fund assets to underlying funds from which they receive higher fees.
PFI Prospectus | Principal LifeTime 2060 Fund | Index Fund Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Index Fund Risk. Index funds use a passive investment approach and generally do not attempt to manage market volatility, use defensive strategies, or reduce the effect of any long-term periods of poor investment performance. Therefore, the Fund may hold securities that present risks that an investment advisor researching individual securities might seek to avoid. An index fund has operating and other expenses while an index does not. As a result, over time, index funds tend to underperform the index. The correlation between fund performance and index performance may also be affected by the type of passive investment approach used by a fund (sampling or replication), changes in securities markets, changes in the composition of the index, and the timing of purchases and sales of fund shares. Errors or delays in compiling or rebalancing the Index may impact the performance of the Fund and increase transaction costs.
PFI Prospectus | Principal LifeTime 2060 Fund | Portfolio Duration Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Portfolio Duration Risk. Portfolio duration is a measure of the expected life of a fixed-income security and its sensitivity to changes in interest rates. The longer a fund’s average portfolio duration, the more sensitive the fund will be to changes in interest rates, which means funds with longer average portfolio durations may be more volatile than those with shorter durations.
PFI Prospectus | Principal LifeTime 2060 Fund | Redemption And Large Transaction Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Redemption and Large Transaction Risk. Ownership of the Fund’s shares may be concentrated in one or a few large investors (such as funds of funds, institutional investors, and asset allocation programs) that may redeem or purchase shares in large quantities. These transactions may cause the Fund to sell securities to meet redemptions or to invest additional cash at times it would not otherwise do so, which may result in increased transaction costs, increased expenses, changes to expense ratios, and adverse effects to Fund performance. Such transactions may also accelerate the realization of taxable income if sales of portfolio securities result in gains. Moreover, reallocations by large shareholders among share classes of a fund may result in changes to the expense ratios of affected classes, which may increase the expenses paid by shareholders of the class that experienced the redemption.
PFI Prospectus | Principal LifeTime 2060 Fund | Target Date Fund Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Target Date Fund Risk. A target date fund should not be selected based solely on age or retirement date because there is no guarantee that this Fund will provide adequate income at or through retirement.
PFI Prospectus | Principal LifeTime 2060 Fund | S&P 1500 TR (reflects no deduction for fees, expenses, or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
Label rr_AverageAnnualReturnLabel S&P 1500 TR (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 25.47%
5 Years rr_AverageAnnualReturnYear05 15.39%
10 Years rr_AverageAnnualReturnYear10 11.76%
PFI Prospectus | Principal LifeTime 2060 Fund | S&P Target Date 2060 Index (reflects no deduction for fees, expenses, or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
Label rr_AverageAnnualReturnLabel S&P Target Date 2060 Index (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 19.74%
5 Years rr_AverageAnnualReturnYear05 11.04%
10 Years rr_AverageAnnualReturnYear10 804.00%
PFI Prospectus | Principal LifeTime 2060 Fund | Class J  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PLTAX
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.15%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.31%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.66%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.12%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.08%) [38]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.04%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 206
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 348
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 609
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,356
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 106
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 348
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 609
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,356
Label rr_AverageAnnualReturnLabel Class J Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 18.96%
5 Years rr_AverageAnnualReturnYear05 10.99%
10 Years rr_AverageAnnualReturnYear10 7.46%
PFI Prospectus | Principal LifeTime 2060 Fund | Institutional Class  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PLTZX
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.01%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.66%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.67%
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.67%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 68
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 214
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 373
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 835
Annual Return 2014 rr_AnnualReturn2014 6.15%
Annual Return 2015 rr_AnnualReturn2015 (0.80%)
Annual Return 2016 rr_AnnualReturn2016 5.68%
Annual Return 2017 rr_AnnualReturn2017 22.69%
Annual Return 2018 rr_AnnualReturn2018 (9.22%)
Annual Return 2019 rr_AnnualReturn2019 27.52%
Annual Return 2020 rr_AnnualReturn2020 16.60%
Annual Return 2021 rr_AnnualReturn2021 18.15%
Annual Return 2022 rr_AnnualReturn2022 (18.82%)
Annual Return 2023 rr_AnnualReturn2023 20.40%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Highest return for a quarter during the period of the bar chart above:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 20.12%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Lowest return for a quarter during the period of the bar chart above:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (21.80%)
Label rr_AverageAnnualReturnLabel Institutional Class Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 20.40%
5 Years rr_AverageAnnualReturnYear05 11.42%
10 Years rr_AverageAnnualReturnYear10 7.85%
PFI Prospectus | Principal LifeTime 2060 Fund | Institutional Class | After Taxes on Distributions  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Institutional Class Return After Taxes on Distributions
1 Year rr_AverageAnnualReturnYear01 19.17%
5 Years rr_AverageAnnualReturnYear05 9.93%
10 Years rr_AverageAnnualReturnYear10 6.62%
PFI Prospectus | Principal LifeTime 2060 Fund | Institutional Class | After Taxes on Distributions and Sales  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Institutional Class Return After Taxes on Distributions and Sale of Fund Shares
1 Year rr_AverageAnnualReturnYear01 12.81%
5 Years rr_AverageAnnualReturnYear05 8.86%
10 Years rr_AverageAnnualReturnYear10 6.05%
PFI Prospectus | Principal LifeTime 2060 Fund | Class R-1  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PLTRX
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.35%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.54%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.66%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.55%
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.55%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 158
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 490
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 845
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,845
Label rr_AverageAnnualReturnLabel Class R-1 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 19.33%
5 Years rr_AverageAnnualReturnYear05 10.43%
10 Years rr_AverageAnnualReturnYear10 6.91%
PFI Prospectus | Principal LifeTime 2060 Fund | Class R-3  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PLTCX
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.33%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.66%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.24%
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.24%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 126
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 393
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 681
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,500
Label rr_AverageAnnualReturnLabel Class R-3 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 19.72%
5 Years rr_AverageAnnualReturnYear05 10.80%
10 Years rr_AverageAnnualReturnYear10 7.26%
PFI Prospectus | Principal LifeTime 2060 Fund | Class R-4  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PLTMX
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.10%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.29%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.66%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.05%
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.05%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 107
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 334
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 579
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,283
Label rr_AverageAnnualReturnLabel Class R-4 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 19.95%
5 Years rr_AverageAnnualReturnYear05 11.01%
10 Years rr_AverageAnnualReturnYear10 7.46%
PFI Prospectus | Principal LifeTime 2060 Fund | Class R-5  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PLTOX
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.27%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.66%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.93%
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.93%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 95
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 296
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 515
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,143
Label rr_AverageAnnualReturnLabel Class R-5 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 20.06%
5 Years rr_AverageAnnualReturnYear05 11.12%
10 Years rr_AverageAnnualReturnYear10 7.58%
PFI Prospectus | Principal LifeTime 2065 Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading PRINCIPAL LIFETIME 2065 FUND
Objective [Heading] rr_ObjectiveHeading Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The Fund seeks a total return consisting of long-term growth of capital and current income.
Expense [Heading] rr_ExpenseHeading Fees and Expenses of the Fund
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock
This table describes the fees and expenses that you may pay if you buy, hold, and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below.
If you purchase Institutional Class shares through certain programs offered by certain financial intermediaries, you may be required to pay a commission and/or other forms of compensation to the broker, or to your Financial Professional or other financial intermediary.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder Fees (fees paid directly from your investment):
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock
The Fund and each underlying fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs. These costs, which are not reflected in Annual Fund Operating Expenses or in the Example, affect the Fund’s and the underlying fund's performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 13.7% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 13.70%
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock
This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
The Fund operates as a “target date fund” that invests according to an asset allocation strategy designed for investors having a retirement investment goal close to the year in the Fund’s name. The Fund is a fund of funds and invests in underlying funds of Principal Funds, Inc. (“PFI”). Its underlying funds consist of domestic and foreign equity funds, fixed-income funds, real asset funds, and other funds that aim to offer diversification beyond traditional equity and fixed-income securities. The asset class diversification of the Fund is designed to moderate overall price volatility. The Fund may add, remove, or substitute underlying funds at any time.
The Fund is managed with strategic or long-term asset class targets and target ranges. There is a rebalancing strategy that aligns with the target weights to identify asset classes that are either overweight or underweight. The Fund may shift asset class targets in response to normal evaluative processes, the shortening time horizon of the Fund, or changes in market forces or Fund circumstances.
In selecting underlying funds and target weights, the Fund considers both quantitative measures (e.g., past performance, expected levels of risk and returns, expense levels, diversification, and style consistency) and qualitative factors (e.g., organizational stability, investment experience, investment and risk management processes, and information, trading, and compliance systems). There are no minimum or maximum percentages of assets that the Fund must invest in a specific asset class or underlying fund.
The underlying funds invest in growth and value stocks of small, medium, and large market capitalization companies, fixed-income securities, domestic and foreign (including those in emerging markets) securities, securities denominated in foreign currencies, investment companies (including index funds), and derivatives. A derivative is a financial arrangement, the value of which is derived from, or based on, a traditional security, asset, or market index. The underlying funds principally use equity index futures and options in order to gain exposure to a variety of securities or asset classes or attempt to reduce risk.
The Fund’s asset allocation will become more conservative over time as investment goals near (for example, retirement, which is assumed to begin at age 65) and investors become more risk-averse. Approximately 10 years after its target year, the Fund’s underlying fund allocation is expected to match that of the Principal LifeTime Strategic Income Fund. At that time, the Fund may be combined with the Principal LifeTime Strategic Income Fund if the Board of Directors determines that the combination is in the best interests of Fund shareholders. It is expected that at the target date in the Fund’s name, the shareholder will begin gradually withdrawing the account’s value.
LT Glidepath.jpg
Risk [Heading] rr_RiskHeading Principal Risks
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
The following information provides some indication of the risks of investing in the Fund. Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. You may get updated performance information at www.PrincipalAM.com.
The bar chart shows the investment returns of the Fund’s Institutional Class shares for each full calendar year of operations for 10 years (or, if shorter, the life of the Fund). The table shows for the last one, five, and ten calendar year periods (or, if shorter, the life of the Fund), how the Fund’s average annual total returns compare with those of one or more broad measures of market performance.
Life of Fund returns are measured from the date the Fund’s shares were first sold (September 6, 2017).
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following information provides some indication of the risks of investing in the Fund.
Performance Additional Market Index [Text] rr_PerformanceAdditionalMarketIndex The S&P Target Date 2065+ Index is included as an additional index for the Fund as it shows how the Fund’s performance compares with the returns of an index of funds with similar investment objectives.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.PrincipalAM.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.
Bar Chart [Heading] rr_BarChartHeading Total Returns as of December 31
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
Highest return for a quarter during the period of the bar chart above:Q2 202020.50 %
Lowest return for a quarter during the period of the bar chart above:Q1 2020(21.97)%
Performance Table Heading rr_PerformanceTableHeading Average Annual Total ReturnsFor the periods ended December 31, 2023
Performance Table Market Index Changed rr_PerformanceTableMarketIndexChanged Effective March 1, 2024, the Fund changed its primary broad-based index to the S&P 1500 TR in order to meet the revised definition of “broad-based securities market index.”
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are shown for Institutional Class shares only and would be different for the other share classes.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock
After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. After-tax returns are shown for Institutional Class shares only and would be different for the other share classes.
Effective March 1, 2024, the Fund changed its primary broad-based index to the S&P 1500 TR in order to meet the revised definition of “broad-based securities market index.” The S&P Target Date 2065+ Index is included as an additional index for the Fund as it shows how the Fund’s performance compares with the returns of an index of funds with similar investment objectives.
PFI Prospectus | Principal LifeTime 2065 Fund | Risk Lose Money [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Many factors affect that value, and it is possible to lose money by investing in the Fund.
PFI Prospectus | Principal LifeTime 2065 Fund | Risk Not Insured Depository Institution [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
PFI Prospectus | Principal LifeTime 2065 Fund | Counterparty Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Counterparty Risk. Counterparty risk is the risk that the counterparty to a contract or other obligation will be unable or unwilling to honor its obligations.
PFI Prospectus | Principal LifeTime 2065 Fund | Derivatives Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Derivatives Risk. Derivatives may not move in the direction anticipated by the portfolio manager. Transactions in derivatives may increase volatility, cause the liquidation of portfolio positions when not advantageous to do so, and result in disproportionate losses that may be substantially greater than a fund’s initial investment.
•Futures. Futures contracts involve specific risks, including: the imperfect correlation between the change in market value of the instruments held by the Fund and the price of the futures contract; possible lack of a liquid secondary market for a futures contract and the resulting inability to close a futures contract when desired; counterparty risk; and if the Fund has insufficient cash, it may have to sell securities from its portfolio to meet daily variation margin requirements.
•Options. Options involve specific risks, including: the imperfect correlation between the change in market value of the instruments held by the Fund and the price of the options; counterparty risk; difference in trading hours for the options markets and the markets for the underlying securities (rate movements can take place in the underlying markets that cannot be reflected in the options markets); and an insufficient liquid secondary market for particular options.
PFI Prospectus | Principal LifeTime 2065 Fund | Derivatives Risk, Futures Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Futures. Futures contracts involve specific risks, including: the imperfect correlation between the change in market value of the instruments held by the Fund and the price of the futures contract; possible lack of a liquid secondary market for a futures contract and the resulting inability to close a futures contract when desired; counterparty risk; and if the Fund has insufficient cash, it may have to sell securities from its portfolio to meet daily variation margin requirements.
PFI Prospectus | Principal LifeTime 2065 Fund | Derivatives Risk, Options Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Options. Options involve specific risks, including: the imperfect correlation between the change in market value of the instruments held by the Fund and the price of the options; counterparty risk; difference in trading hours for the options markets and the markets for the underlying securities (rate movements can take place in the underlying markets that cannot be reflected in the options markets); and an insufficient liquid secondary market for particular options.
PFI Prospectus | Principal LifeTime 2065 Fund | Emerging Markets Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Emerging Markets Risk. Investments in emerging markets may have more risk than those in developed markets because the emerging markets are less developed and more illiquid. Emerging markets can also be subject to increased social, economic, regulatory, and political uncertainties and can be extremely volatile. The U.S. Securities and Exchange Commission, the U.S. Department of Justice, and other U.S. authorities may be limited in their ability to pursue bad actors in emerging markets, including with respect to fraud.
PFI Prospectus | Principal LifeTime 2065 Fund | Equity Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Equity Securities Risk. A variety of factors can negatively impact the value of equity securities held by a fund, including a decline in the issuer’s financial condition, unfavorable performance of the issuer’s sector or industry, or changes in response to overall market and economic conditions. A fund’s principal market segment(s) (such as market capitalization or style) may underperform other market segments or the equity markets as a whole.
•Growth Style Risk. Growth investing entails the risk that if growth companies do not increase their earnings at a rate expected by investors, the market price of their stock may decline significantly, even if earnings show an absolute increase. Growth company stocks also typically lack the dividend yield that can lessen price declines in market downturns.
•Smaller Companies Risk. Investments in smaller companies may involve greater risk and price volatility than investments in larger, more mature companies. Smaller companies may have limited product lines, markets, or financial resources; lack the competitive strength of larger companies; have less experienced managers; or depend on a few key employees. Their securities often are less widely held and trade less frequently and in lesser quantities, and their market prices often fluctuate more, than securities of larger companies.
•Value Style Risk. Value investing entails the risk that value stocks may continue to be undervalued by the market for extended periods, including the entire period during which the stock is held by a fund, or the events that would cause the stock price to increase may not occur as anticipated or at all. Moreover, a stock that appears to be undervalued actually may be appropriately priced at a low level and, therefore, would not be profitable for the fund.
PFI Prospectus | Principal LifeTime 2065 Fund | Equity Securities Risk, Growth Style Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Growth Style Risk. Growth investing entails the risk that if growth companies do not increase their earnings at a rate expected by investors, the market price of their stock may decline significantly, even if earnings show an absolute increase. Growth company stocks also typically lack the dividend yield that can lessen price declines in market downturns.
PFI Prospectus | Principal LifeTime 2065 Fund | Equity Securities Risk, Smaller Companies Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Smaller Companies Risk. Investments in smaller companies may involve greater risk and price volatility than investments in larger, more mature companies. Smaller companies may have limited product lines, markets, or financial resources; lack the competitive strength of larger companies; have less experienced managers; or depend on a few key employees. Their securities often are less widely held and trade less frequently and in lesser quantities, and their market prices often fluctuate more, than securities of larger companies.
PFI Prospectus | Principal LifeTime 2065 Fund | Equity Securities Risk, Value Style Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Value Style Risk. Value investing entails the risk that value stocks may continue to be undervalued by the market for extended periods, including the entire period during which the stock is held by a fund, or the events that would cause the stock price to increase may not occur as anticipated or at all. Moreover, a stock that appears to be undervalued actually may be appropriately priced at a low level and, therefore, would not be profitable for the fund.
PFI Prospectus | Principal LifeTime 2065 Fund | Fixed-Income Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Fixed-Income Securities Risk. Fixed-income securities are subject to interest rate, credit quality, and liquidity risks. The market value of fixed-income securities generally declines when interest rates rise, and increased interest rates may adversely affect the liquidity of certain fixed-income securities. Moreover, an issuer of fixed-income securities could default on its payment obligations due to increased interest rates or for other reasons.
PFI Prospectus | Principal LifeTime 2065 Fund | Foreign Currency Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Foreign Currency Risk. Risks of investing in securities denominated in, or that trade in, foreign (non-U.S.) currencies include changes in foreign exchange rates and foreign exchange restrictions.
PFI Prospectus | Principal LifeTime 2065 Fund | Foreign Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Foreign Securities Risk. The risks of foreign securities include loss of value as a result of: political or economic instability; nationalization, expropriation, or confiscatory taxation; settlement delays; and limited government regulation (including less stringent reporting, accounting, and disclosure standards than are required of U.S. companies).
PFI Prospectus | Principal LifeTime 2065 Fund | Fund Of Funds Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Fund of Funds Risk. Fund shareholders bear indirectly their proportionate share of the expenses of other investment companies (for example, other mutual funds or exchange-traded funds) in which the Fund invests (“underlying funds”). The Fund’s selection and weighting of asset classes and allocation of investments in underlying funds may cause it to underperform other funds with a similar investment objective. The Fund’s performance and risks correspond directly to the performance and risks of the underlying funds in which it invests, proportionately in accordance with the weightings of such investments, and there is no assurance that the underlying funds will achieve their investment objectives. Management of the Fund entails potential conflicts of interest: the Fund invests in affiliated underlying funds; and PGI and its affiliates may earn different fees from different underlying funds and may have an incentive to allocate more Fund assets to underlying funds from which they receive higher fees.
PFI Prospectus | Principal LifeTime 2065 Fund | Index Fund Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Index Fund Risk. Index funds use a passive investment approach and generally do not attempt to manage market volatility, use defensive strategies, or reduce the effect of any long-term periods of poor investment performance. Therefore, the Fund may hold securities that present risks that an investment advisor researching individual securities might seek to avoid. An index fund has operating and other expenses while an index does not. As a result, over time, index funds tend to underperform the index. The correlation between fund performance and index performance may also be affected by the type of passive investment approach used by a fund (sampling or replication), changes in securities markets, changes in the composition of the index, and the timing of purchases and sales of fund shares. Errors or delays in compiling or rebalancing the Index may impact the performance of the Fund and increase transaction costs.
PFI Prospectus | Principal LifeTime 2065 Fund | Portfolio Duration Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Portfolio Duration Risk. Portfolio duration is a measure of the expected life of a fixed-income security and its sensitivity to changes in interest rates. The longer a fund’s average portfolio duration, the more sensitive the fund will be to changes in interest rates, which means funds with longer average portfolio durations may be more volatile than those with shorter durations.
PFI Prospectus | Principal LifeTime 2065 Fund | Redemption And Large Transaction Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Redemption and Large Transaction Risk. Ownership of the Fund’s shares may be concentrated in one or a few large investors (such as funds of funds, institutional investors, and asset allocation programs) that may redeem or purchase shares in large quantities. These transactions may cause the Fund to sell securities to meet redemptions or to invest additional cash at times it would not otherwise do so, which may result in increased transaction costs, increased expenses, changes to expense ratios, and adverse effects to Fund performance. Such transactions may also accelerate the realization of taxable income if sales of portfolio securities result in gains. Moreover, reallocations by large shareholders among share classes of a fund may result in changes to the expense ratios of affected classes, which may increase the expenses paid by shareholders of the class that experienced the redemption.
PFI Prospectus | Principal LifeTime 2065 Fund | Target Date Fund Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Target Date Fund Risk. A target date fund should not be selected based solely on age or retirement date because there is no guarantee that this Fund will provide adequate income at or through retirement.
PFI Prospectus | Principal LifeTime 2065 Fund | S&P 1500 TR (reflects no deduction for fees, expenses, or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
Label rr_AverageAnnualReturnLabel S&P 1500 TR (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 25.47%
5 Years rr_AverageAnnualReturnYear05 15.39%
Since Inception rr_AverageAnnualReturnSinceInception 1272.00%
PFI Prospectus | Principal LifeTime 2065 Fund | S&P Target Date 2065+ Index (reflects no deduction for fees, expenses, or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
Label rr_AverageAnnualReturnLabel S&P Target Date 2065+ Index (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 19.84%
5 Years rr_AverageAnnualReturnYear05 11.09%
Since Inception rr_AverageAnnualReturnSinceInception 8.61%
PFI Prospectus | Principal LifeTime 2065 Fund | Institutional Class  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PLJIX
Shareholder Fee, Other rr_ShareholderFeeOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.04%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.66%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.70%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 72
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 224
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 390
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 871
Annual Return 2018 rr_AnnualReturn2018 (9.36%)
Annual Return 2019 rr_AnnualReturn2019 27.35%
Annual Return 2020 rr_AnnualReturn2020 16.87%
Annual Return 2021 rr_AnnualReturn2021 18.20%
Annual Return 2022 rr_AnnualReturn2022 (18.83%)
Annual Return 2023 rr_AnnualReturn2023 20.30%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Highest return for a quarter during the period of the bar chart above:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 20.50%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Lowest return for a quarter during the period of the bar chart above:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (21.97%)
Label rr_AverageAnnualReturnLabel Institutional Class Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 20.30%
5 Years rr_AverageAnnualReturnYear05 11.43%
Since Inception rr_AverageAnnualReturnSinceInception 8.54%
PFI Prospectus | Principal LifeTime 2065 Fund | Institutional Class | After Taxes on Distributions  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Institutional Class Return After Taxes on Distributions
1 Year rr_AverageAnnualReturnYear01 19.23%
5 Years rr_AverageAnnualReturnYear05 10.30%
Since Inception rr_AverageAnnualReturnSinceInception 7.40%
PFI Prospectus | Principal LifeTime 2065 Fund | Institutional Class | After Taxes on Distributions and Sales  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Institutional Class Return After Taxes on Distributions and Sale of Fund Shares
1 Year rr_AverageAnnualReturnYear01 12.66%
5 Years rr_AverageAnnualReturnYear05 8.92%
Since Inception rr_AverageAnnualReturnSinceInception 6.54%
PFI Prospectus | Principal LifeTime 2065 Fund | Class R-1  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PLJAX
Shareholder Fee, Other rr_ShareholderFeeOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.35%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.55%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.66%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.56%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 159
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 493
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 850
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,856
Label rr_AverageAnnualReturnLabel Class R-1 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 19.35%
5 Years rr_AverageAnnualReturnYear05 10.53%
Since Inception rr_AverageAnnualReturnSinceInception 7.67%
PFI Prospectus | Principal LifeTime 2065 Fund | Class R-3  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PLJCX
Shareholder Fee, Other rr_ShareholderFeeOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.34%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.66%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.25%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 127
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 397
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 686
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,511
Label rr_AverageAnnualReturnLabel Class R-3 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 19.70%
5 Years rr_AverageAnnualReturnYear05 10.84%
Since Inception rr_AverageAnnualReturnSinceInception 7.98%
PFI Prospectus | Principal LifeTime 2065 Fund | Class R-4  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PLJDX
Shareholder Fee, Other rr_ShareholderFeeOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.10%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.30%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.66%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.06%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 108
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 337
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 585
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,294
Label rr_AverageAnnualReturnLabel Class R-4 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 19.93%
5 Years rr_AverageAnnualReturnYear05 11.05%
Since Inception rr_AverageAnnualReturnSinceInception 8.19%
PFI Prospectus | Principal LifeTime 2065 Fund | Class R-5  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PLJEX
Shareholder Fee, Other rr_ShareholderFeeOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.28%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.66%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.94%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 96
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 300
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 520
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,155
Label rr_AverageAnnualReturnLabel Class R-5 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 20.08%
5 Years rr_AverageAnnualReturnYear05 11.18%
Since Inception rr_AverageAnnualReturnSinceInception 8.33%
PFI Prospectus | Principal LifeTime 2070 Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading PRINCIPAL LIFETIME 2070 FUND
Objective [Heading] rr_ObjectiveHeading Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The Fund seeks a total return consisting of long-term growth of capital and current income.
Expense [Heading] rr_ExpenseHeading Fees and Expenses of the Fund
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock
This table describes the fees and expenses that you may pay if you buy, hold, and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below.
If you purchase Institutional Class shares through certain programs offered by certain financial intermediaries, you may be required to pay a commission and/or other forms of compensation to the broker, or to your Financial Professional or other financial intermediary.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder Fees (fees paid directly from your investment)
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock
The Fund and each underlying fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs. These costs, which are not reflected in Annual Fund Operating Expenses or in the Example, affect the Fund’s and the underlying fund's performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 94.1% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 94.10%
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. The calculation of costs takes into account any applicable contractual fee waivers and/or expense reimbursements for the period noted in the table above. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, No Redemption, By Year, Caption [Text] rr_ExpenseExampleNoRedemptionByYearCaption With respect to Class J shares, you would pay the following expenses if you did not redeem your shares (all other classes would be the same as in the above example):
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
The Fund operates as a “target date fund” that invests according to an asset allocation strategy designed for investors having a retirement investment goal close to the year in the Fund’s name. The Fund is a fund of funds and invests in underlying funds of Principal Funds, Inc. (“PFI”). Its underlying funds consist of domestic and foreign equity funds, fixed-income funds, real asset funds, and other funds that aim to offer diversification beyond traditional equity and fixed-income securities. The asset class diversification of the Fund is designed to moderate overall price volatility. The Fund may add, remove, or substitute underlying funds at any time.
The Fund is managed with strategic or long-term asset class targets and target ranges. There is a rebalancing strategy that aligns with the target weights to identify asset classes that are either overweight or underweight. The Fund may shift asset class targets in response to normal evaluative processes, the shortening time horizon of the Fund, or changes in market forces or Fund circumstances.
In selecting underlying funds and target weights, Principal Global Investors, LLC (“PGI”), the Fund’s investment advisor, considers both quantitative measures (e.g., past performance, expected levels of risk and returns, expense levels, diversification, and style consistency) and qualitative factors (e.g., organizational stability, investment experience, investment and risk management processes, and information, trading, and compliance systems). There are no minimum or maximum percentages of assets that the Fund must invest in a specific asset class or underlying fund.
The underlying funds invest in growth and value stocks of small, medium, and large market capitalization companies, fixed-income securities, domestic and foreign (including those in emerging markets) securities, securities denominated in foreign currencies, investment companies (including index funds), and derivatives. A derivative is a financial arrangement, the value of which is derived from, or based on, a traditional security, asset, or market index. The underlying funds principally use equity index futures and options in order to gain exposure to a variety of securities or asset classes or attempt to reduce risk.
The Fund’s asset allocation will become more conservative over time as investment goals near (for example, retirement, which is assumed to begin at age 65) and investors become more risk-averse. Approximately 10 years after its target year, the Fund’s underlying fund allocation is expected to match that of the Principal LifeTime Strategic Income Fund. At that time, the Fund may be combined with the Principal LifeTime Strategic Income Fund if the Board of Directors determines that the combination is in the best interests of Fund shareholders. It is expected that at the target date in the Fund’s name, the shareholder will begin gradually withdrawing the account’s value.
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Risk [Heading] rr_RiskHeading Principal Risks
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns Performance information provides an indication of the risks of investing in the Fund.
Performance One Year or Less [Text] rr_PerformanceOneYearOrLess No performance information is shown below because the Fund has not yet had a calendar year of performance.
Performance Additional Market Index [Text] rr_PerformanceAdditionalMarketIndex The S&P Target Date 2065+ Index is included as an additional index for the Fund as it shows how the Fund's performance compares with returns of an index of funds with similar investment objectives.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.PrincipalAM.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Past performance is not necessarily an indication of how the Fund will perform in the future.
Performance Table Market Index Changed rr_PerformanceTableMarketIndexChanged Effective March 1, 2024 the Fund changed its primary broad-based index to the S&P 1500 TR in order to meet the revised definition of "broad-based securities market index."
PFI Prospectus | Principal LifeTime 2070 Fund | Risk Lose Money [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Many factors affect that value, and it is possible to lose money by investing in the Fund.
PFI Prospectus | Principal LifeTime 2070 Fund | Risk Not Insured Depository Institution [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
PFI Prospectus | Principal LifeTime 2070 Fund | Counterparty Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Counterparty Risk. Counterparty risk is the risk that the counterparty to a contract or other obligation will be unable or unwilling to honor its obligations.
PFI Prospectus | Principal LifeTime 2070 Fund | Derivatives Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Derivatives Risk. Derivatives may not move in the direction anticipated by the portfolio manager. Transactions in derivatives may increase volatility, cause the liquidation of portfolio positions when not advantageous to do so, and result in disproportionate losses that may be substantially greater than a fund’s initial investment.
•Futures. Futures contracts involve specific risks, including: the imperfect correlation between the change in market value of the instruments held by the Fund and the price of the futures contract; possible lack of a liquid secondary market for a futures contract and the resulting inability to close a futures contract when desired; counterparty risk; and if the Fund has insufficient cash, it may have to sell securities from its portfolio to meet daily variation margin requirements.
•Options. Options involve specific risks, including: the imperfect correlation between the change in market value of the instruments held by the Fund and the price of the options; counterparty risk; difference in trading hours for the options markets and the markets for the underlying securities (rate movements can take place in the underlying markets that cannot be reflected in the options markets); and an insufficient liquid secondary market for particular options.
PFI Prospectus | Principal LifeTime 2070 Fund | Derivatives Risk, Futures Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Futures. Futures contracts involve specific risks, including: the imperfect correlation between the change in market value of the instruments held by the Fund and the price of the futures contract; possible lack of a liquid secondary market for a futures contract and the resulting inability to close a futures contract when desired; counterparty risk; and if the Fund has insufficient cash, it may have to sell securities from its portfolio to meet daily variation margin requirements.
PFI Prospectus | Principal LifeTime 2070 Fund | Derivatives Risk, Options Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Options. Options involve specific risks, including: the imperfect correlation between the change in market value of the instruments held by the Fund and the price of the options; counterparty risk; difference in trading hours for the options markets and the markets for the underlying securities (rate movements can take place in the underlying markets that cannot be reflected in the options markets); and an insufficient liquid secondary market for particular options.
PFI Prospectus | Principal LifeTime 2070 Fund | Emerging Markets Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Emerging Markets Risk. Investments in emerging markets may have more risk than those in developed markets because the emerging markets are less developed and more illiquid. Emerging markets can also be subject to increased social, economic, regulatory, and political uncertainties and can be extremely volatile. The U.S. Securities and Exchange Commission, the U.S. Department of Justice, and other U.S. authorities may be limited in their ability to pursue bad actors in emerging markets, including with respect to fraud.
PFI Prospectus | Principal LifeTime 2070 Fund | Equity Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Equity Securities Risk. A variety of factors can negatively impact the value of equity securities held by a fund, including a decline in the issuer’s financial condition, unfavorable performance of the issuer’s sector or industry, or changes in response to overall market and economic conditions. A fund’s principal market segment(s) (such as market capitalization or style) may underperform other market segments or the equity markets as a whole.
•Growth Style Risk. Growth investing entails the risk that if growth companies do not increase their earnings at a rate expected by investors, the market price of their stock may decline significantly, even if earnings show an absolute increase. Growth company stocks also typically lack the dividend yield that can lessen price declines in market downturns.
•Smaller Companies Risk. Investments in smaller companies may involve greater risk and price volatility than investments in larger, more mature companies. Smaller companies may have limited product lines, markets, or financial resources; lack the competitive strength of larger companies; have less experienced managers; or depend on a few key employees. Their securities often are less widely held and trade less frequently and in lesser quantities, and their market prices often fluctuate more, than securities of larger companies.
•Value Style Risk. Value investing entails the risk that value stocks may continue to be undervalued by the market for extended periods, including the entire period during which the stock is held by a fund, or the events that would cause the stock price to increase may not occur as anticipated or at all. Moreover, a stock that appears to be undervalued actually may be appropriately priced at a low level and, therefore, would not be profitable for the fund.
PFI Prospectus | Principal LifeTime 2070 Fund | Equity Securities Risk, Growth Style Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Growth Style Risk. Growth investing entails the risk that if growth companies do not increase their earnings at a rate expected by investors, the market price of their stock may decline significantly, even if earnings show an absolute increase. Growth company stocks also typically lack the dividend yield that can lessen price declines in market downturns.
PFI Prospectus | Principal LifeTime 2070 Fund | Equity Securities Risk, Smaller Companies Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Smaller Companies Risk. Investments in smaller companies may involve greater risk and price volatility than investments in larger, more mature companies. Smaller companies may have limited product lines, markets, or financial resources; lack the competitive strength of larger companies; have less experienced managers; or depend on a few key employees. Their securities often are less widely held and trade less frequently and in lesser quantities, and their market prices often fluctuate more, than securities of larger companies.
PFI Prospectus | Principal LifeTime 2070 Fund | Equity Securities Risk, Value Style Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Value Style Risk. Value investing entails the risk that value stocks may continue to be undervalued by the market for extended periods, including the entire period during which the stock is held by a fund, or the events that would cause the stock price to increase may not occur as anticipated or at all. Moreover, a stock that appears to be undervalued actually may be appropriately priced at a low level and, therefore, would not be profitable for the fund.
PFI Prospectus | Principal LifeTime 2070 Fund | Fixed-Income Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Fixed-Income Securities Risk. Fixed-income securities are subject to interest rate, credit quality, and liquidity risks. The market value of fixed-income securities generally declines when interest rates rise, and increased interest rates may adversely affect the liquidity of certain fixed-income securities. Moreover, an issuer of fixed-income securities could default on its payment obligations due to increased interest rates or for other reasons.
PFI Prospectus | Principal LifeTime 2070 Fund | Foreign Currency Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Foreign Currency Risk. Risks of investing in securities denominated in, or that trade in, foreign (non-U.S.) currencies include changes in foreign exchange rates and foreign exchange restrictions.
PFI Prospectus | Principal LifeTime 2070 Fund | Foreign Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Foreign Securities Risk. The risks of foreign securities include loss of value as a result of: political or economic instability; nationalization, expropriation, or confiscatory taxation; settlement delays; and limited government regulation (including less stringent reporting, accounting, and disclosure standards than are required of U.S. companies).
PFI Prospectus | Principal LifeTime 2070 Fund | Fund Of Funds Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Fund of Funds Risk. Fund shareholders bear indirectly their proportionate share of the expenses of other investment companies (for example, other mutual funds or exchange-traded funds) in which the Fund invests (“underlying funds”). The Fund’s selection and weighting of asset classes and allocation of investments in underlying funds may cause it to underperform other funds with a similar investment objective. The Fund’s performance and risks correspond directly to the performance and risks of the underlying funds in which it invests, proportionately in accordance with the weightings of such investments, and there is no assurance that the underlying funds will achieve their investment objectives. Management of the Fund entails potential conflicts of interest: the Fund invests in affiliated underlying funds; and PGI and its affiliates may earn different fees from different underlying funds and may have an incentive to allocate more Fund assets to underlying funds from which they receive higher fees.
PFI Prospectus | Principal LifeTime 2070 Fund | Index Fund Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Index Fund Risk. Index funds use a passive investment approach and generally do not attempt to manage market volatility, use defensive strategies, or reduce the effect of any long-term periods of poor investment performance. Therefore, the Fund may hold securities that present risks that an investment advisor researching individual securities might seek to avoid. An index fund has operating and other expenses while an index does not. As a result, over time, index funds tend to underperform the index. The correlation between fund performance and index performance may also be affected by the type of passive investment approach used by a fund (sampling or replication), changes in securities markets, changes in the composition of the index, and the timing of purchases and sales of fund shares. Errors or delays in compiling or rebalancing the Index may impact the performance of the Fund and increase transaction costs.
PFI Prospectus | Principal LifeTime 2070 Fund | Portfolio Duration Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Portfolio Duration Risk. Portfolio duration is a measure of the expected life of a fixed-income security and its sensitivity to changes in interest rates. The longer a fund’s average portfolio duration, the more sensitive the fund will be to changes in interest rates, which means funds with longer average portfolio durations may be more volatile than those with shorter durations.
PFI Prospectus | Principal LifeTime 2070 Fund | Redemption And Large Transaction Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Redemption and Large Transaction Risk. Ownership of the Fund’s shares may be concentrated in one or a few large investors (such as funds of funds, institutional investors, and asset allocation programs) that may redeem or purchase shares in large quantities. These transactions may cause the Fund to sell securities to meet redemptions or to invest additional cash at times it would not otherwise do so, which may result in increased transaction costs, increased expenses, changes to expense ratios, and adverse effects to Fund performance. Such transactions may also accelerate the realization of taxable income if sales of portfolio securities result in gains. Moreover, reallocations by large shareholders among share classes of a fund may result in changes to the expense ratios of affected classes, which may increase the expenses paid by shareholders of the class that experienced the redemption.
PFI Prospectus | Principal LifeTime 2070 Fund | Target Date Fund Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Target Date Fund Risk. A target date fund should not be selected based solely on age or retirement date because there is no guarantee that this Fund will provide adequate income at or through retirement.
PFI Prospectus | Principal LifeTime 2070 Fund | Class J  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PLTLX
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.15%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 62.50%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.67%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 63.32%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (62.35%) [39]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.97%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 199
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 6,710
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 7,859
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 8,097
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 99
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 6,710
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 7,859
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 8,097
PFI Prospectus | Principal LifeTime 2070 Fund | Institutional Class  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PLTGX
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 1.53%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.67%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 2.20%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (1.48%) [39]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.72%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 74
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 545
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,044
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 2,418
PFI Prospectus | Principal LifeTime 2070 Fund | Class R-1  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PLTSX
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.35%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 3.74%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.67%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 4.76%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (3.16%) [39]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.60%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 163
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 1,149
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 2,141
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 4,641
PFI Prospectus | Principal LifeTime 2070 Fund | Class R-3  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PLTDX
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 3.12%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.67%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 4.04%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (2.75%) [39]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.29%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 131
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 977
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,840
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 4,069
PFI Prospectus | Principal LifeTime 2070 Fund | Class R-4  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PLTBX
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.10%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 7.56%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.67%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 8.33%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (7.23%) [39]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.10%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 112
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 1,786
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 3,350
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 6,827
PFI Prospectus | Principal LifeTime 2070 Fund | Class R-5  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PLTFX
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 3.56%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.67%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 4.23%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (3.25%) [39]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.98%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 100
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 987
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,887
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 4,200
PFI Prospectus | Principal LifeTime Hybrid Income Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading PRINCIPAL LIFETIME HYBRID INCOME FUND
Objective [Heading] rr_ObjectiveHeading Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The Fund seeks current income,
Objective, Secondary [Text Block] rr_ObjectiveSecondaryTextBlock and as a secondary objective, capital appreciation.
Expense [Heading] rr_ExpenseHeading Fees and Expenses of the Fund
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock
This table describes the fees and expenses that you may pay if you buy, hold, and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below.
If you purchase Institutional Class or Class R-6 shares through certain programs offered by certain financial intermediaries, you may be required to pay a commission and/or other forms of compensation to the broker, or to your Financial Professional or other financial intermediary.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder Fees (fees paid directly from your investment)
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination February 28, 2025
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock
The Fund and each underlying fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs. These costs, which are not reflected in Annual Fund Operating Expenses or in the Example, affect the Fund’s and the underlying funds' performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 20.7% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 20.70%
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. The calculation of costs takes into account any applicable contractual fee waivers and/or expense reimbursements for the period noted in the table above. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, No Redemption, By Year, Caption [Text] rr_ExpenseExampleNoRedemptionByYearCaption With respect to Class J shares, you would pay the following expenses if you did not redeem your shares (all other classes would be the same as in the above example):
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
The Fund invests according to an asset allocation strategy designed for investors primarily seeking current income and secondarily capital appreciation. The Fund’s asset allocation is designed for investors who are approximately 10 years beyond the normal retirement age of 65. The Fund is a fund of funds that invests in underlying funds of Principal Funds, Inc. (“PFI”), with a majority of the Fund’s assets invested in index funds. Its underlying funds consist of domestic and foreign equity funds, fixed-income funds, real asset funds, and other funds that aim to offer diversification beyond traditional equity and fixed-income securities. The diversification of the Fund is designed to moderate overall price volatility. The Fund may add, remove, or substitute underlying funds at any time.
The Fund is managed with strategic or long-term asset class targets and target ranges. There is a rebalancing strategy that aligns with the target weights to identify asset classes that are either overweight or underweight. The Fund may shift asset class targets in response to normal evaluative processes, the shortening time horizon of the Fund, or changes in market forces or Fund circumstances.
In selecting underlying funds and target weights, the Fund considers both quantitative measures (e.g., past performance, expected levels of risk and returns, expense levels, diversification, and style consistency) and qualitative factors (e.g., organizational stability, investment experience, investment and risk management processes, and information, trading, and compliance systems). There are no minimum or maximum percentages of assets that the Fund must invest in a specific asset class or underlying fund.
The underlying funds invest in growth and value stocks of large market capitalization companies, fixed-income securities, domestic and foreign securities, securities denominated in foreign currencies, investment companies (including index funds), securitized products, U.S. government and U.S. government-sponsored securities, and derivatives. A derivative is a financial arrangement, the value of which is derived from, or based on, a traditional security, asset, or market index. The underlying funds principally use futures, options, swaps (including, for example, credit default, interest rate, and currency swaps), and forwards in order to gain exposure to a variety of securities or asset classes or attempt to reduce risk.
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Risk [Heading] rr_RiskHeading Principal Risks
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
The following information provides some indication of the risks of investing in the Fund. Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. You may get updated performance information at www.PrincipalAM.com.
The bar chart shows the investment returns of the Fund’s Institutional Class shares for each full calendar year of operations for 10 years (or, if shorter, the life of the Fund). The table shows for the last one, five, and ten calendar year periods (or, if shorter, the life of the Fund), how the Fund’s average annual total returns compare with those of one or more broad measures of market performance.
Life of Fund returns are measured from the date the Fund’s shares were first sold (September 30, 2014).
For periods prior to the inception date of Class R-6 shares (August 24, 2015) and Class J shares (March 1, 2018), the performance shown in the table for these newer classes is that of the Fund’s Institutional Class shares, adjusted to reflect the respective fees and expenses of each class. These adjustments result in performance for such periods that is no higher than the historical performance of the Institutional Class shares, which were first sold on September 30, 2014.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following information provides some indication of the risks of investing in the Fund.
Performance Additional Market Index [Text] rr_PerformanceAdditionalMarketIndex The S&P Target Date Retirement Income Index is included as an additional index for the Fund as it shows how the Fund’s performance compares with the returns of an index of funds with similar investment objectives.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.PrincipalAM.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.
Bar Chart [Heading] rr_BarChartHeading Total Returns as of December 31
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
Highest return for a quarter during the period of the bar chart above:Q2 20207.43 %
Lowest return for a quarter during the period of the bar chart above:Q2 2022(8.44)%
Performance Table Heading rr_PerformanceTableHeading Average Annual Total ReturnsFor the periods ended December 31, 2023
Performance Table Market Index Changed rr_PerformanceTableMarketIndexChanged Effective March 1, 2024, the Fund changed its primary broad-based index to the Bloomberg U.S. Aggregate Bond Index in order to meet the revised definition of “broad-based securities market index.”
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are shown for Institutional Class shares only and would be different for the other share classes.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock
After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. After-tax returns are shown for Institutional Class shares only and would be different for the other share classes.
Effective March 1, 2024, the Fund changed its primary broad-based index to the Bloomberg U.S. Aggregate Bond Index in order to meet the revised definition of “broad-based securities market index.” The S&P Target Date Retirement Income Index is included as an additional index for the Fund as it shows how the Fund’s performance compares with the returns of an index of funds with similar investment objectives.
PFI Prospectus | Principal LifeTime Hybrid Income Fund | Risk Lose Money [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Many factors affect that value, and it is possible to lose money by investing in the Fund.
PFI Prospectus | Principal LifeTime Hybrid Income Fund | Risk Not Insured Depository Institution [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
PFI Prospectus | Principal LifeTime Hybrid Income Fund | Counterparty Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Counterparty Risk. Counterparty risk is the risk that the counterparty to a contract or other obligation will be unable or unwilling to honor its obligations.
PFI Prospectus | Principal LifeTime Hybrid Income Fund | Derivatives Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Derivatives Risk. Derivatives may not move in the direction anticipated by the portfolio manager. Transactions in derivatives may increase volatility, cause the liquidation of portfolio positions when not advantageous to do so, and result in disproportionate losses that may be substantially greater than a fund’s initial investment.
•Credit Default Swaps. Credit default swaps involve special risks in addition to those associated with swaps generally because they are difficult to value, are highly susceptible to liquidity and credit risk, and generally pay a return to the party that has paid the premium only in the event of an actual default by the issuer of the underlying obligation (as opposed to a credit downgrade or other indication of financial difficulty). The protection “buyer” in a credit default contract may be obligated to pay the protection “seller” an up-front payment or a periodic stream of payments over the term of the contract, provided, generally, that no credit event on a reference obligation has occurred. If a credit event occurs, the seller generally must pay the buyer the “par value” (i.e., full notional value) of the swap in exchange for an equal face amount of deliverable obligations of the reference entity described in the swap, or the seller may be required to deliver the related net cash amount, if the swap is cash settled. The Fund may be either the buyer or seller in the transaction.
•Forward Contracts, Futures, and Swaps. Forward contracts, futures, and swaps involve specific risks, including: the imperfect correlation between the change in market value of the instruments held by the fund and the price of the forward contract, future, or swap; possible lack of a liquid secondary market for a forward contract, future, or swap and the resulting inability to close a forward contract, future, or swap when desired; counterparty risk; and if the fund has insufficient cash, it may have to sell securities from its portfolio to meet daily variation margin requirements.
•Options. Options involve specific risks, including: the imperfect correlation between the change in market value of the instruments held by the Fund and the price of the options; counterparty risk; difference in trading hours for the options markets and the markets for the underlying securities (rate movements can take place in the underlying markets that cannot be reflected in the options markets); and an insufficient liquid secondary market for particular options.
PFI Prospectus | Principal LifeTime Hybrid Income Fund | Derivatives Risk, Credit Default Swaps Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Credit Default Swaps. Credit default swaps involve special risks in addition to those associated with swaps generally because they are difficult to value, are highly susceptible to liquidity and credit risk, and generally pay a return to the party that has paid the premium only in the event of an actual default by the issuer of the underlying obligation (as opposed to a credit downgrade or other indication of financial difficulty). The protection “buyer” in a credit default contract may be obligated to pay the protection “seller” an up-front payment or a periodic stream of payments over the term of the contract, provided, generally, that no credit event on a reference obligation has occurred. If a credit event occurs, the seller generally must pay the buyer the “par value” (i.e., full notional value) of the swap in exchange for an equal face amount of deliverable obligations of the reference entity described in the swap, or the seller may be required to deliver the related net cash amount, if the swap is cash settled. The Fund may be either the buyer or seller in the transaction.
PFI Prospectus | Principal LifeTime Hybrid Income Fund | Derivatives Risk, Forward Contracts, Futures, And Swaps Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Forward Contracts, Futures, and Swaps. Forward contracts, futures, and swaps involve specific risks, including: the imperfect correlation between the change in market value of the instruments held by the fund and the price of the forward contract, future, or swap; possible lack of a liquid secondary market for a forward contract, future, or swap and the resulting inability to close a forward contract, future, or swap when desired; counterparty risk; and if the fund has insufficient cash, it may have to sell securities from its portfolio to meet daily variation margin requirements.
PFI Prospectus | Principal LifeTime Hybrid Income Fund | Derivatives Risk, Options Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Options. Options involve specific risks, including: the imperfect correlation between the change in market value of the instruments held by the Fund and the price of the options; counterparty risk; difference in trading hours for the options markets and the markets for the underlying securities (rate movements can take place in the underlying markets that cannot be reflected in the options markets); and an insufficient liquid secondary market for particular options.
PFI Prospectus | Principal LifeTime Hybrid Income Fund | Equity Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Equity Securities Risk. A variety of factors can negatively impact the value of equity securities held by a fund, including a decline in the issuer’s financial condition, unfavorable performance of the issuer’s sector or industry, or changes in response to overall market and economic conditions. A fund’s principal market segment(s) (such as market capitalization or style) may underperform other market segments or the equity markets as a whole.
•Growth Style Risk. Growth investing entails the risk that if growth companies do not increase their earnings at a rate expected by investors, the market price of their stock may decline significantly, even if earnings show an absolute increase. Growth company stocks also typically lack the dividend yield that can lessen price declines in market downturns.
•Value Style Risk. Value investing entails the risk that value stocks may continue to be undervalued by the market for extended periods, including the entire period during which the stock is held by a fund, or the events that would cause the stock price to increase may not occur as anticipated or at all. Moreover, a stock that appears to be undervalued actually may be appropriately priced at a low level and, therefore, would not be profitable for the fund.
PFI Prospectus | Principal LifeTime Hybrid Income Fund | Equity Securities Risk, Growth Style Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Growth Style Risk. Growth investing entails the risk that if growth companies do not increase their earnings at a rate expected by investors, the market price of their stock may decline significantly, even if earnings show an absolute increase. Growth company stocks also typically lack the dividend yield that can lessen price declines in market downturns.
PFI Prospectus | Principal LifeTime Hybrid Income Fund | Equity Securities Risk, Value Style Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Value Style Risk. Value investing entails the risk that value stocks may continue to be undervalued by the market for extended periods, including the entire period during which the stock is held by a fund, or the events that would cause the stock price to increase may not occur as anticipated or at all. Moreover, a stock that appears to be undervalued actually may be appropriately priced at a low level and, therefore, would not be profitable for the fund.
PFI Prospectus | Principal LifeTime Hybrid Income Fund | Fixed-Income Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Fixed-Income Securities Risk. Fixed-income securities are subject to interest rate, credit quality, and liquidity risks. The market value of fixed-income securities generally declines when interest rates rise, and increased interest rates may adversely affect the liquidity of certain fixed-income securities. Moreover, an issuer of fixed-income securities could default on its payment obligations due to increased interest rates or for other reasons.
PFI Prospectus | Principal LifeTime Hybrid Income Fund | Foreign Currency Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Foreign Currency Risk. Risks of investing in securities denominated in, or that trade in, foreign (non-U.S.) currencies include changes in foreign exchange rates and foreign exchange restrictions.
PFI Prospectus | Principal LifeTime Hybrid Income Fund | Foreign Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Foreign Securities Risk. The risks of foreign securities include loss of value as a result of: political or economic instability; nationalization, expropriation, or confiscatory taxation; settlement delays; and limited government regulation (including less stringent reporting, accounting, and disclosure standards than are required of U.S. companies).
PFI Prospectus | Principal LifeTime Hybrid Income Fund | Fund Of Funds Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Fund of Funds Risk. Fund shareholders bear indirectly their proportionate share of the expenses of other investment companies (for example, other mutual funds or exchange-traded funds) in which the Fund invests (“underlying funds”). The Fund’s selection and weighting of asset classes and allocation of investments in underlying funds may cause it to underperform other funds with a similar investment objective. The Fund’s performance and risks correspond directly to the performance and risks of the underlying funds in which it invests, proportionately in accordance with the weightings of such investments, and there is no assurance that the underlying funds will achieve their investment objectives. Management of the Fund entails potential conflicts of interest: the Fund invests in affiliated underlying funds; and PGI and its affiliates may earn different fees from different underlying funds and may have an incentive to allocate more Fund assets to underlying funds from which they receive higher fees.
PFI Prospectus | Principal LifeTime Hybrid Income Fund | Index Fund Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Index Fund Risk. Index funds use a passive investment approach and generally do not attempt to manage market volatility, use defensive strategies, or reduce the effect of any long-term periods of poor investment performance. Therefore, the Fund may hold securities that present risks that an investment advisor researching individual securities might seek to avoid. An index fund has operating and other expenses while an index does not. As a result, over time, index funds tend to underperform the index. The correlation between fund performance and index performance may also be affected by the type of passive investment approach used by a fund (sampling or replication), changes in securities markets, changes in the composition of the index, and the timing of purchases and sales of fund shares. Errors or delays in compiling or rebalancing the Index may impact the performance of the Fund and increase transaction costs.
PFI Prospectus | Principal LifeTime Hybrid Income Fund | Portfolio Duration Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Portfolio Duration Risk. Portfolio duration is a measure of the expected life of a fixed-income security and its sensitivity to changes in interest rates. The longer a fund’s average portfolio duration, the more sensitive the fund will be to changes in interest rates, which means funds with longer average portfolio durations may be more volatile than those with shorter durations.
PFI Prospectus | Principal LifeTime Hybrid Income Fund | Redemption And Large Transaction Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Redemption and Large Transaction Risk. Ownership of the Fund’s shares may be concentrated in one or a few large investors (such as funds of funds, institutional investors, and asset allocation programs) that may redeem or purchase shares in large quantities. These transactions may cause the Fund to sell securities to meet redemptions or to invest additional cash at times it would not otherwise do so, which may result in increased transaction costs, increased expenses, changes to expense ratios, and adverse effects to Fund performance. Such transactions may also accelerate the realization of taxable income if sales of portfolio securities result in gains. Moreover, reallocations by large shareholders among share classes of a fund may result in changes to the expense ratios of affected classes, which may increase the expenses paid by shareholders of the class that experienced the redemption.
PFI Prospectus | Principal LifeTime Hybrid Income Fund | Securitized Products Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Securitized Products Risk. Investments in securitized products are subject to risks similar to traditional fixed-income securities, such as credit, interest rate, liquidity, prepayment, extension, and default risk, as well as additional risks associated with the nature of the assets and the servicing of those assets. Unscheduled prepayments on securitized products may have to be reinvested at lower rates. A reduction in prepayments may increase the effective maturities of these securities, exposing them to the risk of decline in market value over time (extension risk).
PFI Prospectus | Principal LifeTime Hybrid Income Fund | Target Date Fund Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Target Date Fund Risk. A target date fund should not be selected based solely on age or retirement date because there is no guarantee that this Fund will provide adequate income at or through retirement.
PFI Prospectus | Principal LifeTime Hybrid Income Fund | U.S. Government Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
U.S. Government Securities Risk. Yields available from U.S. government securities are generally lower than yields from many other fixed-income securities. The value of U.S. government securities may be adversely impacted by changes in interest rates, changes in the credit rating of the U.S. government, or a default by the U.S. government.
PFI Prospectus | Principal LifeTime Hybrid Income Fund | U.S. Government-Sponsored Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
U.S. Government-Sponsored Securities Risk. Securities issued by U.S. government-sponsored enterprises such as the Federal Home Loan Mortgage Corporation, the Federal National Mortgage Association, and the Federal Home Loan Banks are not issued or guaranteed by the U.S. government.
PFI Prospectus | Principal LifeTime Hybrid Income Fund | Bloomberg U.S. Aggregate Bond Index (reflects no deduction for fees, expenses, or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
Label rr_AverageAnnualReturnLabel Bloomberg U.S. Aggregate Bond Index (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 5.53%
5 Years rr_AverageAnnualReturnYear05 1.10%
Since Inception rr_AverageAnnualReturnSinceInception 1.51%
PFI Prospectus | Principal LifeTime Hybrid Income Fund | S&P Target Date Retirement Income Index (reflects no deduction for fees, expenses, or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
Label rr_AverageAnnualReturnLabel S&P Target Date Retirement Income Index (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 10.35%
5 Years rr_AverageAnnualReturnYear05 4.90%
Since Inception rr_AverageAnnualReturnSinceInception 3.93%
PFI Prospectus | Principal LifeTime Hybrid Income Fund | Class J  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PHJFX
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.15%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.04%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.32%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.51%
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.51%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 152
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 164
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 285
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 640
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 52
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 164
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 285
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 640
Label rr_AverageAnnualReturnLabel Class J Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 9.62%
5 Years rr_AverageAnnualReturnYear05 4.25%
Since Inception rr_AverageAnnualReturnSinceInception 3.33%
PFI Prospectus | Principal LifeTime Hybrid Income Fund | Institutional Class  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PHTFX
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.22%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.32%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.54%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.17%) [40]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.37%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 38
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 156
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 285
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 661
Annual Return 2015 rr_AnnualReturn2015 (0.05%)
Annual Return 2016 rr_AnnualReturn2016 4.69%
Annual Return 2017 rr_AnnualReturn2017 7.62%
Annual Return 2018 rr_AnnualReturn2018 (2.75%)
Annual Return 2019 rr_AnnualReturn2019 11.82%
Annual Return 2020 rr_AnnualReturn2020 10.11%
Annual Return 2021 rr_AnnualReturn2021 5.15%
Annual Return 2022 rr_AnnualReturn2022 (13.20%)
Annual Return 2023 rr_AnnualReturn2023 10.77%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Highest return for a quarter during the period of the bar chart above:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 7.43%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Lowest return for a quarter during the period of the bar chart above:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Jun. 30, 2022
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (8.44%)
Label rr_AverageAnnualReturnLabel Institutional Class Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 10.77%
5 Years rr_AverageAnnualReturnYear05 4.48%
Since Inception rr_AverageAnnualReturnSinceInception 3.56%
PFI Prospectus | Principal LifeTime Hybrid Income Fund | Institutional Class | After Taxes on Distributions  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Institutional Class Return After Taxes on Distributions
1 Year rr_AverageAnnualReturnYear01 9.38%
5 Years rr_AverageAnnualReturnYear05 2.98%
Since Inception rr_AverageAnnualReturnSinceInception 2.27%
PFI Prospectus | Principal LifeTime Hybrid Income Fund | Institutional Class | After Taxes on Distributions and Sales  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Institutional Class Return After Taxes on Distributions and Sale of Fund Shares
1 Year rr_AverageAnnualReturnYear01 6.56%
5 Years rr_AverageAnnualReturnYear05 3.02%
Since Inception rr_AverageAnnualReturnSinceInception 2.31%
PFI Prospectus | Principal LifeTime Hybrid Income Fund | Class R-6  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PLTYX
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.09%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.32%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.41%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.07%) [40]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.34%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 35
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 125
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 223
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 511
Label rr_AverageAnnualReturnLabel Class R-6 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 10.78%
5 Years rr_AverageAnnualReturnYear05 4.51%
Since Inception rr_AverageAnnualReturnSinceInception 3.59%
PFI Prospectus | Principal LifeTime Hybrid 2015 Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading PRINCIPAL LIFETIME HYBRID 2015 FUND
Objective [Heading] rr_ObjectiveHeading Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The Fund seeks a total return consisting of long-term growth of capital and current income.
Expense [Heading] rr_ExpenseHeading Fees and Expenses of the Fund
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock
This table describes the fees and expenses that you may pay if you buy, hold, and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below.
If you purchase Institutional Class or Class R-6 shares through certain programs offered by certain financial intermediaries, you may be required to pay a commission and/or other forms of compensation to the broker, or to your Financial Professional or other financial intermediary.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder Fees (fees paid directly from your investment)
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination February 28, 2025
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock
The Fund and each underlying fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs. These costs, which are not reflected in Annual Fund Operating Expenses or in the Example, affect the Fund’s and the underlying funds' performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 15.8% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 15.80%
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. The calculation of costs takes into account any applicable contractual fee waivers and/or expense reimbursements for the period noted in the table above. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, No Redemption, By Year, Caption [Text] rr_ExpenseExampleNoRedemptionByYearCaption With respect to Class J shares, you would pay the following expenses if you did not redeem your shares (all other classes would be the same as in the above example):
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
The Fund operates as a “target date fund” that invests according to an asset allocation strategy designed for investors having a retirement investment goal close to the year in the Fund’s name. The Fund is a fund of funds that invests in underlying funds of Principal Funds, Inc. (“PFI”), with a majority of the Fund’s assets invested in index funds. Its underlying funds consist of domestic and foreign equity funds, fixed-income funds, real asset funds, and other funds that aim to offer diversification beyond traditional equity and fixed-income securities. The asset class diversification of the Fund is designed to moderate overall price volatility. The Fund may add, remove, or substitute underlying funds at any time.
The Fund is managed with strategic or long-term asset class targets and target ranges. There is a rebalancing strategy that aligns with the target weights to identify asset classes that are either overweight or underweight. The Fund may shift asset class targets in response to normal evaluative processes, the shortening time horizon of the Fund, or changes in market forces or Fund circumstances.
In selecting underlying funds and target weights, the Fund considers both quantitative measures (e.g., past performance, expected levels of risk and returns, expense levels, diversification, and style consistency) and qualitative factors (e.g., organizational stability, investment experience, investment and risk management processes, and information, trading, and compliance systems). There are no minimum or maximum percentages of assets that the Fund must invest in a specific asset class or underlying fund.
The underlying funds invest in growth and value stocks of small, medium, and large market capitalization companies, fixed-income securities, domestic and foreign securities, securities denominated in foreign currencies, investment companies (including index funds), securitized products, U.S. government and U.S. government-sponsored securities, and derivatives. A derivative is a financial arrangement, the value of which is derived from, or based on, a traditional security, asset, or market index. The underlying funds principally use futures, options, swaps (including, for example, credit default, interest rate, and currency swaps), and forwards in order to gain exposure to a variety of securities or asset classes or attempt to reduce risk.
The Fund’s asset allocation will become more conservative over time as investment goals near (for example, retirement, which is assumed to begin at age 65) and investors become more risk-averse. Approximately 10 years after its target year, the Fund’s underlying fund allocation is expected to match that of the Principal LifeTime Hybrid Income Fund. At that time, the Fund may be combined with the Principal LifeTime Hybrid Income Fund if the Board of Directors determines that the combination is in the best interests of Fund shareholders. It is expected that at the target date in the Fund’s name, the shareholder will begin gradually withdrawing the account’s value.
LT Hybrid Glidepath.jpg
Risk [Heading] rr_RiskHeading Principal Risks
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
The following information provides some indication of the risks of investing in the Fund. Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. You may get updated performance information at www.PrincipalAM.com.
The bar chart shows the investment returns of the Fund’s Institutional Class shares for each full calendar year of operations for 10 years (or, if shorter, the life of the Fund). The table shows for the last one, five, and ten calendar year periods (or, if shorter, the life of the Fund), how the Fund’s average annual total returns compare with those of one or more broad measures of market performance.
Life of Fund returns are measured from the date the Fund’s shares were first sold (September 30, 2014).
For periods prior to the inception date of Class R-6 shares (August 24, 2015) and Class J shares (March 1, 2018), the performance shown in the table for these newer classes is that of the Fund’s Institutional Class shares, adjusted to reflect the respective fees and expenses of each class. These adjustments result in performance for such periods that is no higher than the historical performance of the Institutional Class shares, which were first sold on September 30, 2014.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following information provides some indication of the risks of investing in the Fund.
Performance Additional Market Index [Text] rr_PerformanceAdditionalMarketIndex The S&P Target Date 2015 Index is included as an additional index for the Fund as it shows how the Fund’s performance compares with the returns of an index of funds with similar investment objectives.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.PrincipalAM.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.
Bar Chart [Heading] rr_BarChartHeading Total Returns as of December 31
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
Highest return for a quarter during the period of the bar chart above:Q2 20209.79 %
Lowest return for a quarter during the period of the bar chart above:Q2 2022(8.93)%
Performance Table Heading rr_PerformanceTableHeading Average Annual Total ReturnsFor the periods ended December 31, 2023
Performance Table Market Index Changed rr_PerformanceTableMarketIndexChanged Effective March 1, 2024, the Fund changed its primary broad-based index to the Bloomberg U.S. Aggregate Bond Index in order to meet the revised definition of “broad-based securities market index.”
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are shown for Institutional Class shares only and would be different for the other share classes.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock
After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. After-tax returns are shown for Institutional Class shares only and would be different for the other share classes.
Effective March 1, 2024, the Fund changed its primary broad-based index to the Bloomberg U.S. Aggregate Bond Index in order to meet the revised definition of “broad-based securities market index.” The S&P Target Date 2015 Index is included as an additional index for the Fund as it shows how the Fund’s performance compares with the returns of an index of funds with similar investment objectives.
PFI Prospectus | Principal LifeTime Hybrid 2015 Fund | Risk Lose Money [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Many factors affect that value, and it is possible to lose money by investing in the Fund.
PFI Prospectus | Principal LifeTime Hybrid 2015 Fund | Risk Not Insured Depository Institution [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
PFI Prospectus | Principal LifeTime Hybrid 2015 Fund | Counterparty Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Counterparty Risk. Counterparty risk is the risk that the counterparty to a contract or other obligation will be unable or unwilling to honor its obligations.
PFI Prospectus | Principal LifeTime Hybrid 2015 Fund | Derivatives Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Derivatives Risk. Derivatives may not move in the direction anticipated by the portfolio manager. Transactions in derivatives may increase volatility, cause the liquidation of portfolio positions when not advantageous to do so, and result in disproportionate losses that may be substantially greater than a fund’s initial investment.
•Credit Default Swaps. Credit default swaps involve special risks in addition to those associated with swaps generally because they are difficult to value, are highly susceptible to liquidity and credit risk, and generally pay a return to the party that has paid the premium only in the event of an actual default by the issuer of the underlying obligation (as opposed to a credit downgrade or other indication of financial difficulty). The protection “buyer” in a credit default contract may be obligated to pay the protection “seller” an up-front payment or a periodic stream of payments over the term of the contract, provided, generally, that no credit event on a reference obligation has occurred. If a credit event occurs, the seller generally must pay the buyer the “par value” (i.e., full notional value) of the swap in exchange for an equal face amount of deliverable obligations of the reference entity described in the swap, or the seller may be required to deliver the related net cash amount, if the swap is cash settled. The Fund may be either the buyer or seller in the transaction.
•Forward Contracts, Futures, and Swaps. Forward contracts, futures, and swaps involve specific risks, including: the imperfect correlation between the change in market value of the instruments held by the fund and the price of the forward contract, future, or swap; possible lack of a liquid secondary market for a forward contract, future, or swap and the resulting inability to close a forward contract, future, or swap when desired; counterparty risk; and if the fund has insufficient cash, it may have to sell securities from its portfolio to meet daily variation margin requirements.
•Options. Options involve specific risks, including: the imperfect correlation between the change in market value of the instruments held by the Fund and the price of the options; counterparty risk; difference in trading hours for the options markets and the markets for the underlying securities (rate movements can take place in the underlying markets that cannot be reflected in the options markets); and an insufficient liquid secondary market for particular options.
PFI Prospectus | Principal LifeTime Hybrid 2015 Fund | Derivatives Risk, Credit Default Swaps Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Credit Default Swaps. Credit default swaps involve special risks in addition to those associated with swaps generally because they are difficult to value, are highly susceptible to liquidity and credit risk, and generally pay a return to the party that has paid the premium only in the event of an actual default by the issuer of the underlying obligation (as opposed to a credit downgrade or other indication of financial difficulty). The protection “buyer” in a credit default contract may be obligated to pay the protection “seller” an up-front payment or a periodic stream of payments over the term of the contract, provided, generally, that no credit event on a reference obligation has occurred. If a credit event occurs, the seller generally must pay the buyer the “par value” (i.e., full notional value) of the swap in exchange for an equal face amount of deliverable obligations of the reference entity described in the swap, or the seller may be required to deliver the related net cash amount, if the swap is cash settled. The Fund may be either the buyer or seller in the transaction.
PFI Prospectus | Principal LifeTime Hybrid 2015 Fund | Derivatives Risk, Forward Contracts, Futures, And Swaps Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Forward Contracts, Futures, and Swaps. Forward contracts, futures, and swaps involve specific risks, including: the imperfect correlation between the change in market value of the instruments held by the fund and the price of the forward contract, future, or swap; possible lack of a liquid secondary market for a forward contract, future, or swap and the resulting inability to close a forward contract, future, or swap when desired; counterparty risk; and if the fund has insufficient cash, it may have to sell securities from its portfolio to meet daily variation margin requirements.
PFI Prospectus | Principal LifeTime Hybrid 2015 Fund | Derivatives Risk, Options Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Options. Options involve specific risks, including: the imperfect correlation between the change in market value of the instruments held by the Fund and the price of the options; counterparty risk; difference in trading hours for the options markets and the markets for the underlying securities (rate movements can take place in the underlying markets that cannot be reflected in the options markets); and an insufficient liquid secondary market for particular options.
PFI Prospectus | Principal LifeTime Hybrid 2015 Fund | Equity Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Equity Securities Risk. A variety of factors can negatively impact the value of equity securities held by a fund, including a decline in the issuer’s financial condition, unfavorable performance of the issuer’s sector or industry, or changes in response to overall market and economic conditions. A fund’s principal market segment(s) (such as market capitalization or style) may underperform other market segments or the equity markets as a whole.
•Growth Style Risk. Growth investing entails the risk that if growth companies do not increase their earnings at a rate expected by investors, the market price of their stock may decline significantly, even if earnings show an absolute increase. Growth company stocks also typically lack the dividend yield that can lessen price declines in market downturns.
•Smaller Companies Risk. Investments in smaller companies may involve greater risk and price volatility than investments in larger, more mature companies. Smaller companies may have limited product lines, markets, or financial resources; lack the competitive strength of larger companies; have less experienced managers; or depend on a few key employees. Their securities often are less widely held and trade less frequently and in lesser quantities, and their market prices often fluctuate more, than securities of larger companies.
•Value Style Risk. Value investing entails the risk that value stocks may continue to be undervalued by the market for extended periods, including the entire period during which the stock is held by a fund, or the events that would cause the stock price to increase may not occur as anticipated or at all. Moreover, a stock that appears to be undervalued actually may be appropriately priced at a low level and, therefore, would not be profitable for the fund.
PFI Prospectus | Principal LifeTime Hybrid 2015 Fund | Equity Securities Risk, Growth Style Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Growth Style Risk. Growth investing entails the risk that if growth companies do not increase their earnings at a rate expected by investors, the market price of their stock may decline significantly, even if earnings show an absolute increase. Growth company stocks also typically lack the dividend yield that can lessen price declines in market downturns.
PFI Prospectus | Principal LifeTime Hybrid 2015 Fund | Equity Securities Risk, Smaller Companies Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Smaller Companies Risk. Investments in smaller companies may involve greater risk and price volatility than investments in larger, more mature companies. Smaller companies may have limited product lines, markets, or financial resources; lack the competitive strength of larger companies; have less experienced managers; or depend on a few key employees. Their securities often are less widely held and trade less frequently and in lesser quantities, and their market prices often fluctuate more, than securities of larger companies.
PFI Prospectus | Principal LifeTime Hybrid 2015 Fund | Equity Securities Risk, Value Style Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Value Style Risk. Value investing entails the risk that value stocks may continue to be undervalued by the market for extended periods, including the entire period during which the stock is held by a fund, or the events that would cause the stock price to increase may not occur as anticipated or at all. Moreover, a stock that appears to be undervalued actually may be appropriately priced at a low level and, therefore, would not be profitable for the fund.
PFI Prospectus | Principal LifeTime Hybrid 2015 Fund | Fixed-Income Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Fixed-Income Securities Risk. Fixed-income securities are subject to interest rate, credit quality, and liquidity risks. The market value of fixed-income securities generally declines when interest rates rise, and increased interest rates may adversely affect the liquidity of certain fixed-income securities. Moreover, an issuer of fixed-income securities could default on its payment obligations due to increased interest rates or for other reasons.
PFI Prospectus | Principal LifeTime Hybrid 2015 Fund | Foreign Currency Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Foreign Currency Risk. Risks of investing in securities denominated in, or that trade in, foreign (non-U.S.) currencies include changes in foreign exchange rates and foreign exchange restrictions.
PFI Prospectus | Principal LifeTime Hybrid 2015 Fund | Foreign Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Foreign Securities Risk. The risks of foreign securities include loss of value as a result of: political or economic instability; nationalization, expropriation, or confiscatory taxation; settlement delays; and limited government regulation (including less stringent reporting, accounting, and disclosure standards than are required of U.S. companies).
PFI Prospectus | Principal LifeTime Hybrid 2015 Fund | Fund Of Funds Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Fund of Funds Risk. Fund shareholders bear indirectly their proportionate share of the expenses of other investment companies (for example, other mutual funds or exchange-traded funds) in which the Fund invests (“underlying funds”). The Fund’s selection and weighting of asset classes and allocation of investments in underlying funds may cause it to underperform other funds with a similar investment objective. The Fund’s performance and risks correspond directly to the performance and risks of the underlying funds in which it invests, proportionately in accordance with the weightings of such investments, and there is no assurance that the underlying funds will achieve their investment objectives. Management of the Fund entails potential conflicts of interest: the Fund invests in affiliated underlying funds; and PGI and its affiliates may earn different fees from different underlying funds and may have an incentive to allocate more Fund assets to underlying funds from which they receive higher fees.
PFI Prospectus | Principal LifeTime Hybrid 2015 Fund | Index Fund Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Index Fund Risk. Index funds use a passive investment approach and generally do not attempt to manage market volatility, use defensive strategies, or reduce the effect of any long-term periods of poor investment performance. Therefore, the Fund may hold securities that present risks that an investment advisor researching individual securities might seek to avoid. An index fund has operating and other expenses while an index does not. As a result, over time, index funds tend to underperform the index. The correlation between fund performance and index performance may also be affected by the type of passive investment approach used by a fund (sampling or replication), changes in securities markets, changes in the composition of the index, and the timing of purchases and sales of fund shares. Errors or delays in compiling or rebalancing the Index may impact the performance of the Fund and increase transaction costs.
PFI Prospectus | Principal LifeTime Hybrid 2015 Fund | Portfolio Duration Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Portfolio Duration Risk. Portfolio duration is a measure of the expected life of a fixed-income security and its sensitivity to changes in interest rates. The longer a fund’s average portfolio duration, the more sensitive the fund will be to changes in interest rates, which means funds with longer average portfolio durations may be more volatile than those with shorter durations.
PFI Prospectus | Principal LifeTime Hybrid 2015 Fund | Redemption And Large Transaction Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Redemption and Large Transaction Risk. Ownership of the Fund’s shares may be concentrated in one or a few large investors (such as funds of funds, institutional investors, and asset allocation programs) that may redeem or purchase shares in large quantities. These transactions may cause the Fund to sell securities to meet redemptions or to invest additional cash at times it would not otherwise do so, which may result in increased transaction costs, increased expenses, changes to expense ratios, and adverse effects to Fund performance. Such transactions may also accelerate the realization of taxable income if sales of portfolio securities result in gains. Moreover, reallocations by large shareholders among share classes of a fund may result in changes to the expense ratios of affected classes, which may increase the expenses paid by shareholders of the class that experienced the redemption.
PFI Prospectus | Principal LifeTime Hybrid 2015 Fund | Securitized Products Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Securitized Products Risk. Investments in securitized products are subject to risks similar to traditional fixed-income securities, such as credit, interest rate, liquidity, prepayment, extension, and default risk, as well as additional risks associated with the nature of the assets and the servicing of those assets. Unscheduled prepayments on securitized products may have to be reinvested at lower rates. A reduction in prepayments may increase the effective maturities of these securities, exposing them to the risk of decline in market value over time (extension risk).
PFI Prospectus | Principal LifeTime Hybrid 2015 Fund | Target Date Fund Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Target Date Fund Risk. A target date fund should not be selected based solely on age or retirement date because there is no guarantee that this Fund will provide adequate income at or through retirement.
PFI Prospectus | Principal LifeTime Hybrid 2015 Fund | U.S. Government Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
U.S. Government Securities Risk. Yields available from U.S. government securities are generally lower than yields from many other fixed-income securities. The value of U.S. government securities may be adversely impacted by changes in interest rates, changes in the credit rating of the U.S. government, or a default by the U.S. government.
PFI Prospectus | Principal LifeTime Hybrid 2015 Fund | U.S. Government-Sponsored Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
U.S. Government-Sponsored Securities Risk. Securities issued by U.S. government-sponsored enterprises such as the Federal Home Loan Mortgage Corporation, the Federal National Mortgage Association, and the Federal Home Loan Banks are not issued or guaranteed by the U.S. government.
PFI Prospectus | Principal LifeTime Hybrid 2015 Fund | Bloomberg U.S. Aggregate Bond Index (reflects no deduction for fees, expenses, or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Bloomberg U.S. Aggregate Bond Index (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 5.53%
5 Years rr_AverageAnnualReturnYear05 1.10%
Since Inception rr_AverageAnnualReturnSinceInception 1.51%
PFI Prospectus | Principal LifeTime Hybrid 2015 Fund | S&P Target Date 2015 Index  
Prospectus [Line Items] rr_ProspectusLineItems  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
Label rr_AverageAnnualReturnLabel S&P Target Date 2015 Index (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 11.38%
5 Years rr_AverageAnnualReturnYear05 6.10%
Since Inception rr_AverageAnnualReturnSinceInception 4.93%
PFI Prospectus | Principal LifeTime Hybrid 2015 Fund | Class J  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PHJMX
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.15%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.04%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.32%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.51%
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.51%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 152
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 164
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 285
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 640
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 52
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 164
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 285
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 640
Label rr_AverageAnnualReturnLabel Class J Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 9.95%
5 Years rr_AverageAnnualReturnYear05 5.77%
Since Inception rr_AverageAnnualReturnSinceInception 4.57%
PFI Prospectus | Principal LifeTime Hybrid 2015 Fund | Institutional Class  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PHTMX
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.14%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.32%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.46%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.09%) [41]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.37%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 38
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 139
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 249
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 570
Annual Return 2015 rr_AnnualReturn2015 (0.47%)
Annual Return 2016 rr_AnnualReturn2016 6.37%
Annual Return 2017 rr_AnnualReturn2017 11.78%
Annual Return 2018 rr_AnnualReturn2018 (4.52%)
Annual Return 2019 rr_AnnualReturn2019 15.18%
Annual Return 2020 rr_AnnualReturn2020 11.83%
Annual Return 2021 rr_AnnualReturn2021 8.09%
Annual Return 2022 rr_AnnualReturn2022 (13.61%)
Annual Return 2023 rr_AnnualReturn2023 11.09%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Highest return for a quarter during the period of the bar chart above:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 9.79%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Lowest return for a quarter during the period of the bar chart above:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Jun. 30, 2022
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (8.93%)
Label rr_AverageAnnualReturnLabel Institutional Class Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 11.09%
5 Years rr_AverageAnnualReturnYear05 5.97%
Since Inception rr_AverageAnnualReturnSinceInception 4.80%
PFI Prospectus | Principal LifeTime Hybrid 2015 Fund | Institutional Class | After Taxes on Distributions  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Institutional Class Return After Taxes on Distributions
1 Year rr_AverageAnnualReturnYear01 9.76%
5 Years rr_AverageAnnualReturnYear05 4.49%
Since Inception rr_AverageAnnualReturnSinceInception 3.53%
PFI Prospectus | Principal LifeTime Hybrid 2015 Fund | Institutional Class | After Taxes on Distributions and Sales  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Institutional Class Return After Taxes on Distributions and Sale of Fund Shares
1 Year rr_AverageAnnualReturnYear01 6.75%
5 Years rr_AverageAnnualReturnYear05 4.24%
Since Inception rr_AverageAnnualReturnSinceInception 3.36%
PFI Prospectus | Principal LifeTime Hybrid 2015 Fund | Class R-6  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PLRRX
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.06%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.32%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.38%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.04%) [41]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.34%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 35
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 118
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 209
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 476
Label rr_AverageAnnualReturnLabel Class R-6 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 11.11%
5 Years rr_AverageAnnualReturnYear05 5.99%
Since Inception rr_AverageAnnualReturnSinceInception 4.83%
PFI Prospectus | Principal LifeTime Hybrid 2020 Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading PRINCIPAL LIFETIME HYBRID 2020 FUND
Objective [Heading] rr_ObjectiveHeading Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The Fund seeks a total return consisting of long-term growth of capital and current income.
Expense [Heading] rr_ExpenseHeading Fees and Expenses of the Fund
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock
This table describes the fees and expenses that you may pay if you buy, hold, and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below.
If you purchase Institutional Class or Class R-6 shares through certain programs offered by certain financial intermediaries, you may be required to pay a commission and/or other forms of compensation to the broker, or to your Financial Professional or other financial intermediary.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder Fees (fees paid directly from your investment)
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination February 28, 2025
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock
The Fund and each underlying fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs. These costs, which are not reflected in Annual Fund Operating Expenses or in the Example, affect the Fund’s and the underlying funds' performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 18.1% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 18.10%
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. The calculation of costs takes into account any applicable contractual fee waivers and/or expense reimbursements for the period noted in the table above. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, No Redemption, By Year, Caption [Text] rr_ExpenseExampleNoRedemptionByYearCaption With respect to Class J shares, you would pay the following expenses if you did not redeem your shares (all other classes would be the same as in the above example):
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
The Fund operates as a “target date fund” that invests according to an asset allocation strategy designed for investors having a retirement investment goal close to the year in the Fund’s name. The Fund is a fund of funds that invests in underlying funds of Principal Funds, Inc. (“PFI”), with a majority of the Fund’s assets invested in index funds. Its underlying funds consist of domestic and foreign equity funds, fixed-income funds, real asset funds, and other funds that aim to offer diversification beyond traditional equity and fixed-income securities. The asset class diversification of the Fund is designed to moderate overall price volatility. The Fund may add, remove, or substitute underlying funds at any time.
The Fund is managed with strategic or long-term asset class targets and target ranges. There is a rebalancing strategy that aligns with the target weights to identify asset classes that are either overweight or underweight. The Fund may shift asset class targets in response to normal evaluative processes, the shortening time horizon of the Fund, or changes in market forces or Fund circumstances.
In selecting underlying funds and target weights, the Fund considers both quantitative measures (e.g., past performance, expected levels of risk and returns, expense levels, diversification, and style consistency) and qualitative factors (e.g., organizational stability, investment experience, investment and risk management processes, and information, trading, and compliance systems). There are no minimum or maximum percentages of assets that the Fund must invest in a specific asset class or underlying fund.
The underlying funds invest in growth and value stocks of small, medium, and large market capitalization companies, fixed-income securities, domestic and foreign securities, securities denominated in foreign currencies, investment companies (including index funds), securitized products, U.S. government and U.S. government-sponsored securities, and derivatives. A derivative is a financial arrangement, the value of which is derived from, or based on, a traditional security, asset, or market index. The underlying funds principally use futures, options, swaps (including, for example, credit default, interest rate, and currency swaps), and forwards in order to gain exposure to a variety of securities or asset classes or attempt to reduce risk.
The Fund’s asset allocation will become more conservative over time as investment goals near (for example, retirement, which is assumed to begin at age 65) and investors become more risk-averse. Approximately 10 years after its target year, the Fund’s underlying fund allocation is expected to match that of the Principal LifeTime Hybrid Income Fund. At that time, the Fund may be combined with the Principal LifeTime Hybrid Income Fund if the Board of Directors determines that the combination is in the best interests of Fund shareholders. It is expected that at the target date in the Fund’s name, the shareholder will begin gradually withdrawing the account’s value.
LT Hybrid Glidepath.jpg
Risk [Heading] rr_RiskHeading Principal Risks
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
The following information provides some indication of the risks of investing in the Fund. Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. You may get updated performance information at www.PrincipalAM.com.
The bar chart shows the investment returns of the Fund’s Institutional Class shares for each full calendar year of operations for 10 years (or, if shorter, the life of the Fund). The table shows for the last one, five, and ten calendar year periods (or, if shorter, the life of the Fund), how the Fund’s average annual total returns compare with those of one or more broad measures of market performance.
Life of Fund returns are measured from the date the Fund’s shares were first sold (September 30, 2014).
For periods prior to the inception date of Class R-6 shares (August 24, 2015) and Class J shares (March 1, 2018), the performance shown in the table for these newer classes is that of the Fund’s Institutional Class shares, adjusted to reflect the respective fees and expenses of each class. These adjustments result in performance for such periods that is no higher than the historical performance of the Institutional Class shares, which were first sold on September 30, 2014.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following information provides some indication of the risks of investing in the Fund.
Performance Additional Market Index [Text] rr_PerformanceAdditionalMarketIndex The S&P Target Date 2020 Index is included as an additional index for the Fund as it shows how the Fund’s performance compares with the returns of an index of funds with similar investment objectives.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.PrincipalAM.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.
Bar Chart [Heading] rr_BarChartHeading Total Returns as of December 31
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
Highest return for a quarter during the period of the bar chart above:Q2 202011.16 %
Lowest return for a quarter during the period of the bar chart above:Q1 2020(10.35)%
Performance Table Heading rr_PerformanceTableHeading Average Annual Total ReturnsFor the periods ended December 31, 2023
Performance Table Market Index Changed rr_PerformanceTableMarketIndexChanged Effective March 1, 2024, the Fund changed its primary broad-based index to the Bloomberg U.S. Aggregate Bond Index in order to meet the revised definition of “broad-based securities market index.”
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are shown for Institutional Class shares only and would be different for the other share classes.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock
After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. After-tax returns are shown for Institutional Class shares only and would be different for the other share classes.
Effective March 1, 2024, the Fund changed its primary broad-based index to the Bloomberg U.S. Aggregate Bond Index in order to meet the revised definition of “broad-based securities market index.” The S&P Target Date 2020 Index is included as an additional index for the Fund as it shows how the Fund’s performance compares with the returns of an index of funds with similar investment objectives.
PFI Prospectus | Principal LifeTime Hybrid 2020 Fund | Risk Lose Money [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Many factors affect that value, and it is possible to lose money by investing in the Fund.
PFI Prospectus | Principal LifeTime Hybrid 2020 Fund | Risk Not Insured Depository Institution [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
PFI Prospectus | Principal LifeTime Hybrid 2020 Fund | Counterparty Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Counterparty Risk. Counterparty risk is the risk that the counterparty to a contract or other obligation will be unable or unwilling to honor its obligations.
PFI Prospectus | Principal LifeTime Hybrid 2020 Fund | Derivatives Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Derivatives Risk. Derivatives may not move in the direction anticipated by the portfolio manager. Transactions in derivatives may increase volatility, cause the liquidation of portfolio positions when not advantageous to do so, and result in disproportionate losses that may be substantially greater than a fund’s initial investment.
•Credit Default Swaps. Credit default swaps involve special risks in addition to those associated with swaps generally because they are difficult to value, are highly susceptible to liquidity and credit risk, and generally pay a return to the party that has paid the premium only in the event of an actual default by the issuer of the underlying obligation (as opposed to a credit downgrade or other indication of financial difficulty). The protection “buyer” in a credit default contract may be obligated to pay the protection “seller” an up-front payment or a periodic stream of payments over the term of the contract, provided, generally, that no credit event on a reference obligation has occurred. If a credit event occurs, the seller generally must pay the buyer the “par value” (i.e., full notional value) of the swap in exchange for an equal face amount of deliverable obligations of the reference entity described in the swap, or the seller may be required to deliver the related net cash amount, if the swap is cash settled. The Fund may be either the buyer or seller in the transaction.
•Forward Contracts, Futures, and Swaps. Forward contracts, futures, and swaps involve specific risks, including: the imperfect correlation between the change in market value of the instruments held by the fund and the price of the forward contract, future, or swap; possible lack of a liquid secondary market for a forward contract, future, or swap and the resulting inability to close a forward contract, future, or swap when desired; counterparty risk; and if the fund has insufficient cash, it may have to sell securities from its portfolio to meet daily variation margin requirements.
•Options. Options involve specific risks, including: the imperfect correlation between the change in market value of the instruments held by the Fund and the price of the options; counterparty risk; difference in trading hours for the options markets and the markets for the underlying securities (rate movements can take place in the underlying markets that cannot be reflected in the options markets); and an insufficient liquid secondary market for particular options.
PFI Prospectus | Principal LifeTime Hybrid 2020 Fund | Derivatives Risk, Credit Default Swaps Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Credit Default Swaps. Credit default swaps involve special risks in addition to those associated with swaps generally because they are difficult to value, are highly susceptible to liquidity and credit risk, and generally pay a return to the party that has paid the premium only in the event of an actual default by the issuer of the underlying obligation (as opposed to a credit downgrade or other indication of financial difficulty). The protection “buyer” in a credit default contract may be obligated to pay the protection “seller” an up-front payment or a periodic stream of payments over the term of the contract, provided, generally, that no credit event on a reference obligation has occurred. If a credit event occurs, the seller generally must pay the buyer the “par value” (i.e., full notional value) of the swap in exchange for an equal face amount of deliverable obligations of the reference entity described in the swap, or the seller may be required to deliver the related net cash amount, if the swap is cash settled. The Fund may be either the buyer or seller in the transaction.
PFI Prospectus | Principal LifeTime Hybrid 2020 Fund | Derivatives Risk, Forward Contracts, Futures, And Swaps Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Forward Contracts, Futures, and Swaps. Forward contracts, futures, and swaps involve specific risks, including: the imperfect correlation between the change in market value of the instruments held by the fund and the price of the forward contract, future, or swap; possible lack of a liquid secondary market for a forward contract, future, or swap and the resulting inability to close a forward contract, future, or swap when desired; counterparty risk; and if the fund has insufficient cash, it may have to sell securities from its portfolio to meet daily variation margin requirements.
PFI Prospectus | Principal LifeTime Hybrid 2020 Fund | Derivatives Risk, Options Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Options. Options involve specific risks, including: the imperfect correlation between the change in market value of the instruments held by the Fund and the price of the options; counterparty risk; difference in trading hours for the options markets and the markets for the underlying securities (rate movements can take place in the underlying markets that cannot be reflected in the options markets); and an insufficient liquid secondary market for particular options.
PFI Prospectus | Principal LifeTime Hybrid 2020 Fund | Equity Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Equity Securities Risk. A variety of factors can negatively impact the value of equity securities held by a fund, including a decline in the issuer’s financial condition, unfavorable performance of the issuer’s sector or industry, or changes in response to overall market and economic conditions. A fund’s principal market segment(s) (such as market capitalization or style) may underperform other market segments or the equity markets as a whole.
•Growth Style Risk. Growth investing entails the risk that if growth companies do not increase their earnings at a rate expected by investors, the market price of their stock may decline significantly, even if earnings show an absolute increase. Growth company stocks also typically lack the dividend yield that can lessen price declines in market downturns.
•Smaller Companies Risk. Investments in smaller companies may involve greater risk and price volatility than investments in larger, more mature companies. Smaller companies may have limited product lines, markets, or financial resources; lack the competitive strength of larger companies; have less experienced managers; or depend on a few key employees. Their securities often are less widely held and trade less frequently and in lesser quantities, and their market prices often fluctuate more, than securities of larger companies.
•Value Style Risk. Value investing entails the risk that value stocks may continue to be undervalued by the market for extended periods, including the entire period during which the stock is held by a fund, or the events that would cause the stock price to increase may not occur as anticipated or at all. Moreover, a stock that appears to be undervalued actually may be appropriately priced at a low level and, therefore, would not be profitable for the fund.
PFI Prospectus | Principal LifeTime Hybrid 2020 Fund | Equity Securities Risk, Growth Style Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Growth Style Risk. Growth investing entails the risk that if growth companies do not increase their earnings at a rate expected by investors, the market price of their stock may decline significantly, even if earnings show an absolute increase. Growth company stocks also typically lack the dividend yield that can lessen price declines in market downturns.
PFI Prospectus | Principal LifeTime Hybrid 2020 Fund | Equity Securities Risk, Smaller Companies Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Smaller Companies Risk. Investments in smaller companies may involve greater risk and price volatility than investments in larger, more mature companies. Smaller companies may have limited product lines, markets, or financial resources; lack the competitive strength of larger companies; have less experienced managers; or depend on a few key employees. Their securities often are less widely held and trade less frequently and in lesser quantities, and their market prices often fluctuate more, than securities of larger companies.
PFI Prospectus | Principal LifeTime Hybrid 2020 Fund | Equity Securities Risk, Value Style Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Value Style Risk. Value investing entails the risk that value stocks may continue to be undervalued by the market for extended periods, including the entire period during which the stock is held by a fund, or the events that would cause the stock price to increase may not occur as anticipated or at all. Moreover, a stock that appears to be undervalued actually may be appropriately priced at a low level and, therefore, would not be profitable for the fund.
PFI Prospectus | Principal LifeTime Hybrid 2020 Fund | Fixed-Income Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Fixed-Income Securities Risk. Fixed-income securities are subject to interest rate, credit quality, and liquidity risks. The market value of fixed-income securities generally declines when interest rates rise, and increased interest rates may adversely affect the liquidity of certain fixed-income securities. Moreover, an issuer of fixed-income securities could default on its payment obligations due to increased interest rates or for other reasons.
PFI Prospectus | Principal LifeTime Hybrid 2020 Fund | Foreign Currency Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Foreign Currency Risk. Risks of investing in securities denominated in, or that trade in, foreign (non-U.S.) currencies include changes in foreign exchange rates and foreign exchange restrictions.
PFI Prospectus | Principal LifeTime Hybrid 2020 Fund | Foreign Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Foreign Securities Risk. The risks of foreign securities include loss of value as a result of: political or economic instability; nationalization, expropriation, or confiscatory taxation; settlement delays; and limited government regulation (including less stringent reporting, accounting, and disclosure standards than are required of U.S. companies).
PFI Prospectus | Principal LifeTime Hybrid 2020 Fund | Fund Of Funds Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Fund of Funds Risk. Fund shareholders bear indirectly their proportionate share of the expenses of other investment companies (for example, other mutual funds or exchange-traded funds) in which the Fund invests (“underlying funds”). The Fund’s selection and weighting of asset classes and allocation of investments in underlying funds may cause it to underperform other funds with a similar investment objective. The Fund’s performance and risks correspond directly to the performance and risks of the underlying funds in which it invests, proportionately in accordance with the weightings of such investments, and there is no assurance that the underlying funds will achieve their investment objectives. Management of the Fund entails potential conflicts of interest: the Fund invests in affiliated underlying funds; and PGI and its affiliates may earn different fees from different underlying funds and may have an incentive to allocate more Fund assets to underlying funds from which they receive higher fees.
PFI Prospectus | Principal LifeTime Hybrid 2020 Fund | Index Fund Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Index Fund Risk. Index funds use a passive investment approach and generally do not attempt to manage market volatility, use defensive strategies, or reduce the effect of any long-term periods of poor investment performance. Therefore, the Fund may hold securities that present risks that an investment advisor researching individual securities might seek to avoid. An index fund has operating and other expenses while an index does not. As a result, over time, index funds tend to underperform the index. The correlation between fund performance and index performance may also be affected by the type of passive investment approach used by a fund (sampling or replication), changes in securities markets, changes in the composition of the index, and the timing of purchases and sales of fund shares. Errors or delays in compiling or rebalancing the Index may impact the performance of the Fund and increase transaction costs.
PFI Prospectus | Principal LifeTime Hybrid 2020 Fund | Portfolio Duration Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Portfolio Duration Risk. Portfolio duration is a measure of the expected life of a fixed-income security and its sensitivity to changes in interest rates. The longer a fund’s average portfolio duration, the more sensitive the fund will be to changes in interest rates, which means funds with longer average portfolio durations may be more volatile than those with shorter durations.
PFI Prospectus | Principal LifeTime Hybrid 2020 Fund | Redemption And Large Transaction Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Redemption and Large Transaction Risk. Ownership of the Fund’s shares may be concentrated in one or a few large investors (such as funds of funds, institutional investors, and asset allocation programs) that may redeem or purchase shares in large quantities. These transactions may cause the Fund to sell securities to meet redemptions or to invest additional cash at times it would not otherwise do so, which may result in increased transaction costs, increased expenses, changes to expense ratios, and adverse effects to Fund performance. Such transactions may also accelerate the realization of taxable income if sales of portfolio securities result in gains. Moreover, reallocations by large shareholders among share classes of a fund may result in changes to the expense ratios of affected classes, which may increase the expenses paid by shareholders of the class that experienced the redemption.
PFI Prospectus | Principal LifeTime Hybrid 2020 Fund | Securitized Products Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Securitized Products Risk. Investments in securitized products are subject to risks similar to traditional fixed-income securities, such as credit, interest rate, liquidity, prepayment, extension, and default risk, as well as additional risks associated with the nature of the assets and the servicing of those assets. Unscheduled prepayments on securitized products may have to be reinvested at lower rates. A reduction in prepayments may increase the effective maturities of these securities, exposing them to the risk of decline in market value over time (extension risk).
PFI Prospectus | Principal LifeTime Hybrid 2020 Fund | Target Date Fund Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Target Date Fund Risk. A target date fund should not be selected based solely on age or retirement date because there is no guarantee that this Fund will provide adequate income at or through retirement.
PFI Prospectus | Principal LifeTime Hybrid 2020 Fund | U.S. Government Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
U.S. Government Securities Risk. Yields available from U.S. government securities are generally lower than yields from many other fixed-income securities. The value of U.S. government securities may be adversely impacted by changes in interest rates, changes in the credit rating of the U.S. government, or a default by the U.S. government.
PFI Prospectus | Principal LifeTime Hybrid 2020 Fund | U.S. Government-Sponsored Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
U.S. Government-Sponsored Securities Risk. Securities issued by U.S. government-sponsored enterprises such as the Federal Home Loan Mortgage Corporation, the Federal National Mortgage Association, and the Federal Home Loan Banks are not issued or guaranteed by the U.S. government.
PFI Prospectus | Principal LifeTime Hybrid 2020 Fund | Bloomberg U.S. Aggregate Bond Index (reflects no deduction for fees, expenses, or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
Label rr_AverageAnnualReturnLabel Bloomberg U.S. Aggregate Bond Index (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 5.53%
5 Years rr_AverageAnnualReturnYear05 1.10%
Since Inception rr_AverageAnnualReturnSinceInception 1.51%
PFI Prospectus | Principal LifeTime Hybrid 2020 Fund | S&P Target Date 2020 Index (reflects no deduction for fees, expenses, or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
Label rr_AverageAnnualReturnLabel S&P Target Date 2020 Index (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 12.32%
5 Years rr_AverageAnnualReturnYear05 6.47%
Since Inception rr_AverageAnnualReturnSinceInception 5.28%
PFI Prospectus | Principal LifeTime Hybrid 2020 Fund | Class J  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PHJTX
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.15%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.03%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.32%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.50%
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.50%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 151
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 160
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 280
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 628
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 51
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 160
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 280
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 628
Label rr_AverageAnnualReturnLabel Class J Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 10.95%
5 Years rr_AverageAnnualReturnYear05 6.72%
Since Inception rr_AverageAnnualReturnSinceInception 5.27%
PFI Prospectus | Principal LifeTime Hybrid 2020 Fund | Institutional Class  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PHTTX
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.10%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.32%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.42%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.05%) [42]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.37%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 38
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 130
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 230
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 525
Annual Return 2015 rr_AnnualReturn2015 (0.23%)
Annual Return 2016 rr_AnnualReturn2016 7.02%
Annual Return 2017 rr_AnnualReturn2017 13.51%
Annual Return 2018 rr_AnnualReturn2018 (5.44%)
Annual Return 2019 rr_AnnualReturn2019 17.17%
Annual Return 2020 rr_AnnualReturn2020 12.62%
Annual Return 2021 rr_AnnualReturn2021 9.96%
Annual Return 2022 rr_AnnualReturn2022 (14.35%)
Annual Return 2023 rr_AnnualReturn2023 12.08%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Highest return for a quarter during the period of the bar chart above:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 11.16%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Lowest return for a quarter during the period of the bar chart above:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (10.35%)
Label rr_AverageAnnualReturnLabel Institutional Class Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 12.08%
5 Years rr_AverageAnnualReturnYear05 6.85%
Since Inception rr_AverageAnnualReturnSinceInception 5.47%
PFI Prospectus | Principal LifeTime Hybrid 2020 Fund | Institutional Class | After Taxes on Distributions  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Institutional Class Return After Taxes on Distributions
1 Year rr_AverageAnnualReturnYear01 10.76%
5 Years rr_AverageAnnualReturnYear05 5.31%
Since Inception rr_AverageAnnualReturnSinceInception 4.14%
PFI Prospectus | Principal LifeTime Hybrid 2020 Fund | Institutional Class | After Taxes on Distributions and Sales  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Institutional Class Return After Taxes on Distributions and Sale of Fund Shares
1 Year rr_AverageAnnualReturnYear01 7.37%
5 Years rr_AverageAnnualReturnYear05 4.96%
Since Inception rr_AverageAnnualReturnSinceInception 3.92%
PFI Prospectus | Principal LifeTime Hybrid 2020 Fund | Class R-6  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PLTTX
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.02%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.32%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.34%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets none [42]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.34%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 35
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 109
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 191
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 431
Label rr_AverageAnnualReturnLabel Class R-6 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 12.21%
5 Years rr_AverageAnnualReturnYear05 6.91%
Since Inception rr_AverageAnnualReturnSinceInception 5.51%
PFI Prospectus | Principal LifeTime Hybrid 2025 Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading PRINCIPAL LIFETIME HYBRID 2025 FUND
Objective [Heading] rr_ObjectiveHeading Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The Fund seeks a total return consisting of long-term growth of capital and current income.
Expense [Heading] rr_ExpenseHeading Fees and Expenses of the Fund
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock
This table describes the fees and expenses that you may pay if you buy, hold, and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below.
If you purchase Institutional Class or Class R-6 shares through certain programs offered by certain financial intermediaries, you may be required to pay a commission and/or other forms of compensation to the broker, or to your Financial Professional or other financial intermediary.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder Fees (fees paid directly from your investment)
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination February 28, 2025
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock
The Fund and each underlying fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs. These costs, which are not reflected in Annual Fund Operating Expenses or in the Example, affect the Fund’s and the underlying funds' performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 12.3% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 12.30%
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. The calculation of costs takes into account any applicable contractual fee waivers and/or expense reimbursements for the period noted in the table above. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, No Redemption, By Year, Caption [Text] rr_ExpenseExampleNoRedemptionByYearCaption With respect to Class J shares, you would pay the following expenses if you did not redeem your shares (all other classes would be the same as in the above example):
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
The Fund operates as a “target date fund” that invests according to an asset allocation strategy designed for investors having a retirement investment goal close to the year in the Fund’s name. The Fund is a fund of funds that invests in underlying funds of Principal Funds, Inc. (“PFI”), with a majority of the Fund’s assets invested in index funds. Its underlying funds consist of domestic and foreign equity funds, fixed-income funds, real asset funds, and other funds that aim to offer diversification beyond traditional equity and fixed-income securities. The asset class diversification of the Fund is designed to moderate overall price volatility. The Fund may add, remove, or substitute underlying funds at any time.
The Fund is managed with strategic or long-term asset class targets and target ranges. There is a rebalancing strategy that aligns with the target weights to identify asset classes that are either overweight or underweight. The Fund may shift asset class targets in response to normal evaluative processes, the shortening time horizon of the Fund, or changes in market forces or Fund circumstances.
In selecting underlying funds and target weights, the Fund considers both quantitative measures (e.g., past performance, expected levels of risk and returns, expense levels, diversification, and style consistency) and qualitative factors (e.g., organizational stability, investment experience, investment and risk management processes, and information, trading, and compliance systems). There are no minimum or maximum percentages of assets that the Fund must invest in a specific asset class or underlying fund.
The underlying funds invest in growth and value stocks of small, medium, and large market capitalization companies, fixed-income securities, domestic and foreign securities, securities denominated in foreign currencies, investment companies (including index funds), securitized products, U.S. government and U.S. government-sponsored securities, and derivatives. A derivative is a financial arrangement, the value of which is derived from, or based on, a traditional security, asset, or market index. The underlying funds principally use futures, options, swaps (including, for example, credit default, interest rate, and currency swaps), and forwards in order to gain exposure to a variety of securities or asset classes or attempt to reduce risk.
The Fund’s asset allocation will become more conservative over time as investment goals near (for example, retirement, which is assumed to begin at age 65) and investors become more risk-averse. Approximately 10 years after its target year, the Fund’s underlying fund allocation is expected to match that of the Principal LifeTime Hybrid Income Fund. At that time, the Fund may be combined with the Principal LifeTime Hybrid Income Fund if the Board of Directors determines that the combination is in the best interests of Fund shareholders. It is expected that at the target date in the Fund’s name, the shareholder will begin gradually withdrawing the account’s value.
LT Hybrid Glidepath.jpg
Risk [Heading] rr_RiskHeading Principal Risks
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
The following information provides some indication of the risks of investing in the Fund. Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. You may get updated performance information at www.PrincipalAM.com.
The bar chart shows the investment returns of the Fund’s Institutional Class shares for each full calendar year of operations for 10 years (or, if shorter, the life of the Fund). The table shows for the last one, five, and ten calendar year periods (or, if shorter, the life of the Fund), how the Fund’s average annual total returns compare with those of one or more broad measures of market performance.
Life of Fund returns are measured from the date the Fund’s shares were first sold (September 30, 2014).
For periods prior to the inception date of Class R-6 shares (August 24, 2015) and Class J shares (March 1, 2018), the performance shown in the table for these newer classes is that of the Fund’s Institutional Class shares, adjusted to reflect the respective fees and expenses of each class. These adjustments result in performance for such periods that is no higher than the historical performance of the Institutional Class shares, which were first sold on September 30, 2014.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following information provides some indication of the risks of investing in the Fund.
Performance Additional Market Index [Text] rr_PerformanceAdditionalMarketIndex The S&P Target Date 2025 Index is included as an additional index for the Fund as it shows how the Fund’s performance compares with the returns of an index of funds with similar investment objectives.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.PrincipalAM.com.
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.
Bar Chart [Heading] rr_BarChartHeading Total Returns as of December 31
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
Highest return for a quarter during the period of the bar chart above:Q2 202012.56 %
Lowest return for a quarter during the period of the bar chart above:Q1 2020(12.50)%
Performance Table Heading rr_PerformanceTableHeading Average Annual Total ReturnsFor the periods ended December 31, 2023
Performance Table Market Index Changed rr_PerformanceTableMarketIndexChanged Effective March 1, 2024, the Fund changed its primary broad-based index to the Bloomberg U.S. Aggregate Bond Index in order to meet the revised definition of “broad-based securities market index.”
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are shown for Institutional Class shares only and would be different for the other share classes.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock
After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. After-tax returns are shown for Institutional Class shares only and would be different for the other share classes.
Effective March 1, 2024, the Fund changed its primary broad-based index to the Bloomberg U.S. Aggregate Bond Index in order to meet the revised definition of “broad-based securities market index.” The S&P Target Date 2025 Index is included as an additional index for the Fund as it shows how the Fund’s performance compares with the returns of an index of funds with similar investment objectives.
PFI Prospectus | Principal LifeTime Hybrid 2025 Fund | Risk Lose Money [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Many factors affect that value, and it is possible to lose money by investing in the Fund.
PFI Prospectus | Principal LifeTime Hybrid 2025 Fund | Risk Not Insured Depository Institution [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
PFI Prospectus | Principal LifeTime Hybrid 2025 Fund | Counterparty Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Counterparty Risk. Counterparty risk is the risk that the counterparty to a contract or other obligation will be unable or unwilling to honor its obligations.
PFI Prospectus | Principal LifeTime Hybrid 2025 Fund | Derivatives Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Derivatives Risk. Derivatives may not move in the direction anticipated by the portfolio manager. Transactions in derivatives may increase volatility, cause the liquidation of portfolio positions when not advantageous to do so, and result in disproportionate losses that may be substantially greater than a fund’s initial investment.
•Credit Default Swaps. Credit default swaps involve special risks in addition to those associated with swaps generally because they are difficult to value, are highly susceptible to liquidity and credit risk, and generally pay a return to the party that has paid the premium only in the event of an actual default by the issuer of the underlying obligation (as opposed to a credit downgrade or other indication of financial difficulty). The protection “buyer” in a credit default contract may be obligated to pay the protection “seller” an up-front payment or a periodic stream of payments over the term of the contract, provided, generally, that no credit event on a reference obligation has occurred. If a credit event occurs, the seller generally must pay the buyer the “par value” (i.e., full notional value) of the swap in exchange for an equal face amount of deliverable obligations of the reference entity described in the swap, or the seller may be required to deliver the related net cash amount, if the swap is cash settled. The Fund may be either the buyer or seller in the transaction.
•Forward Contracts, Futures, and Swaps. Forward contracts, futures, and swaps involve specific risks, including: the imperfect correlation between the change in market value of the instruments held by the fund and the price of the forward contract, future, or swap; possible lack of a liquid secondary market for a forward contract, future, or swap and the resulting inability to close a forward contract, future, or swap when desired; counterparty risk; and if the fund has insufficient cash, it may have to sell securities from its portfolio to meet daily variation margin requirements.
•Options. Options involve specific risks, including: the imperfect correlation between the change in market value of the instruments held by the Fund and the price of the options; counterparty risk; difference in trading hours for the options markets and the markets for the underlying securities (rate movements can take place in the underlying markets that cannot be reflected in the options markets); and an insufficient liquid secondary market for particular options.
PFI Prospectus | Principal LifeTime Hybrid 2025 Fund | Derivatives Risk, Credit Default Swaps Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Credit Default Swaps. Credit default swaps involve special risks in addition to those associated with swaps generally because they are difficult to value, are highly susceptible to liquidity and credit risk, and generally pay a return to the party that has paid the premium only in the event of an actual default by the issuer of the underlying obligation (as opposed to a credit downgrade or other indication of financial difficulty). The protection “buyer” in a credit default contract may be obligated to pay the protection “seller” an up-front payment or a periodic stream of payments over the term of the contract, provided, generally, that no credit event on a reference obligation has occurred. If a credit event occurs, the seller generally must pay the buyer the “par value” (i.e., full notional value) of the swap in exchange for an equal face amount of deliverable obligations of the reference entity described in the swap, or the seller may be required to deliver the related net cash amount, if the swap is cash settled. The Fund may be either the buyer or seller in the transaction.
PFI Prospectus | Principal LifeTime Hybrid 2025 Fund | Derivatives Risk, Forward Contracts, Futures, And Swaps Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Forward Contracts, Futures, and Swaps. Forward contracts, futures, and swaps involve specific risks, including: the imperfect correlation between the change in market value of the instruments held by the fund and the price of the forward contract, future, or swap; possible lack of a liquid secondary market for a forward contract, future, or swap and the resulting inability to close a forward contract, future, or swap when desired; counterparty risk; and if the fund has insufficient cash, it may have to sell securities from its portfolio to meet daily variation margin requirements.
PFI Prospectus | Principal LifeTime Hybrid 2025 Fund | Derivatives Risk, Options Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Options. Options involve specific risks, including: the imperfect correlation between the change in market value of the instruments held by the Fund and the price of the options; counterparty risk; difference in trading hours for the options markets and the markets for the underlying securities (rate movements can take place in the underlying markets that cannot be reflected in the options markets); and an insufficient liquid secondary market for particular options.
PFI Prospectus | Principal LifeTime Hybrid 2025 Fund | Equity Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Equity Securities Risk. A variety of factors can negatively impact the value of equity securities held by a fund, including a decline in the issuer’s financial condition, unfavorable performance of the issuer’s sector or industry, or changes in response to overall market and economic conditions. A fund’s principal market segment(s) (such as market capitalization or style) may underperform other market segments or the equity markets as a whole.
•Growth Style Risk. Growth investing entails the risk that if growth companies do not increase their earnings at a rate expected by investors, the market price of their stock may decline significantly, even if earnings show an absolute increase. Growth company stocks also typically lack the dividend yield that can lessen price declines in market downturns.
•Smaller Companies Risk. Investments in smaller companies may involve greater risk and price volatility than investments in larger, more mature companies. Smaller companies may have limited product lines, markets, or financial resources; lack the competitive strength of larger companies; have less experienced managers; or depend on a few key employees. Their securities often are less widely held and trade less frequently and in lesser quantities, and their market prices often fluctuate more, than securities of larger companies.
•Value Style Risk. Value investing entails the risk that value stocks may continue to be undervalued by the market for extended periods, including the entire period during which the stock is held by a fund, or the events that would cause the stock price to increase may not occur as anticipated or at all. Moreover, a stock that appears to be undervalued actually may be appropriately priced at a low level and, therefore, would not be profitable for the fund.
PFI Prospectus | Principal LifeTime Hybrid 2025 Fund | Equity Securities Risk, Growth Style Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Growth Style Risk. Growth investing entails the risk that if growth companies do not increase their earnings at a rate expected by investors, the market price of their stock may decline significantly, even if earnings show an absolute increase. Growth company stocks also typically lack the dividend yield that can lessen price declines in market downturns.
PFI Prospectus | Principal LifeTime Hybrid 2025 Fund | Equity Securities Risk, Smaller Companies Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Smaller Companies Risk. Investments in smaller companies may involve greater risk and price volatility than investments in larger, more mature companies. Smaller companies may have limited product lines, markets, or financial resources; lack the competitive strength of larger companies; have less experienced managers; or depend on a few key employees. Their securities often are less widely held and trade less frequently and in lesser quantities, and their market prices often fluctuate more, than securities of larger companies.
PFI Prospectus | Principal LifeTime Hybrid 2025 Fund | Equity Securities Risk, Value Style Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Value Style Risk. Value investing entails the risk that value stocks may continue to be undervalued by the market for extended periods, including the entire period during which the stock is held by a fund, or the events that would cause the stock price to increase may not occur as anticipated or at all. Moreover, a stock that appears to be undervalued actually may be appropriately priced at a low level and, therefore, would not be profitable for the fund.
PFI Prospectus | Principal LifeTime Hybrid 2025 Fund | Fixed-Income Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Fixed-Income Securities Risk. Fixed-income securities are subject to interest rate, credit quality, and liquidity risks. The market value of fixed-income securities generally declines when interest rates rise, and increased interest rates may adversely affect the liquidity of certain fixed-income securities. Moreover, an issuer of fixed-income securities could default on its payment obligations due to increased interest rates or for other reasons.
PFI Prospectus | Principal LifeTime Hybrid 2025 Fund | Foreign Currency Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Foreign Currency Risk. Risks of investing in securities denominated in, or that trade in, foreign (non-U.S.) currencies include changes in foreign exchange rates and foreign exchange restrictions.
PFI Prospectus | Principal LifeTime Hybrid 2025 Fund | Foreign Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Foreign Securities Risk. The risks of foreign securities include loss of value as a result of: political or economic instability; nationalization, expropriation, or confiscatory taxation; settlement delays; and limited government regulation (including less stringent reporting, accounting, and disclosure standards than are required of U.S. companies).
PFI Prospectus | Principal LifeTime Hybrid 2025 Fund | Fund Of Funds Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Fund of Funds Risk. Fund shareholders bear indirectly their proportionate share of the expenses of other investment companies (for example, other mutual funds or exchange-traded funds) in which the Fund invests (“underlying funds”). The Fund’s selection and weighting of asset classes and allocation of investments in underlying funds may cause it to underperform other funds with a similar investment objective. The Fund’s performance and risks correspond directly to the performance and risks of the underlying funds in which it invests, proportionately in accordance with the weightings of such investments, and there is no assurance that the underlying funds will achieve their investment objectives. Management of the Fund entails potential conflicts of interest: the Fund invests in affiliated underlying funds; and PGI and its affiliates may earn different fees from different underlying funds and may have an incentive to allocate more Fund assets to underlying funds from which they receive higher fees.
PFI Prospectus | Principal LifeTime Hybrid 2025 Fund | Index Fund Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Index Fund Risk. Index funds use a passive investment approach and generally do not attempt to manage market volatility, use defensive strategies, or reduce the effect of any long-term periods of poor investment performance. Therefore, the Fund may hold securities that present risks that an investment advisor researching individual securities might seek to avoid. An index fund has operating and other expenses while an index does not. As a result, over time, index funds tend to underperform the index. The correlation between fund performance and index performance may also be affected by the type of passive investment approach used by a fund (sampling or replication), changes in securities markets, changes in the composition of the index, and the timing of purchases and sales of fund shares. Errors or delays in compiling or rebalancing the Index may impact the performance of the Fund and increase transaction costs.
PFI Prospectus | Principal LifeTime Hybrid 2025 Fund | Portfolio Duration Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Portfolio Duration Risk. Portfolio duration is a measure of the expected life of a fixed-income security and its sensitivity to changes in interest rates. The longer a fund’s average portfolio duration, the more sensitive the fund will be to changes in interest rates, which means funds with longer average portfolio durations may be more volatile than those with shorter durations.
PFI Prospectus | Principal LifeTime Hybrid 2025 Fund | Redemption And Large Transaction Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Redemption and Large Transaction Risk. Ownership of the Fund’s shares may be concentrated in one or a few large investors (such as funds of funds, institutional investors, and asset allocation programs) that may redeem or purchase shares in large quantities. These transactions may cause the Fund to sell securities to meet redemptions or to invest additional cash at times it would not otherwise do so, which may result in increased transaction costs, increased expenses, changes to expense ratios, and adverse effects to Fund performance. Such transactions may also accelerate the realization of taxable income if sales of portfolio securities result in gains. Moreover, reallocations by large shareholders among share classes of a fund may result in changes to the expense ratios of affected classes, which may increase the expenses paid by shareholders of the class that experienced the redemption.
PFI Prospectus | Principal LifeTime Hybrid 2025 Fund | Securitized Products Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Securitized Products Risk. Investments in securitized products are subject to risks similar to traditional fixed-income securities, such as credit, interest rate, liquidity, prepayment, extension, and default risk, as well as additional risks associated with the nature of the assets and the servicing of those assets. Unscheduled prepayments on securitized products may have to be reinvested at lower rates. A reduction in prepayments may increase the effective maturities of these securities, exposing them to the risk of decline in market value over time (extension risk).
PFI Prospectus | Principal LifeTime Hybrid 2025 Fund | Target Date Fund Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Target Date Fund Risk. A target date fund should not be selected based solely on age or retirement date because there is no guarantee that this Fund will provide adequate income at or through retirement.
PFI Prospectus | Principal LifeTime Hybrid 2025 Fund | U.S. Government Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
U.S. Government Securities Risk. Yields available from U.S. government securities are generally lower than yields from many other fixed-income securities. The value of U.S. government securities may be adversely impacted by changes in interest rates, changes in the credit rating of the U.S. government, or a default by the U.S. government.
PFI Prospectus | Principal LifeTime Hybrid 2025 Fund | U.S. Government-Sponsored Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
U.S. Government-Sponsored Securities Risk. Securities issued by U.S. government-sponsored enterprises such as the Federal Home Loan Mortgage Corporation, the Federal National Mortgage Association, and the Federal Home Loan Banks are not issued or guaranteed by the U.S. government.
PFI Prospectus | Principal LifeTime Hybrid 2025 Fund | Bloomberg U.S. Aggregate Bond Index (reflects no deduction for fees, expenses, or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
Label rr_AverageAnnualReturnLabel Bloomberg U.S. Aggregate Bond Index (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 5.53%
5 Years rr_AverageAnnualReturnYear05 1.10%
Since Inception rr_AverageAnnualReturnSinceInception 1.51%
PFI Prospectus | Principal LifeTime Hybrid 2025 Fund | S&P Target Date 2025 Index (reflects no deduction for fees, expenses, or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
Label rr_AverageAnnualReturnLabel S&P Target Date 2025 Index (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 12.99%
5 Years rr_AverageAnnualReturnYear05 7.42%
Since Inception rr_AverageAnnualReturnSinceInception 5.91%
PFI Prospectus | Principal LifeTime Hybrid 2025 Fund | Class J  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PHJQX
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.15%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.02%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.32%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.49%
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.49%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 150
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 157
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 274
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 616
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 50
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 157
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 274
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 616
Label rr_AverageAnnualReturnLabel Class J Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 12.14%
5 Years rr_AverageAnnualReturnYear05 7.65%
Since Inception rr_AverageAnnualReturnSinceInception 5.92%
PFI Prospectus | Principal LifeTime Hybrid 2025 Fund | Institutional Class  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PHTQX
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.08%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.32%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.40%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.03%) [43]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.37%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 38
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 125
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 221
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 502
Annual Return 2015 rr_AnnualReturn2015 (0.18%)
Annual Return 2016 rr_AnnualReturn2016 7.51%
Annual Return 2017 rr_AnnualReturn2017 15.23%
Annual Return 2018 rr_AnnualReturn2018 (6.54%)
Annual Return 2019 rr_AnnualReturn2019 19.24%
Annual Return 2020 rr_AnnualReturn2020 13.61%
Annual Return 2021 rr_AnnualReturn2021 11.96%
Annual Return 2022 rr_AnnualReturn2022 (15.17%)
Annual Return 2023 rr_AnnualReturn2023 13.24%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Highest return for a quarter during the period of the bar chart above:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 12.56%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Lowest return for a quarter during the period of the bar chart above:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (12.50%)
Label rr_AverageAnnualReturnLabel Institutional Class Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 13.24%
5 Years rr_AverageAnnualReturnYear05 7.82%
Since Inception rr_AverageAnnualReturnSinceInception 6.12%
PFI Prospectus | Principal LifeTime Hybrid 2025 Fund | Institutional Class | After Taxes on Distributions  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Institutional Class Return After Taxes on Distributions
1 Year rr_AverageAnnualReturnYear01 11.95%
5 Years rr_AverageAnnualReturnYear05 6.37%
Since Inception rr_AverageAnnualReturnSinceInception 4.86%
PFI Prospectus | Principal LifeTime Hybrid 2025 Fund | Institutional Class | After Taxes on Distributions and Sales  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Institutional Class Return After Taxes on Distributions and Sale of Fund Shares
1 Year rr_AverageAnnualReturnYear01 8.12%
5 Years rr_AverageAnnualReturnYear05 5.78%
Since Inception rr_AverageAnnualReturnSinceInception 4.48%
PFI Prospectus | Principal LifeTime Hybrid 2025 Fund | Class R-6  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PLFTX
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.02%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.32%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.34%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets none [43]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.34%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 35
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 109
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 191
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 431
Label rr_AverageAnnualReturnLabel Class R-6 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 13.28%
5 Years rr_AverageAnnualReturnYear05 7.83%
Since Inception rr_AverageAnnualReturnSinceInception 6.14%
PFI Prospectus | Principal LifeTime Hybrid 2030 Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading PRINCIPAL LIFETIME HYBRID 2030 FUND
Objective [Heading] rr_ObjectiveHeading Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The Fund seeks a total return consisting of long-term growth of capital and current income.
Expense [Heading] rr_ExpenseHeading Fees and Expenses of the Fund
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock
This table describes the fees and expenses that you may pay if you buy, hold, and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below.
If you purchase Institutional Class or Class R-6 shares through certain programs offered by certain financial intermediaries, you may be required to pay a commission and/or other forms of compensation to the broker, or to your Financial Professional or other financial intermediary.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder Fees (fees paid directly from your investment)
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination February 28, 2025
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock
The Fund and each underlying fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs. These costs, which are not reflected in Annual Fund Operating Expenses or in the Example, affect the Fund’s and the underlying funds' performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 11.5% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 11.50%
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. The calculation of costs takes into account any applicable contractual fee waivers and/or expense reimbursements for the period noted in the table above. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, No Redemption, By Year, Caption [Text] rr_ExpenseExampleNoRedemptionByYearCaption With respect to Class J shares, you would pay the following expenses if you did not redeem your shares (all other classes would be the same as in the above example):
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
The Fund operates as a “target date fund” that invests according to an asset allocation strategy designed for investors having a retirement investment goal close to the year in the Fund’s name. The Fund is a fund of funds that invests in underlying funds of Principal Funds, Inc. (“PFI”), with a majority of the Fund’s assets invested in index funds. Its underlying funds consist of domestic and foreign equity funds, fixed-income funds, real asset funds, and other funds that aim to offer diversification beyond traditional equity and fixed-income securities. The asset class diversification of the Fund is designed to moderate overall price volatility. The Fund may add, remove, or substitute underlying funds at any time.
The Fund is managed with strategic or long-term asset class targets and target ranges. There is a rebalancing strategy that aligns with the target weights to identify asset classes that are either overweight or underweight. The Fund may shift asset class targets in response to normal evaluative processes, the shortening time horizon of the Fund, or changes in market forces or Fund circumstances.
In selecting underlying funds and target weights, the Fund considers both quantitative measures (e.g., past performance, expected levels of risk and returns, expense levels, diversification, and style consistency) and qualitative factors (e.g., organizational stability, investment experience, investment and risk management processes, and information, trading, and compliance systems). There are no minimum or maximum percentages of assets that the Fund must invest in a specific asset class or underlying fund.
The underlying funds invest in growth and value stocks of small, medium, and large market capitalization companies, fixed-income securities, domestic and foreign securities, securities denominated in foreign currencies, investment companies (including index funds), U.S. government and U.S. government-sponsored securities, and derivatives. A derivative is a financial arrangement, the value of which is derived from, or based on, a traditional security, asset, or market index. The underlying funds principally use futures, options, swaps (including, for example, credit default, interest rate, and currency swaps), and forwards in order to gain exposure to a variety of securities or asset classes or attempt to reduce risk.
The Fund’s asset allocation will become more conservative over time as investment goals near (for example, retirement, which is assumed to begin at age 65) and investors become more risk-averse. Approximately 10 years after its target year, the Fund’s underlying fund allocation is expected to match that of the Principal LifeTime Hybrid Income Fund. At that time, the Fund may be combined with the Principal LifeTime Hybrid Income Fund if the Board of Directors determines that the combination is in the best interests of Fund shareholders. It is expected that at the target date in the Fund’s name, the shareholder will begin gradually withdrawing the account’s value.
LT Hybrid Glidepath.jpg
Risk [Heading] rr_RiskHeading Principal Risks
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
The following information provides some indication of the risks of investing in the Fund. Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. You may get updated performance information at www.PrincipalAM.com.
The bar chart shows the investment returns of the Fund’s Institutional Class shares for each full calendar year of operations for 10 years (or, if shorter, the life of the Fund). The table shows for the last one, five, and ten calendar year periods (or, if shorter, the life of the Fund), how the Fund’s average annual total returns compare with those of one or more broad measures of market performance.
Life of Fund returns are measured from the date the Fund’s shares were first sold (September 30, 2014).
For periods prior to the inception date of Class R-6 shares (August 24, 2015) and Class J shares (March 1, 2018), the performance shown in the table for these newer classes is that of the Fund’s Institutional Class shares, adjusted to reflect the respective fees and expenses of each class. These adjustments result in performance for such periods that is no higher than the historical performance of the Institutional Class shares, which were first sold on September 30, 2014.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following information provides some indication of the risks of investing in the Fund.
Performance Additional Market Index [Text] rr_PerformanceAdditionalMarketIndex The S&P Target Date 2030 Index is included as an additional index for the Fund as it shows how the Fund’s performance compares with the returns of an index of funds with similar investment objectives.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.PrincipalAM.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.
Bar Chart [Heading] rr_BarChartHeading Total Returns as of December 31
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
Highest return for a quarter during the period of the bar chart above:Q2 202014.20 %
Lowest return for a quarter during the period of the bar chart above:Q1 2020(14.39)%
Performance Table Heading rr_PerformanceTableHeading Average Annual Total ReturnsFor the periods ended December 31, 2023
Performance Table Market Index Changed rr_PerformanceTableMarketIndexChanged Effective March 1, 2024, the Fund changed its primary broad-based index to the S&P 1500 TR in order to meet the revised definition of “broad-based securities market index.”
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are shown for Institutional Class shares only and would be different for the other share classes.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock
After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. After-tax returns are shown for Institutional Class shares only and would be different for the other share classes.
Effective March 1, 2024, the Fund changed its primary broad-based index to the S&P 1500 TR in order to meet the revised definition of “broad-based securities market index.” The S&P Target Date 2030 Index is included as an additional index for the Fund as it shows how the Fund’s performance compares with the returns of an index of funds with similar investment objectives.
PFI Prospectus | Principal LifeTime Hybrid 2030 Fund | Risk Lose Money [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Many factors affect that value, and it is possible to lose money by investing in the Fund.
PFI Prospectus | Principal LifeTime Hybrid 2030 Fund | Risk Not Insured Depository Institution [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
PFI Prospectus | Principal LifeTime Hybrid 2030 Fund | Counterparty Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Counterparty Risk. Counterparty risk is the risk that the counterparty to a contract or other obligation will be unable or unwilling to honor its obligations.
PFI Prospectus | Principal LifeTime Hybrid 2030 Fund | Derivatives Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Derivatives Risk. Derivatives may not move in the direction anticipated by the portfolio manager. Transactions in derivatives may increase volatility, cause the liquidation of portfolio positions when not advantageous to do so, and result in disproportionate losses that may be substantially greater than a fund’s initial investment.
•Credit Default Swaps. Credit default swaps involve special risks in addition to those associated with swaps generally because they are difficult to value, are highly susceptible to liquidity and credit risk, and generally pay a return to the party that has paid the premium only in the event of an actual default by the issuer of the underlying obligation (as opposed to a credit downgrade or other indication of financial difficulty). The protection “buyer” in a credit default contract may be obligated to pay the protection “seller” an up-front payment or a periodic stream of payments over the term of the contract, provided, generally, that no credit event on a reference obligation has occurred. If a credit event occurs, the seller generally must pay the buyer the “par value” (i.e., full notional value) of the swap in exchange for an equal face amount of deliverable obligations of the reference entity described in the swap, or the seller may be required to deliver the related net cash amount, if the swap is cash settled. The Fund may be either the buyer or seller in the transaction.
•Forward Contracts, Futures, and Swaps. Forward contracts, futures, and swaps involve specific risks, including: the imperfect correlation between the change in market value of the instruments held by the fund and the price of the forward contract, future, or swap; possible lack of a liquid secondary market for a forward contract, future, or swap and the resulting inability to close a forward contract, future, or swap when desired; counterparty risk; and if the fund has insufficient cash, it may have to sell securities from its portfolio to meet daily variation margin requirements.
•Options. Options involve specific risks, including: the imperfect correlation between the change in market value of the instruments held by the Fund and the price of the options; counterparty risk; difference in trading hours for the options markets and the markets for the underlying securities (rate movements can take place in the underlying markets that cannot be reflected in the options markets); and an insufficient liquid secondary market for particular options.
PFI Prospectus | Principal LifeTime Hybrid 2030 Fund | Derivatives Risk, Credit Default Swaps Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Credit Default Swaps. Credit default swaps involve special risks in addition to those associated with swaps generally because they are difficult to value, are highly susceptible to liquidity and credit risk, and generally pay a return to the party that has paid the premium only in the event of an actual default by the issuer of the underlying obligation (as opposed to a credit downgrade or other indication of financial difficulty). The protection “buyer” in a credit default contract may be obligated to pay the protection “seller” an up-front payment or a periodic stream of payments over the term of the contract, provided, generally, that no credit event on a reference obligation has occurred. If a credit event occurs, the seller generally must pay the buyer the “par value” (i.e., full notional value) of the swap in exchange for an equal face amount of deliverable obligations of the reference entity described in the swap, or the seller may be required to deliver the related net cash amount, if the swap is cash settled. The Fund may be either the buyer or seller in the transaction.
PFI Prospectus | Principal LifeTime Hybrid 2030 Fund | Derivatives Risk, Forward Contracts, Futures, And Swaps Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Forward Contracts, Futures, and Swaps. Forward contracts, futures, and swaps involve specific risks, including: the imperfect correlation between the change in market value of the instruments held by the fund and the price of the forward contract, future, or swap; possible lack of a liquid secondary market for a forward contract, future, or swap and the resulting inability to close a forward contract, future, or swap when desired; counterparty risk; and if the fund has insufficient cash, it may have to sell securities from its portfolio to meet daily variation margin requirements.
PFI Prospectus | Principal LifeTime Hybrid 2030 Fund | Derivatives Risk, Options Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Options. Options involve specific risks, including: the imperfect correlation between the change in market value of the instruments held by the Fund and the price of the options; counterparty risk; difference in trading hours for the options markets and the markets for the underlying securities (rate movements can take place in the underlying markets that cannot be reflected in the options markets); and an insufficient liquid secondary market for particular options.
PFI Prospectus | Principal LifeTime Hybrid 2030 Fund | Equity Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Equity Securities Risk. A variety of factors can negatively impact the value of equity securities held by a fund, including a decline in the issuer’s financial condition, unfavorable performance of the issuer’s sector or industry, or changes in response to overall market and economic conditions. A fund’s principal market segment(s) (such as market capitalization or style) may underperform other market segments or the equity markets as a whole.
•Growth Style Risk. Growth investing entails the risk that if growth companies do not increase their earnings at a rate expected by investors, the market price of their stock may decline significantly, even if earnings show an absolute increase. Growth company stocks also typically lack the dividend yield that can lessen price declines in market downturns.
•Smaller Companies Risk. Investments in smaller companies may involve greater risk and price volatility than investments in larger, more mature companies. Smaller companies may have limited product lines, markets, or financial resources; lack the competitive strength of larger companies; have less experienced managers; or depend on a few key employees. Their securities often are less widely held and trade less frequently and in lesser quantities, and their market prices often fluctuate more, than securities of larger companies.
•Value Style Risk. Value investing entails the risk that value stocks may continue to be undervalued by the market for extended periods, including the entire period during which the stock is held by a fund, or the events that would cause the stock price to increase may not occur as anticipated or at all. Moreover, a stock that appears to be undervalued actually may be appropriately priced at a low level and, therefore, would not be profitable for the fund.
PFI Prospectus | Principal LifeTime Hybrid 2030 Fund | Equity Securities Risk, Growth Style Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Growth Style Risk. Growth investing entails the risk that if growth companies do not increase their earnings at a rate expected by investors, the market price of their stock may decline significantly, even if earnings show an absolute increase. Growth company stocks also typically lack the dividend yield that can lessen price declines in market downturns.
PFI Prospectus | Principal LifeTime Hybrid 2030 Fund | Equity Securities Risk, Smaller Companies Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Smaller Companies Risk. Investments in smaller companies may involve greater risk and price volatility than investments in larger, more mature companies. Smaller companies may have limited product lines, markets, or financial resources; lack the competitive strength of larger companies; have less experienced managers; or depend on a few key employees. Their securities often are less widely held and trade less frequently and in lesser quantities, and their market prices often fluctuate more, than securities of larger companies.
PFI Prospectus | Principal LifeTime Hybrid 2030 Fund | Equity Securities Risk, Value Style Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Value Style Risk. Value investing entails the risk that value stocks may continue to be undervalued by the market for extended periods, including the entire period during which the stock is held by a fund, or the events that would cause the stock price to increase may not occur as anticipated or at all. Moreover, a stock that appears to be undervalued actually may be appropriately priced at a low level and, therefore, would not be profitable for the fund.
PFI Prospectus | Principal LifeTime Hybrid 2030 Fund | Fixed-Income Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Fixed-Income Securities Risk. Fixed-income securities are subject to interest rate, credit quality, and liquidity risks. The market value of fixed-income securities generally declines when interest rates rise, and increased interest rates may adversely affect the liquidity of certain fixed-income securities. Moreover, an issuer of fixed-income securities could default on its payment obligations due to increased interest rates or for other reasons.
PFI Prospectus | Principal LifeTime Hybrid 2030 Fund | Foreign Currency Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Foreign Currency Risk. Risks of investing in securities denominated in, or that trade in, foreign (non-U.S.) currencies include changes in foreign exchange rates and foreign exchange restrictions.
PFI Prospectus | Principal LifeTime Hybrid 2030 Fund | Foreign Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Foreign Securities Risk. The risks of foreign securities include loss of value as a result of: political or economic instability; nationalization, expropriation, or confiscatory taxation; settlement delays; and limited government regulation (including less stringent reporting, accounting, and disclosure standards than are required of U.S. companies).
PFI Prospectus | Principal LifeTime Hybrid 2030 Fund | Fund Of Funds Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Fund of Funds Risk. Fund shareholders bear indirectly their proportionate share of the expenses of other investment companies (for example, other mutual funds or exchange-traded funds) in which the Fund invests (“underlying funds”). The Fund’s selection and weighting of asset classes and allocation of investments in underlying funds may cause it to underperform other funds with a similar investment objective. The Fund’s performance and risks correspond directly to the performance and risks of the underlying funds in which it invests, proportionately in accordance with the weightings of such investments, and there is no assurance that the underlying funds will achieve their investment objectives. Management of the Fund entails potential conflicts of interest: the Fund invests in affiliated underlying funds; and PGI and its affiliates may earn different fees from different underlying funds and may have an incentive to allocate more Fund assets to underlying funds from which they receive higher fees.
PFI Prospectus | Principal LifeTime Hybrid 2030 Fund | Index Fund Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Index Fund Risk. Index funds use a passive investment approach and generally do not attempt to manage market volatility, use defensive strategies, or reduce the effect of any long-term periods of poor investment performance. Therefore, the Fund may hold securities that present risks that an investment advisor researching individual securities might seek to avoid. An index fund has operating and other expenses while an index does not. As a result, over time, index funds tend to underperform the index. The correlation between fund performance and index performance may also be affected by the type of passive investment approach used by a fund (sampling or replication), changes in securities markets, changes in the composition of the index, and the timing of purchases and sales of fund shares. Errors or delays in compiling or rebalancing the Index may impact the performance of the Fund and increase transaction costs.
PFI Prospectus | Principal LifeTime Hybrid 2030 Fund | Portfolio Duration Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Portfolio Duration Risk. Portfolio duration is a measure of the expected life of a fixed-income security and its sensitivity to changes in interest rates. The longer a fund’s average portfolio duration, the more sensitive the fund will be to changes in interest rates, which means funds with longer average portfolio durations may be more volatile than those with shorter durations.
PFI Prospectus | Principal LifeTime Hybrid 2030 Fund | Redemption And Large Transaction Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Redemption and Large Transaction Risk. Ownership of the Fund’s shares may be concentrated in one or a few large investors (such as funds of funds, institutional investors, and asset allocation programs) that may redeem or purchase shares in large quantities. These transactions may cause the Fund to sell securities to meet redemptions or to invest additional cash at times it would not otherwise do so, which may result in increased transaction costs, increased expenses, changes to expense ratios, and adverse effects to Fund performance. Such transactions may also accelerate the realization of taxable income if sales of portfolio securities result in gains. Moreover, reallocations by large shareholders among share classes of a fund may result in changes to the expense ratios of affected classes, which may increase the expenses paid by shareholders of the class that experienced the redemption.
PFI Prospectus | Principal LifeTime Hybrid 2030 Fund | Securitized Products Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Securitized Products Risk. Investments in securitized products are subject to risks similar to traditional fixed-income securities, such as credit, interest rate, liquidity, prepayment, extension, and default risk, as well as additional risks associated with the nature of the assets and the servicing of those assets. Unscheduled prepayments on securitized products may have to be reinvested at lower rates. A reduction in prepayments may increase the effective maturities of these securities, exposing them to the risk of decline in market value over time (extension risk).
PFI Prospectus | Principal LifeTime Hybrid 2030 Fund | Target Date Fund Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Target Date Fund Risk. A target date fund should not be selected based solely on age or retirement date because there is no guarantee that this Fund will provide adequate income at or through retirement.
PFI Prospectus | Principal LifeTime Hybrid 2030 Fund | U.S. Government Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
U.S. Government Securities Risk. Yields available from U.S. government securities are generally lower than yields from many other fixed-income securities. The value of U.S. government securities may be adversely impacted by changes in interest rates, changes in the credit rating of the U.S. government, or a default by the U.S. government.
PFI Prospectus | Principal LifeTime Hybrid 2030 Fund | U.S. Government-Sponsored Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
U.S. Government-Sponsored Securities Risk. Securities issued by U.S. government-sponsored enterprises such as the Federal Home Loan Mortgage Corporation, the Federal National Mortgage Association, and the Federal Home Loan Banks are not issued or guaranteed by the U.S. government.
PFI Prospectus | Principal LifeTime Hybrid 2030 Fund | S&P 1500 TR (reflects no deduction for fees, expenses, or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
Label rr_AverageAnnualReturnLabel S&P 1500 TR (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 25.47%
5 Years rr_AverageAnnualReturnYear05 15.39%
Since Inception rr_AverageAnnualReturnSinceInception 11.85%
PFI Prospectus | Principal LifeTime Hybrid 2030 Fund | S&P Target Date 2030 Index (reflects no deduction for fees, expenses, or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
Label rr_AverageAnnualReturnLabel S&P Target Date 2030 Index (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 14.80%
5 Years rr_AverageAnnualReturnYear05 8.42%
Since Inception rr_AverageAnnualReturnSinceInception 6.54%
PFI Prospectus | Principal LifeTime Hybrid 2030 Fund | Class J  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PHJNX
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.15%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.03%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.31%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.49%
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.49%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 150
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 157
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 274
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 616
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 50
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 157
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 274
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 616
Label rr_AverageAnnualReturnLabel Class J Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 13.86%
5 Years rr_AverageAnnualReturnYear05 8.44%
Since Inception rr_AverageAnnualReturnSinceInception 6.46%
PFI Prospectus | Principal LifeTime Hybrid 2030 Fund | Institutional Class  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PHTNX
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.07%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.31%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.38%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.02%) [44]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.36%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 37
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 120
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 211
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 478
Annual Return 2015 rr_AnnualReturn2015 (0.18%)
Annual Return 2016 rr_AnnualReturn2016 7.89%
Annual Return 2017 rr_AnnualReturn2017 16.81%
Annual Return 2018 rr_AnnualReturn2018 (7.30%)
Annual Return 2019 rr_AnnualReturn2019 20.91%
Annual Return 2020 rr_AnnualReturn2020 14.73%
Annual Return 2021 rr_AnnualReturn2021 13.91%
Annual Return 2022 rr_AnnualReturn2022 (16.75%)
Annual Return 2023 rr_AnnualReturn2023 14.93%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Highest return for a quarter during the period of the bar chart above:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 14.20%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Lowest return for a quarter during the period of the bar chart above:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (14.39%)
Label rr_AverageAnnualReturnLabel Institutional Class Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 14.93%
5 Years rr_AverageAnnualReturnYear05 8.62%
Since Inception rr_AverageAnnualReturnSinceInception 6.68%
PFI Prospectus | Principal LifeTime Hybrid 2030 Fund | Institutional Class | After Taxes on Distributions  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Institutional Class Return After Taxes on Distributions
1 Year rr_AverageAnnualReturnYear01 13.69%
5 Years rr_AverageAnnualReturnYear05 7.12%
Since Inception rr_AverageAnnualReturnSinceInception 5.39%
PFI Prospectus | Principal LifeTime Hybrid 2030 Fund | Institutional Class | After Taxes on Distributions and Sales  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Institutional Class Return After Taxes on Distributions and Sale of Fund Shares
1 Year rr_AverageAnnualReturnYear01 9.15%
5 Years rr_AverageAnnualReturnYear05 6.46%
Since Inception rr_AverageAnnualReturnSinceInception 4.97%
PFI Prospectus | Principal LifeTime Hybrid 2030 Fund | Class R-6  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PLZTX
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.02%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.31%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.33%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets none [44]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.33%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 34
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 106
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 185
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 418
Label rr_AverageAnnualReturnLabel Class R-6 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 14.98%
5 Years rr_AverageAnnualReturnYear05 8.66%
Since Inception rr_AverageAnnualReturnSinceInception 6.70%
PFI Prospectus | Principal LifeTime Hybrid 2035 Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading PRINCIPAL LIFETIME HYBRID 2035 FUND
Objective [Heading] rr_ObjectiveHeading Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The Fund seeks a total return consisting of long-term growth of capital and current income.
Expense [Heading] rr_ExpenseHeading Fees and Expenses of the Fund
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock
This table describes the fees and expenses that you may pay if you buy, hold, and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below.
If you purchase Institutional Class or Class R-6 shares through certain programs offered by certain financial intermediaries, you may be required to pay a commission and/or other forms of compensation to the broker, or to your Financial Professional or other financial intermediary.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder Fees (fees paid directly from your investment)
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination February 28, 2025
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock
The Fund and each underlying fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs. These costs, which are not reflected in Annual Fund Operating Expenses or in the Example, affect the Fund’s and the underlying funds' performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 13.1% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 13.10%
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. The calculation of costs takes into account any applicable contractual fee waivers and/or expense reimbursements for the period noted in the table above. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, No Redemption, By Year, Caption [Text] rr_ExpenseExampleNoRedemptionByYearCaption With respect to Class J shares, you would pay the following expenses if you did not redeem your shares (all other classes would be the same as in the above example):
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
The Fund operates as a “target date fund” that invests according to an asset allocation strategy designed for investors having a retirement investment goal close to the year in the Fund’s name. The Fund is a fund of funds that invests in underlying funds of Principal Funds, Inc. (“PFI”), with a majority of the Fund’s assets invested in index funds. Its underlying funds consist of domestic and foreign equity funds, fixed-income funds, real asset funds, and other funds that aim to offer diversification beyond traditional equity and fixed-income securities. The asset class diversification of the Fund is designed to moderate overall price volatility. The Fund may add, remove, or substitute underlying funds at any time.
The Fund is managed with strategic or long-term asset class targets and target ranges. There is a rebalancing strategy that aligns with the target weights to identify asset classes that are either overweight or underweight. The Fund may shift asset class targets in response to normal evaluative processes, the shortening time horizon of the Fund, or changes in market forces or Fund circumstances.
In selecting underlying funds and target weights, the Fund considers both quantitative measures (e.g., past performance, expected levels of risk and returns, expense levels, diversification, and style consistency) and qualitative factors (e.g., organizational stability, investment experience, investment and risk management processes, and information, trading, and compliance systems). There are no minimum or maximum percentages of assets that the Fund must invest in a specific asset class or underlying fund.
The underlying funds invest in growth and value stocks of small, medium, and large market capitalization companies, fixed-income securities, domestic and foreign securities, securities denominated in foreign currencies, investment companies (including index funds), U.S. government and U.S. government-sponsored securities, and derivatives. A derivative is a financial arrangement, the value of which is derived from, or based on, a traditional security, asset, or market index. The underlying funds principally use equity index futures and options in order to gain exposure to a variety of securities or asset classes or attempt to reduce risk.
The Fund’s asset allocation will become more conservative over time as investment goals near (for example, retirement, which is assumed to begin at age 65) and investors become more risk-averse. Approximately 10 years after its target year, the Fund’s underlying fund allocation is expected to match that of the Principal LifeTime Hybrid Income Fund. At that time, the Fund may be combined with the Principal LifeTime Hybrid Income Fund if the Board of Directors determines that the combination is in the best interests of Fund shareholders. It is expected that at the target date in the Fund’s name, the shareholder will begin gradually withdrawing the account’s value.
LT Hybrid Glidepath.jpg
Risk [Heading] rr_RiskHeading Principal Risks
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
The following information provides some indication of the risks of investing in the Fund. Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. You may get updated performance information at www.PrincipalAM.com.
The bar chart shows the investment returns of the Fund’s Institutional Class shares for each full calendar year of operations for 10 years (or, if shorter, the life of the Fund). The table shows for the last one, five, and ten calendar year periods (or, if shorter, the life of the Fund), how the Fund’s average annual total returns compare with those of one or more broad measures of market performance.
Life of Fund returns are measured from the date the Fund’s shares were first sold (September 30, 2014).
For periods prior to the inception date of Class R-6 shares (August 24, 2015) and Class J shares (March 1, 2018), the performance shown in the table for these newer classes is that of the Fund’s Institutional Class shares, adjusted to reflect the respective fees and expenses of each class. These adjustments result in performance for such periods that is no higher than the historical performance of the Institutional Class shares, which were first sold on September 30, 2014.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following information provides some indication of the risks of investing in the Fund.
Performance Additional Market Index [Text] rr_PerformanceAdditionalMarketIndex The S&P Target Date 2035 Index is included as an additional index for the Fund as it shows how the Fund’s performance compares with the returns of an index of funds with similar investment objectives.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.PrincipalAM.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.
Bar Chart [Heading] rr_BarChartHeading Total Returns as of December 31
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
Highest return for a quarter during the period of the bar chart above:Q2 202015.37 %
Lowest return for a quarter during the period of the bar chart above:Q1 2020(16.18)%
Performance Table Heading rr_PerformanceTableHeading Average Annual Total ReturnsFor the periods ended December 31, 2023
Performance Table Market Index Changed rr_PerformanceTableMarketIndexChanged Effective March 1, 2024, the Fund changed its primary broad-based index to the S&P 1500 TR in order to meet the revised definition of “broad-based securities market index.”
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are shown for Institutional Class shares only and would be different for the other share classes.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock
After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. After-tax returns are shown for Institutional Class shares only and would be different for the other share classes.
Effective March 1, 2024, the Fund changed its primary broad-based index to the S&P 1500 TR in order to meet the revised definition of “broad-based securities market index.” The S&P Target Date 2035 Index is included as an additional index for the Fund as it shows how the Fund’s performance compares with the returns of an index of funds with similar investment objectives.
PFI Prospectus | Principal LifeTime Hybrid 2035 Fund | Risk Lose Money [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Many factors affect that value, and it is possible to lose money by investing in the Fund.
PFI Prospectus | Principal LifeTime Hybrid 2035 Fund | Risk Not Insured Depository Institution [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
PFI Prospectus | Principal LifeTime Hybrid 2035 Fund | Counterparty Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Counterparty Risk. Counterparty risk is the risk that the counterparty to a contract or other obligation will be unable or unwilling to honor its obligations.
PFI Prospectus | Principal LifeTime Hybrid 2035 Fund | Derivatives Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Derivatives Risk. Derivatives may not move in the direction anticipated by the portfolio manager. Transactions in derivatives may increase volatility, cause the liquidation of portfolio positions when not advantageous to do so, and result in disproportionate losses that may be substantially greater than a fund’s initial investment.
•Futures. Futures contracts involve specific risks, including: the imperfect correlation between the change in market value of the instruments held by the Fund and the price of the futures contract; possible lack of a liquid secondary market for a futures contract and the resulting inability to close a futures contract when desired; counterparty risk; and if the Fund has insufficient cash, it may have to sell securities from its portfolio to meet daily variation margin requirements.
•Options. Options involve specific risks, including: the imperfect correlation between the change in market value of the instruments held by the Fund and the price of the options; counterparty risk; difference in trading hours for the options markets and the markets for the underlying securities (rate movements can take place in the underlying markets that cannot be reflected in the options markets); and an insufficient liquid secondary market for particular options.
PFI Prospectus | Principal LifeTime Hybrid 2035 Fund | Derivatives Risk, Futures Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Futures. Futures contracts involve specific risks, including: the imperfect correlation between the change in market value of the instruments held by the Fund and the price of the futures contract; possible lack of a liquid secondary market for a futures contract and the resulting inability to close a futures contract when desired; counterparty risk; and if the Fund has insufficient cash, it may have to sell securities from its portfolio to meet daily variation margin requirements.
PFI Prospectus | Principal LifeTime Hybrid 2035 Fund | Derivatives Risk, Options Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Options. Options involve specific risks, including: the imperfect correlation between the change in market value of the instruments held by the Fund and the price of the options; counterparty risk; difference in trading hours for the options markets and the markets for the underlying securities (rate movements can take place in the underlying markets that cannot be reflected in the options markets); and an insufficient liquid secondary market for particular options.
PFI Prospectus | Principal LifeTime Hybrid 2035 Fund | Equity Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Equity Securities Risk. A variety of factors can negatively impact the value of equity securities held by a fund, including a decline in the issuer’s financial condition, unfavorable performance of the issuer’s sector or industry, or changes in response to overall market and economic conditions. A fund’s principal market segment(s) (such as market capitalization or style) may underperform other market segments or the equity markets as a whole.
•Growth Style Risk. Growth investing entails the risk that if growth companies do not increase their earnings at a rate expected by investors, the market price of their stock may decline significantly, even if earnings show an absolute increase. Growth company stocks also typically lack the dividend yield that can lessen price declines in market downturns.
•Smaller Companies Risk. Investments in smaller companies may involve greater risk and price volatility than investments in larger, more mature companies. Smaller companies may have limited product lines, markets, or financial resources; lack the competitive strength of larger companies; have less experienced managers; or depend on a few key employees. Their securities often are less widely held and trade less frequently and in lesser quantities, and their market prices often fluctuate more, than securities of larger companies.
•Value Style Risk. Value investing entails the risk that value stocks may continue to be undervalued by the market for extended periods, including the entire period during which the stock is held by a fund, or the events that would cause the stock price to increase may not occur as anticipated or at all. Moreover, a stock that appears to be undervalued actually may be appropriately priced at a low level and, therefore, would not be profitable for the fund.
PFI Prospectus | Principal LifeTime Hybrid 2035 Fund | Equity Securities Risk, Growth Style Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Growth Style Risk. Growth investing entails the risk that if growth companies do not increase their earnings at a rate expected by investors, the market price of their stock may decline significantly, even if earnings show an absolute increase. Growth company stocks also typically lack the dividend yield that can lessen price declines in market downturns.
PFI Prospectus | Principal LifeTime Hybrid 2035 Fund | Equity Securities Risk, Smaller Companies Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Smaller Companies Risk. Investments in smaller companies may involve greater risk and price volatility than investments in larger, more mature companies. Smaller companies may have limited product lines, markets, or financial resources; lack the competitive strength of larger companies; have less experienced managers; or depend on a few key employees. Their securities often are less widely held and trade less frequently and in lesser quantities, and their market prices often fluctuate more, than securities of larger companies.
PFI Prospectus | Principal LifeTime Hybrid 2035 Fund | Equity Securities Risk, Value Style Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Value Style Risk. Value investing entails the risk that value stocks may continue to be undervalued by the market for extended periods, including the entire period during which the stock is held by a fund, or the events that would cause the stock price to increase may not occur as anticipated or at all. Moreover, a stock that appears to be undervalued actually may be appropriately priced at a low level and, therefore, would not be profitable for the fund.
PFI Prospectus | Principal LifeTime Hybrid 2035 Fund | Fixed-Income Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Fixed-Income Securities Risk. Fixed-income securities are subject to interest rate, credit quality, and liquidity risks. The market value of fixed-income securities generally declines when interest rates rise, and increased interest rates may adversely affect the liquidity of certain fixed-income securities. Moreover, an issuer of fixed-income securities could default on its payment obligations due to increased interest rates or for other reasons.
PFI Prospectus | Principal LifeTime Hybrid 2035 Fund | Foreign Currency Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Foreign Currency Risk. Risks of investing in securities denominated in, or that trade in, foreign (non-U.S.) currencies include changes in foreign exchange rates and foreign exchange restrictions.
PFI Prospectus | Principal LifeTime Hybrid 2035 Fund | Foreign Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Foreign Securities Risk. The risks of foreign securities include loss of value as a result of: political or economic instability; nationalization, expropriation, or confiscatory taxation; settlement delays; and limited government regulation (including less stringent reporting, accounting, and disclosure standards than are required of U.S. companies).
PFI Prospectus | Principal LifeTime Hybrid 2035 Fund | Fund Of Funds Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Fund of Funds Risk. Fund shareholders bear indirectly their proportionate share of the expenses of other investment companies (for example, other mutual funds or exchange-traded funds) in which the Fund invests (“underlying funds”). The Fund’s selection and weighting of asset classes and allocation of investments in underlying funds may cause it to underperform other funds with a similar investment objective. The Fund’s performance and risks correspond directly to the performance and risks of the underlying funds in which it invests, proportionately in accordance with the weightings of such investments, and there is no assurance that the underlying funds will achieve their investment objectives. Management of the Fund entails potential conflicts of interest: the Fund invests in affiliated underlying funds; and PGI and its affiliates may earn different fees from different underlying funds and may have an incentive to allocate more Fund assets to underlying funds from which they receive higher fees.
PFI Prospectus | Principal LifeTime Hybrid 2035 Fund | Index Fund Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Index Fund Risk. Index funds use a passive investment approach and generally do not attempt to manage market volatility, use defensive strategies, or reduce the effect of any long-term periods of poor investment performance. Therefore, the Fund may hold securities that present risks that an investment advisor researching individual securities might seek to avoid. An index fund has operating and other expenses while an index does not. As a result, over time, index funds tend to underperform the index. The correlation between fund performance and index performance may also be affected by the type of passive investment approach used by a fund (sampling or replication), changes in securities markets, changes in the composition of the index, and the timing of purchases and sales of fund shares. Errors or delays in compiling or rebalancing the Index may impact the performance of the Fund and increase transaction costs.
PFI Prospectus | Principal LifeTime Hybrid 2035 Fund | Portfolio Duration Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Portfolio Duration Risk. Portfolio duration is a measure of the expected life of a fixed-income security and its sensitivity to changes in interest rates. The longer a fund’s average portfolio duration, the more sensitive the fund will be to changes in interest rates, which means funds with longer average portfolio durations may be more volatile than those with shorter durations.
PFI Prospectus | Principal LifeTime Hybrid 2035 Fund | Redemption And Large Transaction Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Redemption and Large Transaction Risk. Ownership of the Fund’s shares may be concentrated in one or a few large investors (such as funds of funds, institutional investors, and asset allocation programs) that may redeem or purchase shares in large quantities. These transactions may cause the Fund to sell securities to meet redemptions or to invest additional cash at times it would not otherwise do so, which may result in increased transaction costs, increased expenses, changes to expense ratios, and adverse effects to Fund performance. Such transactions may also accelerate the realization of taxable income if sales of portfolio securities result in gains. Moreover, reallocations by large shareholders among share classes of a fund may result in changes to the expense ratios of affected classes, which may increase the expenses paid by shareholders of the class that experienced the redemption.
PFI Prospectus | Principal LifeTime Hybrid 2035 Fund | Securitized Products Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Securitized Products Risk. Investments in securitized products are subject to risks similar to traditional fixed-income securities, such as credit, interest rate, liquidity, prepayment, extension, and default risk, as well as additional risks associated with the nature of the assets and the servicing of those assets. Unscheduled prepayments on securitized products may have to be reinvested at lower rates. A reduction in prepayments may increase the effective maturities of these securities, exposing them to the risk of decline in market value over time (extension risk).
PFI Prospectus | Principal LifeTime Hybrid 2035 Fund | Target Date Fund Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Target Date Fund Risk. A target date fund should not be selected based solely on age or retirement date because there is no guarantee that this Fund will provide adequate income at or through retirement.
PFI Prospectus | Principal LifeTime Hybrid 2035 Fund | U.S. Government Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
U.S. Government Securities Risk. Yields available from U.S. government securities are generally lower than yields from many other fixed-income securities. The value of U.S. government securities may be adversely impacted by changes in interest rates, changes in the credit rating of the U.S. government, or a default by the U.S. government.
PFI Prospectus | Principal LifeTime Hybrid 2035 Fund | U.S. Government-Sponsored Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
U.S. Government-Sponsored Securities Risk. Securities issued by U.S. government-sponsored enterprises such as the Federal Home Loan Mortgage Corporation, the Federal National Mortgage Association, and the Federal Home Loan Banks are not issued or guaranteed by the U.S. government.
PFI Prospectus | Principal LifeTime Hybrid 2035 Fund | S&P 1500 TR (reflects no deduction for fees, expenses, or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
Label rr_AverageAnnualReturnLabel S&P 1500 TR (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 25.47%
5 Years rr_AverageAnnualReturnYear05 15.39%
Since Inception rr_AverageAnnualReturnSinceInception 11.85%
PFI Prospectus | Principal LifeTime Hybrid 2035 Fund | S&P Target Date 2035 Index (reflects no deduction for fees, expenses, or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
Label rr_AverageAnnualReturnLabel S&P Target Date 2035 Index (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 16.63%
5 Years rr_AverageAnnualReturnYear05 9.44%
Since Inception rr_AverageAnnualReturnSinceInception 7.18%
PFI Prospectus | Principal LifeTime Hybrid 2035 Fund | Class J  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PHJJX
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.15%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.04%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.33%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.52%
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.52%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 153
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 167
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 291
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 653
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 53
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 167
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 291
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 653
Label rr_AverageAnnualReturnLabel Class J Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 15.39%
5 Years rr_AverageAnnualReturnYear05 9.27%
Since Inception rr_AverageAnnualReturnSinceInception 7.01%
PFI Prospectus | Principal LifeTime Hybrid 2035 Fund | Institutional Class  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PHTJX
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.08%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.33%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.41%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.03%) [45]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.38%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 39
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 129
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 227
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 515
Annual Return 2015 rr_AnnualReturn2015 (0.19%)
Annual Return 2016 rr_AnnualReturn2016 8.31%
Annual Return 2017 rr_AnnualReturn2017 18.14%
Annual Return 2018 rr_AnnualReturn2018 (7.99%)
Annual Return 2019 rr_AnnualReturn2019 22.68%
Annual Return 2020 rr_AnnualReturn2020 15.12%
Annual Return 2021 rr_AnnualReturn2021 15.60%
Annual Return 2022 rr_AnnualReturn2022 (17.36%)
Annual Return 2023 rr_AnnualReturn2023 16.47%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Highest return for a quarter during the period of the bar chart above:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 15.37%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Lowest return for a quarter during the period of the bar chart above:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (16.18%)
Label rr_AverageAnnualReturnLabel Institutional Class Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 16.47%
5 Years rr_AverageAnnualReturnYear05 9.46%
Since Inception rr_AverageAnnualReturnSinceInception 7.23%
PFI Prospectus | Principal LifeTime Hybrid 2035 Fund | Institutional Class | After Taxes on Distributions  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Institutional Class Return After Taxes on Distributions
1 Year rr_AverageAnnualReturnYear01 15.28%
5 Years rr_AverageAnnualReturnYear05 8.03%
Since Inception rr_AverageAnnualReturnSinceInception 6.00%
PFI Prospectus | Principal LifeTime Hybrid 2035 Fund | Institutional Class | After Taxes on Distributions and Sales  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Institutional Class Return After Taxes on Distributions and Sale of Fund Shares
1 Year rr_AverageAnnualReturnYear01 10.12%
5 Years rr_AverageAnnualReturnYear05 7.19%
Since Inception rr_AverageAnnualReturnSinceInception 5.47%
PFI Prospectus | Principal LifeTime Hybrid 2035 Fund | Class R-6  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PLRTX
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.02%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.33%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.35%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets none [45]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.35%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 36
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 113
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 197
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 443
Label rr_AverageAnnualReturnLabel Class R-6 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 16.47%
5 Years rr_AverageAnnualReturnYear05 9.50%
Since Inception rr_AverageAnnualReturnSinceInception 7.27%
PFI Prospectus | Principal LifeTime Hybrid 2040 Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading PRINCIPAL LIFETIME HYBRID 2040 FUND
Objective [Heading] rr_ObjectiveHeading Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The Fund seeks a total return consisting of long-term growth of capital and current income.
Expense [Heading] rr_ExpenseHeading Fees and Expenses of the Fund
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock
This table describes the fees and expenses that you may pay if you buy, hold, and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below.
If you purchase Institutional Class or Class R-6 shares through certain programs offered by certain financial intermediaries, you may be required to pay a commission and/or other forms of compensation to the broker, or to your Financial Professional or other financial intermediary.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder Fees (fees paid directly from your investment)
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination February 28, 2025
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock
The Fund and each underlying fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs. These costs, which are not reflected in Annual Fund Operating Expenses or in the Example, affect the Fund’s and the underlying funds' performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 10.8% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 10.80%
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. The calculation of costs takes into account any applicable contractual fee waivers and/or expense reimbursements for the period noted in the table above. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, No Redemption, By Year, Caption [Text] rr_ExpenseExampleNoRedemptionByYearCaption With respect to Class J shares, you would pay the following expenses if you did not redeem your shares (all other classes would be the same as in the above example):
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
The Fund operates as a “target date fund” that invests according to an asset allocation strategy designed for investors having a retirement investment goal close to the year in the Fund’s name. The Fund is a fund of funds that invests in underlying funds of Principal Funds, Inc. (“PFI”), with a majority of the Fund’s assets invested in index funds. Its underlying funds consist of domestic and foreign equity funds, fixed-income funds, real asset funds, and other funds that aim to offer diversification beyond traditional equity and fixed-income securities. The asset class diversification of the Fund is designed to moderate overall price volatility. The Fund may add, remove, or substitute underlying funds at any time.
The Fund is managed with strategic or long-term asset class targets and target ranges. There is a rebalancing strategy that aligns with the target weights to identify asset classes that are either overweight or underweight. The Fund may shift asset class targets in response to normal evaluative processes, the shortening time horizon of the Fund, or changes in market forces or Fund circumstances.
In selecting underlying funds and target weights, the Fund considers both quantitative measures (e.g., past performance, expected levels of risk and returns, expense levels, diversification, and style consistency) and qualitative factors (e.g., organizational stability, investment experience, investment and risk management processes, and information, trading, and compliance systems). There are no minimum or maximum percentages of assets that the Fund must invest in a specific asset class or underlying fund.
The underlying funds invest in growth and value stocks of small, medium, and large market capitalization companies, fixed-income securities, domestic and foreign (including those in emerging markets) securities, securities denominated in foreign currencies, investment companies (including index funds), U.S. government and U.S. government-sponsored securities, and derivatives. A derivative is a financial arrangement, the value of which is derived from, or based on, a traditional security, asset, or market index. The underlying funds principally use equity index futures and options in order to gain exposure to a variety of securities or asset classes or attempt to reduce risk.
The Fund’s asset allocation will become more conservative over time as investment goals near (for example, retirement, which is assumed to begin at age 65) and investors become more risk-averse. Approximately 10 years after its target year, the Fund’s underlying fund allocation is expected to match that of the Principal LifeTime Hybrid Income Fund. At that time, the Fund may be combined with the Principal LifeTime Hybrid Income Fund if the Board of Directors determines that the combination is in the best interests of Fund shareholders. It is expected that at the target date in the Fund’s name, the shareholder will begin gradually withdrawing the account’s value.
LT Hybrid Glidepath.jpg
Risk [Heading] rr_RiskHeading Principal Risks
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
The following information provides some indication of the risks of investing in the Fund. Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. You may get updated performance information at www.PrincipalAM.com.
The bar chart shows the investment returns of the Fund’s Institutional Class shares for each full calendar year of operations for 10 years (or, if shorter, the life of the Fund). The table shows for the last one, five, and ten calendar year periods (or, if shorter, the life of the Fund), how the Fund’s average annual total returns compare with those of one or more broad measures of market performance.
Life of Fund returns are measured from the date the Fund’s shares were first sold (September 30, 2014).
For periods prior to the inception date of Class R-6 shares (August 24, 2015) and Class J shares (March 1, 2018), the performance shown in the table for these newer classes is that of the Fund’s Institutional Class shares, adjusted to reflect the respective fees and expenses of each class. These adjustments result in performance for such periods that is no higher than the historical performance of the Institutional Class shares, which were first sold on September 30, 2014.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following information provides some indication of the risks of investing in the Fund.
Performance Additional Market Index [Text] rr_PerformanceAdditionalMarketIndex The S&P Target Date 2040 Index is included as an additional index for the Fund as it shows how the Fund’s performance compares with the returns of an index of funds with similar investment objectives.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.PrincipalAM.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.
Bar Chart [Heading] rr_BarChartHeading Total Returns as of December 31
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
Highest return for a quarter during the period of the bar chart above:Q2 202016.41 %
Lowest return for a quarter during the period of the bar chart above:Q1 2020(17.67)%
Performance Table Heading rr_PerformanceTableHeading Average Annual Total ReturnsFor the periods ended December 31, 2023
Performance Table Market Index Changed rr_PerformanceTableMarketIndexChanged Effective March 1, 2024, the Fund changed its primary broad-based index to the S&P 1500 TR in order to meet the revised definition of “broad-based securities market index.”
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are shown for Institutional Class shares only and would be different for the other share classes.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock
After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. After-tax returns are shown for Institutional Class shares only and would be different for the other share classes.
Effective March 1, 2024, the Fund changed its primary broad-based index to the S&P 1500 TR in order to meet the revised definition of “broad-based securities market index.” The S&P Target Date 2040 Index is included as an additional index for the Fund as it shows how the Fund’s performance compares with the returns of an index of funds with similar investment objectives.
PFI Prospectus | Principal LifeTime Hybrid 2040 Fund | Risk Lose Money [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Many factors affect that value, and it is possible to lose money by investing in the Fund.
PFI Prospectus | Principal LifeTime Hybrid 2040 Fund | Risk Not Insured Depository Institution [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
PFI Prospectus | Principal LifeTime Hybrid 2040 Fund | Counterparty Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Counterparty Risk. Counterparty risk is the risk that the counterparty to a contract or other obligation will be unable or unwilling to honor its obligations.
PFI Prospectus | Principal LifeTime Hybrid 2040 Fund | Derivatives Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Derivatives Risk. Derivatives may not move in the direction anticipated by the portfolio manager. Transactions in derivatives may increase volatility, cause the liquidation of portfolio positions when not advantageous to do so, and result in disproportionate losses that may be substantially greater than a fund’s initial investment.
•Futures. Futures contracts involve specific risks, including: the imperfect correlation between the change in market value of the instruments held by the Fund and the price of the futures contract; possible lack of a liquid secondary market for a futures contract and the resulting inability to close a futures contract when desired; counterparty risk; and if the Fund has insufficient cash, it may have to sell securities from its portfolio to meet daily variation margin requirements.
•Options. Options involve specific risks, including: the imperfect correlation between the change in market value of the instruments held by the Fund and the price of the options; counterparty risk; difference in trading hours for the options markets and the markets for the underlying securities (rate movements can take place in the underlying markets that cannot be reflected in the options markets); and an insufficient liquid secondary market for particular options.
PFI Prospectus | Principal LifeTime Hybrid 2040 Fund | Derivatives Risk, Futures Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Futures. Futures contracts involve specific risks, including: the imperfect correlation between the change in market value of the instruments held by the Fund and the price of the futures contract; possible lack of a liquid secondary market for a futures contract and the resulting inability to close a futures contract when desired; counterparty risk; and if the Fund has insufficient cash, it may have to sell securities from its portfolio to meet daily variation margin requirements.
PFI Prospectus | Principal LifeTime Hybrid 2040 Fund | Derivatives Risk, Options Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Options. Options involve specific risks, including: the imperfect correlation between the change in market value of the instruments held by the Fund and the price of the options; counterparty risk; difference in trading hours for the options markets and the markets for the underlying securities (rate movements can take place in the underlying markets that cannot be reflected in the options markets); and an insufficient liquid secondary market for particular options.
PFI Prospectus | Principal LifeTime Hybrid 2040 Fund | Emerging Markets Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Emerging Markets Risk. Investments in emerging markets may have more risk than those in developed markets because the emerging markets are less developed and more illiquid. Emerging markets can also be subject to increased social, economic, regulatory, and political uncertainties and can be extremely volatile. The U.S. Securities and Exchange Commission, the U.S. Department of Justice, and other U.S. authorities may be limited in their ability to pursue bad actors in emerging markets, including with respect to fraud.
PFI Prospectus | Principal LifeTime Hybrid 2040 Fund | Equity Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Equity Securities Risk. A variety of factors can negatively impact the value of equity securities held by a fund, including a decline in the issuer’s financial condition, unfavorable performance of the issuer’s sector or industry, or changes in response to overall market and economic conditions. A fund’s principal market segment(s) (such as market capitalization or style) may underperform other market segments or the equity markets as a whole.
•Growth Style Risk. Growth investing entails the risk that if growth companies do not increase their earnings at a rate expected by investors, the market price of their stock may decline significantly, even if earnings show an absolute increase. Growth company stocks also typically lack the dividend yield that can lessen price declines in market downturns.
•Smaller Companies Risk. Investments in smaller companies may involve greater risk and price volatility than investments in larger, more mature companies. Smaller companies may have limited product lines, markets, or financial resources; lack the competitive strength of larger companies; have less experienced managers; or depend on a few key employees. Their securities often are less widely held and trade less frequently and in lesser quantities, and their market prices often fluctuate more, than securities of larger companies.
•Value Style Risk. Value investing entails the risk that value stocks may continue to be undervalued by the market for extended periods, including the entire period during which the stock is held by a fund, or the events that would cause the stock price to increase may not occur as anticipated or at all. Moreover, a stock that appears to be undervalued actually may be appropriately priced at a low level and, therefore, would not be profitable for the fund.
PFI Prospectus | Principal LifeTime Hybrid 2040 Fund | Equity Securities Risk, Growth Style Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Growth Style Risk. Growth investing entails the risk that if growth companies do not increase their earnings at a rate expected by investors, the market price of their stock may decline significantly, even if earnings show an absolute increase. Growth company stocks also typically lack the dividend yield that can lessen price declines in market downturns.
PFI Prospectus | Principal LifeTime Hybrid 2040 Fund | Equity Securities Risk, Smaller Companies Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Smaller Companies Risk. Investments in smaller companies may involve greater risk and price volatility than investments in larger, more mature companies. Smaller companies may have limited product lines, markets, or financial resources; lack the competitive strength of larger companies; have less experienced managers; or depend on a few key employees. Their securities often are less widely held and trade less frequently and in lesser quantities, and their market prices often fluctuate more, than securities of larger companies.
PFI Prospectus | Principal LifeTime Hybrid 2040 Fund | Equity Securities Risk, Value Style Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Value Style Risk. Value investing entails the risk that value stocks may continue to be undervalued by the market for extended periods, including the entire period during which the stock is held by a fund, or the events that would cause the stock price to increase may not occur as anticipated or at all. Moreover, a stock that appears to be undervalued actually may be appropriately priced at a low level and, therefore, would not be profitable for the fund.
PFI Prospectus | Principal LifeTime Hybrid 2040 Fund | Fixed-Income Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Fixed-Income Securities Risk. Fixed-income securities are subject to interest rate, credit quality, and liquidity risks. The market value of fixed-income securities generally declines when interest rates rise, and increased interest rates may adversely affect the liquidity of certain fixed-income securities. Moreover, an issuer of fixed-income securities could default on its payment obligations due to increased interest rates or for other reasons.
PFI Prospectus | Principal LifeTime Hybrid 2040 Fund | Foreign Currency Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Foreign Currency Risk. Risks of investing in securities denominated in, or that trade in, foreign (non-U.S.) currencies include changes in foreign exchange rates and foreign exchange restrictions.
PFI Prospectus | Principal LifeTime Hybrid 2040 Fund | Foreign Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Foreign Securities Risk. The risks of foreign securities include loss of value as a result of: political or economic instability; nationalization, expropriation, or confiscatory taxation; settlement delays; and limited government regulation (including less stringent reporting, accounting, and disclosure standards than are required of U.S. companies).
PFI Prospectus | Principal LifeTime Hybrid 2040 Fund | Fund Of Funds Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Fund of Funds Risk. Fund shareholders bear indirectly their proportionate share of the expenses of other investment companies (for example, other mutual funds or exchange-traded funds) in which the Fund invests (“underlying funds”). The Fund’s selection and weighting of asset classes and allocation of investments in underlying funds may cause it to underperform other funds with a similar investment objective. The Fund’s performance and risks correspond directly to the performance and risks of the underlying funds in which it invests, proportionately in accordance with the weightings of such investments, and there is no assurance that the underlying funds will achieve their investment objectives. Management of the Fund entails potential conflicts of interest: the Fund invests in affiliated underlying funds; and PGI and its affiliates may earn different fees from different underlying funds and may have an incentive to allocate more Fund assets to underlying funds from which they receive higher fees.
PFI Prospectus | Principal LifeTime Hybrid 2040 Fund | Index Fund Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Index Fund Risk. Index funds use a passive investment approach and generally do not attempt to manage market volatility, use defensive strategies, or reduce the effect of any long-term periods of poor investment performance. Therefore, the Fund may hold securities that present risks that an investment advisor researching individual securities might seek to avoid. An index fund has operating and other expenses while an index does not. As a result, over time, index funds tend to underperform the index. The correlation between fund performance and index performance may also be affected by the type of passive investment approach used by a fund (sampling or replication), changes in securities markets, changes in the composition of the index, and the timing of purchases and sales of fund shares. Errors or delays in compiling or rebalancing the Index may impact the performance of the Fund and increase transaction costs.
PFI Prospectus | Principal LifeTime Hybrid 2040 Fund | Portfolio Duration Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Portfolio Duration Risk. Portfolio duration is a measure of the expected life of a fixed-income security and its sensitivity to changes in interest rates. The longer a fund’s average portfolio duration, the more sensitive the fund will be to changes in interest rates, which means funds with longer average portfolio durations may be more volatile than those with shorter durations.
PFI Prospectus | Principal LifeTime Hybrid 2040 Fund | Redemption And Large Transaction Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Redemption and Large Transaction Risk. Ownership of the Fund’s shares may be concentrated in one or a few large investors (such as funds of funds, institutional investors, and asset allocation programs) that may redeem or purchase shares in large quantities. These transactions may cause the Fund to sell securities to meet redemptions or to invest additional cash at times it would not otherwise do so, which may result in increased transaction costs, increased expenses, changes to expense ratios, and adverse effects to Fund performance. Such transactions may also accelerate the realization of taxable income if sales of portfolio securities result in gains. Moreover, reallocations by large shareholders among share classes of a fund may result in changes to the expense ratios of affected classes, which may increase the expenses paid by shareholders of the class that experienced the redemption.
PFI Prospectus | Principal LifeTime Hybrid 2040 Fund | Securitized Products Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Securitized Products Risk. Investments in securitized products are subject to risks similar to traditional fixed-income securities, such as credit, interest rate, liquidity, prepayment, extension, and default risk, as well as additional risks associated with the nature of the assets and the servicing of those assets. Unscheduled prepayments on securitized products may have to be reinvested at lower rates. A reduction in prepayments may increase the effective maturities of these securities, exposing them to the risk of decline in market value over time (extension risk).
PFI Prospectus | Principal LifeTime Hybrid 2040 Fund | Target Date Fund Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Target Date Fund Risk. A target date fund should not be selected based solely on age or retirement date because there is no guarantee that this Fund will provide adequate income at or through retirement.
PFI Prospectus | Principal LifeTime Hybrid 2040 Fund | U.S. Government Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
U.S. Government Securities Risk. Yields available from U.S. government securities are generally lower than yields from many other fixed-income securities. The value of U.S. government securities may be adversely impacted by changes in interest rates, changes in the credit rating of the U.S. government, or a default by the U.S. government.
PFI Prospectus | Principal LifeTime Hybrid 2040 Fund | U.S. Government-Sponsored Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
U.S. Government-Sponsored Securities Risk. Securities issued by U.S. government-sponsored enterprises such as the Federal Home Loan Mortgage Corporation, the Federal National Mortgage Association, and the Federal Home Loan Banks are not issued or guaranteed by the U.S. government.
PFI Prospectus | Principal LifeTime Hybrid 2040 Fund | S&P 1500 TR (reflects no deduction for fees, expenses, or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
Label rr_AverageAnnualReturnLabel S&P 1500 TR (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 25.47%
5 Years rr_AverageAnnualReturnYear05 15.39%
Since Inception rr_AverageAnnualReturnSinceInception 11.85%
PFI Prospectus | Principal LifeTime Hybrid 2040 Fund | S&P Target Date 2040 Index (reflects no deduction for fees, expenses, or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
Label rr_AverageAnnualReturnLabel S&P Target Date 2040 Index (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 18.16%
5 Years rr_AverageAnnualReturnYear05 10.22%
Since Inception rr_AverageAnnualReturnSinceInception 7.67%
PFI Prospectus | Principal LifeTime Hybrid 2040 Fund | Class J  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PHJEX
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.15%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.05%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.35%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.55%
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.55%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 156
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 176
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 307
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 689
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 56
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 176
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 307
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 689
Label rr_AverageAnnualReturnLabel Class J Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 17.04%
5 Years rr_AverageAnnualReturnYear05 9.97%
Since Inception rr_AverageAnnualReturnSinceInception 7.46%
PFI Prospectus | Principal LifeTime Hybrid 2040 Fund | Institutional Class  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PLTQX
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.08%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.35%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.43%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.03%) [46]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.40%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 41
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 135
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 238
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 539
Annual Return 2015 rr_AnnualReturn2015 (0.10%)
Annual Return 2016 rr_AnnualReturn2016 8.67%
Annual Return 2017 rr_AnnualReturn2017 19.16%
Annual Return 2018 rr_AnnualReturn2018 (8.59%)
Annual Return 2019 rr_AnnualReturn2019 23.85%
Annual Return 2020 rr_AnnualReturn2020 15.40%
Annual Return 2021 rr_AnnualReturn2021 17.12%
Annual Return 2022 rr_AnnualReturn2022 (17.90%)
Annual Return 2023 rr_AnnualReturn2023 18.18%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Highest return for a quarter during the period of the bar chart above:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 16.41%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Lowest return for a quarter during the period of the bar chart above:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (17.67%)
Label rr_AverageAnnualReturnLabel Institutional Class Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 18.18%
5 Years rr_AverageAnnualReturnYear05 10.19%
Since Inception rr_AverageAnnualReturnSinceInception 7.70%
PFI Prospectus | Principal LifeTime Hybrid 2040 Fund | Institutional Class | After Taxes on Distributions  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Institutional Class Return After Taxes on Distributions
1 Year rr_AverageAnnualReturnYear01 17.13%
5 Years rr_AverageAnnualReturnYear05 8.77%
Since Inception rr_AverageAnnualReturnSinceInception 6.47%
PFI Prospectus | Principal LifeTime Hybrid 2040 Fund | Institutional Class | After Taxes on Distributions and Sales  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Institutional Class Return After Taxes on Distributions and Sale of Fund Shares
1 Year rr_AverageAnnualReturnYear01 11.19%
5 Years rr_AverageAnnualReturnYear05 7.81%
Since Inception rr_AverageAnnualReturnSinceInception 5.88%
PFI Prospectus | Principal LifeTime Hybrid 2040 Fund | Class R-6  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PLMTX
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.02%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.35%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.37%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets none [46]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.37%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 38
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 119
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 208
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 468
Label rr_AverageAnnualReturnLabel Class R-6 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 18.28%
5 Years rr_AverageAnnualReturnYear05 10.22%
Since Inception rr_AverageAnnualReturnSinceInception 7.73%
PFI Prospectus | Principal LifeTime Hybrid 2045 Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading PRINCIPAL LIFETIME HYBRID 2045 FUND
Objective [Heading] rr_ObjectiveHeading Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The Fund seeks a total return consisting of long-term growth of capital and current income.
Expense [Heading] rr_ExpenseHeading Fees and Expenses of the Fund
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock
This table describes the fees and expenses that you may pay if you buy, hold, and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below.
If you purchase Institutional Class or Class R-6 shares through certain programs offered by certain financial intermediaries, you may be required to pay a commission and/or other forms of compensation to the broker, or to your Financial Professional or other financial intermediary.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder Fees (fees paid directly from your investment)
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination February 28, 2025
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock
The Fund and each underlying fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs. These costs, which are not reflected in Annual Fund Operating Expenses or in the Example, affect the Fund’s and the underlying funds' performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 10.8% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 10.80%
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. The calculation of costs takes into account any applicable contractual fee waivers and/or expense reimbursements for the period noted in the table above. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, No Redemption, By Year, Caption [Text] rr_ExpenseExampleNoRedemptionByYearCaption With respect to Class J shares, you would pay the following expenses if you did not redeem your shares (all other classes would be the same as in the above example):
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
The Fund operates as a “target date fund” that invests according to an asset allocation strategy designed for investors having a retirement investment goal close to the year in the Fund’s name. The Fund is a fund of funds that invests in underlying funds of Principal Funds, Inc. (“PFI”), with a majority of the Fund’s assets invested in index funds. Its underlying funds consist of domestic and foreign equity funds, fixed-income funds, real asset funds, and other funds that aim to offer diversification beyond traditional equity and fixed-income securities. The asset class diversification of the Fund is designed to moderate overall price volatility. The Fund may add, remove, or substitute underlying funds at any time.
The Fund is managed with strategic or long-term asset class targets and target ranges. There is a rebalancing strategy that aligns with the target weights to identify asset classes that are either overweight or underweight. The Fund may shift asset class targets in response to normal evaluative processes, the shortening time horizon of the Fund, or changes in market forces or Fund circumstances.
In selecting underlying funds and target weights, the Fund considers both quantitative measures (e.g., past performance, expected levels of risk and returns, expense levels, diversification, and style consistency) and qualitative factors (e.g., organizational stability, investment experience, investment and risk management processes, and information, trading, and compliance systems). There are no minimum or maximum percentages of assets that the Fund must invest in a specific asset class or underlying fund.
The underlying funds invest in growth and value stocks of small, medium, and large market capitalization companies, fixed-income securities, domestic and foreign (including those in emerging markets) securities, securities denominated in foreign currencies, investment companies (including index funds), and derivatives. A derivative is a financial arrangement, the value of which is derived from, or based on, a traditional security, asset, or market index. The underlying funds principally use equity index futures and options in order to gain exposure to a variety of securities or asset classes or attempt to reduce risk.
The Fund’s asset allocation will become more conservative over time as investment goals near (for example, retirement, which is assumed to begin at age 65) and investors become more risk-averse. Approximately 10 years after its target year, the Fund’s underlying fund allocation is expected to match that of the Principal LifeTime Hybrid Income Fund. At that time, the Fund may be combined with the Principal LifeTime Hybrid Income Fund if the Board of Directors determines that the combination is in the best interests of Fund shareholders. It is expected that at the target date in the Fund’s name, the shareholder will begin gradually withdrawing the account’s value.
LT Hybrid Glidepath.jpg
Risk [Heading] rr_RiskHeading Principal Risks
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
The following information provides some indication of the risks of investing in the Fund. Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. You may get updated performance information at www.PrincipalAM.com.
The bar chart shows the investment returns of the Fund’s Institutional Class shares for each full calendar year of operations for 10 years (or, if shorter, the life of the Fund). The table shows for the last one, five, and ten calendar year periods (or, if shorter, the life of the Fund), how the Fund’s average annual total returns compare with those of one or more broad measures of market performance.
Life of Fund returns are measured from the date the Fund’s shares were first sold (September 30, 2014).
For periods prior to the inception date of Class R-6 shares (August 24, 2015) and Class J shares (March 1, 2018), the performance shown in the table for these newer classes is that of the Fund’s Institutional Class shares, adjusted to reflect the respective fees and expenses of each class. These adjustments result in performance for such periods that is no higher than the historical performance of the Institutional Class shares, which were first sold on September 30, 2014.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following information provides some indication of the risks of investing in the Fund.
Performance Additional Market Index [Text] rr_PerformanceAdditionalMarketIndex The S&P Target Date 2045 Index is included as an additional index for the Fund as it shows how the Fund’s performance compares with the returns of an index of funds with similar investment objectives.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.PrincipalAM.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.
Bar Chart [Heading] rr_BarChartHeading Total Returns as of December 31
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
Highest return for a quarter during the period of the bar chart above:Q2 202017.28 %
Lowest return for a quarter during the period of the bar chart above:Q1 2020(18.83)%
Performance Table Heading rr_PerformanceTableHeading Average Annual Total ReturnsFor the periods ended December 31, 2023
Performance Table Market Index Changed rr_PerformanceTableMarketIndexChanged Effective March 1, 2024, the Fund changed its primary broad-based index to the S&P 1500 TR in order to meet the revised definition of “broad-based securities market index.”
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are shown for Institutional Class shares only and would be different for the other share classes.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock
After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. After-tax returns are shown for Institutional Class shares only and would be different for the other share classes.
Effective March 1, 2024, the Fund changed its primary broad-based index to the S&P 1500 TR in order to meet the revised definition of “broad-based securities market index.” The S&P Target Date 2045 Index is included as an additional index for the Fund as it shows how the Fund’s performance compares with the returns of an index of funds with similar investment objectives.
PFI Prospectus | Principal LifeTime Hybrid 2045 Fund | Risk Lose Money [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Many factors affect that value, and it is possible to lose money by investing in the Fund.
PFI Prospectus | Principal LifeTime Hybrid 2045 Fund | Risk Not Insured Depository Institution [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
PFI Prospectus | Principal LifeTime Hybrid 2045 Fund | Counterparty Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Counterparty Risk. Counterparty risk is the risk that the counterparty to a contract or other obligation will be unable or unwilling to honor its obligations.
PFI Prospectus | Principal LifeTime Hybrid 2045 Fund | Derivatives Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Derivatives Risk. Derivatives may not move in the direction anticipated by the portfolio manager. Transactions in derivatives may increase volatility, cause the liquidation of portfolio positions when not advantageous to do so, and result in disproportionate losses that may be substantially greater than a fund’s initial investment.
•Futures. Futures contracts involve specific risks, including: the imperfect correlation between the change in market value of the instruments held by the Fund and the price of the futures contract; possible lack of a liquid secondary market for a futures contract and the resulting inability to close a futures contract when desired; counterparty risk; and if the Fund has insufficient cash, it may have to sell securities from its portfolio to meet daily variation margin requirements.
•Options. Options involve specific risks, including: the imperfect correlation between the change in market value of the instruments held by the Fund and the price of the options; counterparty risk; difference in trading hours for the options markets and the markets for the underlying securities (rate movements can take place in the underlying markets that cannot be reflected in the options markets); and an insufficient liquid secondary market for particular options.
PFI Prospectus | Principal LifeTime Hybrid 2045 Fund | Derivatives Risk, Futures Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Futures. Futures contracts involve specific risks, including: the imperfect correlation between the change in market value of the instruments held by the Fund and the price of the futures contract; possible lack of a liquid secondary market for a futures contract and the resulting inability to close a futures contract when desired; counterparty risk; and if the Fund has insufficient cash, it may have to sell securities from its portfolio to meet daily variation margin requirements.
PFI Prospectus | Principal LifeTime Hybrid 2045 Fund | Derivatives Risk, Options Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Options. Options involve specific risks, including: the imperfect correlation between the change in market value of the instruments held by the Fund and the price of the options; counterparty risk; difference in trading hours for the options markets and the markets for the underlying securities (rate movements can take place in the underlying markets that cannot be reflected in the options markets); and an insufficient liquid secondary market for particular options.
PFI Prospectus | Principal LifeTime Hybrid 2045 Fund | Emerging Markets Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Emerging Markets Risk. Investments in emerging markets may have more risk than those in developed markets because the emerging markets are less developed and more illiquid. Emerging markets can also be subject to increased social, economic, regulatory, and political uncertainties and can be extremely volatile. The U.S. Securities and Exchange Commission, the U.S. Department of Justice, and other U.S. authorities may be limited in their ability to pursue bad actors in emerging markets, including with respect to fraud.
PFI Prospectus | Principal LifeTime Hybrid 2045 Fund | Equity Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Equity Securities Risk. A variety of factors can negatively impact the value of equity securities held by a fund, including a decline in the issuer’s financial condition, unfavorable performance of the issuer’s sector or industry, or changes in response to overall market and economic conditions. A fund’s principal market segment(s) (such as market capitalization or style) may underperform other market segments or the equity markets as a whole.
•Growth Style Risk. Growth investing entails the risk that if growth companies do not increase their earnings at a rate expected by investors, the market price of their stock may decline significantly, even if earnings show an absolute increase. Growth company stocks also typically lack the dividend yield that can lessen price declines in market downturns.
•Smaller Companies Risk. Investments in smaller companies may involve greater risk and price volatility than investments in larger, more mature companies. Smaller companies may have limited product lines, markets, or financial resources; lack the competitive strength of larger companies; have less experienced managers; or depend on a few key employees. Their securities often are less widely held and trade less frequently and in lesser quantities, and their market prices often fluctuate more, than securities of larger companies.
•Value Style Risk. Value investing entails the risk that value stocks may continue to be undervalued by the market for extended periods, including the entire period during which the stock is held by a fund, or the events that would cause the stock price to increase may not occur as anticipated or at all. Moreover, a stock that appears to be undervalued actually may be appropriately priced at a low level and, therefore, would not be profitable for the fund.
PFI Prospectus | Principal LifeTime Hybrid 2045 Fund | Equity Securities Risk, Growth Style Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Growth Style Risk. Growth investing entails the risk that if growth companies do not increase their earnings at a rate expected by investors, the market price of their stock may decline significantly, even if earnings show an absolute increase. Growth company stocks also typically lack the dividend yield that can lessen price declines in market downturns.
PFI Prospectus | Principal LifeTime Hybrid 2045 Fund | Equity Securities Risk, Smaller Companies Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Smaller Companies Risk. Investments in smaller companies may involve greater risk and price volatility than investments in larger, more mature companies. Smaller companies may have limited product lines, markets, or financial resources; lack the competitive strength of larger companies; have less experienced managers; or depend on a few key employees. Their securities often are less widely held and trade less frequently and in lesser quantities, and their market prices often fluctuate more, than securities of larger companies.
PFI Prospectus | Principal LifeTime Hybrid 2045 Fund | Equity Securities Risk, Value Style Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Value Style Risk. Value investing entails the risk that value stocks may continue to be undervalued by the market for extended periods, including the entire period during which the stock is held by a fund, or the events that would cause the stock price to increase may not occur as anticipated or at all. Moreover, a stock that appears to be undervalued actually may be appropriately priced at a low level and, therefore, would not be profitable for the fund.
PFI Prospectus | Principal LifeTime Hybrid 2045 Fund | Fixed-Income Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Fixed-Income Securities Risk. Fixed-income securities are subject to interest rate, credit quality, and liquidity risks. The market value of fixed-income securities generally declines when interest rates rise, and increased interest rates may adversely affect the liquidity of certain fixed-income securities. Moreover, an issuer of fixed-income securities could default on its payment obligations due to increased interest rates or for other reasons.
PFI Prospectus | Principal LifeTime Hybrid 2045 Fund | Foreign Currency Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Foreign Currency Risk. Risks of investing in securities denominated in, or that trade in, foreign (non-U.S.) currencies include changes in foreign exchange rates and foreign exchange restrictions.
PFI Prospectus | Principal LifeTime Hybrid 2045 Fund | Foreign Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Foreign Securities Risk. The risks of foreign securities include loss of value as a result of: political or economic instability; nationalization, expropriation, or confiscatory taxation; settlement delays; and limited government regulation (including less stringent reporting, accounting, and disclosure standards than are required of U.S. companies).
PFI Prospectus | Principal LifeTime Hybrid 2045 Fund | Fund Of Funds Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Fund of Funds Risk. Fund shareholders bear indirectly their proportionate share of the expenses of other investment companies (for example, other mutual funds or exchange-traded funds) in which the Fund invests (“underlying funds”). The Fund’s selection and weighting of asset classes and allocation of investments in underlying funds may cause it to underperform other funds with a similar investment objective. The Fund’s performance and risks correspond directly to the performance and risks of the underlying funds in which it invests, proportionately in accordance with the weightings of such investments, and there is no assurance that the underlying funds will achieve their investment objectives. Management of the Fund entails potential conflicts of interest: the Fund invests in affiliated underlying funds; and PGI and its affiliates may earn different fees from different underlying funds and may have an incentive to allocate more Fund assets to underlying funds from which they receive higher fees.
PFI Prospectus | Principal LifeTime Hybrid 2045 Fund | Index Fund Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Index Fund Risk. Index funds use a passive investment approach and generally do not attempt to manage market volatility, use defensive strategies, or reduce the effect of any long-term periods of poor investment performance. Therefore, the Fund may hold securities that present risks that an investment advisor researching individual securities might seek to avoid. An index fund has operating and other expenses while an index does not. As a result, over time, index funds tend to underperform the index. The correlation between fund performance and index performance may also be affected by the type of passive investment approach used by a fund (sampling or replication), changes in securities markets, changes in the composition of the index, and the timing of purchases and sales of fund shares. Errors or delays in compiling or rebalancing the Index may impact the performance of the Fund and increase transaction costs.
PFI Prospectus | Principal LifeTime Hybrid 2045 Fund | Portfolio Duration Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Portfolio Duration Risk. Portfolio duration is a measure of the expected life of a fixed-income security and its sensitivity to changes in interest rates. The longer a fund’s average portfolio duration, the more sensitive the fund will be to changes in interest rates, which means funds with longer average portfolio durations may be more volatile than those with shorter durations.
PFI Prospectus | Principal LifeTime Hybrid 2045 Fund | Redemption And Large Transaction Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Redemption and Large Transaction Risk. Ownership of the Fund’s shares may be concentrated in one or a few large investors (such as funds of funds, institutional investors, and asset allocation programs) that may redeem or purchase shares in large quantities. These transactions may cause the Fund to sell securities to meet redemptions or to invest additional cash at times it would not otherwise do so, which may result in increased transaction costs, increased expenses, changes to expense ratios, and adverse effects to Fund performance. Such transactions may also accelerate the realization of taxable income if sales of portfolio securities result in gains. Moreover, reallocations by large shareholders among share classes of a fund may result in changes to the expense ratios of affected classes, which may increase the expenses paid by shareholders of the class that experienced the redemption.
PFI Prospectus | Principal LifeTime Hybrid 2045 Fund | Target Date Fund Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Target Date Fund Risk. A target date fund should not be selected based solely on age or retirement date because there is no guarantee that this Fund will provide adequate income at or through retirement.
PFI Prospectus | Principal LifeTime Hybrid 2045 Fund | S&P 1500 TR (reflects no deduction for fees, expenses, or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
Label rr_AverageAnnualReturnLabel S&P 1500 TR (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 25.47%
5 Years rr_AverageAnnualReturnYear05 15.39%
Since Inception rr_AverageAnnualReturnSinceInception 11.85%
PFI Prospectus | Principal LifeTime Hybrid 2045 Fund | S&P Target Date 2045 Index (reflects no deduction for fees, expenses, or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
Label rr_AverageAnnualReturnLabel S&P Target Date 2045 Index (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 19.14%
5 Years rr_AverageAnnualReturnYear05 10.68%
Since Inception rr_AverageAnnualReturnSinceInception 7.96%
PFI Prospectus | Principal LifeTime Hybrid 2045 Fund | Class J  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PHJYX
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.15%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.08%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.36%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.59%
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.59%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 160
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 189
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 329
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 738
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 60
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 189
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 329
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 738
Label rr_AverageAnnualReturnLabel Class J Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 18.28%
5 Years rr_AverageAnnualReturnYear05 10.58%
Since Inception rr_AverageAnnualReturnSinceInception 7.80%
PFI Prospectus | Principal LifeTime Hybrid 2045 Fund | Institutional Class  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PHTYX
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.09%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.36%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.45%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.04%) [47]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.41%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 42
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 140
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 248
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 563
Annual Return 2015 rr_AnnualReturn2015 (0.40%)
Annual Return 2016 rr_AnnualReturn2016 9.06%
Annual Return 2017 rr_AnnualReturn2017 19.82%
Annual Return 2018 rr_AnnualReturn2018 (9.06%)
Annual Return 2019 rr_AnnualReturn2019 24.78%
Annual Return 2020 rr_AnnualReturn2020 15.77%
Annual Return 2021 rr_AnnualReturn2021 18.40%
Annual Return 2022 rr_AnnualReturn2022 (18.27%)
Annual Return 2023 rr_AnnualReturn2023 19.38%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Highest return for a quarter during the period of the bar chart above:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 17.28%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Lowest return for a quarter during the period of the bar chart above:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (18.83%)
Label rr_AverageAnnualReturnLabel Institutional Class Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 19.38%
5 Years rr_AverageAnnualReturnYear05 10.79%
Since Inception rr_AverageAnnualReturnSinceInception 8.04%
PFI Prospectus | Principal LifeTime Hybrid 2045 Fund | Institutional Class | After Taxes on Distributions  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Institutional Class Return After Taxes on Distributions
1 Year rr_AverageAnnualReturnYear01 18.40%
5 Years rr_AverageAnnualReturnYear05 9.43%
Since Inception rr_AverageAnnualReturnSinceInception 6.86%
PFI Prospectus | Principal LifeTime Hybrid 2045 Fund | Institutional Class | After Taxes on Distributions and Sales  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Institutional Class Return After Taxes on Distributions and Sale of Fund Shares
1 Year rr_AverageAnnualReturnYear01 11.94%
5 Years rr_AverageAnnualReturnYear05 8.35%
Since Inception rr_AverageAnnualReturnSinceInception 6.20%
PFI Prospectus | Principal LifeTime Hybrid 2045 Fund | Class R-6  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PLNTX
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.03%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.36%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.39%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.01%) [47]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.38%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 39
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 124
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 218
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 492
Label rr_AverageAnnualReturnLabel Class R-6 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 19.48%
5 Years rr_AverageAnnualReturnYear05 10.82%
Since Inception rr_AverageAnnualReturnSinceInception 8.07%
PFI Prospectus | Principal LifeTime Hybrid 2050 Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading PRINCIPAL LIFETIME HYBRID 2050 FUND
Objective [Heading] rr_ObjectiveHeading Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The Fund seeks a total return consisting of long-term growth of capital and current income.
Expense [Heading] rr_ExpenseHeading Fees and Expenses of the Fund
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock
This table describes the fees and expenses that you may pay if you buy, hold, and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below.
If you purchase Institutional Class or Class R-6 shares through certain programs offered by certain financial intermediaries, you may be required to pay a commission and/or other forms of compensation to the broker, or to your Financial Professional or other financial intermediary.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder Fees (fees paid directly from your investment)
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination February 28, 2025
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock
The Fund and each underlying fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs. These costs, which are not reflected in Annual Fund Operating Expenses or in the Example, affect the Fund’s and the underlying funds' performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 8.5% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 8.50%
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. The calculation of costs takes into account any applicable contractual fee waivers and/or expense reimbursements for the period noted in the table above. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, No Redemption, By Year, Caption [Text] rr_ExpenseExampleNoRedemptionByYearCaption With respect to Class J shares, you would pay the following expenses if you did not redeem your shares (all other classes would be the same as in the above example):
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
The Fund operates as a “target date fund” that invests according to an asset allocation strategy designed for investors having a retirement investment goal close to the year in the Fund’s name. The Fund is a fund of funds that invests in underlying funds of Principal Funds, Inc. (“PFI”), with a majority of the Fund’s assets invested in index funds. Its underlying funds consist of domestic and foreign equity funds, fixed-income funds, real asset funds, and other funds that aim to offer diversification beyond traditional equity and fixed-income securities. The asset class diversification of the Fund is designed to moderate overall price volatility. The Fund may add, remove, or substitute underlying funds at any time.
The Fund is managed with strategic or long-term asset class targets and target ranges. There is a rebalancing strategy that aligns with the target weights to identify asset classes that are either overweight or underweight. The Fund may shift asset class targets in response to normal evaluative processes, the shortening time horizon of the Fund, or changes in market forces or Fund circumstances.
In selecting underlying funds and target weights, the Fund considers both quantitative measures (e.g., past performance, expected levels of risk and returns, expense levels, diversification, and style consistency) and qualitative factors (e.g., organizational stability, investment experience, investment and risk management processes, and information, trading, and compliance systems). There are no minimum or maximum percentages of assets that the Fund must invest in a specific asset class or underlying fund.
The underlying funds invest in growth and value stocks of small, medium, and large market capitalization companies, fixed-income securities, domestic and foreign (including those in emerging markets) securities, securities denominated in foreign currencies, investment companies (including index funds), and derivatives. A derivative is a financial arrangement, the value of which is derived from, or based on, a traditional security, asset, or market index. The underlying funds principally use equity index futures and options in order to gain exposure to a variety of securities or asset classes or attempt to reduce risk.
The Fund’s asset allocation will become more conservative over time as investment goals near (for example, retirement, which is assumed to begin at age 65) and investors become more risk-averse. Approximately 10 years after its target year, the Fund’s underlying fund allocation is expected to match that of the Principal LifeTime Hybrid Income Fund. At that time, the Fund may be combined with the Principal LifeTime Hybrid Income Fund if the Board of Directors determines that the combination is in the best interests of Fund shareholders. It is expected that at the target date in the Fund’s name, the shareholder will begin gradually withdrawing the account’s value.
LT Hybrid Glidepath.jpg
Risk [Heading] rr_RiskHeading Principal Risks
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
The following information provides some indication of the risks of investing in the Fund. Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. You may get updated performance information at www.PrincipalAM.com.
The bar chart shows the investment returns of the Fund’s Institutional Class shares for each full calendar year of operations for 10 years (or, if shorter, the life of the Fund). The table shows for the last one, five, and ten calendar year periods (or, if shorter, the life of the Fund), how the Fund’s average annual total returns compare with those of one or more broad measures of market performance.
Life of Fund returns are measured from the date the Fund’s shares were first sold (September 30, 2014).
For periods prior to the inception date of Class R-6 shares (August 24, 2015) and Class J shares (March 1, 2018), the performance shown in the table for these newer classes is that of the Fund’s Institutional Class shares, adjusted to reflect the respective fees and expenses of each class. These adjustments result in performance for such periods that is no higher than the historical performance of the Institutional Class shares, which were first sold on September 30, 2014.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following information provides some indication of the risks of investing in the Fund.
Performance Additional Market Index [Text] rr_PerformanceAdditionalMarketIndex The S&P Target Date 2050 Index is included as an additional index for the Fund as it shows how the Fund’s performance compares with the returns of an index of funds with similar investment objectives.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.PrincipalAM.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.
Bar Chart [Heading] rr_BarChartHeading Total Returns as of December 31
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
Highest return for a quarter during the period of the bar chart above:Q2 202018.00 %
Lowest return for a quarter during the period of the bar chart above:Q1 2020(19.78)%
Performance Table Heading rr_PerformanceTableHeading Average Annual Total ReturnsFor the periods ended December 31, 2023
Performance Table Market Index Changed rr_PerformanceTableMarketIndexChanged Effective March 1, 2024, the Fund changed its primary broad-based index to the S&P 1500 TR in order to meet the revised definition of “broad-based securities market index.”
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are shown for Institutional Class shares only and would be different for the other share classes.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock
After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. After-tax returns are shown for Institutional Class shares only and would be different for the other share classes.
Effective March 1, 2024, the Fund changed its primary broad-based index to the S&P 1500 TR in order to meet the revised definition of “broad-based securities market index.” The S&P Target Date 2050 Index is included as an additional index for the Fund as it shows how the Fund’s performance compares with the returns of an index of funds with similar investment objectives.
PFI Prospectus | Principal LifeTime Hybrid 2050 Fund | Risk Lose Money [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Many factors affect that value, and it is possible to lose money by investing in the Fund.
PFI Prospectus | Principal LifeTime Hybrid 2050 Fund | Risk Not Insured Depository Institution [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
PFI Prospectus | Principal LifeTime Hybrid 2050 Fund | Counterparty Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Counterparty Risk. Counterparty risk is the risk that the counterparty to a contract or other obligation will be unable or unwilling to honor its obligations.
PFI Prospectus | Principal LifeTime Hybrid 2050 Fund | Derivatives Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Derivatives Risk. Derivatives may not move in the direction anticipated by the portfolio manager. Transactions in derivatives may increase volatility, cause the liquidation of portfolio positions when not advantageous to do so, and result in disproportionate losses that may be substantially greater than a fund’s initial investment.
•Futures. Futures contracts involve specific risks, including: the imperfect correlation between the change in market value of the instruments held by the Fund and the price of the futures contract; possible lack of a liquid secondary market for a futures contract and the resulting inability to close a futures contract when desired; counterparty risk; and if the Fund has insufficient cash, it may have to sell securities from its portfolio to meet daily variation margin requirements.
•Options. Options involve specific risks, including: the imperfect correlation between the change in market value of the instruments held by the Fund and the price of the options; counterparty risk; difference in trading hours for the options markets and the markets for the underlying securities (rate movements can take place in the underlying markets that cannot be reflected in the options markets); and an insufficient liquid secondary market for particular options.
PFI Prospectus | Principal LifeTime Hybrid 2050 Fund | Derivatives Risk, Futures Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Futures. Futures contracts involve specific risks, including: the imperfect correlation between the change in market value of the instruments held by the Fund and the price of the futures contract; possible lack of a liquid secondary market for a futures contract and the resulting inability to close a futures contract when desired; counterparty risk; and if the Fund has insufficient cash, it may have to sell securities from its portfolio to meet daily variation margin requirements.
PFI Prospectus | Principal LifeTime Hybrid 2050 Fund | Derivatives Risk, Options Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Options. Options involve specific risks, including: the imperfect correlation between the change in market value of the instruments held by the Fund and the price of the options; counterparty risk; difference in trading hours for the options markets and the markets for the underlying securities (rate movements can take place in the underlying markets that cannot be reflected in the options markets); and an insufficient liquid secondary market for particular options.
PFI Prospectus | Principal LifeTime Hybrid 2050 Fund | Emerging Markets Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Emerging Markets Risk. Investments in emerging markets may have more risk than those in developed markets because the emerging markets are less developed and more illiquid. Emerging markets can also be subject to increased social, economic, regulatory, and political uncertainties and can be extremely volatile. The U.S. Securities and Exchange Commission, the U.S. Department of Justice, and other U.S. authorities may be limited in their ability to pursue bad actors in emerging markets, including with respect to fraud.
PFI Prospectus | Principal LifeTime Hybrid 2050 Fund | Equity Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Equity Securities Risk. A variety of factors can negatively impact the value of equity securities held by a fund, including a decline in the issuer’s financial condition, unfavorable performance of the issuer’s sector or industry, or changes in response to overall market and economic conditions. A fund’s principal market segment(s) (such as market capitalization or style) may underperform other market segments or the equity markets as a whole.
•Growth Style Risk. Growth investing entails the risk that if growth companies do not increase their earnings at a rate expected by investors, the market price of their stock may decline significantly, even if earnings show an absolute increase. Growth company stocks also typically lack the dividend yield that can lessen price declines in market downturns.
•Smaller Companies Risk. Investments in smaller companies may involve greater risk and price volatility than investments in larger, more mature companies. Smaller companies may have limited product lines, markets, or financial resources; lack the competitive strength of larger companies; have less experienced managers; or depend on a few key employees. Their securities often are less widely held and trade less frequently and in lesser quantities, and their market prices often fluctuate more, than securities of larger companies.
•Value Style Risk. Value investing entails the risk that value stocks may continue to be undervalued by the market for extended periods, including the entire period during which the stock is held by a fund, or the events that would cause the stock price to increase may not occur as anticipated or at all. Moreover, a stock that appears to be undervalued actually may be appropriately priced at a low level and, therefore, would not be profitable for the fund.
PFI Prospectus | Principal LifeTime Hybrid 2050 Fund | Equity Securities Risk, Growth Style Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Growth Style Risk. Growth investing entails the risk that if growth companies do not increase their earnings at a rate expected by investors, the market price of their stock may decline significantly, even if earnings show an absolute increase. Growth company stocks also typically lack the dividend yield that can lessen price declines in market downturns.
PFI Prospectus | Principal LifeTime Hybrid 2050 Fund | Equity Securities Risk, Smaller Companies Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Smaller Companies Risk. Investments in smaller companies may involve greater risk and price volatility than investments in larger, more mature companies. Smaller companies may have limited product lines, markets, or financial resources; lack the competitive strength of larger companies; have less experienced managers; or depend on a few key employees. Their securities often are less widely held and trade less frequently and in lesser quantities, and their market prices often fluctuate more, than securities of larger companies.
PFI Prospectus | Principal LifeTime Hybrid 2050 Fund | Equity Securities Risk, Value Style Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Value Style Risk. Value investing entails the risk that value stocks may continue to be undervalued by the market for extended periods, including the entire period during which the stock is held by a fund, or the events that would cause the stock price to increase may not occur as anticipated or at all. Moreover, a stock that appears to be undervalued actually may be appropriately priced at a low level and, therefore, would not be profitable for the fund.
PFI Prospectus | Principal LifeTime Hybrid 2050 Fund | Fixed-Income Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Fixed-Income Securities Risk. Fixed-income securities are subject to interest rate, credit quality, and liquidity risks. The market value of fixed-income securities generally declines when interest rates rise, and increased interest rates may adversely affect the liquidity of certain fixed-income securities. Moreover, an issuer of fixed-income securities could default on its payment obligations due to increased interest rates or for other reasons.
PFI Prospectus | Principal LifeTime Hybrid 2050 Fund | Foreign Currency Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Foreign Currency Risk. Risks of investing in securities denominated in, or that trade in, foreign (non-U.S.) currencies include changes in foreign exchange rates and foreign exchange restrictions.
PFI Prospectus | Principal LifeTime Hybrid 2050 Fund | Foreign Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Foreign Securities Risk. The risks of foreign securities include loss of value as a result of: political or economic instability; nationalization, expropriation, or confiscatory taxation; settlement delays; and limited government regulation (including less stringent reporting, accounting, and disclosure standards than are required of U.S. companies).
PFI Prospectus | Principal LifeTime Hybrid 2050 Fund | Fund Of Funds Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Fund of Funds Risk. Fund shareholders bear indirectly their proportionate share of the expenses of other investment companies (for example, other mutual funds or exchange-traded funds) in which the Fund invests (“underlying funds”). The Fund’s selection and weighting of asset classes and allocation of investments in underlying funds may cause it to underperform other funds with a similar investment objective. The Fund’s performance and risks correspond directly to the performance and risks of the underlying funds in which it invests, proportionately in accordance with the weightings of such investments, and there is no assurance that the underlying funds will achieve their investment objectives. Management of the Fund entails potential conflicts of interest: the Fund invests in affiliated underlying funds; and PGI and its affiliates may earn different fees from different underlying funds and may have an incentive to allocate more Fund assets to underlying funds from which they receive higher fees.
PFI Prospectus | Principal LifeTime Hybrid 2050 Fund | Index Fund Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Index Fund Risk. Index funds use a passive investment approach and generally do not attempt to manage market volatility, use defensive strategies, or reduce the effect of any long-term periods of poor investment performance. Therefore, the Fund may hold securities that present risks that an investment advisor researching individual securities might seek to avoid. An index fund has operating and other expenses while an index does not. As a result, over time, index funds tend to underperform the index. The correlation between fund performance and index performance may also be affected by the type of passive investment approach used by a fund (sampling or replication), changes in securities markets, changes in the composition of the index, and the timing of purchases and sales of fund shares. Errors or delays in compiling or rebalancing the Index may impact the performance of the Fund and increase transaction costs.
PFI Prospectus | Principal LifeTime Hybrid 2050 Fund | Portfolio Duration Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Portfolio Duration Risk. Portfolio duration is a measure of the expected life of a fixed-income security and its sensitivity to changes in interest rates. The longer a fund’s average portfolio duration, the more sensitive the fund will be to changes in interest rates, which means funds with longer average portfolio durations may be more volatile than those with shorter durations.
PFI Prospectus | Principal LifeTime Hybrid 2050 Fund | Redemption And Large Transaction Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Redemption and Large Transaction Risk. Ownership of the Fund’s shares may be concentrated in one or a few large investors (such as funds of funds, institutional investors, and asset allocation programs) that may redeem or purchase shares in large quantities. These transactions may cause the Fund to sell securities to meet redemptions or to invest additional cash at times it would not otherwise do so, which may result in increased transaction costs, increased expenses, changes to expense ratios, and adverse effects to Fund performance. Such transactions may also accelerate the realization of taxable income if sales of portfolio securities result in gains. Moreover, reallocations by large shareholders among share classes of a fund may result in changes to the expense ratios of affected classes, which may increase the expenses paid by shareholders of the class that experienced the redemption.
PFI Prospectus | Principal LifeTime Hybrid 2050 Fund | Target Date Fund Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Target Date Fund Risk. A target date fund should not be selected based solely on age or retirement date because there is no guarantee that this Fund will provide adequate income at or through retirement.
PFI Prospectus | Principal LifeTime Hybrid 2050 Fund | S&P 1500 TR (reflects no deduction for fees, expenses, or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
Label rr_AverageAnnualReturnLabel S&P 1500 TR (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 25.47%
5 Years rr_AverageAnnualReturnYear05 15.39%
Since Inception rr_AverageAnnualReturnSinceInception 11.85%
PFI Prospectus | Principal LifeTime Hybrid 2050 Fund | S&P Target Date 2050 Index (reflects no deduction for fees, expenses, or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
Label rr_AverageAnnualReturnLabel S&P Target Date 2050 Index (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 19.58%
5 Years rr_AverageAnnualReturnYear05 10.92%
Since Inception rr_AverageAnnualReturnSinceInception 8.15%
PFI Prospectus | Principal LifeTime Hybrid 2050 Fund | Class J  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PHJUX
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.15%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.10%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.37%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.62%
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.62%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 163
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 199
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 346
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 774
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 63
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 199
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 346
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 774
Label rr_AverageAnnualReturnLabel Class J Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 19.09%
5 Years rr_AverageAnnualReturnYear05 10.95%
Since Inception rr_AverageAnnualReturnSinceInception 8.09%
PFI Prospectus | Principal LifeTime Hybrid 2050 Fund | Institutional Class  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PHTUX
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.10%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.37%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.47%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.05%) [48]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.42%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 43
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 146
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 258
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 587
Annual Return 2015 rr_AnnualReturn2015 (0.11%)
Annual Return 2016 rr_AnnualReturn2016 9.29%
Annual Return 2017 rr_AnnualReturn2017 20.49%
Annual Return 2018 rr_AnnualReturn2018 (9.46%)
Annual Return 2019 rr_AnnualReturn2019 25.58%
Annual Return 2020 rr_AnnualReturn2020 15.93%
Annual Return 2021 rr_AnnualReturn2021 19.11%
Annual Return 2022 rr_AnnualReturn2022 (18.49%)
Annual Return 2023 rr_AnnualReturn2023 20.32%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Highest return for a quarter during the period of the bar chart above:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 18.00%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Lowest return for a quarter during the period of the bar chart above:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (19.78%)
Label rr_AverageAnnualReturnLabel Institutional Class Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 20.32%
5 Years rr_AverageAnnualReturnYear05 11.21%
Since Inception rr_AverageAnnualReturnSinceInception 8.33%
PFI Prospectus | Principal LifeTime Hybrid 2050 Fund | Institutional Class | After Taxes on Distributions  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Institutional Class Return After Taxes on Distributions
1 Year rr_AverageAnnualReturnYear01 19.42%
5 Years rr_AverageAnnualReturnYear05 9.88%
Since Inception rr_AverageAnnualReturnSinceInception 7.16%
PFI Prospectus | Principal LifeTime Hybrid 2050 Fund | Institutional Class | After Taxes on Distributions and Sales  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Institutional Class Return After Taxes on Distributions and Sale of Fund Shares
1 Year rr_AverageAnnualReturnYear01 12.54%
5 Years rr_AverageAnnualReturnYear05 8.71%
Since Inception rr_AverageAnnualReturnSinceInception 6.46%
PFI Prospectus | Principal LifeTime Hybrid 2050 Fund | Class R-6  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PLJTX
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.03%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.37%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.40%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.01%) [48]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.39%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 40
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 127
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 223
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 504
Label rr_AverageAnnualReturnLabel Class R-6 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 20.35%
5 Years rr_AverageAnnualReturnYear05 11.24%
Since Inception rr_AverageAnnualReturnSinceInception 8.34%
PFI Prospectus | Principal LifeTime Hybrid 2055 Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading PRINCIPAL LIFETIME HYBRID 2055 FUND
Objective [Heading] rr_ObjectiveHeading Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The Fund seeks a total return consisting of long-term growth of capital and current income.
Expense [Heading] rr_ExpenseHeading Fees and Expenses of the Fund
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock
This table describes the fees and expenses that you may pay if you buy, hold, and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below.
If you purchase Institutional Class or Class R-6 shares through certain programs offered by certain financial intermediaries, you may be required to pay a commission and/or other forms of compensation to the broker, or to your Financial Professional or other financial intermediary.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder Fees (fees paid directly from your investment)
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination February 28, 2025
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock
The Fund and each underlying fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs. These costs, which are not reflected in Annual Fund Operating Expenses or in the Example, affect the Fund’s and the underlying funds' performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 7.3% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 7.30%
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. The calculation of costs takes into account any applicable contractual fee waivers and/or expense reimbursements for the period noted in the table above. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, No Redemption, By Year, Caption [Text] rr_ExpenseExampleNoRedemptionByYearCaption With respect to Class J shares, you would pay the following expenses if you did not redeem your shares (all other classes would be the same as in the above example):
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
The Fund operates as a “target date fund” that invests according to an asset allocation strategy designed for investors having a retirement investment goal close to the year in the Fund’s name. The Fund is a fund of funds that invests in underlying funds of Principal Funds, Inc. (“PFI”), with a majority of the Fund’s assets invested in index funds. Its underlying funds consist of domestic and foreign equity funds, fixed-income funds, real asset funds, and other funds that aim to offer diversification beyond traditional equity and fixed-income securities. The asset class diversification of the Fund is designed to moderate overall price volatility. The Fund may add, remove, or substitute underlying funds at any time.
The Fund is managed with strategic or long-term asset class targets and target ranges. There is a rebalancing strategy that aligns with the target weights to identify asset classes that are either overweight or underweight. The Fund may shift asset class targets in response to normal evaluative processes, the shortening time horizon of the Fund, or changes in market forces or Fund circumstances.
In selecting underlying funds and target weights, the Fund considers both quantitative measures (e.g., past performance, expected levels of risk and returns, expense levels, diversification, and style consistency) and qualitative factors (e.g., organizational stability, investment experience, investment and risk management processes, and information, trading, and compliance systems). There are no minimum or maximum percentages of assets that the Fund must invest in a specific asset class or underlying fund.
The underlying funds invest in growth and value stocks of small, medium, and large market capitalization companies, fixed-income securities, domestic and foreign (including those in emerging markets) securities, securities denominated in foreign currencies, investment companies (including index funds), and derivatives. A derivative is a financial arrangement, the value of which is derived from, or based on, a traditional security, asset, or market index. The underlying funds principally use equity index futures and options in order to gain exposure to a variety of securities or asset classes or attempt to reduce risk.
The Fund’s asset allocation will become more conservative over time as investment goals near (for example, retirement, which is assumed to begin at age 65) and investors become more risk-averse. Approximately 10 years after its target year, the Fund’s underlying fund allocation is expected to match that of the Principal LifeTime Hybrid Income Fund. At that time, the Fund may be combined with the Principal LifeTime Hybrid Income Fund if the Board of Directors determines that the combination is in the best interests of Fund shareholders. It is expected that at the target date in the Fund’s name, the shareholder will begin gradually withdrawing the account’s value.
LT Hybrid Glidepath.jpg
Risk [Heading] rr_RiskHeading Principal Risks
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
The following information provides some indication of the risks of investing in the Fund. Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. You may get updated performance information at www.PrincipalAM.com.
The bar chart shows the investment returns of the Fund’s Institutional Class shares for each full calendar year of operations for 10 years (or, if shorter, the life of the Fund). The table shows for the last one, five, and ten calendar year periods (or, if shorter, the life of the Fund), how the Fund’s average annual total returns compare with those of one or more broad measures of market performance.
Life of Fund returns are measured from the date the Fund’s shares were first sold (September 30, 2014).
For periods prior to the inception date of Class R-6 shares (August 24, 2015) and Class J shares (March 1, 2018), the performance shown in the table for these newer classes is that of the Fund’s Institutional Class shares, adjusted to reflect the respective fees and expenses of each class. These adjustments result in performance for such periods that is no higher than the historical performance of the Institutional Class shares, which were first sold on September 30, 2014.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following information provides some indication of the risks of investing in the Fund.
Performance Additional Market Index [Text] rr_PerformanceAdditionalMarketIndex The S&P Target Date 2055 Index is included as an additional index for the Fund as it shows how the Fund’s performance compares with the returns of an index of funds with similar investment objectives.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.PrincipalAM.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.
Bar Chart [Heading] rr_BarChartHeading Total Returns as of December 31
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
Highest return for a quarter during the period of the bar chart above:Q2 202018.35 %
Lowest return for a quarter during the period of the bar chart above:Q1 2020(20.52)%
Performance Table Heading rr_PerformanceTableHeading Average Annual Total ReturnsFor the periods ended December 31, 2023
Performance Table Market Index Changed rr_PerformanceTableMarketIndexChanged Effective March 1, 2024, the Fund changed its primary broad-based index to the S&P 1500 TR in order to meet the revised definition of “broad-based securities market index.”
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are shown for Institutional Class shares only and would be different for the other share classes.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock
After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. After-tax returns are shown for Institutional Class shares only and would be different for the other share classes.
Effective March 1, 2024, the Fund changed its primary broad-based index to the S&P 1500 TR in order to meet the revised definition of “broad-based securities market index.” The S&P Target Date 2055 Index is included as an additional index for the Fund as it shows how the Fund’s performance compares with the returns of an index of funds with similar investment objectives.
PFI Prospectus | Principal LifeTime Hybrid 2055 Fund | Risk Lose Money [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Many factors affect that value, and it is possible to lose money by investing in the Fund.
PFI Prospectus | Principal LifeTime Hybrid 2055 Fund | Risk Not Insured Depository Institution [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
PFI Prospectus | Principal LifeTime Hybrid 2055 Fund | Counterparty Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Counterparty Risk. Counterparty risk is the risk that the counterparty to a contract or other obligation will be unable or unwilling to honor its obligations.
PFI Prospectus | Principal LifeTime Hybrid 2055 Fund | Derivatives Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Derivatives Risk. Derivatives may not move in the direction anticipated by the portfolio manager. Transactions in derivatives may increase volatility, cause the liquidation of portfolio positions when not advantageous to do so, and result in disproportionate losses that may be substantially greater than a fund’s initial investment.
•Futures. Futures contracts involve specific risks, including: the imperfect correlation between the change in market value of the instruments held by the Fund and the price of the futures contract; possible lack of a liquid secondary market for a futures contract and the resulting inability to close a futures contract when desired; counterparty risk; and if the Fund has insufficient cash, it may have to sell securities from its portfolio to meet daily variation margin requirements.
•Options. Options involve specific risks, including: the imperfect correlation between the change in market value of the instruments held by the Fund and the price of the options; counterparty risk; difference in trading hours for the options markets and the markets for the underlying securities (rate movements can take place in the underlying markets that cannot be reflected in the options markets); and an insufficient liquid secondary market for particular options.
PFI Prospectus | Principal LifeTime Hybrid 2055 Fund | Derivatives Risk, Futures Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Futures. Futures contracts involve specific risks, including: the imperfect correlation between the change in market value of the instruments held by the Fund and the price of the futures contract; possible lack of a liquid secondary market for a futures contract and the resulting inability to close a futures contract when desired; counterparty risk; and if the Fund has insufficient cash, it may have to sell securities from its portfolio to meet daily variation margin requirements.
PFI Prospectus | Principal LifeTime Hybrid 2055 Fund | Derivatives Risk, Options Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Options. Options involve specific risks, including: the imperfect correlation between the change in market value of the instruments held by the Fund and the price of the options; counterparty risk; difference in trading hours for the options markets and the markets for the underlying securities (rate movements can take place in the underlying markets that cannot be reflected in the options markets); and an insufficient liquid secondary market for particular options.
PFI Prospectus | Principal LifeTime Hybrid 2055 Fund | Emerging Markets Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Emerging Markets Risk. Investments in emerging markets may have more risk than those in developed markets because the emerging markets are less developed and more illiquid. Emerging markets can also be subject to increased social, economic, regulatory, and political uncertainties and can be extremely volatile. The U.S. Securities and Exchange Commission, the U.S. Department of Justice, and other U.S. authorities may be limited in their ability to pursue bad actors in emerging markets, including with respect to fraud.
PFI Prospectus | Principal LifeTime Hybrid 2055 Fund | Equity Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Equity Securities Risk. A variety of factors can negatively impact the value of equity securities held by a fund, including a decline in the issuer’s financial condition, unfavorable performance of the issuer’s sector or industry, or changes in response to overall market and economic conditions. A fund’s principal market segment(s) (such as market capitalization or style) may underperform other market segments or the equity markets as a whole.
•Growth Style Risk. Growth investing entails the risk that if growth companies do not increase their earnings at a rate expected by investors, the market price of their stock may decline significantly, even if earnings show an absolute increase. Growth company stocks also typically lack the dividend yield that can lessen price declines in market downturns.
•Smaller Companies Risk. Investments in smaller companies may involve greater risk and price volatility than investments in larger, more mature companies. Smaller companies may have limited product lines, markets, or financial resources; lack the competitive strength of larger companies; have less experienced managers; or depend on a few key employees. Their securities often are less widely held and trade less frequently and in lesser quantities, and their market prices often fluctuate more, than securities of larger companies.
•Value Style Risk. Value investing entails the risk that value stocks may continue to be undervalued by the market for extended periods, including the entire period during which the stock is held by a fund, or the events that would cause the stock price to increase may not occur as anticipated or at all. Moreover, a stock that appears to be undervalued actually may be appropriately priced at a low level and, therefore, would not be profitable for the fund.
PFI Prospectus | Principal LifeTime Hybrid 2055 Fund | Equity Securities Risk, Growth Style Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Growth Style Risk. Growth investing entails the risk that if growth companies do not increase their earnings at a rate expected by investors, the market price of their stock may decline significantly, even if earnings show an absolute increase. Growth company stocks also typically lack the dividend yield that can lessen price declines in market downturns.
PFI Prospectus | Principal LifeTime Hybrid 2055 Fund | Equity Securities Risk, Smaller Companies Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Smaller Companies Risk. Investments in smaller companies may involve greater risk and price volatility than investments in larger, more mature companies. Smaller companies may have limited product lines, markets, or financial resources; lack the competitive strength of larger companies; have less experienced managers; or depend on a few key employees. Their securities often are less widely held and trade less frequently and in lesser quantities, and their market prices often fluctuate more, than securities of larger companies.
PFI Prospectus | Principal LifeTime Hybrid 2055 Fund | Equity Securities Risk, Value Style Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Value Style Risk. Value investing entails the risk that value stocks may continue to be undervalued by the market for extended periods, including the entire period during which the stock is held by a fund, or the events that would cause the stock price to increase may not occur as anticipated or at all. Moreover, a stock that appears to be undervalued actually may be appropriately priced at a low level and, therefore, would not be profitable for the fund.
PFI Prospectus | Principal LifeTime Hybrid 2055 Fund | Fixed-Income Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Fixed-Income Securities Risk. Fixed-income securities are subject to interest rate, credit quality, and liquidity risks. The market value of fixed-income securities generally declines when interest rates rise, and increased interest rates may adversely affect the liquidity of certain fixed-income securities. Moreover, an issuer of fixed-income securities could default on its payment obligations due to increased interest rates or for other reasons.
PFI Prospectus | Principal LifeTime Hybrid 2055 Fund | Foreign Currency Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Foreign Currency Risk. Risks of investing in securities denominated in, or that trade in, foreign (non-U.S.) currencies include changes in foreign exchange rates and foreign exchange restrictions.
PFI Prospectus | Principal LifeTime Hybrid 2055 Fund | Foreign Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Foreign Securities Risk. The risks of foreign securities include loss of value as a result of: political or economic instability; nationalization, expropriation, or confiscatory taxation; settlement delays; and limited government regulation (including less stringent reporting, accounting, and disclosure standards than are required of U.S. companies).
PFI Prospectus | Principal LifeTime Hybrid 2055 Fund | Fund Of Funds Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Fund of Funds Risk. Fund shareholders bear indirectly their proportionate share of the expenses of other investment companies (for example, other mutual funds or exchange-traded funds) in which the Fund invests (“underlying funds”). The Fund’s selection and weighting of asset classes and allocation of investments in underlying funds may cause it to underperform other funds with a similar investment objective. The Fund’s performance and risks correspond directly to the performance and risks of the underlying funds in which it invests, proportionately in accordance with the weightings of such investments, and there is no assurance that the underlying funds will achieve their investment objectives. Management of the Fund entails potential conflicts of interest: the Fund invests in affiliated underlying funds; and PGI and its affiliates may earn different fees from different underlying funds and may have an incentive to allocate more Fund assets to underlying funds from which they receive higher fees.
PFI Prospectus | Principal LifeTime Hybrid 2055 Fund | Index Fund Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Index Fund Risk. Index funds use a passive investment approach and generally do not attempt to manage market volatility, use defensive strategies, or reduce the effect of any long-term periods of poor investment performance. Therefore, the Fund may hold securities that present risks that an investment advisor researching individual securities might seek to avoid. An index fund has operating and other expenses while an index does not. As a result, over time, index funds tend to underperform the index. The correlation between fund performance and index performance may also be affected by the type of passive investment approach used by a fund (sampling or replication), changes in securities markets, changes in the composition of the index, and the timing of purchases and sales of fund shares. Errors or delays in compiling or rebalancing the Index may impact the performance of the Fund and increase transaction costs.
PFI Prospectus | Principal LifeTime Hybrid 2055 Fund | Portfolio Duration Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Portfolio Duration Risk. Portfolio duration is a measure of the expected life of a fixed-income security and its sensitivity to changes in interest rates. The longer a fund’s average portfolio duration, the more sensitive the fund will be to changes in interest rates, which means funds with longer average portfolio durations may be more volatile than those with shorter durations.
PFI Prospectus | Principal LifeTime Hybrid 2055 Fund | Redemption And Large Transaction Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Redemption and Large Transaction Risk. Ownership of the Fund’s shares may be concentrated in one or a few large investors (such as funds of funds, institutional investors, and asset allocation programs) that may redeem or purchase shares in large quantities. These transactions may cause the Fund to sell securities to meet redemptions or to invest additional cash at times it would not otherwise do so, which may result in increased transaction costs, increased expenses, changes to expense ratios, and adverse effects to Fund performance. Such transactions may also accelerate the realization of taxable income if sales of portfolio securities result in gains. Moreover, reallocations by large shareholders among share classes of a fund may result in changes to the expense ratios of affected classes, which may increase the expenses paid by shareholders of the class that experienced the redemption.
PFI Prospectus | Principal LifeTime Hybrid 2055 Fund | Target Date Fund Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Target Date Fund Risk. A target date fund should not be selected based solely on age or retirement date because there is no guarantee that this Fund will provide adequate income at or through retirement.
PFI Prospectus | Principal LifeTime Hybrid 2055 Fund | S&P 1500 TR (reflects no deduction for fees, expenses, or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
Label rr_AverageAnnualReturnLabel S&P 1500 TR (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 25.47%
5 Years rr_AverageAnnualReturnYear05 15.39%
Since Inception rr_AverageAnnualReturnSinceInception 11.85%
PFI Prospectus | Principal LifeTime Hybrid 2055 Fund | S&P Target Date 2055 Index (reflects no deduction for fees, expenses, or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
Label rr_AverageAnnualReturnLabel S&P Target Date 2055 Index (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 19.62%
5 Years rr_AverageAnnualReturnYear05 10.98%
Since Inception rr_AverageAnnualReturnSinceInception 8.22%
PFI Prospectus | Principal LifeTime Hybrid 2055 Fund | Class J  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PHJBX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.15%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.20%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.37%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.72%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.05%) [49]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.67%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 168
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 225
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 396
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 890
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 68
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 225
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 396
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 890
Label rr_AverageAnnualReturnLabel Class J Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 19.01%
5 Years rr_AverageAnnualReturnYear05 11.13%
Since Inception rr_AverageAnnualReturnSinceInception 8.18%
PFI Prospectus | Principal LifeTime Hybrid 2055 Fund | Institutional Class  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PLTNX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.13%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.37%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.50%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.08%) [49]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.42%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 43
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 152
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 272
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 621
Annual Return 2015 rr_AnnualReturn2015 (0.22%)
Annual Return 2016 rr_AnnualReturn2016 9.44%
Annual Return 2017 rr_AnnualReturn2017 21.04%
Annual Return 2018 rr_AnnualReturn2018 (9.82%)
Annual Return 2019 rr_AnnualReturn2019 26.16%
Annual Return 2020 rr_AnnualReturn2020 15.77%
Annual Return 2021 rr_AnnualReturn2021 19.73%
Annual Return 2022 rr_AnnualReturn2022 (18.50%)
Annual Return 2023 rr_AnnualReturn2023 20.35%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Highest return for a quarter during the period of the bar chart above:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 18.35%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Lowest return for a quarter during the period of the bar chart above:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (20.52%)
Label rr_AverageAnnualReturnLabel Institutional Class Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 20.35%
5 Years rr_AverageAnnualReturnYear05 11.39%
Since Inception rr_AverageAnnualReturnSinceInception 8.45%
PFI Prospectus | Principal LifeTime Hybrid 2055 Fund | Institutional Class | After Taxes on Distributions  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Institutional Class Return After Taxes on Distributions
1 Year rr_AverageAnnualReturnYear01 19.48%
5 Years rr_AverageAnnualReturnYear05 10.16%
Since Inception rr_AverageAnnualReturnSinceInception 7.35%
PFI Prospectus | Principal LifeTime Hybrid 2055 Fund | Institutional Class | After Taxes on Distributions and Sales  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Institutional Class Return After Taxes on Distributions and Sale of Fund Shares
1 Year rr_AverageAnnualReturnYear01 12.54%
5 Years rr_AverageAnnualReturnYear05 8.89%
Since Inception rr_AverageAnnualReturnSinceInception 6.58%
PFI Prospectus | Principal LifeTime Hybrid 2055 Fund | Class R-6  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PLHTX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.06%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.37%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.43%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.04%) [49]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.39%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 40
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 134
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 237
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 538
Label rr_AverageAnnualReturnLabel Class R-6 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 20.33%
5 Years rr_AverageAnnualReturnYear05 11.43%
Since Inception rr_AverageAnnualReturnSinceInception 8.47%
PFI Prospectus | Principal LifeTime Hybrid 2060 Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading PRINCIPAL LIFETIME HYBRID 2060 FUND
Objective [Heading] rr_ObjectiveHeading Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The Fund seeks a total return consisting of long-term growth of capital and current income.
Expense [Heading] rr_ExpenseHeading Fees and Expenses of the Fund
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock
This table describes the fees and expenses that you may pay if you buy, hold, and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below.
If you purchase Institutional Class or Class R-6 shares through certain programs offered by certain financial intermediaries, you may be required to pay a commission and/or other forms of compensation to the broker, or to your Financial Professional or other financial intermediary.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder Fees (fees paid directly from your investment)
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination February 28, 2025
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock
The Fund and each underlying fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs. These costs, which are not reflected in Annual Fund Operating Expenses or in the Example, affect the Fund’s and the underlying funds' performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 7.6% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 7.60%
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. The calculation of costs takes into account any applicable contractual fee waivers and/or expense reimbursements for the period noted in the table above. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, No Redemption, By Year, Caption [Text] rr_ExpenseExampleNoRedemptionByYearCaption With respect to Class J shares, you would pay the following expenses if you did not redeem your shares (all other classes would be the same as in the above example):
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
The Fund operates as a “target date fund” that invests according to an asset allocation strategy designed for investors having a retirement investment goal close to the year in the Fund’s name. The Fund is a fund of funds that invests in underlying funds of Principal Funds, Inc. (“PFI”), with a majority of the Fund’s assets invested in index funds. Its underlying funds consist of domestic and foreign equity funds, fixed-income funds, real asset funds, and other funds that aim to offer diversification beyond traditional equity and fixed-income securities. The asset class diversification of the Fund is designed to moderate overall price volatility. The Fund may add, remove, or substitute underlying funds at any time.
The Fund is managed with strategic or long-term asset class targets and target ranges. There is a rebalancing strategy that aligns with the target weights to identify asset classes that are either overweight or underweight. The Fund may shift asset class targets in response to normal evaluative processes, the shortening time horizon of the Fund, or changes in market forces or Fund circumstances.
In selecting underlying funds and target weights, the Fund considers both quantitative measures (e.g., past performance, expected levels of risk and returns, expense levels, diversification, and style consistency) and qualitative factors (e.g., organizational stability, investment experience, investment and risk management processes, and information, trading, and compliance systems). There are no minimum or maximum percentages of assets that the Fund must invest in a specific asset class or underlying fund.
The underlying funds invest in growth and value stocks of small, medium, and large market capitalization companies, fixed-income securities, domestic and foreign (including those in emerging markets) securities, securities denominated in foreign currencies, investment companies (including index funds), and derivatives. A derivative is a financial arrangement, the value of which is derived from, or based on, a traditional security, asset, or market index. The underlying funds principally use equity index futures and options in order to gain exposure to a variety of securities or asset classes or attempt to reduce risk.
The Fund’s asset allocation will become more conservative over time as investment goals near (for example, retirement, which is assumed to begin at age 65) and investors become more risk-averse. Approximately 10 years after its target year, the Fund’s underlying fund allocation is expected to match that of the Principal LifeTime Hybrid Income Fund. At that time, the Fund may be combined with the Principal LifeTime Hybrid Income Fund if the Board of Directors determines that the combination is in the best interests of Fund shareholders. It is expected that at the target date in the Fund’s name, the shareholder will begin gradually withdrawing the account’s value.
LT Hybrid Glidepath.jpg
Risk [Heading] rr_RiskHeading Principal Risks
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
The following information provides some indication of the risks of investing in the Fund. Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. You may get updated performance information at www.PrincipalAM.com.
The bar chart shows the investment returns of the Fund’s Institutional Class shares for each full calendar year of operations for 10 years (or, if shorter, the life of the Fund). The table shows for the last one, five, and ten calendar year periods (or, if shorter, the life of the Fund), how the Fund’s average annual total returns compare with those of one or more broad measures of market performance.
Life of Fund returns are measured from the date the Fund’s shares were first sold (September 30, 2014).
For periods prior to the inception date of Class R-6 shares (August 24, 2015) and Class J shares (March 1, 2018), the performance shown in the table for these newer classes is that of the Fund’s Institutional Class shares, adjusted to reflect the respective fees and expenses of each class. These adjustments result in performance for such periods that is no higher than the historical performance of the Institutional Class shares, which were first sold on September 30, 2014.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following information provides some indication of the risks of investing in the Fund.
Performance Additional Market Index [Text] rr_PerformanceAdditionalMarketIndex The S&P Target Date 2060 Index is included as an additional index for the Fund as it shows how the Fund’s performance compares with the returns of an index of funds with similar investment objectives.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.PrincipalAM.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.
Bar Chart [Heading] rr_BarChartHeading Total Returns as of December 31
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
Highest return for a quarter during the period of the bar chart above:Q2 202018.71 %
Lowest return for a quarter during the period of the bar chart above:Q1 2020(20.90)%
Performance Table Heading rr_PerformanceTableHeading Average Annual Total ReturnsFor the periods ended December 31, 2023
Performance Table Market Index Changed rr_PerformanceTableMarketIndexChanged Effective March 1, 2024, the Fund changed its primary broad-based index to the S&P 1500 TR in order to meet the revised definition of “broad-based securities market index.”
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are shown for Institutional Class shares only and would be different for the other share classes.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock
After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. After-tax returns are shown for Institutional Class shares only and would be different for the other share classes.
Effective March 1, 2024, the Fund changed its primary broad-based index to the S&P 1500 TR in order to meet the revised definition of “broad-based securities market index.” The S&P Target Date 2060 Index is included as an additional index for the Fund as it shows how the Fund’s performance compares with the returns of an index of funds with similar investment objectives.
PFI Prospectus | Principal LifeTime Hybrid 2060 Fund | Risk Lose Money [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Many factors affect that value, and it is possible to lose money by investing in the Fund.
PFI Prospectus | Principal LifeTime Hybrid 2060 Fund | Risk Not Insured Depository Institution [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
PFI Prospectus | Principal LifeTime Hybrid 2060 Fund | Counterparty Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Counterparty Risk. Counterparty risk is the risk that the counterparty to a contract or other obligation will be unable or unwilling to honor its obligations.
PFI Prospectus | Principal LifeTime Hybrid 2060 Fund | Derivatives Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Derivatives Risk. Derivatives may not move in the direction anticipated by the portfolio manager. Transactions in derivatives may increase volatility, cause the liquidation of portfolio positions when not advantageous to do so, and result in disproportionate losses that may be substantially greater than a fund’s initial investment.
•Futures. Futures contracts involve specific risks, including: the imperfect correlation between the change in market value of the instruments held by the Fund and the price of the futures contract; possible lack of a liquid secondary market for a futures contract and the resulting inability to close a futures contract when desired; counterparty risk; and if the Fund has insufficient cash, it may have to sell securities from its portfolio to meet daily variation margin requirements.
•Options. Options involve specific risks, including: the imperfect correlation between the change in market value of the instruments held by the Fund and the price of the options; counterparty risk; difference in trading hours for the options markets and the markets for the underlying securities (rate movements can take place in the underlying markets that cannot be reflected in the options markets); and an insufficient liquid secondary market for particular options.
PFI Prospectus | Principal LifeTime Hybrid 2060 Fund | Derivatives Risk, Futures Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Futures. Futures contracts involve specific risks, including: the imperfect correlation between the change in market value of the instruments held by the Fund and the price of the futures contract; possible lack of a liquid secondary market for a futures contract and the resulting inability to close a futures contract when desired; counterparty risk; and if the Fund has insufficient cash, it may have to sell securities from its portfolio to meet daily variation margin requirements.
PFI Prospectus | Principal LifeTime Hybrid 2060 Fund | Derivatives Risk, Options Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Options. Options involve specific risks, including: the imperfect correlation between the change in market value of the instruments held by the Fund and the price of the options; counterparty risk; difference in trading hours for the options markets and the markets for the underlying securities (rate movements can take place in the underlying markets that cannot be reflected in the options markets); and an insufficient liquid secondary market for particular options.
PFI Prospectus | Principal LifeTime Hybrid 2060 Fund | Emerging Markets Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Emerging Markets Risk. Investments in emerging markets may have more risk than those in developed markets because the emerging markets are less developed and more illiquid. Emerging markets can also be subject to increased social, economic, regulatory, and political uncertainties and can be extremely volatile. The U.S. Securities and Exchange Commission, the U.S. Department of Justice, and other U.S. authorities may be limited in their ability to pursue bad actors in emerging markets, including with respect to fraud.
PFI Prospectus | Principal LifeTime Hybrid 2060 Fund | Equity Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Equity Securities Risk. A variety of factors can negatively impact the value of equity securities held by a fund, including a decline in the issuer’s financial condition, unfavorable performance of the issuer’s sector or industry, or changes in response to overall market and economic conditions. A fund’s principal market segment(s) (such as market capitalization or style) may underperform other market segments or the equity markets as a whole.
•Growth Style Risk. Growth investing entails the risk that if growth companies do not increase their earnings at a rate expected by investors, the market price of their stock may decline significantly, even if earnings show an absolute increase. Growth company stocks also typically lack the dividend yield that can lessen price declines in market downturns.
•Smaller Companies Risk. Investments in smaller companies may involve greater risk and price volatility than investments in larger, more mature companies. Smaller companies may have limited product lines, markets, or financial resources; lack the competitive strength of larger companies; have less experienced managers; or depend on a few key employees. Their securities often are less widely held and trade less frequently and in lesser quantities, and their market prices often fluctuate more, than securities of larger companies.
•Value Style Risk. Value investing entails the risk that value stocks may continue to be undervalued by the market for extended periods, including the entire period during which the stock is held by a fund, or the events that would cause the stock price to increase may not occur as anticipated or at all. Moreover, a stock that appears to be undervalued actually may be appropriately priced at a low level and, therefore, would not be profitable for the fund.
PFI Prospectus | Principal LifeTime Hybrid 2060 Fund | Equity Securities Risk, Growth Style Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Growth Style Risk. Growth investing entails the risk that if growth companies do not increase their earnings at a rate expected by investors, the market price of their stock may decline significantly, even if earnings show an absolute increase. Growth company stocks also typically lack the dividend yield that can lessen price declines in market downturns.
PFI Prospectus | Principal LifeTime Hybrid 2060 Fund | Equity Securities Risk, Smaller Companies Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Smaller Companies Risk. Investments in smaller companies may involve greater risk and price volatility than investments in larger, more mature companies. Smaller companies may have limited product lines, markets, or financial resources; lack the competitive strength of larger companies; have less experienced managers; or depend on a few key employees. Their securities often are less widely held and trade less frequently and in lesser quantities, and their market prices often fluctuate more, than securities of larger companies.
PFI Prospectus | Principal LifeTime Hybrid 2060 Fund | Equity Securities Risk, Value Style Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Value Style Risk. Value investing entails the risk that value stocks may continue to be undervalued by the market for extended periods, including the entire period during which the stock is held by a fund, or the events that would cause the stock price to increase may not occur as anticipated or at all. Moreover, a stock that appears to be undervalued actually may be appropriately priced at a low level and, therefore, would not be profitable for the fund.
PFI Prospectus | Principal LifeTime Hybrid 2060 Fund | Fixed-Income Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Fixed-Income Securities Risk. Fixed-income securities are subject to interest rate, credit quality, and liquidity risks. The market value of fixed-income securities generally declines when interest rates rise, and increased interest rates may adversely affect the liquidity of certain fixed-income securities. Moreover, an issuer of fixed-income securities could default on its payment obligations due to increased interest rates or for other reasons.
PFI Prospectus | Principal LifeTime Hybrid 2060 Fund | Foreign Currency Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Foreign Currency Risk. Risks of investing in securities denominated in, or that trade in, foreign (non-U.S.) currencies include changes in foreign exchange rates and foreign exchange restrictions.
PFI Prospectus | Principal LifeTime Hybrid 2060 Fund | Foreign Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Foreign Securities Risk. The risks of foreign securities include loss of value as a result of: political or economic instability; nationalization, expropriation, or confiscatory taxation; settlement delays; and limited government regulation (including less stringent reporting, accounting, and disclosure standards than are required of U.S. companies).
PFI Prospectus | Principal LifeTime Hybrid 2060 Fund | Fund Of Funds Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Fund of Funds Risk. Fund shareholders bear indirectly their proportionate share of the expenses of other investment companies (for example, other mutual funds or exchange-traded funds) in which the Fund invests (“underlying funds”). The Fund’s selection and weighting of asset classes and allocation of investments in underlying funds may cause it to underperform other funds with a similar investment objective. The Fund’s performance and risks correspond directly to the performance and risks of the underlying funds in which it invests, proportionately in accordance with the weightings of such investments, and there is no assurance that the underlying funds will achieve their investment objectives. Management of the Fund entails potential conflicts of interest: the Fund invests in affiliated underlying funds; and PGI and its affiliates may earn different fees from different underlying funds and may have an incentive to allocate more Fund assets to underlying funds from which they receive higher fees.
PFI Prospectus | Principal LifeTime Hybrid 2060 Fund | Index Fund Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Index Fund Risk. Index funds use a passive investment approach and generally do not attempt to manage market volatility, use defensive strategies, or reduce the effect of any long-term periods of poor investment performance. Therefore, the Fund may hold securities that present risks that an investment advisor researching individual securities might seek to avoid. An index fund has operating and other expenses while an index does not. As a result, over time, index funds tend to underperform the index. The correlation between fund performance and index performance may also be affected by the type of passive investment approach used by a fund (sampling or replication), changes in securities markets, changes in the composition of the index, and the timing of purchases and sales of fund shares. Errors or delays in compiling or rebalancing the Index may impact the performance of the Fund and increase transaction costs.
PFI Prospectus | Principal LifeTime Hybrid 2060 Fund | Portfolio Duration Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Portfolio Duration Risk. Portfolio duration is a measure of the expected life of a fixed-income security and its sensitivity to changes in interest rates. The longer a fund’s average portfolio duration, the more sensitive the fund will be to changes in interest rates, which means funds with longer average portfolio durations may be more volatile than those with shorter durations.
PFI Prospectus | Principal LifeTime Hybrid 2060 Fund | Redemption And Large Transaction Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Redemption and Large Transaction Risk. Ownership of the Fund’s shares may be concentrated in one or a few large investors (such as funds of funds, institutional investors, and asset allocation programs) that may redeem or purchase shares in large quantities. These transactions may cause the Fund to sell securities to meet redemptions or to invest additional cash at times it would not otherwise do so, which may result in increased transaction costs, increased expenses, changes to expense ratios, and adverse effects to Fund performance. Such transactions may also accelerate the realization of taxable income if sales of portfolio securities result in gains. Moreover, reallocations by large shareholders among share classes of a fund may result in changes to the expense ratios of affected classes, which may increase the expenses paid by shareholders of the class that experienced the redemption.
PFI Prospectus | Principal LifeTime Hybrid 2060 Fund | Target Date Fund Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Target Date Fund Risk. A target date fund should not be selected based solely on age or retirement date because there is no guarantee that this Fund will provide adequate income at or through retirement.
PFI Prospectus | Principal LifeTime Hybrid 2060 Fund | S&P 1500 TR (reflects no deduction for fees, expenses, or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
Label rr_AverageAnnualReturnLabel S&P 1500 TR (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 25.47%
5 Years rr_AverageAnnualReturnYear05 15.39%
Since Inception rr_AverageAnnualReturnSinceInception 11.85%
PFI Prospectus | Principal LifeTime Hybrid 2060 Fund | S&P Target Date 2060 Index (reflects no deduction for fees, expenses, or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
Label rr_AverageAnnualReturnLabel S&P Target Date 2060 Index (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 19.74%
5 Years rr_AverageAnnualReturnYear05 11.04%
Since Inception rr_AverageAnnualReturnSinceInception 8.27%
PFI Prospectus | Principal LifeTime Hybrid 2060 Fund | Class J  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PHJGX
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.15%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.37%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.37%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.89%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.22%) [50]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.67%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 168
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 262
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 472
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,076
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 68
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 262
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 472
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,076
Label rr_AverageAnnualReturnLabel Class J Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 19.06%
5 Years rr_AverageAnnualReturnYear05 11.28%
Since Inception rr_AverageAnnualReturnSinceInception 8.29%
PFI Prospectus | Principal LifeTime Hybrid 2060 Fund | Institutional Class  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PLTHX
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.26%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.37%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.63%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.21%) [50]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.42%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 43
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 181
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 330
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 766
Annual Return 2015 rr_AnnualReturn2015 (0.20%)
Annual Return 2016 rr_AnnualReturn2016 9.67%
Annual Return 2017 rr_AnnualReturn2017 21.33%
Annual Return 2018 rr_AnnualReturn2018 (9.93%)
Annual Return 2019 rr_AnnualReturn2019 26.45%
Annual Return 2020 rr_AnnualReturn2020 16.10%
Annual Return 2021 rr_AnnualReturn2021 20.07%
Annual Return 2022 rr_AnnualReturn2022 (18.52%)
Annual Return 2023 rr_AnnualReturn2023 20.30%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Highest return for a quarter during the period of the bar chart above:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 18.71%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Lowest return for a quarter during the period of the bar chart above:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (20.90%)
Label rr_AverageAnnualReturnLabel Institutional Class Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 20.30%
5 Years rr_AverageAnnualReturnYear05 11.56%
Since Inception rr_AverageAnnualReturnSinceInception 8.57%
PFI Prospectus | Principal LifeTime Hybrid 2060 Fund | Institutional Class | After Taxes on Distributions  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Institutional Class Return After Taxes on Distributions
1 Year rr_AverageAnnualReturnYear01 19.45%
5 Years rr_AverageAnnualReturnYear05 10.41%
Since Inception rr_AverageAnnualReturnSinceInception 7.53%
PFI Prospectus | Principal LifeTime Hybrid 2060 Fund | Institutional Class | After Taxes on Distributions and Sales  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Institutional Class Return After Taxes on Distributions and Sale of Fund Shares
1 Year rr_AverageAnnualReturnYear01 12.49%
5 Years rr_AverageAnnualReturnYear05 9.04%
Since Inception rr_AverageAnnualReturnSinceInception 6.69%
PFI Prospectus | Principal LifeTime Hybrid 2060 Fund | Class R-6  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PLKTX
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.11%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.37%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.48%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.09%) [50]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.39%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 40
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 145
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 260
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 595
Label rr_AverageAnnualReturnLabel Class R-6 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 20.33%
5 Years rr_AverageAnnualReturnYear05 11.60%
Since Inception rr_AverageAnnualReturnSinceInception 8.60%
PFI Prospectus | Principal LifeTime Hybrid 2065 Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading PRINCIPAL LIFETIME HYBRID 2065 FUND
Objective [Heading] rr_ObjectiveHeading Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The Fund seeks a total return consisting of long-term growth of capital and current income.
Expense [Heading] rr_ExpenseHeading Fees and Expenses of the Fund
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock
This table describes the fees and expenses that you may pay if you buy, hold, and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below.
If you purchase Institutional Class or Class R-6 shares through certain programs offered by certain financial intermediaries, you may be required to pay a commission and/or other forms of compensation to the broker, or to your Financial Professional or other financial intermediary.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder Fees (fees paid directly from your investment)
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Fund Operating Expenses(expenses that you pay each year as a percentage of the value of your investment)
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination February 28, 2025
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock
The Fund and each underlying fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs. These costs, which are not reflected in Annual Fund Operating Expenses or in the Example, affect the Fund’s and the underlying funds' performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 16.3% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 16.30%
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. The calculation of costs takes into account any applicable contractual fee waivers and/or expense reimbursements for the period noted in the table above. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, No Redemption, By Year, Caption [Text] rr_ExpenseExampleNoRedemptionByYearCaption With respect to Class J shares, you would pay the following expenses if you did not redeem your shares (all other classes would be the same as in the above example):
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
The Fund operates as a “target date fund” that invests according to an asset allocation strategy designed for investors having a retirement investment goal close to the year in the Fund’s name. The Fund is a fund of funds that invests in underlying funds of Principal Funds, Inc. (“PFI”), with a majority of the Fund’s assets invested in index funds. Its underlying funds consist of domestic and foreign equity funds, fixed-income funds, real asset funds, and other funds that aim to offer diversification beyond traditional equity and fixed-income securities. The asset class diversification of the Fund is designed to moderate overall price volatility. The Fund may add, remove, or substitute underlying funds at any time.
The Fund is managed with strategic or long-term asset class targets and target ranges. There is a rebalancing strategy that aligns with the target weights to identify asset classes that are either overweight or underweight. The Fund may shift asset class targets in response to normal evaluative processes, the shortening time horizon of the Fund, or changes in market forces or Fund circumstances.
In selecting underlying funds and target weights, the Fund considers both quantitative measures (e.g., past performance, expected levels of risk and returns, expense levels, diversification, and style consistency) and qualitative factors (e.g., organizational stability, investment experience, investment and risk management processes, and information, trading, and compliance systems). There are no minimum or maximum percentages of assets that the Fund must invest in a specific asset class or underlying fund.
The underlying funds invest in growth and value stocks of small, medium, and large market capitalization companies, fixed-income securities, domestic and foreign (including those in emerging markets) securities, securities denominated in foreign currencies, investment companies (including index funds), and derivatives. A derivative is a financial arrangement, the value of which is derived from, or based on, a traditional security, asset, or market index. The underlying funds principally use equity index futures and options in order to gain exposure to a variety of securities or asset classes or attempt to reduce risk.
The Fund’s asset allocation will become more conservative over time as investment goals near (for example, retirement, which is assumed to begin at age 65) and investors become more risk-averse. Approximately 10 years after its target year, the Fund’s underlying fund allocation is expected to match that of the Principal LifeTime Hybrid Income Fund. At that time, the Fund may be combined with the Principal LifeTime Hybrid Income Fund if the Board of Directors determines that the combination is in the best interests of Fund shareholders. It is expected that at the target date in the Fund’s name, the shareholder will begin gradually withdrawing the account’s value.
LT Hybrid Glidepath.jpg
Risk [Heading] rr_RiskHeading Principal Risks
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
The following information provides some indication of the risks of investing in the Fund. Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. You may get updated performance information at www.PrincipalAM.com.
The bar chart shows the investment returns of the Fund’s Institutional Class shares for each full calendar year of operations for 10 years (or, if shorter, the life of the Fund). The table shows for the last one, five, and ten calendar year periods (or, if shorter, the life of the Fund), how the Fund’s average annual total returns compare with those of one or more broad measures of market performance.
Life of Fund returns are measured from the date the Fund’s shares were first sold (September 6, 2017).
For periods prior to the inception date of Class J shares (March 1, 2018), the performance shown in the table for Class J shares is that of the Fund’s Institutional Class shares, adjusted to reflect the fees and expenses of Class J shares. These adjustments result in performance for such periods that is no higher than the historical performance of the Institutional Class shares, which were first sold on September 6, 2017.
During 2018, Class R-6 experienced a one-time loss of approximately $0.33 per share as a result of a large redemption. If such loss had not been recognized, the total return amounts expressed herein would have been higher. During May of 2019, Class R-6 experienced a one-time gain of approximately $0.35 per share as a result of a reimbursement by PGI, the investment advisor. If such gain had not been recognized, the total return amounts expressed herein would have been lower.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following information provides some indication of the risks of investing in the Fund.
Performance Additional Market Index [Text] rr_PerformanceAdditionalMarketIndex The S&P Target Date 2065+ Index is included as an additional index for the Fund as it shows how the Fund’s performance compares with the returns of an index of funds with similar investment objectives.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.PrincipalAM.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.
Bar Chart [Heading] rr_BarChartHeading Total Returns as of December 31
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
Highest return for a quarter during the period of the bar chart above:Q2 202019.12 %
Lowest return for a quarter during the period of the bar chart above:Q1 2020(21.10)%
Performance Table Heading rr_PerformanceTableHeading Average Annual Total ReturnsFor the periods ended December 31, 2023
Performance Table Market Index Changed rr_PerformanceTableMarketIndexChanged Effective March 1, 2024, the Fund changed its primary broad-based index to the S&P 1500 TR in order to meet the revised definition of “broad-based securities market index.”
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are shown for Institutional Class shares only and would be different for the other share classes.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock
After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. After-tax returns are shown for Institutional Class shares only and would be different for the other share classes.
Effective March 1, 2024, the Fund changed its primary broad-based index to the S&P 1500 TR in order to meet the revised definition of “broad-based securities market index.” The S&P Target Date 2065+ Index is included as an additional index for the Fund as it shows how the Fund’s performance compares with the returns of an index of funds with similar investment objectives.
PFI Prospectus | Principal LifeTime Hybrid 2065 Fund | Risk Lose Money [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Many factors affect that value, and it is possible to lose money by investing in the Fund.
PFI Prospectus | Principal LifeTime Hybrid 2065 Fund | Risk Not Insured Depository Institution [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
PFI Prospectus | Principal LifeTime Hybrid 2065 Fund | Counterparty Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Counterparty Risk. Counterparty risk is the risk that the counterparty to a contract or other obligation will be unable or unwilling to honor its obligations.
PFI Prospectus | Principal LifeTime Hybrid 2065 Fund | Derivatives Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Derivatives Risk. Derivatives may not move in the direction anticipated by the portfolio manager. Transactions in derivatives may increase volatility, cause the liquidation of portfolio positions when not advantageous to do so, and result in disproportionate losses that may be substantially greater than a fund’s initial investment.
•Futures. Futures contracts involve specific risks, including: the imperfect correlation between the change in market value of the instruments held by the Fund and the price of the futures contract; possible lack of a liquid secondary market for a futures contract and the resulting inability to close a futures contract when desired; counterparty risk; and if the Fund has insufficient cash, it may have to sell securities from its portfolio to meet daily variation margin requirements.
•Options. Options involve specific risks, including: the imperfect correlation between the change in market value of the instruments held by the Fund and the price of the options; counterparty risk; difference in trading hours for the options markets and the markets for the underlying securities (rate movements can take place in the underlying markets that cannot be reflected in the options markets); and an insufficient liquid secondary market for particular options.
PFI Prospectus | Principal LifeTime Hybrid 2065 Fund | Derivatives Risk, Futures Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Futures. Futures contracts involve specific risks, including: the imperfect correlation between the change in market value of the instruments held by the Fund and the price of the futures contract; possible lack of a liquid secondary market for a futures contract and the resulting inability to close a futures contract when desired; counterparty risk; and if the Fund has insufficient cash, it may have to sell securities from its portfolio to meet daily variation margin requirements.
PFI Prospectus | Principal LifeTime Hybrid 2065 Fund | Derivatives Risk, Options Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Options. Options involve specific risks, including: the imperfect correlation between the change in market value of the instruments held by the Fund and the price of the options; counterparty risk; difference in trading hours for the options markets and the markets for the underlying securities (rate movements can take place in the underlying markets that cannot be reflected in the options markets); and an insufficient liquid secondary market for particular options.
PFI Prospectus | Principal LifeTime Hybrid 2065 Fund | Emerging Markets Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Emerging Markets Risk. Investments in emerging markets may have more risk than those in developed markets because the emerging markets are less developed and more illiquid. Emerging markets can also be subject to increased social, economic, regulatory, and political uncertainties and can be extremely volatile. The U.S. Securities and Exchange Commission, the U.S. Department of Justice, and other U.S. authorities may be limited in their ability to pursue bad actors in emerging markets, including with respect to fraud.
PFI Prospectus | Principal LifeTime Hybrid 2065 Fund | Equity Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Equity Securities Risk. A variety of factors can negatively impact the value of equity securities held by a fund, including a decline in the issuer’s financial condition, unfavorable performance of the issuer’s sector or industry, or changes in response to overall market and economic conditions. A fund’s principal market segment(s) (such as market capitalization or style) may underperform other market segments or the equity markets as a whole.
•Growth Style Risk. Growth investing entails the risk that if growth companies do not increase their earnings at a rate expected by investors, the market price of their stock may decline significantly, even if earnings show an absolute increase. Growth company stocks also typically lack the dividend yield that can lessen price declines in market downturns.
•Smaller Companies Risk. Investments in smaller companies may involve greater risk and price volatility than investments in larger, more mature companies. Smaller companies may have limited product lines, markets, or financial resources; lack the competitive strength of larger companies; have less experienced managers; or depend on a few key employees. Their securities often are less widely held and trade less frequently and in lesser quantities, and their market prices often fluctuate more, than securities of larger companies.
•Value Style Risk. Value investing entails the risk that value stocks may continue to be undervalued by the market for extended periods, including the entire period during which the stock is held by a fund, or the events that would cause the stock price to increase may not occur as anticipated or at all. Moreover, a stock that appears to be undervalued actually may be appropriately priced at a low level and, therefore, would not be profitable for the fund.
PFI Prospectus | Principal LifeTime Hybrid 2065 Fund | Equity Securities Risk, Growth Style Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Growth Style Risk. Growth investing entails the risk that if growth companies do not increase their earnings at a rate expected by investors, the market price of their stock may decline significantly, even if earnings show an absolute increase. Growth company stocks also typically lack the dividend yield that can lessen price declines in market downturns.
PFI Prospectus | Principal LifeTime Hybrid 2065 Fund | Equity Securities Risk, Smaller Companies Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Smaller Companies Risk. Investments in smaller companies may involve greater risk and price volatility than investments in larger, more mature companies. Smaller companies may have limited product lines, markets, or financial resources; lack the competitive strength of larger companies; have less experienced managers; or depend on a few key employees. Their securities often are less widely held and trade less frequently and in lesser quantities, and their market prices often fluctuate more, than securities of larger companies.
PFI Prospectus | Principal LifeTime Hybrid 2065 Fund | Equity Securities Risk, Value Style Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Value Style Risk. Value investing entails the risk that value stocks may continue to be undervalued by the market for extended periods, including the entire period during which the stock is held by a fund, or the events that would cause the stock price to increase may not occur as anticipated or at all. Moreover, a stock that appears to be undervalued actually may be appropriately priced at a low level and, therefore, would not be profitable for the fund.
PFI Prospectus | Principal LifeTime Hybrid 2065 Fund | Fixed-Income Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Fixed-Income Securities Risk. Fixed-income securities are subject to interest rate, credit quality, and liquidity risks. The market value of fixed-income securities generally declines when interest rates rise, and increased interest rates may adversely affect the liquidity of certain fixed-income securities. Moreover, an issuer of fixed-income securities could default on its payment obligations due to increased interest rates or for other reasons.
PFI Prospectus | Principal LifeTime Hybrid 2065 Fund | Foreign Currency Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Foreign Currency Risk. Risks of investing in securities denominated in, or that trade in, foreign (non-U.S.) currencies include changes in foreign exchange rates and foreign exchange restrictions.
PFI Prospectus | Principal LifeTime Hybrid 2065 Fund | Foreign Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Foreign Securities Risk. The risks of foreign securities include loss of value as a result of: political or economic instability; nationalization, expropriation, or confiscatory taxation; settlement delays; and limited government regulation (including less stringent reporting, accounting, and disclosure standards than are required of U.S. companies).
PFI Prospectus | Principal LifeTime Hybrid 2065 Fund | Fund Of Funds Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Fund of Funds Risk. Fund shareholders bear indirectly their proportionate share of the expenses of other investment companies (for example, other mutual funds or exchange-traded funds) in which the Fund invests (“underlying funds”). The Fund’s selection and weighting of asset classes and allocation of investments in underlying funds may cause it to underperform other funds with a similar investment objective. The Fund’s performance and risks correspond directly to the performance and risks of the underlying funds in which it invests, proportionately in accordance with the weightings of such investments, and there is no assurance that the underlying funds will achieve their investment objectives. Management of the Fund entails potential conflicts of interest: the Fund invests in affiliated underlying funds; and PGI and its affiliates may earn different fees from different underlying funds and may have an incentive to allocate more Fund assets to underlying funds from which they receive higher fees.
PFI Prospectus | Principal LifeTime Hybrid 2065 Fund | Index Fund Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Index Fund Risk. Index funds use a passive investment approach and generally do not attempt to manage market volatility, use defensive strategies, or reduce the effect of any long-term periods of poor investment performance. Therefore, the Fund may hold securities that present risks that an investment advisor researching individual securities might seek to avoid. An index fund has operating and other expenses while an index does not. As a result, over time, index funds tend to underperform the index. The correlation between fund performance and index performance may also be affected by the type of passive investment approach used by a fund (sampling or replication), changes in securities markets, changes in the composition of the index, and the timing of purchases and sales of fund shares. Errors or delays in compiling or rebalancing the Index may impact the performance of the Fund and increase transaction costs.
PFI Prospectus | Principal LifeTime Hybrid 2065 Fund | Portfolio Duration Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Portfolio Duration Risk. Portfolio duration is a measure of the expected life of a fixed-income security and its sensitivity to changes in interest rates. The longer a fund’s average portfolio duration, the more sensitive the fund will be to changes in interest rates, which means funds with longer average portfolio durations may be more volatile than those with shorter durations.
PFI Prospectus | Principal LifeTime Hybrid 2065 Fund | Redemption And Large Transaction Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Redemption and Large Transaction Risk. Ownership of the Fund’s shares may be concentrated in one or a few large investors (such as funds of funds, institutional investors, and asset allocation programs) that may redeem or purchase shares in large quantities. These transactions may cause the Fund to sell securities to meet redemptions or to invest additional cash at times it would not otherwise do so, which may result in increased transaction costs, increased expenses, changes to expense ratios, and adverse effects to Fund performance. Such transactions may also accelerate the realization of taxable income if sales of portfolio securities result in gains. Moreover, reallocations by large shareholders among share classes of a fund may result in changes to the expense ratios of affected classes, which may increase the expenses paid by shareholders of the class that experienced the redemption.
PFI Prospectus | Principal LifeTime Hybrid 2065 Fund | Target Date Fund Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Target Date Fund Risk. A target date fund should not be selected based solely on age or retirement date because there is no guarantee that this Fund will provide adequate income at or through retirement.
PFI Prospectus | Principal LifeTime Hybrid 2065 Fund | S&P 1500 TR (reflects no deduction for fees, expenses, or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
Label rr_AverageAnnualReturnLabel S&P 1500 TR (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 25.47%
5 Years rr_AverageAnnualReturnYear05 15.39%
Since Inception rr_AverageAnnualReturnSinceInception 12.72%
PFI Prospectus | Principal LifeTime Hybrid 2065 Fund | S&P Target Date 2065+ Index (reflects no deduction for fees, expenses, or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
Label rr_AverageAnnualReturnLabel S&P Target Date 2065+ Index (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 19.84%
5 Years rr_AverageAnnualReturnYear05 11.09%
Since Inception rr_AverageAnnualReturnSinceInception 8.61%
PFI Prospectus | Principal LifeTime Hybrid 2065 Fund | Class J  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PHJDX
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.15%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.72%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.37%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.24%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.57%) [51]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.67%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 168
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 337
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 626
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,450
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 68
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 337
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 626
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,450
Label rr_AverageAnnualReturnLabel Class J Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 19.04%
5 Years rr_AverageAnnualReturnYear05 11.46%
Since Inception rr_AverageAnnualReturnSinceInception 8.34%
PFI Prospectus | Principal LifeTime Hybrid 2065 Fund | Institutional Class  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PLHHX
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 1.24%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.37%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.61%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (1.19%) [51]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.42%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 43
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 391
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 763
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,810
Annual Return 2018 rr_AnnualReturn2018 (10.20%)
Annual Return 2019 rr_AnnualReturn2019 27.01%
Annual Return 2020 rr_AnnualReturn2020 16.49%
Annual Return 2021 rr_AnnualReturn2021 20.30%
Annual Return 2022 rr_AnnualReturn2022 (18.54%)
Annual Return 2023 rr_AnnualReturn2023 20.34%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Highest return for a quarter during the period of the bar chart above:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 19.12%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Lowest return for a quarter during the period of the bar chart above:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (21.10%)
Label rr_AverageAnnualReturnLabel Institutional Class Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 20.34%
5 Years rr_AverageAnnualReturnYear05 11.78%
Since Inception rr_AverageAnnualReturnSinceInception 8.65%
PFI Prospectus | Principal LifeTime Hybrid 2065 Fund | Institutional Class | After Taxes on Distributions  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Institutional Class Return After Taxes on Distributions
1 Year rr_AverageAnnualReturnYear01 19.53%
5 Years rr_AverageAnnualReturnYear05 10.92%
Since Inception rr_AverageAnnualReturnSinceInception 7.74%
PFI Prospectus | Principal LifeTime Hybrid 2065 Fund | Institutional Class | After Taxes on Distributions and Sales  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Institutional Class Return After Taxes on Distributions and Sale of Fund Shares
1 Year rr_AverageAnnualReturnYear01 12.50%
5 Years rr_AverageAnnualReturnYear05 9.27%
Since Inception rr_AverageAnnualReturnSinceInception 6.69%
PFI Prospectus | Principal LifeTime Hybrid 2065 Fund | Class R-6  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PLHRX
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.34%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.37%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.71%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.32%) [51]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.39%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 40
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 195
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 363
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 852
Label rr_AverageAnnualReturnLabel Class R-6 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 20.33%
5 Years rr_AverageAnnualReturnYear05 12.56% [52]
Since Inception rr_AverageAnnualReturnSinceInception 8.68% [52],[53]
PFI Prospectus | Principal LifeTime Hybrid 2070 Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading PRINCIPAL LIFETIME HYBRID 2070 FUND
Objective [Heading] rr_ObjectiveHeading Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The Fund seeks a total return consisting of long-term growth of capital and current income.
Expense [Heading] rr_ExpenseHeading Fees and Expenses of the Fund
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock
This table describes the fees and expenses that you may pay if you buy, hold, and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below.
If you purchase Institutional Class or Class R-6 shares through certain programs offered by certain financial intermediaries, you may be required to pay a commission and/or other forms of compensation to the broker, or to your Financial Professional or other financial intermediary.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder Fees (fees paid directly from your investment)
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination February 28, 2025
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock
The Fund and each underlying fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs. These costs, which are not reflected in Annual Fund Operating Expenses or in the Example, affect the Fund’s and the underlying funds' performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 130.0% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 130.00%
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. The calculation of costs takes into account any applicable contractual fee waivers and/or expense reimbursements for the period noted in the table above. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, No Redemption, By Year, Caption [Text] rr_ExpenseExampleNoRedemptionByYearCaption With respect to Class J shares, you would pay the following expenses if you did not redeem your shares (all other classes would be the same as in the above example):
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
The Fund operates as a “target date fund” that invests according to an asset allocation strategy designed for investors having a retirement investment goal close to the year in the Fund’s name. The Fund is a fund of funds that invests in underlying funds of Principal Funds, Inc. (“PFI”), with a majority of the Fund’s assets invested in index funds. Its underlying funds consist of domestic and foreign equity funds, fixed-income funds, real asset funds, and other funds that aim to offer diversification beyond traditional equity and fixed-income securities. The asset class diversification of the Fund is designed to moderate overall price volatility. The Fund may add, remove, or substitute underlying funds at any time. The Fund’s strategies may result in the active and frequent trading of the Fund’s portfolio securities.
The Fund is managed with strategic or long-term asset class targets and target ranges. There is a rebalancing strategy that aligns with the target weights to identify asset classes that are either overweight or underweight. The Fund may shift asset class targets in response to normal evaluative processes, the shortening time horizon of the Fund, or changes in market forces or Fund circumstances.
In selecting underlying funds and target weights, Principal Global Investors, LLC (“PGI”), the Fund’s investment advisor, considers both quantitative measures (e.g., past performance, expected levels of risk and returns, expense levels, diversification, and style consistency) and qualitative factors (e.g., organizational stability, investment experience, investment and risk management processes, and information, trading, and compliance systems). There are no minimum or maximum percentages of assets that the Fund must invest in a specific asset class or underlying fund.
The underlying funds invest in growth and value stocks of small, medium, and large market capitalization companies, fixed-income securities, domestic and foreign (including those in emerging markets) securities, securities denominated in foreign currencies, investment companies (including index funds), and derivatives. A derivative is a financial arrangement, the value of which is derived from, or based on, a traditional security, asset, or market index. The underlying funds principally use equity index futures and options in order to gain exposure to a variety of securities or asset classes or attempt to reduce risk.
The Fund’s asset allocation will become more conservative over time as investment goals near (for example, retirement, which is assumed to begin at age 65) and investors become more risk-averse. Approximately 10 years after its target year, the Fund’s underlying fund allocation is expected to match that of the Principal LifeTime Hybrid Income Fund. At that time, the Fund may be combined with the Principal LifeTime Hybrid Income Fund if the Board of Directors determines that the combination is in the best interests of Fund shareholders. It is expected that at the target date in the Fund’s name, the shareholder will begin gradually withdrawing the account’s value.
LT Hybrid Glidepath.jpg
Risk [Heading] rr_RiskHeading Principal Risks
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
No performance information is shown below because the Fund has not yet had a calendar year of performance. The Fund’s performance is benchmarked against the S&P 1500 TR and the S&P Target Date 65+ Index. Performance information provides an indication of the risks of investing in the Fund. Past performance is not necessarily an indication of how the Fund will perform in the future. You may get updated performance information at www.PrincipalAM.com.
Effective March 1, 2024 the Fund changed its primary broad-based index to the S&P 1500 TR in order to meet the revised definition of "broad-based securities market index." The S&P Target Date 2065+ Index is included as an additional index for the Fund as it shows how the Fund's performance compares with returns of an index of funds with similar investment objectives.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The Fund’s performance is benchmarked against the S&P 1500 TR and the S&P Target Date 65+ Index. Performance information provides an indication of the risks of investing in the Fund.
Performance One Year or Less [Text] rr_PerformanceOneYearOrLess No performance information is shown below because the Fund has not yet had a calendar year of performance.
Performance Additional Market Index [Text] rr_PerformanceAdditionalMarketIndex The S&P Target Date 2065+ Index is included as an additional index for the Fund as it shows how the Fund's performance compares with returns of an index of funds with similar investment objectives.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.PrincipalAM.com.
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Past performance is not necessarily an indication of how the Fund will perform in the future.
Performance Table Market Index Changed rr_PerformanceTableMarketIndexChanged Effective March 1, 2024 the Fund changed its primary broad-based index to the S&P 1500 TR in order to meet the revised definition of "broad-based securities market index."
PFI Prospectus | Principal LifeTime Hybrid 2070 Fund | Risk Lose Money [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Many factors affect that value, and it is possible to lose money by investing in the Fund.
PFI Prospectus | Principal LifeTime Hybrid 2070 Fund | Risk Not Insured Depository Institution [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
PFI Prospectus | Principal LifeTime Hybrid 2070 Fund | Counterparty Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Counterparty Risk. Counterparty risk is the risk that the counterparty to a contract or other obligation will be unable or unwilling to honor its obligations.
PFI Prospectus | Principal LifeTime Hybrid 2070 Fund | Derivatives Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Derivatives Risk. Derivatives may not move in the direction anticipated by the portfolio manager. Transactions in derivatives may increase volatility, cause the liquidation of portfolio positions when not advantageous to do so, and result in disproportionate losses that may be substantially greater than a fund’s initial investment.
•Futures. Futures contracts involve specific risks, including: the imperfect correlation between the change in market value of the instruments held by the Fund and the price of the futures contract; possible lack of a liquid secondary market for a futures contract and the resulting inability to close a futures contract when desired; counterparty risk; and if the Fund has insufficient cash, it may have to sell securities from its portfolio to meet daily variation margin requirements.
•Options. Options involve specific risks, including: the imperfect correlation between the change in market value of the instruments held by the Fund and the price of the options; counterparty risk; difference in trading hours for the options markets and the markets for the underlying securities (rate movements can take place in the underlying markets that cannot be reflected in the options markets); and an insufficient liquid secondary market for particular options.
PFI Prospectus | Principal LifeTime Hybrid 2070 Fund | Derivatives Risk, Futures Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Futures. Futures contracts involve specific risks, including: the imperfect correlation between the change in market value of the instruments held by the Fund and the price of the futures contract; possible lack of a liquid secondary market for a futures contract and the resulting inability to close a futures contract when desired; counterparty risk; and if the Fund has insufficient cash, it may have to sell securities from its portfolio to meet daily variation margin requirements.
PFI Prospectus | Principal LifeTime Hybrid 2070 Fund | Derivatives Risk, Options Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Options. Options involve specific risks, including: the imperfect correlation between the change in market value of the instruments held by the Fund and the price of the options; counterparty risk; difference in trading hours for the options markets and the markets for the underlying securities (rate movements can take place in the underlying markets that cannot be reflected in the options markets); and an insufficient liquid secondary market for particular options.
PFI Prospectus | Principal LifeTime Hybrid 2070 Fund | Emerging Markets Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Emerging Markets Risk. Investments in emerging markets may have more risk than those in developed markets because the emerging markets are less developed and more illiquid. Emerging markets can also be subject to increased social, economic, regulatory, and political uncertainties and can be extremely volatile. The U.S. Securities and Exchange Commission, the U.S. Department of Justice, and other U.S. authorities may be limited in their ability to pursue bad actors in emerging markets, including with respect to fraud.
PFI Prospectus | Principal LifeTime Hybrid 2070 Fund | Equity Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Equity Securities Risk. A variety of factors can negatively impact the value of equity securities held by a fund, including a decline in the issuer’s financial condition, unfavorable performance of the issuer’s sector or industry, or changes in response to overall market and economic conditions. A fund’s principal market segment(s) (such as market capitalization or style) may underperform other market segments or the equity markets as a whole.
•Growth Style Risk. Growth investing entails the risk that if growth companies do not increase their earnings at a rate expected by investors, the market price of their stock may decline significantly, even if earnings show an absolute increase. Growth company stocks also typically lack the dividend yield that can lessen price declines in market downturns.
•Smaller Companies Risk. Investments in smaller companies may involve greater risk and price volatility than investments in larger, more mature companies. Smaller companies may have limited product lines, markets, or financial resources; lack the competitive strength of larger companies; have less experienced managers; or depend on a few key employees. Their securities often are less widely held and trade less frequently and in lesser quantities, and their market prices often fluctuate more, than securities of larger companies.
•Value Style Risk. Value investing entails the risk that value stocks may continue to be undervalued by the market for extended periods, including the entire period during which the stock is held by a fund, or the events that would cause the stock price to increase may not occur as anticipated or at all. Moreover, a stock that appears to be undervalued actually may be appropriately priced at a low level and, therefore, would not be profitable for the fund.
PFI Prospectus | Principal LifeTime Hybrid 2070 Fund | Equity Securities Risk, Growth Style Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Growth Style Risk. Growth investing entails the risk that if growth companies do not increase their earnings at a rate expected by investors, the market price of their stock may decline significantly, even if earnings show an absolute increase. Growth company stocks also typically lack the dividend yield that can lessen price declines in market downturns.
PFI Prospectus | Principal LifeTime Hybrid 2070 Fund | Equity Securities Risk, Smaller Companies Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Smaller Companies Risk. Investments in smaller companies may involve greater risk and price volatility than investments in larger, more mature companies. Smaller companies may have limited product lines, markets, or financial resources; lack the competitive strength of larger companies; have less experienced managers; or depend on a few key employees. Their securities often are less widely held and trade less frequently and in lesser quantities, and their market prices often fluctuate more, than securities of larger companies.
PFI Prospectus | Principal LifeTime Hybrid 2070 Fund | Equity Securities Risk, Value Style Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Value Style Risk. Value investing entails the risk that value stocks may continue to be undervalued by the market for extended periods, including the entire period during which the stock is held by a fund, or the events that would cause the stock price to increase may not occur as anticipated or at all. Moreover, a stock that appears to be undervalued actually may be appropriately priced at a low level and, therefore, would not be profitable for the fund.
PFI Prospectus | Principal LifeTime Hybrid 2070 Fund | Fixed-Income Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Fixed-Income Securities Risk. Fixed-income securities are subject to interest rate, credit quality, and liquidity risks. The market value of fixed-income securities generally declines when interest rates rise, and increased interest rates may adversely affect the liquidity of certain fixed-income securities. Moreover, an issuer of fixed-income securities could default on its payment obligations due to increased interest rates or for other reasons.
PFI Prospectus | Principal LifeTime Hybrid 2070 Fund | Foreign Currency Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Foreign Currency Risk. Risks of investing in securities denominated in, or that trade in, foreign (non-U.S.) currencies include changes in foreign exchange rates and foreign exchange restrictions.
PFI Prospectus | Principal LifeTime Hybrid 2070 Fund | Foreign Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Foreign Securities Risk. The risks of foreign securities include loss of value as a result of: political or economic instability; nationalization, expropriation, or confiscatory taxation; settlement delays; and limited government regulation (including less stringent reporting, accounting, and disclosure standards than are required of U.S. companies).
PFI Prospectus | Principal LifeTime Hybrid 2070 Fund | Fund Of Funds Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Fund of Funds Risk. Fund shareholders bear indirectly their proportionate share of the expenses of other investment companies (for example, other mutual funds or exchange-traded funds) in which the Fund invests (“underlying funds”). The Fund’s selection and weighting of asset classes and allocation of investments in underlying funds may cause it to underperform other funds with a similar investment objective. The Fund’s performance and risks correspond directly to the performance and risks of the underlying funds in which it invests, proportionately in accordance with the weightings of such investments, and there is no assurance that the underlying funds will achieve their investment objectives. Management of the Fund entails potential conflicts of interest: the Fund invests in affiliated underlying funds; and PGI and its affiliates may earn different fees from different underlying funds and may have an incentive to allocate more Fund assets to underlying funds from which they receive higher fees.
PFI Prospectus | Principal LifeTime Hybrid 2070 Fund | High Portfolio Turnover Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock High Portfolio Turnover Risk. High portfolio turnover (more than 100%) caused by active and frequent trading of portfolio securities may result in accelerating the realization of taxable gains and losses, lower fund performance, and increased brokerage costs.
PFI Prospectus | Principal LifeTime Hybrid 2070 Fund | Index Fund Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Index Fund Risk. Index funds use a passive investment approach and generally do not attempt to manage market volatility, use defensive strategies, or reduce the effect of any long-term periods of poor investment performance. Therefore, the Fund may hold securities that present risks that an investment advisor researching individual securities might seek to avoid. An index fund has operating and other expenses while an index does not. As a result, over time, index funds tend to underperform the index. The correlation between fund performance and index performance may also be affected by the type of passive investment approach used by a fund (sampling or replication), changes in securities markets, changes in the composition of the index, and the timing of purchases and sales of fund shares. Errors or delays in compiling or rebalancing the Index may impact the performance of the Fund and increase transaction costs.
PFI Prospectus | Principal LifeTime Hybrid 2070 Fund | Portfolio Duration Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Portfolio Duration Risk. Portfolio duration is a measure of the expected life of a fixed-income security and its sensitivity to changes in interest rates. The longer a fund’s average portfolio duration, the more sensitive the fund will be to changes in interest rates, which means funds with longer average portfolio durations may be more volatile than those with shorter durations.
PFI Prospectus | Principal LifeTime Hybrid 2070 Fund | Redemption And Large Transaction Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Redemption and Large Transaction Risk. Ownership of the Fund’s shares may be concentrated in one or a few large investors (such as funds of funds, institutional investors, and asset allocation programs) that may redeem or purchase shares in large quantities. These transactions may cause the Fund to sell securities to meet redemptions or to invest additional cash at times it would not otherwise do so, which may result in increased transaction costs, increased expenses, changes to expense ratios, and adverse effects to Fund performance. Such transactions may also accelerate the realization of taxable income if sales of portfolio securities result in gains. Moreover, reallocations by large shareholders among share classes of a fund may result in changes to the expense ratios of affected classes, which may increase the expenses paid by shareholders of the class that experienced the redemption.
PFI Prospectus | Principal LifeTime Hybrid 2070 Fund | Target Date Fund Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Target Date Fund Risk. A target date fund should not be selected based solely on age or retirement date because there is no guarantee that this Fund will provide adequate income at or through retirement.
PFI Prospectus | Principal LifeTime Hybrid 2070 Fund | Class J  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PLKJX
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.15%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 40.37%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.40%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 40.92%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (40.22%) [54]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.70%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 172
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 5,817
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 8,176
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 9,642
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 72
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 5,817
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 8,176
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 9,642
PFI Prospectus | Principal LifeTime Hybrid 2070 Fund | Institutional Class  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PLKSX
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 186.86%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.40%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 187.26%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (186.81%) [54]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.45%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 46
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 354
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 563
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,163
PFI Prospectus | Principal LifeTime Hybrid 2070 Fund | Class R-6  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PLKRX
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 40.81%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.40%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 41.21%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (40.79%) [54]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.42%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 43
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 5,824
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 8,176
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 9,620
PFI Prospectus | Real Estate Securities Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading REAL ESTATE SECURITIES FUND
Objective [Heading] rr_ObjectiveHeading Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The Fund seeks to generate a total return.
Expense [Heading] rr_ExpenseHeading Fees and Expenses of the Fund
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock
This table describes the fees and expenses that you may pay if you buy, hold, and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in Class A Shares of Principal Funds, Inc. More information about these and other discounts is available from your financial intermediary and in “Choosing a Share Class and The Costs of Investing” beginning on page 426 of the Fund’s Prospectus, Appendix B to the Prospectus titled “Intermediary-Specific Sales Charge Waivers and Reductions,” and “Multiple Class Structure” beginning on page 70 of the Fund’s Statement of Additional Information.
If you purchase Institutional Class or Class R-6 shares through certain programs offered by certain financial intermediaries, you may be required to pay a commission and/or other forms of compensation to the broker, or to your Financial Professional or other financial intermediary.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder Fees (fees paid directly from your investment)
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination February 28, 2025
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock
The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in Annual Fund Operating Expenses or in the Example, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 16.1% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 16.10%
Expense Breakpoint Discounts [Text] rr_ExpenseBreakpointDiscounts You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in Class A Shares of Principal Funds, Inc.
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 50,000
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example assumes conversion of the Class C shares to Class A shares after the eighth year. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. The calculation of costs takes into account any applicable contractual fee waivers and/or expense reimbursements for the period noted in the table above. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, No Redemption, By Year, Caption [Text] rr_ExpenseExampleNoRedemptionByYearCaption With respect to Classes C and J shares, you would pay the following expenses if you did not redeem your shares (all other classes would be the same as in the above example):
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
Under normal circumstances, the Fund invests at least 80% of its net assets, plus any borrowings for investment purposes, in equity securities of companies principally engaged in the real estate industry at the time of purchase. A real estate company has at least 50% of its assets, income, or profits derived from products or services related to the real estate industry. Real estate companies include real estate investment trusts (“REITs”) and companies with substantial real estate holdings such as paper, lumber, hotel, and entertainment companies, as well as those whose products and services relate to the real estate industry, including building supply manufacturers, mortgage lenders, and mortgage servicing companies.
REITs are pooled investment vehicles that invest in income-producing real estate, real estate-related loans, or other types of real estate interests. REITs are corporations or business trusts that are permitted to eliminate corporate level federal income taxes by meeting certain requirements of the Internal Revenue Code.
The Fund invests in equity securities regardless of market capitalization (small, medium, or large). The Fund invests in growth and value equity securities. The Fund concentrates its investments (invest more than 25% of its net assets) in securities in the real estate industry.
The Fund is considered non-diversified, which means it can invest a higher percentage of assets in securities of individual issuers than a diversified fund. As a result, changes in the value of a single investment could cause greater fluctuations in the Fund’s share price than would occur in a more diversified fund.
Risk [Heading] rr_RiskHeading Principal Risks
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
The following information provides some indication of the risks of investing in the Fund. Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. You may get updated performance information at www.PrincipalAM.com.
The bar chart shows the investment returns of the Fund’s Class A shares for each full calendar year of operations for 10 years (or, if shorter, the life of the Fund). These annual returns do not reflect sales charges on Class A shares; if they did, results would be lower. The table shows for the last one, five, and ten calendar year periods (or, if shorter, the life of the Fund), how the Fund’s average annual total returns compare with those of one or more broad measures of market performance.
For periods prior to the inception date of Class R-6 shares (November 22, 2016), the performance shown in the table for Class R-6 shares is that of the Fund’s Class R-3 shares, adjusted to reflect the fees and expenses of Class R-6 shares. However, where the adjustment for fees and expenses results in performance for Class R-6 shares that is higher than the historical performance of the Class R-3 shares, the historical performance of the Class R-3 shares is used. These adjustments result in performance for such periods that is no higher than the historical performance of the Class R-3 shares.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following information provides some indication of the risks of investing in the Fund.
Performance Additional Market Index [Text] rr_PerformanceAdditionalMarketIndex The FTSE NAREIT All Equity REIT Index is included as an additional index for the Fund as it shows how the Fund’s performance compares with returns of an index of funds with similar investment objectives. Prior to March 1, 2024, the Fund’s index was the MSCI US REIT Index.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.PrincipalAM.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.
Bar Chart [Heading] rr_BarChartHeading Total Returns as of December 31
Bar Chart Does Not Reflect Sales Loads [Text] rr_BarChartDoesNotReflectSalesLoads These annual returns do not reflect sales charges on Class A shares; if they did, results would be lower.
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
Highest return for a quarter during the period of the bar chart above:Q1 201917.29 %
Lowest return for a quarter during the period of the bar chart above:Q1 2020(22.76)%
Performance Table Heading rr_PerformanceTableHeading Average Annual Total ReturnsFor the periods ended December 31, 2023
Performance Table Market Index Changed rr_PerformanceTableMarketIndexChanged Effective March 1, 2024, the Fund changed its primary broad-based index to the Russell 3000 Index in order to meet the revised definition of “broad-based securities market index.”
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are shown for Class A shares only and would be different for the other share classes.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock
After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. After-tax returns are shown for Class A shares only and would be different for the other share classes.
Effective March 1, 2024, the Fund changed its primary broad-based index to the Russell 3000 Index in order to meet the revised definition of “broad-based securities market index.” The FTSE NAREIT All Equity REIT Index is included as an additional index for the Fund as it shows how the Fund’s performance compares with returns of an index of funds with similar investment objectives. Prior to March 1, 2024, the Fund’s index was the MSCI US REIT Index.
PFI Prospectus | Real Estate Securities Fund | Risk Lose Money [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Many factors affect that value, and it is possible to lose money by investing in the Fund.
PFI Prospectus | Real Estate Securities Fund | Risk Not Insured Depository Institution [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
PFI Prospectus | Real Estate Securities Fund | Risk Nondiversified Status [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Non-Diversification Risk. A non-diversified fund may invest a high percentage of its assets in the securities of a small number of issuers and is more likely than diversified funds to be significantly affected by a specific security’s poor performance.
PFI Prospectus | Real Estate Securities Fund | Equity Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Equity Securities Risk. A variety of factors can negatively impact the value of equity securities held by a fund, including a decline in the issuer’s financial condition, unfavorable performance of the issuer’s sector or industry, or changes in response to overall market and economic conditions. A fund’s principal market segment(s) (such as market capitalization or style) may underperform other market segments or the equity markets as a whole.
•Growth Style Risk. Growth investing entails the risk that if growth companies do not increase their earnings at a rate expected by investors, the market price of their stock may decline significantly, even if earnings show an absolute increase. Growth company stocks also typically lack the dividend yield that can lessen price declines in market downturns.
•Smaller Companies Risk. Investments in smaller companies may involve greater risk and price volatility than investments in larger, more mature companies. Smaller companies may have limited product lines, markets, or financial resources; lack the competitive strength of larger companies; have less experienced managers; or depend on a few key employees. Their securities often are less widely held and trade less frequently and in lesser quantities, and their market prices often fluctuate more, than securities of larger companies.
•Value Style Risk. Value investing entails the risk that value stocks may continue to be undervalued by the market for extended periods, including the entire period during which the stock is held by a fund, or the events that would cause the stock price to increase may not occur as anticipated or at all. Moreover, a stock that appears to be undervalued actually may be appropriately priced at a low level and, therefore, would not be profitable for the fund.
PFI Prospectus | Real Estate Securities Fund | Equity Securities Risk, Growth Style Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Growth Style Risk. Growth investing entails the risk that if growth companies do not increase their earnings at a rate expected by investors, the market price of their stock may decline significantly, even if earnings show an absolute increase. Growth company stocks also typically lack the dividend yield that can lessen price declines in market downturns.
PFI Prospectus | Real Estate Securities Fund | Equity Securities Risk, Smaller Companies Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Smaller Companies Risk. Investments in smaller companies may involve greater risk and price volatility than investments in larger, more mature companies. Smaller companies may have limited product lines, markets, or financial resources; lack the competitive strength of larger companies; have less experienced managers; or depend on a few key employees. Their securities often are less widely held and trade less frequently and in lesser quantities, and their market prices often fluctuate more, than securities of larger companies.
PFI Prospectus | Real Estate Securities Fund | Equity Securities Risk, Value Style Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Value Style Risk. Value investing entails the risk that value stocks may continue to be undervalued by the market for extended periods, including the entire period during which the stock is held by a fund, or the events that would cause the stock price to increase may not occur as anticipated or at all. Moreover, a stock that appears to be undervalued actually may be appropriately priced at a low level and, therefore, would not be profitable for the fund.
PFI Prospectus | Real Estate Securities Fund | Industry Concentration Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Industry Concentration Risk. A fund that concentrates investments in a particular industry or group of industries has greater exposure than other funds to market, economic, and other factors affecting that industry or group of industries.
•Real Estate. A fund concentrating in the real estate industry is subject to the risks associated with direct ownership of real estate, securities of companies in the real estate industry, and/or real estate investment trusts. These risks are explained more fully below in Real Estate Investment Trusts (REITs) Risk and Real Estate Securities Risk.
PFI Prospectus | Real Estate Securities Fund | Industry Concentration Risk, Real Estate Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Real Estate. A fund concentrating in the real estate industry is subject to the risks associated with direct ownership of real estate, securities of companies in the real estate industry, and/or real estate investment trusts. These risks are explained more fully below in Real Estate Investment Trusts (REITs) Risk and Real Estate Securities Risk.
PFI Prospectus | Real Estate Securities Fund | Real Estate Investment Trusts ("REITs") Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Real Estate Investment Trusts (“REITs”) Risk. In addition to risks associated with investing in real estate securities, REITs are dependent upon management skills, are not diversified, and are subject to heavy cash flow dependency, risks of default by borrowers, and self-liquidation. Investment in REITs also involves risks similar to risks of investing in small market capitalization companies, such as limited financial resources, less frequent and limited volume trading, and may be subject to more abrupt or erratic price movements than larger company securities. A REIT could fail to qualify for tax-free pass-through of income under the Internal Revenue Code. Fund shareholders will indirectly bear their proportionate share of the expenses of REITs in which the fund invests.
PFI Prospectus | Real Estate Securities Fund | Real Estate Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Real Estate Securities Risk. Investing in real estate securities subjects the fund to the risks associated with the real estate market (which are similar to the risks associated with direct ownership in real estate), including declines in real estate values, loss due to casualty or condemnation, property taxes, interest rate changes, increased expenses, cash flow of underlying real estate assets, regulatory changes (including zoning, land use, and rents), and environmental problems, as well as to the risks related to the management skill and creditworthiness of the issuer.
PFI Prospectus | Real Estate Securities Fund | Redemption And Large Transaction Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Redemption and Large Transaction Risk. Ownership of the Fund’s shares may be concentrated in one or a few large investors (such as funds of funds, institutional investors, and asset allocation programs) that may redeem or purchase shares in large quantities. These transactions may cause the Fund to sell securities to meet redemptions or to invest additional cash at times it would not otherwise do so, which may result in increased transaction costs, increased expenses, changes to expense ratios, and adverse effects to Fund performance. Such transactions may also accelerate the realization of taxable income if sales of portfolio securities result in gains. Moreover, reallocations by large shareholders among share classes of a fund may result in changes to the expense ratios of affected classes, which may increase the expenses paid by shareholders of the class that experienced the redemption.
PFI Prospectus | Real Estate Securities Fund | Russell 3000 Index (reflects no deduction for fees, expenses, or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
Label rr_AverageAnnualReturnLabel Russell 3000 Index (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 25.96%
5 Years rr_AverageAnnualReturnYear05 15.16%
10 Years rr_AverageAnnualReturnYear10 11.48%
PFI Prospectus | Real Estate Securities Fund | FTSE NAREIT All Equity REIT Index (reflects no deduction for fees, expenses, or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
Label rr_AverageAnnualReturnLabel FTSE NAREIT All Equity REIT Index (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 11.36%
5 Years rr_AverageAnnualReturnYear05 7.59%
10 Years rr_AverageAnnualReturnYear10 7.95%
PFI Prospectus | Real Estate Securities Fund | MSCI US REIT Index (reflects no deduction for fees, expenses, or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
Label rr_AverageAnnualReturnLabel MSCI US REIT Index (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 13.74%
5 Years rr_AverageAnnualReturnYear05 7.40%
10 Years rr_AverageAnnualReturnYear10 7.60%
PFI Prospectus | Real Estate Securities Fund | Class A  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PRRAX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 5.50%
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.80%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.17%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.22%
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.22%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 667
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 916
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,183
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,946
Annual Return 2014 rr_AnnualReturn2014 31.81%
Annual Return 2015 rr_AnnualReturn2015 3.80%
Annual Return 2016 rr_AnnualReturn2016 5.51%
Annual Return 2017 rr_AnnualReturn2017 8.64%
Annual Return 2018 rr_AnnualReturn2018 (4.63%)
Annual Return 2019 rr_AnnualReturn2019 30.61%
Annual Return 2020 rr_AnnualReturn2020 (3.52%)
Annual Return 2021 rr_AnnualReturn2021 39.16%
Annual Return 2022 rr_AnnualReturn2022 (25.44%)
Annual Return 2023 rr_AnnualReturn2023 12.91%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Highest return for a quarter during the period of the bar chart above:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Mar. 31, 2019
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 17.29%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Lowest return for a quarter during the period of the bar chart above:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (22.76%)
Label rr_AverageAnnualReturnLabel Class A Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 6.69%
5 Years rr_AverageAnnualReturnYear05 6.89%
10 Years rr_AverageAnnualReturnYear10 7.63%
PFI Prospectus | Real Estate Securities Fund | Class A | After Taxes on Distributions  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Class A Return After Taxes on Distributions
1 Year rr_AverageAnnualReturnYear01 5.95%
5 Years rr_AverageAnnualReturnYear05 5.99%
10 Years rr_AverageAnnualReturnYear10 6.57%
PFI Prospectus | Real Estate Securities Fund | Class A | After Taxes on Distributions and Sales  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Class A Return After Taxes on Distributions and Sale of Fund Shares
1 Year rr_AverageAnnualReturnYear01 4.09%
5 Years rr_AverageAnnualReturnYear05 5.19%
10 Years rr_AverageAnnualReturnYear10 5.83%
PFI Prospectus | Real Estate Securities Fund | Class C  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PRCEX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.80%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.30%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 2.10%
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 2.10%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 313
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 658
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,129
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 2,206
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 213
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 658
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,129
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 2,206
Label rr_AverageAnnualReturnLabel Class C Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 10.89%
5 Years rr_AverageAnnualReturnYear05 7.24%
10 Years rr_AverageAnnualReturnYear10 7.56%
PFI Prospectus | Real Estate Securities Fund | Class J  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PREJX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.80%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.15%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.20%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.15%
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.15%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 217
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 365
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 633
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,398
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 117
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 365
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 633
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,398
Label rr_AverageAnnualReturnLabel Class J Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 11.98%
5 Years rr_AverageAnnualReturnYear05 8.24%
10 Years rr_AverageAnnualReturnYear10 8.37%
PFI Prospectus | Real Estate Securities Fund | Institutional Class  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PIREX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.80%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.12%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.92%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.06%) [55]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.86%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 88
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 287
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 503
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,126
Label rr_AverageAnnualReturnLabel Institutional Class Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 13.33%
5 Years rr_AverageAnnualReturnYear05 8.48%
10 Years rr_AverageAnnualReturnYear10 8.64%
PFI Prospectus | Real Estate Securities Fund | Class R-1  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PRAEX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.80%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.35%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.53%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.68%
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.68%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 171
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 530
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 913
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,987
Label rr_AverageAnnualReturnLabel Class R-1 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 12.39%
5 Years rr_AverageAnnualReturnYear05 7.62%
10 Years rr_AverageAnnualReturnYear10 7.77%
PFI Prospectus | Real Estate Securities Fund | Class R-3  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PRERX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.80%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.32%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.37%
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.37%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 139
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 434
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 750
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,646
Label rr_AverageAnnualReturnLabel Class R-3 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 12.74%
5 Years rr_AverageAnnualReturnYear05 7.94%
10 Years rr_AverageAnnualReturnYear10 8.11%
PFI Prospectus | Real Estate Securities Fund | Class R-4  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PRETX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.80%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.10%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.28%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.18%
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.18%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 120
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 375
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 649
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,432
Label rr_AverageAnnualReturnLabel Class R-4 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 12.95%
5 Years rr_AverageAnnualReturnYear05 8.15%
10 Years rr_AverageAnnualReturnYear10 8.31%
PFI Prospectus | Real Estate Securities Fund | Class R-5  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PREPX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.80%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.26%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.06%
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.06%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 108
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 337
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 585
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,294
Label rr_AverageAnnualReturnLabel Class R-5 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 13.08%
5 Years rr_AverageAnnualReturnYear05 8.29%
10 Years rr_AverageAnnualReturnYear10 8.44%
PFI Prospectus | Real Estate Securities Fund | Class R-6  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PFRSX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.80%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.01%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.81%
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.81%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 83
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 259
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 450
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,002
Label rr_AverageAnnualReturnLabel Class R-6 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 13.39%
5 Years rr_AverageAnnualReturnYear05 8.56%
10 Years rr_AverageAnnualReturnYear10 8.54%
PFI Prospectus | Strategic Asset Management Balanced Portfolio  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading SAM (STRATEGIC ASSET MANAGEMENT) BALANCED PORTFOLIO
Objective [Heading] rr_ObjectiveHeading Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The Fund seeks to provide as high a level of total return (consisting of reinvested income and capital appreciation) as is consistent with reasonable risk.
Expense [Heading] rr_ExpenseHeading Fees and Expenses of the Fund
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock
This table describes the fees and expenses that you may pay if you buy, hold, and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in Class A Shares of Principal Funds, Inc. More information about these and other discounts is available from your financial intermediary and in “Choosing a Share Class and The Costs of Investing” beginning on page 426 of the Fund’s Prospectus, Appendix B to the Prospectus titled “Intermediary-Specific Sales Charge Waivers and Reductions,” and “Multiple Class Structure” beginning on page 70 of the Fund’s Statement of Additional Information.
If you purchase Institutional Class shares through certain programs offered by certain financial intermediaries, you may be required to pay a commission and/or other forms of compensation to the broker, or to your Financial Professional or other financial intermediary.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder Fees (fees paid directly from your investment)
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock The Fund and each underlying fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs. These costs, which are not reflected in Annual Fund Operating Expenses or in the Example, affect the Fund’s and the underlying funds' performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 26.1% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 26.10%
Expense Breakpoint Discounts [Text] rr_ExpenseBreakpointDiscounts You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in Class A Shares of Principal Funds, Inc.
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 50,000
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example assumes conversion of the Class C shares to Class A shares after the eighth year. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, No Redemption, By Year, Caption [Text] rr_ExpenseExampleNoRedemptionByYearCaption With respect to Classes C and J shares, you would pay the following expenses if you did not redeem your shares (all other classes would be the same as in the above example):
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
The SAM Portfolios operate as funds of funds and invest principally in funds and exchange-traded funds (“ETFs”) of Principal Funds, Inc. and Principal Exchange-Traded Funds (“Underlying Funds”). Each SAM Portfolio generally categorizes each Underlying Fund as a fixed-income, equity, or specialty fund based on its investment profile. Each SAM Portfolio typically allocates its assets among Underlying Funds, and within predetermined percentage ranges, as determined by the SAM Portfolio in accordance with its outlook for the economy, the financial markets, and the relative market valuations of the Underlying Funds. The asset class diversification of the SAM Portfolio is designed to moderate overall price volatility and cushion severe losses in any one investment sector.
The Fund generally invests:
•    between 20% and 60% of its assets in fixed-income funds, and less than 40% in any one fixed-income fund; such funds generally invest in fixed-income instruments such as securitized products and corporate bonds;
•    between 40% and 80% of its assets in equity funds, and less than 30% in any one equity fund; such funds generally invest in equity securities of domestic and foreign companies (including in emerging markets), including small, medium, and large market capitalization companies, and growth and value stock; and
•    less than 20% of its assets in specialty funds, and less than 20% in any one specialty fund; such funds generally offer unique combinations of traditional equity securities and fixed-income securities or use alternative investment strategies that aim to offer diversification beyond traditional equity and fixed-income securities and include investments in such assets as infrastructure, commodities, currencies, and natural resources companies.
The Fund may temporarily exceed these percentage ranges and may alter the percentage ranges when it deems appropriate.
Risk [Heading] rr_RiskHeading Principal Risks
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
The following information provides some indication of the risks of investing in the Fund. Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. You may get updated performance information at www.PrincipalAM.com.
The bar chart shows the investment returns of the Fund’s Class A shares for each full calendar year of operations for 10 years (or, if shorter, the life of the Fund). These annual returns do not reflect sales charges on Class A shares; if they did, results would be lower. The table shows for the last one, five, and ten calendar year periods (or, if shorter, the life of the Fund), how the Fund’s average annual total returns compare with those of one or more broad measures of market performance.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following information provides some indication of the risks of investing in the Fund.
Performance Additional Market Index [Text] rr_PerformanceAdditionalMarketIndex The SAM Balanced Blended Index is included as an additional index for the Fund as it shows how the Fund’s performance compares with returns of indices of funds with similar investment objectives. Performance of each component of the blended index is also shown. The weightings for SAM Balanced Blended Index are as follows: 45% Russell 3000 Index, 40% Bloomberg U.S. Aggregate Bond Index, and 15% MSCI EAFE Index NTR.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.PrincipalAM.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.
Bar Chart [Heading] rr_BarChartHeading Total Returns as of December 31
Bar Chart Does Not Reflect Sales Loads [Text] rr_BarChartDoesNotReflectSalesLoads These annual returns do not reflect sales charges on Class A shares; if they did, results would be lower.
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
Highest return for a quarter during the period of the bar chart above:Q2 202013.09 %
Lowest return for a quarter during the period of the bar chart above:Q1 2020(15.43)%
Performance Table Heading rr_PerformanceTableHeading Average Annual Total ReturnsFor the periods ended December 31, 2023
Performance Table Market Index Changed rr_PerformanceTableMarketIndexChanged Effective March 1, 2024, the Fund changed its primary broad-based index to the Russell 3000 Index in order to meet the revised definition of “broad-based securities market index.”
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are shown for Class A shares only and would be different for the other share classes.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock
After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. After-tax returns are shown for Class A shares only and would be different for the other share classes.
Effective March 1, 2024, the Fund changed its primary broad-based index to the Russell 3000 Index in order to meet the revised definition of “broad-based securities market index.” The SAM Balanced Blended Index is included as an additional index for the Fund as it shows how the Fund’s performance compares with returns of indices of funds with similar investment objectives. Performance of each component of the blended index is also shown. The weightings for SAM Balanced Blended Index are as follows: 45% Russell 3000 Index, 40% Bloomberg U.S. Aggregate Bond Index, and 15% MSCI EAFE Index NTR.
PFI Prospectus | Strategic Asset Management Balanced Portfolio | Risk Lose Money [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Many factors affect that value, and it is possible to lose money by investing in the Fund.
PFI Prospectus | Strategic Asset Management Balanced Portfolio | Risk Not Insured Depository Institution [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
PFI Prospectus | Strategic Asset Management Balanced Portfolio | Emerging Markets Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Emerging Markets Risk. Investments in emerging markets may have more risk than those in developed markets because the emerging markets are less developed and more illiquid. Emerging markets can also be subject to increased social, economic, regulatory, and political uncertainties and can be extremely volatile. The U.S. Securities and Exchange Commission, the U.S. Department of Justice, and other U.S. authorities may be limited in their ability to pursue bad actors in emerging markets, including with respect to fraud.
PFI Prospectus | Strategic Asset Management Balanced Portfolio | Equity Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Equity Securities Risk. A variety of factors can negatively impact the value of equity securities held by a fund, including a decline in the issuer’s financial condition, unfavorable performance of the issuer’s sector or industry, or changes in response to overall market and economic conditions. A fund’s principal market segment(s) (such as market capitalization or style) may underperform other market segments or the equity markets as a whole.
•Growth Style Risk. Growth investing entails the risk that if growth companies do not increase their earnings at a rate expected by investors, the market price of their stock may decline significantly, even if earnings show an absolute increase. Growth company stocks also typically lack the dividend yield that can lessen price declines in market downturns.
•Smaller Companies Risk. Investments in smaller companies may involve greater risk and price volatility than investments in larger, more mature companies. Smaller companies may have limited product lines, markets, or financial resources; lack the competitive strength of larger companies; have less experienced managers; or depend on a few key employees. Their securities often are less widely held and trade less frequently and in lesser quantities, and their market prices often fluctuate more, than securities of larger companies.
•Value Style Risk. Value investing entails the risk that value stocks may continue to be undervalued by the market for extended periods, including the entire period during which the stock is held by a fund, or the events that would cause the stock price to increase may not occur as anticipated or at all. Moreover, a stock that appears to be undervalued actually may be appropriately priced at a low level and, therefore, would not be profitable for the fund.
PFI Prospectus | Strategic Asset Management Balanced Portfolio | Equity Securities Risk, Growth Style Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Growth Style Risk. Growth investing entails the risk that if growth companies do not increase their earnings at a rate expected by investors, the market price of their stock may decline significantly, even if earnings show an absolute increase. Growth company stocks also typically lack the dividend yield that can lessen price declines in market downturns.
PFI Prospectus | Strategic Asset Management Balanced Portfolio | Equity Securities Risk, Smaller Companies Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Smaller Companies Risk. Investments in smaller companies may involve greater risk and price volatility than investments in larger, more mature companies. Smaller companies may have limited product lines, markets, or financial resources; lack the competitive strength of larger companies; have less experienced managers; or depend on a few key employees. Their securities often are less widely held and trade less frequently and in lesser quantities, and their market prices often fluctuate more, than securities of larger companies.
PFI Prospectus | Strategic Asset Management Balanced Portfolio | Equity Securities Risk, Value Style Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Value Style Risk. Value investing entails the risk that value stocks may continue to be undervalued by the market for extended periods, including the entire period during which the stock is held by a fund, or the events that would cause the stock price to increase may not occur as anticipated or at all. Moreover, a stock that appears to be undervalued actually may be appropriately priced at a low level and, therefore, would not be profitable for the fund.
PFI Prospectus | Strategic Asset Management Balanced Portfolio | Fixed-Income Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Fixed-Income Securities Risk. Fixed-income securities are subject to interest rate, credit quality, and liquidity risks. The market value of fixed-income securities generally declines when interest rates rise, and increased interest rates may adversely affect the liquidity of certain fixed-income securities. Moreover, an issuer of fixed-income securities could default on its payment obligations due to increased interest rates or for other reasons.
PFI Prospectus | Strategic Asset Management Balanced Portfolio | Foreign Currency Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Foreign Currency Risk. Risks of investing in securities denominated in, or that trade in, foreign (non-U.S.) currencies include changes in foreign exchange rates and foreign exchange restrictions.
PFI Prospectus | Strategic Asset Management Balanced Portfolio | Foreign Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Foreign Securities Risk. The risks of foreign securities include loss of value as a result of: political or economic instability; nationalization, expropriation, or confiscatory taxation; settlement delays; and limited government regulation (including less stringent reporting, accounting, and disclosure standards than are required of U.S. companies).
PFI Prospectus | Strategic Asset Management Balanced Portfolio | Fund Of Funds Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Fund of Funds Risk. Fund shareholders bear indirectly their proportionate share of the expenses of other investment companies (for example, other mutual funds or exchange-traded funds) in which the Fund invests (“underlying funds”). The Fund’s selection and weighting of asset classes and allocation of investments in underlying funds may cause it to underperform other funds with a similar investment objective. The Fund’s performance and risks correspond directly to the performance and risks of the underlying funds in which it invests, proportionately in accordance with the weightings of such investments, and there is no assurance that the underlying funds will achieve their investment objectives. Management of the Fund entails potential conflicts of interest: the Fund invests in affiliated underlying funds; and PGI and its affiliates may earn different fees from different underlying funds and may have an incentive to allocate more Fund assets to underlying funds from which they receive higher fees.
PFI Prospectus | Strategic Asset Management Balanced Portfolio | Portfolio Duration Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Portfolio Duration Risk. Portfolio duration is a measure of the expected life of a fixed-income security and its sensitivity to changes in interest rates. The longer a fund’s average portfolio duration, the more sensitive the fund will be to changes in interest rates, which means funds with longer average portfolio durations may be more volatile than those with shorter durations.
PFI Prospectus | Strategic Asset Management Balanced Portfolio | Redemption And Large Transaction Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Redemption and Large Transaction Risk. Ownership of the Fund’s shares may be concentrated in one or a few large investors (such as funds of funds, institutional investors, and asset allocation programs) that may redeem or purchase shares in large quantities. These transactions may cause the Fund to sell securities to meet redemptions or to invest additional cash at times it would not otherwise do so, which may result in increased transaction costs, increased expenses, changes to expense ratios, and adverse effects to Fund performance. Such transactions may also accelerate the realization of taxable income if sales of portfolio securities result in gains. Moreover, reallocations by large shareholders among share classes of a fund may result in changes to the expense ratios of affected classes, which may increase the expenses paid by shareholders of the class that experienced the redemption.
PFI Prospectus | Strategic Asset Management Balanced Portfolio | Securitized Products Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Securitized Products Risk. Investments in securitized products are subject to risks similar to traditional fixed-income securities, such as credit, interest rate, liquidity, prepayment, extension, and default risk, as well as additional risks associated with the nature of the assets and the servicing of those assets. Unscheduled prepayments on securitized products may have to be reinvested at lower rates. A reduction in prepayments may increase the effective maturities of these securities, exposing them to the risk of decline in market value over time (extension risk).
PFI Prospectus | Strategic Asset Management Balanced Portfolio | Bloomberg U.S. Aggregate Bond Index (reflects no deduction for fees, expenses, or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
Label rr_AverageAnnualReturnLabel Bloomberg U.S. Aggregate Bond Index (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 5.53%
5 Years rr_AverageAnnualReturnYear05 1.10%
10 Years rr_AverageAnnualReturnYear10 1.81%
PFI Prospectus | Strategic Asset Management Balanced Portfolio | Russell 3000 Index (reflects no deduction for fees, expenses, or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
Label rr_AverageAnnualReturnLabel Russell 3000 Index (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 25.96%
5 Years rr_AverageAnnualReturnYear05 15.16%
10 Years rr_AverageAnnualReturnYear10 11.48%
PFI Prospectus | Strategic Asset Management Balanced Portfolio | SAM Balanced Blended Index (except as noted for MSCI EAFE Index NTR, reflects no deduction for fees, expenses, or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (except as noted for MSCI EAFE Index NTR, reflects no deduction for fees, expenses, or taxes)
Label rr_AverageAnnualReturnLabel SAM Balanced Blended Index (except as noted for MSCI EAFE Index NTR, reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 16.41%
5 Years rr_AverageAnnualReturnYear05 8.69%
10 Years rr_AverageAnnualReturnYear10 6.73%
PFI Prospectus | Strategic Asset Management Balanced Portfolio | MSCI EAFE Index NTR (reflects withholding taxes on foreign dividends, but no deduction for fees, expenses, or other taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects withholding taxes on foreign dividends, but no deduction for fees, expenses, or other taxes)
Label rr_AverageAnnualReturnLabel MSCI EAFE Index NTR (reflects withholding taxes on foreign dividends, but no deduction for fees, expenses, or other taxes)
1 Year rr_AverageAnnualReturnYear01 18.24%
5 Years rr_AverageAnnualReturnYear05 8.16%
10 Years rr_AverageAnnualReturnYear10 4.28%
PFI Prospectus | Strategic Asset Management Balanced Portfolio | Class A  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol SABPX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 5.50%
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.28%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.09%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.50%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.12%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 658
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 886
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,133
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,838
Annual Return 2014 rr_AnnualReturn2014 6.36%
Annual Return 2015 rr_AnnualReturn2015 (1.25%)
Annual Return 2016 rr_AnnualReturn2016 6.31%
Annual Return 2017 rr_AnnualReturn2017 14.65%
Annual Return 2018 rr_AnnualReturn2018 (5.39%)
Annual Return 2019 rr_AnnualReturn2019 19.57%
Annual Return 2020 rr_AnnualReturn2020 10.83%
Annual Return 2021 rr_AnnualReturn2021 13.22%
Annual Return 2022 rr_AnnualReturn2022 (16.47%)
Annual Return 2023 rr_AnnualReturn2023 15.64%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Highest return for a quarter during the period of the bar chart above:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 13.09%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Lowest return for a quarter during the period of the bar chart above:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (15.43%)
Label rr_AverageAnnualReturnLabel Class A Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 9.24%
5 Years rr_AverageAnnualReturnYear05 6.49%
10 Years rr_AverageAnnualReturnYear10 5.19%
PFI Prospectus | Strategic Asset Management Balanced Portfolio | Class A | After Taxes on Distributions  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Class A Return After Taxes on Distributions
1 Year rr_AverageAnnualReturnYear01 8.67%
5 Years rr_AverageAnnualReturnYear05 5.07%
10 Years rr_AverageAnnualReturnYear10 3.63%
PFI Prospectus | Strategic Asset Management Balanced Portfolio | Class A | After Taxes on Distributions and Sales  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Class A Return After Taxes on Distributions and Sale of Fund Shares
1 Year rr_AverageAnnualReturnYear01 5.63%
5 Years rr_AverageAnnualReturnYear05 4.88%
10 Years rr_AverageAnnualReturnYear10 3.75%
PFI Prospectus | Strategic Asset Management Balanced Portfolio | Class C  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol SCBPX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.28%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.12%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.50%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.90%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 293
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 597
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,026
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 2,019
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 193
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 597
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,026
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 2,019
Label rr_AverageAnnualReturnLabel Class C Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 13.66%
5 Years rr_AverageAnnualReturnYear05 6.88%
10 Years rr_AverageAnnualReturnYear10 5.14%
PFI Prospectus | Strategic Asset Management Balanced Portfolio | Class J  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PSAJX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.28%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.15%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.03%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.50%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.96%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 198
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 306
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 531
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,178
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 98
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 306
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 531
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,178
Label rr_AverageAnnualReturnLabel Class J Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 14.77%
5 Years rr_AverageAnnualReturnYear05 7.88%
10 Years rr_AverageAnnualReturnYear10 5.93%
PFI Prospectus | Strategic Asset Management Balanced Portfolio | Institutional Class  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PSBIX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.28%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.02%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.50%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.80%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 82
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 255
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 444
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 990
Label rr_AverageAnnualReturnLabel Institutional Class Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 15.91%
5 Years rr_AverageAnnualReturnYear05 8.03%
10 Years rr_AverageAnnualReturnYear10 6.12%
PFI Prospectus | Strategic Asset Management Balanced Portfolio | Class R-1  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PSBGX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.28%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.35%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.53%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.50%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.66%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 169
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 523
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 902
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,965
Label rr_AverageAnnualReturnLabel Class R-1 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 14.96%
5 Years rr_AverageAnnualReturnYear05 7.14%
10 Years rr_AverageAnnualReturnYear10 5.22%
PFI Prospectus | Strategic Asset Management Balanced Portfolio | Class R-3  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PBAPX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.28%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.32%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.50%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.35%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 137
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 428
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 739
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,624
Label rr_AverageAnnualReturnLabel Class R-3 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 15.27%
5 Years rr_AverageAnnualReturnYear05 7.44%
10 Years rr_AverageAnnualReturnYear10 5.53%
PFI Prospectus | Strategic Asset Management Balanced Portfolio | Class R-4  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PSBLX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.28%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.10%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.28%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.50%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.16%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 118
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 368
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 638
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,409
Label rr_AverageAnnualReturnLabel Class R-4 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 15.50%
5 Years rr_AverageAnnualReturnYear05 7.65%
10 Years rr_AverageAnnualReturnYear10 5.73%
PFI Prospectus | Strategic Asset Management Balanced Portfolio | Class R-5  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PSBFX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.28%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.26%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.50%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.04%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 106
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 331
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 574
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,271
Label rr_AverageAnnualReturnLabel Class R-5 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 15.65%
5 Years rr_AverageAnnualReturnYear05 7.78%
10 Years rr_AverageAnnualReturnYear10 5.86%
PFI Prospectus | Strategic Asset Management Conservative Balanced Portfolio  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading SAM (STRATEGIC ASSET MANAGEMENT) CONSERVATIVE BALANCED PORTFOLIO
Objective [Heading] rr_ObjectiveHeading Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The Fund seeks to provide a high level of total return (consisting of reinvestment of income and capital appreciation), consistent with a moderate degree of principal risk.
Expense [Heading] rr_ExpenseHeading Fees and Expenses of the Fund
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock
This table describes the fees and expenses that you may pay if you buy, hold, and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in Class A Shares of Principal Funds, Inc. More information about these and other discounts is available from your financial intermediary and in “Choosing a Share Class and The Costs of Investing” beginning on page 426 of the Fund’s Prospectus, Appendix B to the Prospectus titled “Intermediary-Specific Sales Charge Waivers and Reductions,” and “Multiple Class Structure” beginning on page 70 of the Fund’s Statement of Additional Information.
If you purchase Institutional Class shares through certain programs offered by certain financial intermediaries, you may be required to pay a commission and/or other forms of compensation to the broker, or to your Financial Professional or other financial intermediary.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder Fees (fees paid directly from your investment)
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock The Fund and each underlying fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs. These costs, which are not reflected in Annual Fund Operating Expenses or in the Example, affect the Fund’s and the underlying fund's performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 25.5% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 25.50%
Expense Breakpoint Discounts [Text] rr_ExpenseBreakpointDiscounts You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in Class A Shares of Principal Funds, Inc.
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 50,000
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example assumes conversion of the Class C shares to Class A shares after the eighth year. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same.
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, No Redemption, By Year, Caption [Text] rr_ExpenseExampleNoRedemptionByYearCaption With respect to Classes C and J shares, you would pay the following expenses if you did not redeem your shares (all other classes would be the same as in the above example):
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
The SAM Portfolios operate as funds of funds and invest principally in funds and exchange-traded funds (“ETFs”) of Principal Funds, Inc. and Principal Exchange-Traded Funds (“Underlying Funds”). Each SAM Portfolio generally categorizes each Underlying Fund as a fixed-income, equity, or specialty fund based on its investment profile. Each SAM Portfolio typically allocates its assets among Underlying Funds, and within predetermined percentage ranges, as determined by the SAM Portfolio in accordance with its outlook for the economy, the financial markets, and the relative market valuations of the Underlying Funds. The asset class diversification of the SAM Portfolio is designed to moderate overall price volatility and cushion severe losses in any one investment sector.
The Fund generally invests:
•    between 40% and 80% of its assets in fixed-income funds, and less than 40% in any one fixed-income fund; such funds generally invest in fixed-income instruments such as high yield securities (or “junk” bonds), securitized products, and corporate bonds;
•    between 20% and 60% of its assets in equity funds, and less than 30% in any one equity fund; such funds generally invest in equity securities of domestic and foreign companies (including in emerging markets), including small, medium, and large market capitalization companies, and growth and value stock; and
•    less than 20% of its assets in specialty funds, and less than 20% in any one specialty fund; such funds generally offer unique combinations of traditional equity securities and fixed-income securities or use alternative investment strategies that aim to offer diversification beyond traditional equity and fixed-income securities and include investments in such assets as infrastructure, commodities, currencies, and natural resources companies.
The Fund may temporarily exceed these percentage ranges and may alter the percentage ranges when it deems appropriate.
Strategy Portfolio Concentration [Text] rr_StrategyPortfolioConcentration The Fund generally invests:•    between 40% and 80% of its assets in fixed-income funds, and less than 40% in any one fixed-income fund; such funds generally invest in fixed-income instruments such as high yield securities (or “junk” bonds), securitized products, and corporate bonds;•    between 20% and 60% of its assets in equity funds, and less than 30% in any one equity fund; such funds generally invest in equity securities of domestic and foreign companies (including in emerging markets), including small, medium, and large market capitalization companies, and growth and value stock; and•    less than 20% of its assets in specialty funds, and less than 20% in any one specialty fund; such funds generally offer unique combinations of traditional equity securities and fixed-income securities or use alternative investment strategies that aim to offer diversification beyond traditional equity and fixed-income securities and include investments in such assets as infrastructure, commodities, currencies, and natural resources companies.
Risk [Heading] rr_RiskHeading Principal Risks
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
The following information provides some indication of the risks of investing in the Fund. Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. You may get updated performance information at www.PrincipalAM.com.
The bar chart shows the investment returns of the Fund’s Class A shares for each full calendar year of operations for 10 years (or, if shorter, the life of the Fund). These annual returns do not reflect sales charges on Class A shares; if they did, results would be lower. The table shows for the last one, five, and ten calendar year periods (or, if shorter, the life of the Fund), how the Fund’s average annual total returns compare with those of one or more broad measures of market performance.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following information provides some indication of the risks of investing in the Fund.
Performance Additional Market Index [Text] rr_PerformanceAdditionalMarketIndex The SAM Conservative Balanced Blended Index is included as an additional index for the Fund as it shows how the Fund’s performance compares with the returns of an index of funds with similar investment objectives. Performance of each component of the blended index is also shown. The weightings for SAM Conservative Balanced Blended Index are 60% Bloomberg U.S. Aggregate Bond Index, 30% Russell 3000 Index, and 10% MSCI EAFE Index NTR.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.PrincipalAM.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.
Bar Chart [Heading] rr_BarChartHeading Total Returns as of December 31
Bar Chart Does Not Reflect Sales Loads [Text] rr_BarChartDoesNotReflectSalesLoads These annual returns do not reflect sales charges on Class A shares; if they did, results would be lower.
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
Highest return for a quarter during the period of the bar chart above:Q2 202010.32 %
Lowest return for a quarter during the period of the bar chart above:Q1 2020(11.74)%
Performance Table Heading rr_PerformanceTableHeading Average Annual Total ReturnsFor the periods ended December 31, 2023
Performance Table Market Index Changed rr_PerformanceTableMarketIndexChanged Effective March 1, 2024, the Fund changed its primary broad-based index to the Bloomberg U.S. Aggregate Bond Index in order to meet the revised definition of “broad-based securities market index.”
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are shown for Class A shares only and would be different for the other share classes.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock
After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. After-tax returns are shown for Class A shares only and would be different for the other share classes.
Effective March 1, 2024, the Fund changed its primary broad-based index to the Bloomberg U.S. Aggregate Bond Index in order to meet the revised definition of “broad-based securities market index.” The SAM Conservative Balanced Blended Index is included as an additional index for the Fund as it shows how the Fund’s performance compares with the returns of an index of funds with similar investment objectives. Performance of each component of the blended index is also shown. The weightings for SAM Conservative Balanced Blended Index are 60% Bloomberg U.S. Aggregate Bond Index, 30% Russell 3000 Index, and 10% MSCI EAFE Index NTR.
PFI Prospectus | Strategic Asset Management Conservative Balanced Portfolio | Risk Lose Money [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Many factors affect that value, and it is possible to lose money by investing in the Fund.
PFI Prospectus | Strategic Asset Management Conservative Balanced Portfolio | Risk Not Insured Depository Institution [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
PFI Prospectus | Strategic Asset Management Conservative Balanced Portfolio | Emerging Markets Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Emerging Markets Risk. Investments in emerging markets may have more risk than those in developed markets because the emerging markets are less developed and more illiquid. Emerging markets can also be subject to increased social, economic, regulatory, and political uncertainties and can be extremely volatile. The U.S. Securities and Exchange Commission, the U.S. Department of Justice, and other U.S. authorities may be limited in their ability to pursue bad actors in emerging markets, including with respect to fraud.
PFI Prospectus | Strategic Asset Management Conservative Balanced Portfolio | Equity Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Equity Securities Risk. A variety of factors can negatively impact the value of equity securities held by a fund, including a decline in the issuer’s financial condition, unfavorable performance of the issuer’s sector or industry, or changes in response to overall market and economic conditions. A fund’s principal market segment(s) (such as market capitalization or style) may underperform other market segments or the equity markets as a whole.
•Growth Style Risk. Growth investing entails the risk that if growth companies do not increase their earnings at a rate expected by investors, the market price of their stock may decline significantly, even if earnings show an absolute increase. Growth company stocks also typically lack the dividend yield that can lessen price declines in market downturns.
•Smaller Companies Risk. Investments in smaller companies may involve greater risk and price volatility than investments in larger, more mature companies. Smaller companies may have limited product lines, markets, or financial resources; lack the competitive strength of larger companies; have less experienced managers; or depend on a few key employees. Their securities often are less widely held and trade less frequently and in lesser quantities, and their market prices often fluctuate more, than securities of larger companies.
•Value Style Risk. Value investing entails the risk that value stocks may continue to be undervalued by the market for extended periods, including the entire period during which the stock is held by a fund, or the events that would cause the stock price to increase may not occur as anticipated or at all. Moreover, a stock that appears to be undervalued actually may be appropriately priced at a low level and, therefore, would not be profitable for the fund.
PFI Prospectus | Strategic Asset Management Conservative Balanced Portfolio | Equity Securities Risk, Growth Style Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Growth Style Risk. Growth investing entails the risk that if growth companies do not increase their earnings at a rate expected by investors, the market price of their stock may decline significantly, even if earnings show an absolute increase. Growth company stocks also typically lack the dividend yield that can lessen price declines in market downturns.
PFI Prospectus | Strategic Asset Management Conservative Balanced Portfolio | Equity Securities Risk, Smaller Companies Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Smaller Companies Risk. Investments in smaller companies may involve greater risk and price volatility than investments in larger, more mature companies. Smaller companies may have limited product lines, markets, or financial resources; lack the competitive strength of larger companies; have less experienced managers; or depend on a few key employees. Their securities often are less widely held and trade less frequently and in lesser quantities, and their market prices often fluctuate more, than securities of larger companies.
PFI Prospectus | Strategic Asset Management Conservative Balanced Portfolio | Equity Securities Risk, Value Style Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Value Style Risk. Value investing entails the risk that value stocks may continue to be undervalued by the market for extended periods, including the entire period during which the stock is held by a fund, or the events that would cause the stock price to increase may not occur as anticipated or at all. Moreover, a stock that appears to be undervalued actually may be appropriately priced at a low level and, therefore, would not be profitable for the fund.
PFI Prospectus | Strategic Asset Management Conservative Balanced Portfolio | Fixed-Income Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Fixed-Income Securities Risk. Fixed-income securities are subject to interest rate, credit quality, and liquidity risks. The market value of fixed-income securities generally declines when interest rates rise, and increased interest rates may adversely affect the liquidity of certain fixed-income securities. Moreover, an issuer of fixed-income securities could default on its payment obligations due to increased interest rates or for other reasons.
PFI Prospectus | Strategic Asset Management Conservative Balanced Portfolio | Foreign Currency Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Foreign Currency Risk. Risks of investing in securities denominated in, or that trade in, foreign (non-U.S.) currencies include changes in foreign exchange rates and foreign exchange restrictions.
PFI Prospectus | Strategic Asset Management Conservative Balanced Portfolio | Foreign Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Foreign Securities Risk. The risks of foreign securities include loss of value as a result of: political or economic instability; nationalization, expropriation, or confiscatory taxation; settlement delays; and limited government regulation (including less stringent reporting, accounting, and disclosure standards than are required of U.S. companies).
PFI Prospectus | Strategic Asset Management Conservative Balanced Portfolio | Fund Of Funds Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Fund of Funds Risk. Fund shareholders bear indirectly their proportionate share of the expenses of other investment companies (for example, other mutual funds or exchange-traded funds) in which the Fund invests (“underlying funds”). The Fund’s selection and weighting of asset classes and allocation of investments in underlying funds may cause it to underperform other funds with a similar investment objective. The Fund’s performance and risks correspond directly to the performance and risks of the underlying funds in which it invests, proportionately in accordance with the weightings of such investments, and there is no assurance that the underlying funds will achieve their investment objectives. Management of the Fund entails potential conflicts of interest: the Fund invests in affiliated underlying funds; and PGI and its affiliates may earn different fees from different underlying funds and may have an incentive to allocate more Fund assets to underlying funds from which they receive higher fees.
PFI Prospectus | Strategic Asset Management Conservative Balanced Portfolio | High Yield Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
High Yield Securities Risk. High yield fixed-income securities (commonly referred to as “junk bonds”) are subject to greater credit quality risk than higher rated fixed-income securities and should be considered speculative.
PFI Prospectus | Strategic Asset Management Conservative Balanced Portfolio | Portfolio Duration Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Portfolio Duration Risk. Portfolio duration is a measure of the expected life of a fixed-income security and its sensitivity to changes in interest rates. The longer a fund’s average portfolio duration, the more sensitive the fund will be to changes in interest rates, which means funds with longer average portfolio durations may be more volatile than those with shorter durations.
PFI Prospectus | Strategic Asset Management Conservative Balanced Portfolio | Redemption And Large Transaction Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Redemption and Large Transaction Risk. Ownership of the Fund’s shares may be concentrated in one or a few large investors (such as funds of funds, institutional investors, and asset allocation programs) that may redeem or purchase shares in large quantities. These transactions may cause the Fund to sell securities to meet redemptions or to invest additional cash at times it would not otherwise do so, which may result in increased transaction costs, increased expenses, changes to expense ratios, and adverse effects to Fund performance. Such transactions may also accelerate the realization of taxable income if sales of portfolio securities result in gains. Moreover, reallocations by large shareholders among share classes of a fund may result in changes to the expense ratios of affected classes, which may increase the expenses paid by shareholders of the class that experienced the redemption.
PFI Prospectus | Strategic Asset Management Conservative Balanced Portfolio | Securitized Products Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Securitized Products Risk. Investments in securitized products are subject to risks similar to traditional fixed-income securities, such as credit, interest rate, liquidity, prepayment, extension, and default risk, as well as additional risks associated with the nature of the assets and the servicing of those assets. Unscheduled prepayments on securitized products may have to be reinvested at lower rates. A reduction in prepayments may increase the effective maturities of these securities, exposing them to the risk of decline in market value over time (extension risk).
PFI Prospectus | Strategic Asset Management Conservative Balanced Portfolio | Bloomberg U.S. Aggregate Bond Index (reflects no deduction for fees, expenses, or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
Label rr_AverageAnnualReturnLabel Bloomberg U.S. Aggregate Bond Index (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 5.53%
5 Years rr_AverageAnnualReturnYear05 1.10%
10 Years rr_AverageAnnualReturnYear10 1.81%
PFI Prospectus | Strategic Asset Management Conservative Balanced Portfolio | Russell 3000 Index (reflects no deduction for fees, expenses, or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
Label rr_AverageAnnualReturnLabel Russell 3000 Index (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 25.96%
5 Years rr_AverageAnnualReturnYear05 15.16%
10 Years rr_AverageAnnualReturnYear10 11.48%
PFI Prospectus | Strategic Asset Management Conservative Balanced Portfolio | SAM Conservative Growth Blended Index (except as noted for MSCI EAFE Index NTR, reflects no deduction for fees, expenses, or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (except as noted for MSCI EAFE Index NTR, reflects no deduction for fees, expenses, or taxes)
Label rr_AverageAnnualReturnLabel SAM Conservative Balanced Blended Index (except as noted for MSCI EAFE Index NTR, reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 12.71%
5 Years rr_AverageAnnualReturnYear05 6.22%
10 Years rr_AverageAnnualReturnYear10 5.15%
PFI Prospectus | Strategic Asset Management Conservative Balanced Portfolio | MSCI EAFE Index NTR (reflects withholding taxes on foreign dividends, but no deduction for fees, expenses, or other taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects withholding taxes on foreign dividends, but no deduction for fees, expenses, or other taxes)
Label rr_AverageAnnualReturnLabel MSCI EAFE Index NTR (reflects withholding taxes on foreign dividends, but no deduction for fees, expenses, or other taxes)
1 Year rr_AverageAnnualReturnYear01 18.24%
5 Years rr_AverageAnnualReturnYear05 8.16%
10 Years rr_AverageAnnualReturnYear10 4.28%
PFI Prospectus | Strategic Asset Management Conservative Balanced Portfolio | Class A  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol SAIPX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 5.50%
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.28%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.09%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.45%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.07%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 653
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 872
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,108
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,784
Annual Return 2014 rr_AnnualReturn2014 5.72%
Annual Return 2015 rr_AnnualReturn2015 (1.17%)
Annual Return 2016 rr_AnnualReturn2016 5.91%
Annual Return 2017 rr_AnnualReturn2017 10.89%
Annual Return 2018 rr_AnnualReturn2018 (4.06%)
Annual Return 2019 rr_AnnualReturn2019 15.49%
Annual Return 2020 rr_AnnualReturn2020 9.03%
Annual Return 2021 rr_AnnualReturn2021 9.17%
Annual Return 2022 rr_AnnualReturn2022 (14.83%)
Annual Return 2023 rr_AnnualReturn2023 11.69%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Highest return for a quarter during the period of the bar chart above:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 10.32%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Lowest return for a quarter during the period of the bar chart above:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (11.74%)
Label rr_AverageAnnualReturnLabel Class A Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 5.50%
5 Years rr_AverageAnnualReturnYear05 4.32%
10 Years rr_AverageAnnualReturnYear10 3.82%
PFI Prospectus | Strategic Asset Management Conservative Balanced Portfolio | Class A | After Taxes on Distributions  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Class A Return After Taxes on Distributions
1 Year rr_AverageAnnualReturnYear01 4.68%
5 Years rr_AverageAnnualReturnYear05 3.13%
10 Years rr_AverageAnnualReturnYear10 2.48%
PFI Prospectus | Strategic Asset Management Conservative Balanced Portfolio | Class A | After Taxes on Distributions and Sales  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Class A Return After Taxes on Distributions and Sale of Fund Shares
1 Year rr_AverageAnnualReturnYear01 3.37%
5 Years rr_AverageAnnualReturnYear05 3.10%
10 Years rr_AverageAnnualReturnYear10 2.62%
PFI Prospectus | Strategic Asset Management Conservative Balanced Portfolio | Class C  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol SCIPX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.28%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.14%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.45%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.87%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 290
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 588
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,011
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,981
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 190
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 588
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,011
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,981
Label rr_AverageAnnualReturnLabel Class C Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 9.79%
5 Years rr_AverageAnnualReturnYear05 4.71%
10 Years rr_AverageAnnualReturnYear10 3.78%
PFI Prospectus | Strategic Asset Management Conservative Balanced Portfolio | Class J  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PCBJX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.28%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.15%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.03%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.45%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.91%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 193
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 290
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 504
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,120
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 93
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 290
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 504
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,120
Label rr_AverageAnnualReturnLabel Class J Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 10.91%
5 Years rr_AverageAnnualReturnYear05 5.71%
10 Years rr_AverageAnnualReturnYear10 4.56%
PFI Prospectus | Strategic Asset Management Conservative Balanced Portfolio | Institutional Class  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PCCIX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.28%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.03%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.45%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.76%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 78
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 243
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 422
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 942
Label rr_AverageAnnualReturnLabel Institutional Class Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 11.99%
5 Years rr_AverageAnnualReturnYear05 5.86%
10 Years rr_AverageAnnualReturnYear10 4.75%
PFI Prospectus | Strategic Asset Management Conservative Balanced Portfolio | Class R-1  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PCSSX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.28%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.35%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.54%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.45%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.62%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 165
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 511
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 881
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,922
Label rr_AverageAnnualReturnLabel Class R-1 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 10.98%
5 Years rr_AverageAnnualReturnYear05 4.93%
10 Years rr_AverageAnnualReturnYear10 3.83%
PFI Prospectus | Strategic Asset Management Conservative Balanced Portfolio | Class R-3  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PCBPX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.28%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.33%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.45%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.31%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 133
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 415
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 718
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,579
Label rr_AverageAnnualReturnLabel Class R-3 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 11.33%
5 Years rr_AverageAnnualReturnYear05 5.27%
10 Years rr_AverageAnnualReturnYear10 4.15%
PFI Prospectus | Strategic Asset Management Conservative Balanced Portfolio | Class R-4  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PCBLX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.28%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.10%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.29%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.45%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.12%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 114
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 356
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 617
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,363
Label rr_AverageAnnualReturnLabel Class R-4 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 11.59%
5 Years rr_AverageAnnualReturnYear05 5.47%
10 Years rr_AverageAnnualReturnYear10 4.35%
PFI Prospectus | Strategic Asset Management Conservative Balanced Portfolio | Class R-5  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PCBFX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.28%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.27%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.45%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.00%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 102
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 318
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 552
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,225
Label rr_AverageAnnualReturnLabel Class R-5 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 11.74%
5 Years rr_AverageAnnualReturnYear05 5.61%
10 Years rr_AverageAnnualReturnYear10 4.48%
PFI Prospectus | Strategic Asset Management Conservative Growth Portfolio  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading SAM (STRATEGIC ASSET MANAGEMENT) CONSERVATIVE GROWTH PORTFOLIO
Objective [Heading] rr_ObjectiveHeading Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The Fund seeks to provide long-term capital appreciation.
Expense [Heading] rr_ExpenseHeading Fees and Expenses of the Fund
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock
This table describes the fees and expenses that you may pay if you buy, hold, and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in Class A Shares of Principal Funds, Inc. More information about these and other discounts is available from your financial intermediary and in “Choosing a Share Class and The Costs of Investing” beginning on page 426 of the Fund’s Prospectus, Appendix B to the Prospectus titled “Intermediary-Specific Sales Charge Waivers and Reductions,” and “Multiple Class Structure” beginning on page 70 of the Fund’s Statement of Additional Information.
If you purchase Institutional Class shares through certain programs offered by certain financial intermediaries, you may be required to pay a commission and/or other forms of compensation to the broker, or to your Financial Professional or other financial intermediary.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder Fees (fees paid directly from your investment)
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock The Fund and each underlying fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs. These costs, which are not reflected in Annual Fund Operating Expenses or in the Example, affect the Fund’s and the underlying fund's performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 25.6% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 25.60%
Expense Breakpoint Discounts [Text] rr_ExpenseBreakpointDiscounts You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in Class A Shares of Principal Funds, Inc.
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 50,000
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example assumes conversion of the Class C shares to Class A shares after the eighth year. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, No Redemption, By Year, Caption [Text] rr_ExpenseExampleNoRedemptionByYearCaption With respect to Classes C and J shares, you would pay the following expenses if you did not redeem your shares (all other classes would be the same as in the above example):
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
The SAM Portfolios operate as funds of funds and invest principally in funds and exchange-traded funds (“ETFs”) of Principal Funds, Inc. and Principal Exchange-Traded Funds (“Underlying Funds”). Each SAM Portfolio generally categorizes each Underlying Fund as a fixed-income, equity, or specialty fund based on its investment profile. Each SAM Portfolio typically allocates its assets among Underlying Funds, and within predetermined percentage ranges, as determined by the SAM Portfolio in accordance with its outlook for the economy, the financial markets, and the relative market valuations of the Underlying Funds. The asset class diversification of the SAM Portfolio is designed to moderate overall price volatility and cushion severe losses in any one investment sector.
The Fund generally invests:
•    between 0% and 40% of its assets in fixed-income funds, and less than 30% in any one fixed-income fund; such funds generally invest in fixed-income instruments such as corporate bonds;
•    between 60% and 100% of its assets in equity funds, and less than 40% in any one equity fund; such funds generally invest in equity securities of domestic and foreign companies (including in emerging markets), including small, medium, and large market capitalization companies, and growth and value stock; and
•    less than 20% of its assets in specialty funds, and less than 20% in any one specialty fund; such funds generally offer unique combinations of traditional equity securities and fixed-income securities or use alternative investment strategies that aim to offer diversification beyond traditional equity and fixed-income securities and include investments in such assets as infrastructure, commodities, currencies, and natural resources companies.
The Fund may temporarily exceed these percentage ranges and may alter the percentage ranges when it deems appropriate.
Strategy Portfolio Concentration [Text] rr_StrategyPortfolioConcentration The Fund generally invests:•    between 0% and 40% of its assets in fixed-income funds, and less than 30% in any one fixed-income fund; such funds generally invest in fixed-income instruments such as corporate bonds;•    between 60% and 100% of its assets in equity funds, and less than 40% in any one equity fund; such funds generally invest in equity securities of domestic and foreign companies (including in emerging markets), including small, medium, and large market capitalization companies, and growth and value stock; and•    less than 20% of its assets in specialty funds, and less than 20% in any one specialty fund; such funds generally offer unique combinations of traditional equity securities and fixed-income securities or use alternative investment strategies that aim to offer diversification beyond traditional equity and fixed-income securities and include investments in such assets as infrastructure, commodities, currencies, and natural resources companies.
Risk [Heading] rr_RiskHeading Principal Risks
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
The following information provides some indication of the risks of investing in the Fund. Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. You may get updated performance information at www.PrincipalAM.com.
The bar chart shows the investment returns of the Fund’s Class A shares for each full calendar year of operations for 10 years (or, if shorter, the life of the Fund). These annual returns do not reflect sales charges on Class A shares; if they did, results would be lower. The table shows for the last one, five, and ten calendar year periods (or, if shorter, the life of the Fund), how the Fund’s average annual total returns compare with those of one or more broad measures of market performance.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following information provides some indication of the risks of investing in the Fund.
Performance Additional Market Index [Text] rr_PerformanceAdditionalMarketIndex The SAM Conservative Growth Blended Index is included as an additional index for the Fund as it shows how the Fund’s performance compares with returns of indices of funds with similar investment objectives.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.PrincipalAM.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.
Bar Chart [Heading] rr_BarChartHeading Total Returns as of December 31
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
Highest return for a quarter during the period of the bar chart above:Q2 202015.98 %
Lowest return for a quarter during the period of the bar chart above:Q1 2020(19.15)%
Performance Table Heading rr_PerformanceTableHeading Average Annual Total ReturnsFor the periods ended December 31, 2023
Performance Table Market Index Changed rr_PerformanceTableMarketIndexChanged Effective March 1, 2024, the Fund changed its primary broad-based index to the Russell 3000 Index in order to meet the revised definition of “broad-based securities market index.”
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are shown for Class A shares only and would be different for the other share classes.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock
After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. After-tax returns are shown for Class A shares only and would be different for the other share classes.
Effective March 1, 2024, the Fund changed its primary broad-based index to the Russell 3000 Index in order to meet the revised definition of “broad-based securities market index.” The SAM Conservative Growth Blended Index is included as an additional index for the Fund as it shows how the Fund’s performance compares with returns of indices of funds with similar investment objectives. Performance of each component of the blended index is also shown. The weightings for SAM Conservative Growth Blended Index are as follows: 60% Russell 3000 Index, 20% MSCI EAFE Index NTR, and 20% Bloomberg U.S. Aggregate Bond Index.
PFI Prospectus | Strategic Asset Management Conservative Growth Portfolio | Risk Lose Money [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Many factors affect that value, and it is possible to lose money by investing in the Fund.
PFI Prospectus | Strategic Asset Management Conservative Growth Portfolio | Risk Not Insured Depository Institution [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
PFI Prospectus | Strategic Asset Management Conservative Growth Portfolio | Emerging Markets Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Emerging Markets Risk. Investments in emerging markets may have more risk than those in developed markets because the emerging markets are less developed and more illiquid. Emerging markets can also be subject to increased social, economic, regulatory, and political uncertainties and can be extremely volatile. The U.S. Securities and Exchange Commission, the U.S. Department of Justice, and other U.S. authorities may be limited in their ability to pursue bad actors in emerging markets, including with respect to fraud.
PFI Prospectus | Strategic Asset Management Conservative Growth Portfolio | Equity Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Equity Securities Risk. A variety of factors can negatively impact the value of equity securities held by a fund, including a decline in the issuer’s financial condition, unfavorable performance of the issuer’s sector or industry, or changes in response to overall market and economic conditions. A fund’s principal market segment(s) (such as market capitalization or style) may underperform other market segments or the equity markets as a whole.
•Growth Style Risk. Growth investing entails the risk that if growth companies do not increase their earnings at a rate expected by investors, the market price of their stock may decline significantly, even if earnings show an absolute increase. Growth company stocks also typically lack the dividend yield that can lessen price declines in market downturns.
•Smaller Companies Risk. Investments in smaller companies may involve greater risk and price volatility than investments in larger, more mature companies. Smaller companies may have limited product lines, markets, or financial resources; lack the competitive strength of larger companies; have less experienced managers; or depend on a few key employees. Their securities often are less widely held and trade less frequently and in lesser quantities, and their market prices often fluctuate more, than securities of larger companies.
•Value Style Risk. Value investing entails the risk that value stocks may continue to be undervalued by the market for extended periods, including the entire period during which the stock is held by a fund, or the events that would cause the stock price to increase may not occur as anticipated or at all. Moreover, a stock that appears to be undervalued actually may be appropriately priced at a low level and, therefore, would not be profitable for the fund.
PFI Prospectus | Strategic Asset Management Conservative Growth Portfolio | Equity Securities Risk, Growth Style Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Growth Style Risk. Growth investing entails the risk that if growth companies do not increase their earnings at a rate expected by investors, the market price of their stock may decline significantly, even if earnings show an absolute increase. Growth company stocks also typically lack the dividend yield that can lessen price declines in market downturns.
PFI Prospectus | Strategic Asset Management Conservative Growth Portfolio | Equity Securities Risk, Smaller Companies Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Smaller Companies Risk. Investments in smaller companies may involve greater risk and price volatility than investments in larger, more mature companies. Smaller companies may have limited product lines, markets, or financial resources; lack the competitive strength of larger companies; have less experienced managers; or depend on a few key employees. Their securities often are less widely held and trade less frequently and in lesser quantities, and their market prices often fluctuate more, than securities of larger companies.
PFI Prospectus | Strategic Asset Management Conservative Growth Portfolio | Equity Securities Risk, Value Style Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Value Style Risk. Value investing entails the risk that value stocks may continue to be undervalued by the market for extended periods, including the entire period during which the stock is held by a fund, or the events that would cause the stock price to increase may not occur as anticipated or at all. Moreover, a stock that appears to be undervalued actually may be appropriately priced at a low level and, therefore, would not be profitable for the fund.
PFI Prospectus | Strategic Asset Management Conservative Growth Portfolio | Fixed-Income Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Fixed-Income Securities Risk. Fixed-income securities are subject to interest rate, credit quality, and liquidity risks. The market value of fixed-income securities generally declines when interest rates rise, and increased interest rates may adversely affect the liquidity of certain fixed-income securities. Moreover, an issuer of fixed-income securities could default on its payment obligations due to increased interest rates or for other reasons.
PFI Prospectus | Strategic Asset Management Conservative Growth Portfolio | Foreign Currency Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Foreign Currency Risk. Risks of investing in securities denominated in, or that trade in, foreign (non-U.S.) currencies include changes in foreign exchange rates and foreign exchange restrictions.
PFI Prospectus | Strategic Asset Management Conservative Growth Portfolio | Foreign Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Foreign Securities Risk. The risks of foreign securities include loss of value as a result of: political or economic instability; nationalization, expropriation, or confiscatory taxation; settlement delays; and limited government regulation (including less stringent reporting, accounting, and disclosure standards than are required of U.S. companies).
PFI Prospectus | Strategic Asset Management Conservative Growth Portfolio | Fund Of Funds Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Fund of Funds Risk. Fund shareholders bear indirectly their proportionate share of the expenses of other investment companies (for example, other mutual funds or exchange-traded funds) in which the Fund invests (“underlying funds”). The Fund’s selection and weighting of asset classes and allocation of investments in underlying funds may cause it to underperform other funds with a similar investment objective. The Fund’s performance and risks correspond directly to the performance and risks of the underlying funds in which it invests, proportionately in accordance with the weightings of such investments, and there is no assurance that the underlying funds will achieve their investment objectives. Management of the Fund entails potential conflicts of interest: the Fund invests in affiliated underlying funds; and PGI and its affiliates may earn different fees from different underlying funds and may have an incentive to allocate more Fund assets to underlying funds from which they receive higher fees.
PFI Prospectus | Strategic Asset Management Conservative Growth Portfolio | Portfolio Duration Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Portfolio Duration Risk. Portfolio duration is a measure of the expected life of a fixed-income security and its sensitivity to changes in interest rates. The longer a fund’s average portfolio duration, the more sensitive the fund will be to changes in interest rates, which means funds with longer average portfolio durations may be more volatile than those with shorter durations.
PFI Prospectus | Strategic Asset Management Conservative Growth Portfolio | Redemption And Large Transaction Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Redemption and Large Transaction Risk. Ownership of the Fund’s shares may be concentrated in one or a few large investors (such as funds of funds, institutional investors, and asset allocation programs) that may redeem or purchase shares in large quantities. These transactions may cause the Fund to sell securities to meet redemptions or to invest additional cash at times it would not otherwise do so, which may result in increased transaction costs, increased expenses, changes to expense ratios, and adverse effects to Fund performance. Such transactions may also accelerate the realization of taxable income if sales of portfolio securities result in gains. Moreover, reallocations by large shareholders among share classes of a fund may result in changes to the expense ratios of affected classes, which may increase the expenses paid by shareholders of the class that experienced the redemption.
PFI Prospectus | Strategic Asset Management Conservative Growth Portfolio | Bloomberg U.S. Aggregate Bond Index (reflects no deduction for fees, expenses, or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
Label rr_AverageAnnualReturnLabel Bloomberg U.S. Aggregate Bond Index (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 5.53%
5 Years rr_AverageAnnualReturnYear05 1.10%
10 Years rr_AverageAnnualReturnYear10 1.81%
PFI Prospectus | Strategic Asset Management Conservative Growth Portfolio | Russell 3000 Index (reflects no deduction for fees, expenses, or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
Label rr_AverageAnnualReturnLabel Russell 3000 Index (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 25.96%
5 Years rr_AverageAnnualReturnYear05 15.16%
10 Years rr_AverageAnnualReturnYear10 11.48%
PFI Prospectus | Strategic Asset Management Conservative Growth Portfolio | SAM Conservative Growth Blended Index (except as noted for MSCI EAFE Index NTR, reflects no deduction for fees, expenses, or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (except as noted for MSCI EAFE Index NTR, reflects no deduction for fees, expenses, or taxes)
Label rr_AverageAnnualReturnLabel SAM Conservative Growth Blended Index (except as noted for MSCI EAFE Index NTR, reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 20.18%
5 Years rr_AverageAnnualReturnYear05 11.10%
10 Years rr_AverageAnnualReturnYear10 8.25%
PFI Prospectus | Strategic Asset Management Conservative Growth Portfolio | MSCI EAFE Index NTR (reflects withholding taxes on foreign dividends, but no deduction for fees, expenses, or other taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects withholding taxes on foreign dividends, but no deduction for fees, expenses, or other taxes)
Label rr_AverageAnnualReturnLabel MSCI EAFE Index NTR (reflects withholding taxes on foreign dividends, but no deduction for fees, expenses, or other taxes)
1 Year rr_AverageAnnualReturnYear01 18.24%
5 Years rr_AverageAnnualReturnYear05 8.16%
10 Years rr_AverageAnnualReturnYear10 4.28%
PFI Prospectus | Strategic Asset Management Conservative Growth Portfolio | Class A  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol SAGPX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 5.50%
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.28%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.09%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.53%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.15%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 661
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 895
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,148
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,871
Annual Return 2014 rr_AnnualReturn2014 6.95%
Annual Return 2015 rr_AnnualReturn2015 (1.63%)
Annual Return 2016 rr_AnnualReturn2016 6.53%
Annual Return 2017 rr_AnnualReturn2017 19.33%
Annual Return 2018 rr_AnnualReturn2018 (7.01%)
Annual Return 2019 rr_AnnualReturn2019 23.54%
Annual Return 2020 rr_AnnualReturn2020 12.53%
Annual Return 2021 rr_AnnualReturn2021 17.21%
Annual Return 2022 rr_AnnualReturn2022 (18.10%)
Annual Return 2023 rr_AnnualReturn2023 18.93%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Highest return for a quarter during the period of the bar chart above:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 15.98%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Lowest return for a quarter during the period of the bar chart above:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (19.15%)
Label rr_AverageAnnualReturnLabel Class A Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 12.42%
5 Years rr_AverageAnnualReturnYear05 8.45%
10 Years rr_AverageAnnualReturnYear10 6.43%
PFI Prospectus | Strategic Asset Management Conservative Growth Portfolio | Class A | After Taxes on Distributions  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Class A Return After Taxes on Distributions
1 Year rr_AverageAnnualReturnYear01 12.08%
5 Years rr_AverageAnnualReturnYear05 7.03%
10 Years rr_AverageAnnualReturnYear10 4.73%
PFI Prospectus | Strategic Asset Management Conservative Growth Portfolio | Class A | After Taxes on Distributions and Sales  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Class A Return After Taxes on Distributions and Sale of Fund Shares
1 Year rr_AverageAnnualReturnYear01 7.56%
5 Years rr_AverageAnnualReturnYear05 6.52%
10 Years rr_AverageAnnualReturnYear10 4.76%
PFI Prospectus | Strategic Asset Management Conservative Growth Portfolio | Class C  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol SCGPX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.28%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.14%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.53%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.95%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 298
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 612
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,052
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 2,067
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 198
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 612
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,052
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 2,067
Label rr_AverageAnnualReturnLabel Class C Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 16.91%
5 Years rr_AverageAnnualReturnYear05 8.82%
10 Years rr_AverageAnnualReturnYear10 6.39%
PFI Prospectus | Strategic Asset Management Conservative Growth Portfolio | Class J  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PCGJX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.28%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.15%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.04%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.53%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.00%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 202
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 318
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 552
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,225
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 102
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 318
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 552
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,225
Label rr_AverageAnnualReturnLabel Class J Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 18.18%
5 Years rr_AverageAnnualReturnYear05 9.86%
10 Years rr_AverageAnnualReturnYear10 7.20%
PFI Prospectus | Strategic Asset Management Conservative Growth Portfolio | Institutional Class  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PCWIX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.28%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.02%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.53%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.83%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 85
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 265
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 460
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,025
Label rr_AverageAnnualReturnLabel Institutional Class Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 19.34%
5 Years rr_AverageAnnualReturnYear05 10.03%
10 Years rr_AverageAnnualReturnYear10 7.39%
PFI Prospectus | Strategic Asset Management Conservative Growth Portfolio | Class R-1  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PCGGX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.28%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.35%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.53%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.53%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.69%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 172
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 533
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 918
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,998
Label rr_AverageAnnualReturnLabel Class R-1 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 18.29%
5 Years rr_AverageAnnualReturnYear05 9.08%
10 Years rr_AverageAnnualReturnYear10 6.46%
PFI Prospectus | Strategic Asset Management Conservative Growth Portfolio | Class R-3  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PCGPX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.28%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.32%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.53%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.38%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 140
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 437
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 755
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,657
Label rr_AverageAnnualReturnLabel Class R-3 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 18.65%
5 Years rr_AverageAnnualReturnYear05 9.43%
10 Years rr_AverageAnnualReturnYear10 6.79%
PFI Prospectus | Strategic Asset Management Conservative Growth Portfolio | Class R-4  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PCWSX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.28%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.10%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.28%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.53%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.19%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 121
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 378
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 654
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,443
Label rr_AverageAnnualReturnLabel Class R-4 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 18.87%
5 Years rr_AverageAnnualReturnYear05 9.64%
10 Years rr_AverageAnnualReturnYear10 6.99%
PFI Prospectus | Strategic Asset Management Conservative Growth Portfolio | Class R-5  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PCWPX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.28%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.26%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.53%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.07%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 109
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 340
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 590
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,306
Label rr_AverageAnnualReturnLabel Class R-5 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 19.04%
5 Years rr_AverageAnnualReturnYear05 9.76%
10 Years rr_AverageAnnualReturnYear10 7.12%
PFI Prospectus | Strategic Asset Management Flexible Income Portfolio  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading SAM (STRATEGIC ASSET MANAGEMENT) FLEXIBLE INCOME PORTFOLIO
Objective [Heading] rr_ObjectiveHeading Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The Fund seeks to provide a high level of total return (consisting of reinvestment of income with some capital appreciation).
Expense [Heading] rr_ExpenseHeading Fees and Expenses of the Fund
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock
This table describes the fees and expenses that you may pay if you buy, hold, and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $100,000 in Class A Shares of Principal Funds, Inc. More information about these and other discounts is available from your financial intermediary and in “Choosing a Share Class and The Costs of Investing” beginning on page 426 of the Fund’s Prospectus, Appendix B to the Prospectus titled “Intermediary-Specific Sales Charge Waivers and Reductions,” and “Multiple Class Structure” beginning on page 70 of the Fund’s Statement of Additional Information.
If you purchase Institutional Class shares through certain programs offered by certain financial intermediaries, you may be required to pay a commission and/or other forms of compensation to the broker, or to your Financial Professional or other financial intermediary.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder Fees (fees paid directly from your investment)
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock The Fund and each underlying fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs. These costs, which are not reflected in Annual Fund Operating Expenses or in the Example, affect the Fund’s and the underlying fund's performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 20.8% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 20.80%
Expense Breakpoint Discounts [Text] rr_ExpenseBreakpointDiscounts You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $100,000 in Class A Shares of Principal Funds, Inc.
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 100,000
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example assumes conversion of the Class C shares to Class A shares after the eighth year. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, No Redemption, By Year, Caption [Text] rr_ExpenseExampleNoRedemptionByYearCaption With respect to Classes C and J shares, you would pay the following expenses if you did not redeem your shares (all other classes would be the same as in the above example):
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
The SAM Portfolios operate as funds of funds and invest principally in funds and exchange-traded funds (“ETFs”) of Principal Funds, Inc. and Principal Exchange-Traded Funds (“Underlying Funds”). Each SAM Portfolio generally categorizes each Underlying Fund as a fixed-income, equity, or specialty fund based on its investment profile. Each SAM Portfolio typically allocates its assets among Underlying Funds, and within predetermined percentage ranges, as determined by the SAM Portfolio in accordance with its outlook for the economy, the financial markets, and the relative market valuations of the Underlying Funds. The asset class diversification of the SAM Portfolio is designed to moderate overall price volatility and cushion severe losses in any one investment sector.
The Fund generally invests:
•    between 55% and 95% of its assets in fixed-income funds, and less than 40% in any one fixed-income fund; such funds generally invest in fixed-income instruments such as high yield securities (or “junk” bonds), securitized products, and corporate bonds;
•    between 5% and 45% of its assets in equity funds, and less than 30% in any one equity fund; such funds generally invest in equity securities of domestic and foreign companies, including small, medium, and large market capitalization companies, and growth and value stock; and
•    less than 20% of its assets in specialty funds, and less than 20% in any one specialty fund; such funds generally offer unique combinations of traditional equity securities and fixed-income securities or use alternative investment strategies that aim to offer diversification beyond traditional equity and fixed-income securities and include investments in such assets as infrastructure, commodities, currencies, and natural resources companies.
The Fund may temporarily exceed these percentage ranges and may alter the percentage ranges when it deems appropriate.
Strategy Portfolio Concentration [Text] rr_StrategyPortfolioConcentration The Fund generally invests:•    between 55% and 95% of its assets in fixed-income funds, and less than 40% in any one fixed-income fund; such funds generally invest in fixed-income instruments such as high yield securities (or “junk” bonds), securitized products, and corporate bonds;•    between 5% and 45% of its assets in equity funds, and less than 30% in any one equity fund; such funds generally invest in equity securities of domestic and foreign companies, including small, medium, and large market capitalization companies, and growth and value stock; and•    less than 20% of its assets in specialty funds, and less than 20% in any one specialty fund; such funds generally offer unique combinations of traditional equity securities and fixed-income securities or use alternative investment strategies that aim to offer diversification beyond traditional equity and fixed-income securities and include investments in such assets as infrastructure, commodities, currencies, and natural resources companies.
Risk [Heading] rr_RiskHeading Principal Risks
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
The following information provides some indication of the risks of investing in the Fund. Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. You may get updated performance information at www.PrincipalAM.com.
The bar chart shows the investment returns of the Fund’s Class A shares for each full calendar year of operations for 10 years (or, if shorter, the life of the Fund). These annual returns do not reflect sales charges on Class A shares; if they did, results would be lower. The table shows for the last one, five, and ten calendar year periods (or, if shorter, the life of the Fund), how the Fund’s average annual total returns compare with those of one or more broad measures of market performance.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following information provides some indication of the risks of investing in the Fund.
Performance Additional Market Index [Text] rr_PerformanceAdditionalMarketIndex The SAM Flexible Income Blended Index is included as an additional index for the Fund as it shows how the Fund’s performance compares with returns of indices of funds with similar investment objectives.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.PrincipalAM.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.
Bar Chart [Heading] rr_BarChartHeading Total Returns as of December 31
Bar Chart Does Not Reflect Sales Loads [Text] rr_BarChartDoesNotReflectSalesLoads These annual returns do not reflect sales charges on Class A shares; if they did, results would be lower.
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
Highest return for a quarter during the period of the bar chart above:Q2 20207.69 %
Lowest return for a quarter during the period of the bar chart above:Q1 2020(8.81)%
Performance Table Heading rr_PerformanceTableHeading Average Annual Total ReturnsFor the periods ended December 31, 2023
Performance Table Market Index Changed rr_PerformanceTableMarketIndexChanged Effective March 1, 2024, the Fund changed its primary broad-based index to the Bloomberg U.S. Aggregate Bond Index in order to meet the revised definition of “broad-based securities market index.”
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are shown for Class A shares only and would be different for the other share classes.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock
After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. After-tax returns are shown for Class A shares only and would be different for the other share classes.
Effective March 1, 2024, the Fund changed its primary broad-based index to the Bloomberg U.S. Aggregate Bond Index in order to meet the revised definition of “broad-based securities market index.” The SAM Flexible Income Blended Index is included as an additional index for the Fund as it shows how the Fund’s performance compares with returns of indices of funds with similar investment objectives. Performance of each component of the blended index is also shown. The weightings for SAM Flexible Income Blended Index are as follows: 75% Bloomberg U.S. Aggregate Bond Index, 20% Russell 3000 Index, and 5% MSCI EAFE Index NTR.
PFI Prospectus | Strategic Asset Management Flexible Income Portfolio | Risk Lose Money [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Many factors affect that value, and it is possible to lose money by investing in the Fund.
PFI Prospectus | Strategic Asset Management Flexible Income Portfolio | Risk Not Insured Depository Institution [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
PFI Prospectus | Strategic Asset Management Flexible Income Portfolio | Equity Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Equity Securities Risk. A variety of factors can negatively impact the value of equity securities held by a fund, including a decline in the issuer’s financial condition, unfavorable performance of the issuer’s sector or industry, or changes in response to overall market and economic conditions. A fund’s principal market segment(s) (such as market capitalization or style) may underperform other market segments or the equity markets as a whole.
•Growth Style Risk. Growth investing entails the risk that if growth companies do not increase their earnings at a rate expected by investors, the market price of their stock may decline significantly, even if earnings show an absolute increase. Growth company stocks also typically lack the dividend yield that can lessen price declines in market downturns.
•Smaller Companies Risk. Investments in smaller companies may involve greater risk and price volatility than investments in larger, more mature companies. Smaller companies may have limited product lines, markets, or financial resources; lack the competitive strength of larger companies; have less experienced managers; or depend on a few key employees. Their securities often are less widely held and trade less frequently and in lesser quantities, and their market prices often fluctuate more, than securities of larger companies.
•Value Style Risk. Value investing entails the risk that value stocks may continue to be undervalued by the market for extended periods, including the entire period during which the stock is held by a fund, or the events that would cause the stock price to increase may not occur as anticipated or at all. Moreover, a stock that appears to be undervalued actually may be appropriately priced at a low level and, therefore, would not be profitable for the fund.
PFI Prospectus | Strategic Asset Management Flexible Income Portfolio | Equity Securities Risk, Growth Style Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Growth Style Risk. Growth investing entails the risk that if growth companies do not increase their earnings at a rate expected by investors, the market price of their stock may decline significantly, even if earnings show an absolute increase. Growth company stocks also typically lack the dividend yield that can lessen price declines in market downturns.
PFI Prospectus | Strategic Asset Management Flexible Income Portfolio | Equity Securities Risk, Smaller Companies Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Smaller Companies Risk. Investments in smaller companies may involve greater risk and price volatility than investments in larger, more mature companies. Smaller companies may have limited product lines, markets, or financial resources; lack the competitive strength of larger companies; have less experienced managers; or depend on a few key employees. Their securities often are less widely held and trade less frequently and in lesser quantities, and their market prices often fluctuate more, than securities of larger companies.
PFI Prospectus | Strategic Asset Management Flexible Income Portfolio | Equity Securities Risk, Value Style Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Value Style Risk. Value investing entails the risk that value stocks may continue to be undervalued by the market for extended periods, including the entire period during which the stock is held by a fund, or the events that would cause the stock price to increase may not occur as anticipated or at all. Moreover, a stock that appears to be undervalued actually may be appropriately priced at a low level and, therefore, would not be profitable for the fund.
PFI Prospectus | Strategic Asset Management Flexible Income Portfolio | Fixed-Income Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Fixed-Income Securities Risk. Fixed-income securities are subject to interest rate, credit quality, and liquidity risks. The market value of fixed-income securities generally declines when interest rates rise, and increased interest rates may adversely affect the liquidity of certain fixed-income securities. Moreover, an issuer of fixed-income securities could default on its payment obligations due to increased interest rates or for other reasons.
PFI Prospectus | Strategic Asset Management Flexible Income Portfolio | Foreign Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Foreign Securities Risk. The risks of foreign securities include loss of value as a result of: political or economic instability; nationalization, expropriation, or confiscatory taxation; settlement delays; and limited government regulation (including less stringent reporting, accounting, and disclosure standards than are required of U.S. companies).
PFI Prospectus | Strategic Asset Management Flexible Income Portfolio | Fund Of Funds Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Fund of Funds Risk. Fund shareholders bear indirectly their proportionate share of the expenses of other investment companies (for example, other mutual funds or exchange-traded funds) in which the Fund invests (“underlying funds”). The Fund’s selection and weighting of asset classes and allocation of investments in underlying funds may cause it to underperform other funds with a similar investment objective. The Fund’s performance and risks correspond directly to the performance and risks of the underlying funds in which it invests, proportionately in accordance with the weightings of such investments, and there is no assurance that the underlying funds will achieve their investment objectives. Management of the Fund entails potential conflicts of interest: the Fund invests in affiliated underlying funds; and PGI and its affiliates may earn different fees from different underlying funds and may have an incentive to allocate more Fund assets to underlying funds from which they receive higher fees.
PFI Prospectus | Strategic Asset Management Flexible Income Portfolio | High Yield Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
High Yield Securities Risk. High yield fixed-income securities (commonly referred to as “junk bonds”) are subject to greater credit quality risk than higher rated fixed-income securities and should be considered speculative.
PFI Prospectus | Strategic Asset Management Flexible Income Portfolio | Portfolio Duration Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Portfolio Duration Risk. Portfolio duration is a measure of the expected life of a fixed-income security and its sensitivity to changes in interest rates. The longer a fund’s average portfolio duration, the more sensitive the fund will be to changes in interest rates, which means funds with longer average portfolio durations may be more volatile than those with shorter durations.
PFI Prospectus | Strategic Asset Management Flexible Income Portfolio | Redemption And Large Transaction Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Redemption and Large Transaction Risk. Ownership of the Fund’s shares may be concentrated in one or a few large investors (such as funds of funds, institutional investors, and asset allocation programs) that may redeem or purchase shares in large quantities. These transactions may cause the Fund to sell securities to meet redemptions or to invest additional cash at times it would not otherwise do so, which may result in increased transaction costs, increased expenses, changes to expense ratios, and adverse effects to Fund performance. Such transactions may also accelerate the realization of taxable income if sales of portfolio securities result in gains. Moreover, reallocations by large shareholders among share classes of a fund may result in changes to the expense ratios of affected classes, which may increase the expenses paid by shareholders of the class that experienced the redemption.
PFI Prospectus | Strategic Asset Management Flexible Income Portfolio | Securitized Products Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Securitized Products Risk. Investments in securitized products are subject to risks similar to traditional fixed-income securities, such as credit, interest rate, liquidity, prepayment, extension, and default risk, as well as additional risks associated with the nature of the assets and the servicing of those assets. Unscheduled prepayments on securitized products may have to be reinvested at lower rates. A reduction in prepayments may increase the effective maturities of these securities, exposing them to the risk of decline in market value over time (extension risk).
PFI Prospectus | Strategic Asset Management Flexible Income Portfolio | Bloomberg U.S. Aggregate Bond Index (reflects no deduction for fees, expenses, or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
Label rr_AverageAnnualReturnLabel Bloomberg U.S. Aggregate Bond Index (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 5.53%
5 Years rr_AverageAnnualReturnYear05 1.10%
10 Years rr_AverageAnnualReturnYear10 1.81%
PFI Prospectus | Strategic Asset Management Flexible Income Portfolio | SAM Flexible Income Blended Index (except as noted for MSCI EAFE Index NTR, reflects no deduction for fees, expenses, or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (except as noted for MSCI EAFE Index NTR, reflects no deduction for fees, expenses, or taxes)
Label rr_AverageAnnualReturnLabel SAM Flexible Income Blended Index (except as noted for MSCI EAFE Index NTR, reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 10.07%
5 Years rr_AverageAnnualReturnYear05 4.41%
10 Years rr_AverageAnnualReturnYear10 4.01%
PFI Prospectus | Strategic Asset Management Flexible Income Portfolio | Russell 3000 Index (reflects no deduction for fees, expenses, or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
Label rr_AverageAnnualReturnLabel Russell 3000 Index (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 25.96%
5 Years rr_AverageAnnualReturnYear05 15.16%
10 Years rr_AverageAnnualReturnYear10 11.48%
PFI Prospectus | Strategic Asset Management Flexible Income Portfolio | MSCI EAFE Index NTR (reflects withholding taxes on foreign dividends, but no deduction for fees, expenses, or other taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects withholding taxes on foreign dividends, but no deduction for fees, expenses, or other taxes)
Label rr_AverageAnnualReturnLabel MSCI EAFE Index NTR (reflects withholding taxes on foreign dividends, but no deduction for fees, expenses, or other taxes)
1 Year rr_AverageAnnualReturnYear01 18.24%
5 Years rr_AverageAnnualReturnYear05 8.16%
10 Years rr_AverageAnnualReturnYear10 4.28%
PFI Prospectus | Strategic Asset Management Flexible Income Portfolio | Class A  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol SAUPX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 3.75%
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.28%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.08%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.40%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.01%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 474
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 684
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 912
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,565
Annual Return 2014 rr_AnnualReturn2014 5.47%
Annual Return 2015 rr_AnnualReturn2015 (1.73%)
Annual Return 2016 rr_AnnualReturn2016 6.45%
Annual Return 2017 rr_AnnualReturn2017 7.81%
Annual Return 2018 rr_AnnualReturn2018 (2.48%)
Annual Return 2019 rr_AnnualReturn2019 12.87%
Annual Return 2020 rr_AnnualReturn2020 6.69%
Annual Return 2021 rr_AnnualReturn2021 6.45%
Annual Return 2022 rr_AnnualReturn2022 (13.46%)
Annual Return 2023 rr_AnnualReturn2023 9.06%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Highest return for a quarter during the period of the bar chart above:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 7.69%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Lowest return for a quarter during the period of the bar chart above:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (8.81%)
Label rr_AverageAnnualReturnLabel Class A Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 4.93%
5 Years rr_AverageAnnualReturnYear05 3.10%
10 Years rr_AverageAnnualReturnYear10 3.05%
PFI Prospectus | Strategic Asset Management Flexible Income Portfolio | Class A | After Taxes on Distributions  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Class A Return After Taxes on Distributions
1 Year rr_AverageAnnualReturnYear01 3.91%
5 Years rr_AverageAnnualReturnYear05 1.96%
10 Years rr_AverageAnnualReturnYear10 1.75%
PFI Prospectus | Strategic Asset Management Flexible Income Portfolio | Class A | After Taxes on Distributions and Sales  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Class A Return After Taxes on Distributions and Sale of Fund Shares
1 Year rr_AverageAnnualReturnYear01 3.00%
5 Years rr_AverageAnnualReturnYear05 2.07%
10 Years rr_AverageAnnualReturnYear10 1.94%
PFI Prospectus | Strategic Asset Management Flexible Income Portfolio | Class C  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol SCUPX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.28%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.12%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.40%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.80%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 283
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 566
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 975
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,908
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 183
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 566
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 975
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,908
Label rr_AverageAnnualReturnLabel Class C Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 7.19%
5 Years rr_AverageAnnualReturnYear05 3.09%
10 Years rr_AverageAnnualReturnYear10 2.82%
PFI Prospectus | Strategic Asset Management Flexible Income Portfolio | Class J  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PFIJX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.28%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.15%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.02%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.40%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.85%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 187
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 271
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 471
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,049
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 87
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 271
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 471
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,049
Label rr_AverageAnnualReturnLabel Class J Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 8.25%
5 Years rr_AverageAnnualReturnYear05 4.06%
10 Years rr_AverageAnnualReturnYear10 3.60%
PFI Prospectus | Strategic Asset Management Flexible Income Portfolio | Institutional Class  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PIFIX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.28%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.04%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.40%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.72%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 74
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 230
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 401
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 894
Label rr_AverageAnnualReturnLabel Institutional Class Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 9.40%
5 Years rr_AverageAnnualReturnYear05 4.19%
10 Years rr_AverageAnnualReturnYear10 3.76%
PFI Prospectus | Strategic Asset Management Flexible Income Portfolio | Class R-1  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PFIGX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.28%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.35%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.53%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.40%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.56%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 159
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 493
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 850
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,856
Label rr_AverageAnnualReturnLabel Class R-1 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 8.46%
5 Years rr_AverageAnnualReturnYear05 3.31%
10 Years rr_AverageAnnualReturnYear10 2.88%
PFI Prospectus | Strategic Asset Management Flexible Income Portfolio | Class R-3  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PFIPX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.28%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.32%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.40%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.25%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 127
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 397
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 686
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,511
Label rr_AverageAnnualReturnLabel Class R-3 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 8.75%
5 Years rr_AverageAnnualReturnYear05 3.63%
10 Years rr_AverageAnnualReturnYear10 3.20%
PFI Prospectus | Strategic Asset Management Flexible Income Portfolio | Class R-4  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PFILX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.28%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.10%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.28%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.40%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.06%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 108
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 337
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 585
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,294
Label rr_AverageAnnualReturnLabel Class R-4 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 9.04%
5 Years rr_AverageAnnualReturnYear05 3.84%
10 Years rr_AverageAnnualReturnYear10 3.40%
PFI Prospectus | Strategic Asset Management Flexible Income Portfolio | Class R-5  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PFIFX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.28%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.26%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.40%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.94%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 96
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 300
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 520
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,155
Label rr_AverageAnnualReturnLabel Class R-5 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 9.08%
5 Years rr_AverageAnnualReturnYear05 3.95%
10 Years rr_AverageAnnualReturnYear10 3.52%
PFI Prospectus | Strategic Asset Management Strategic Growth Portfolio  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading SAM (STRATEGIC ASSET MANAGEMENT) STRATEGIC GROWTH PORTFOLIO
Objective [Heading] rr_ObjectiveHeading Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The Fund seeks to provide long-term capital appreciation.
Expense [Heading] rr_ExpenseHeading Fees and Expenses of the Fund
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock
This table describes the fees and expenses that you may pay if you buy, hold, and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in Class A Shares of Principal Funds, Inc. More information about these and other discounts is available from your financial intermediary and in “Choosing a Share Class and The Costs of Investing” beginning on page 426 of the Fund’s Prospectus, Appendix B to the Prospectus titled “Intermediary-Specific Sales Charge Waivers and Reductions,” and “Multiple Class Structure” beginning on page 70 of the Fund’s Statement of Additional Information.
If you purchase Institutional Class shares through certain programs offered by certain financial intermediaries, you may be required to pay a commission and/or other forms of compensation to the broker, or to your Financial Professional or other financial intermediary.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder Fees (fees paid directly from your investment)
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock The Fund and each underlying fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs. These costs, which are not reflected in Annual Fund Operating Expenses or in the Example, affect the Fund’s and the underlying fund's performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 27.2% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 27.20%
Expense Breakpoint Discounts [Text] rr_ExpenseBreakpointDiscounts You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in Class A Shares of Principal Funds, Inc.
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 50,000
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example assumes conversion of the Class C shares to Class A shares after the eighth year. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, No Redemption, By Year, Caption [Text] rr_ExpenseExampleNoRedemptionByYearCaption With respect to Classes C and J shares, you would pay the following expenses if you did not redeem your shares (all other classes would be the same as in the above example):
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
The SAM Portfolios operate as funds of funds and invest principally in funds and exchange-traded funds (“ETFs”) of Principal Funds, Inc. and Principal Exchange-Traded Funds (“Underlying Funds”). Each SAM Portfolio generally categorizes each Underlying Fund as a fixed-income, equity, or specialty fund based on its investment profile. Each SAM Portfolio typically allocates its assets among Underlying Funds, and within predetermined percentage ranges, as determined by the SAM Portfolio in accordance with its outlook for the economy, the financial markets, and the relative market valuations of the Underlying Funds. The asset class diversification of the SAM Portfolio is designed to moderate overall price volatility and cushion severe losses in any one investment sector.
The Fund generally invests:
•    between 75% and 100% of its assets in equity funds, and less than 50% in any one equity fund; such funds generally invest in equity securities of domestic and foreign companies (including in emerging markets), including small, medium, and large market capitalization companies, and growth and value stock; and
•    less than 20% of its assets in specialty funds, and less than 20% in any one specialty fund; such funds generally offer unique combinations of traditional equity securities or use alternative investment strategies that aim to offer diversification beyond traditional equity securities and include investments in such assets as infrastructure, commodities, currencies, and natural resources companies.
The Fund may temporarily exceed these percentage ranges and may alter the percentage ranges when it deems appropriate.
Strategy Portfolio Concentration [Text] rr_StrategyPortfolioConcentration The Fund generally invests:•    between 75% and 100% of its assets in equity funds, and less than 50% in any one equity fund; such funds generally invest in equity securities of domestic and foreign companies (including in emerging markets), including small, medium, and large market capitalization companies, and growth and value stock; and•    less than 20% of its assets in specialty funds, and less than 20% in any one specialty fund; such funds generally offer unique combinations of traditional equity securities or use alternative investment strategies that aim to offer diversification beyond traditional equity securities and include investments in such assets as infrastructure, commodities, currencies, and natural resources companies.
Risk [Heading] rr_RiskHeading Principal Risks
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
The following information provides some indication of the risks of investing in the Fund. Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. You may get updated performance information at www.PrincipalAM.com.
The bar chart shows the investment returns of the Fund’s Class A shares for each full calendar year of operations for 10 years (or, if shorter, the life of the Fund). These annual returns do not reflect sales charges on Class A shares; if they did, results would be lower. The table shows for the last one, five, and ten calendar year periods (or, if shorter, the life of the Fund), how the Fund’s average annual total returns compare with those of one or more broad measures of market performance.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following information provides some indication of the risks of investing in the Fund.
Performance Additional Market Index [Text] rr_PerformanceAdditionalMarketIndex The SAM Strategic Growth Blended Index is included as an additional index for the Fund as it shows how the Fund’s performance compares with returns of indices of funds with similar investment objectives.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.PrincipalAM.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.
Bar Chart [Heading] rr_BarChartHeading Total Returns as of December 31
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
Highest return for a quarter during the period of the bar chart above:Q2 202019.17 %
Lowest return for a quarter during the period of the bar chart above:Q1 2020(22.15)%
Performance Table Heading rr_PerformanceTableHeading Average Annual Total ReturnsFor the periods ended December 31, 2023
Performance Table Market Index Changed rr_PerformanceTableMarketIndexChanged Effective March 1, 2024, the Fund changed its primary broad-based index to the Russell 3000 Index in order to meet the revised definition of “broad-based securities market index.”
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are shown for Class A shares only and would be different for the other share classes.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock
After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. After-tax returns are shown for Class A shares only and would be different for the other share classes.
Effective March 1, 2024, the Fund changed its primary broad-based index to the Russell 3000 Index in order to meet the revised definition of “broad-based securities market index.” The SAM Strategic Growth Blended Index is included as an additional index for the Fund as it shows how the Fund’s performance compares with returns of indices of funds with similar investment objectives. Performance of each component of the blended index is also shown. The weightings for SAM Strategic Growth Blended Index are as follows: 70% Russell 3000 Index, 25% MSCI EAFE Index NTR, and 5% Bloomberg U.S. Aggregate Bond Index.
PFI Prospectus | Strategic Asset Management Strategic Growth Portfolio | Risk Lose Money [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Many factors affect that value, and it is possible to lose money by investing in the Fund.
PFI Prospectus | Strategic Asset Management Strategic Growth Portfolio | Risk Not Insured Depository Institution [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
PFI Prospectus | Strategic Asset Management Strategic Growth Portfolio | Emerging Markets Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Emerging Markets Risk. Investments in emerging markets may have more risk than those in developed markets because the emerging markets are less developed and more illiquid. Emerging markets can also be subject to increased social, economic, regulatory, and political uncertainties and can be extremely volatile. The U.S. Securities and Exchange Commission, the U.S. Department of Justice, and other U.S. authorities may be limited in their ability to pursue bad actors in emerging markets, including with respect to fraud.
PFI Prospectus | Strategic Asset Management Strategic Growth Portfolio | Equity Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Equity Securities Risk. A variety of factors can negatively impact the value of equity securities held by a fund, including a decline in the issuer’s financial condition, unfavorable performance of the issuer’s sector or industry, or changes in response to overall market and economic conditions. A fund’s principal market segment(s) (such as market capitalization or style) may underperform other market segments or the equity markets as a whole.
•Growth Style Risk. Growth investing entails the risk that if growth companies do not increase their earnings at a rate expected by investors, the market price of their stock may decline significantly, even if earnings show an absolute increase. Growth company stocks also typically lack the dividend yield that can lessen price declines in market downturns.
•Smaller Companies Risk. Investments in smaller companies may involve greater risk and price volatility than investments in larger, more mature companies. Smaller companies may have limited product lines, markets, or financial resources; lack the competitive strength of larger companies; have less experienced managers; or depend on a few key employees. Their securities often are less widely held and trade less frequently and in lesser quantities, and their market prices often fluctuate more, than securities of larger companies.
•Value Style Risk. Value investing entails the risk that value stocks may continue to be undervalued by the market for extended periods, including the entire period during which the stock is held by a fund, or the events that would cause the stock price to increase may not occur as anticipated or at all. Moreover, a stock that appears to be undervalued actually may be appropriately priced at a low level and, therefore, would not be profitable for the fund.
PFI Prospectus | Strategic Asset Management Strategic Growth Portfolio | Equity Securities Risk, Growth Style Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Growth Style Risk. Growth investing entails the risk that if growth companies do not increase their earnings at a rate expected by investors, the market price of their stock may decline significantly, even if earnings show an absolute increase. Growth company stocks also typically lack the dividend yield that can lessen price declines in market downturns.
PFI Prospectus | Strategic Asset Management Strategic Growth Portfolio | Equity Securities Risk, Smaller Companies Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Smaller Companies Risk. Investments in smaller companies may involve greater risk and price volatility than investments in larger, more mature companies. Smaller companies may have limited product lines, markets, or financial resources; lack the competitive strength of larger companies; have less experienced managers; or depend on a few key employees. Their securities often are less widely held and trade less frequently and in lesser quantities, and their market prices often fluctuate more, than securities of larger companies.
PFI Prospectus | Strategic Asset Management Strategic Growth Portfolio | Equity Securities Risk, Value Style Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Value Style Risk. Value investing entails the risk that value stocks may continue to be undervalued by the market for extended periods, including the entire period during which the stock is held by a fund, or the events that would cause the stock price to increase may not occur as anticipated or at all. Moreover, a stock that appears to be undervalued actually may be appropriately priced at a low level and, therefore, would not be profitable for the fund.
PFI Prospectus | Strategic Asset Management Strategic Growth Portfolio | Foreign Currency Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Foreign Currency Risk. Risks of investing in securities denominated in, or that trade in, foreign (non-U.S.) currencies include changes in foreign exchange rates and foreign exchange restrictions.
PFI Prospectus | Strategic Asset Management Strategic Growth Portfolio | Foreign Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Foreign Securities Risk. The risks of foreign securities include loss of value as a result of: political or economic instability; nationalization, expropriation, or confiscatory taxation; settlement delays; and limited government regulation (including less stringent reporting, accounting, and disclosure standards than are required of U.S. companies).
PFI Prospectus | Strategic Asset Management Strategic Growth Portfolio | Fund Of Funds Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Fund of Funds Risk. Fund shareholders bear indirectly their proportionate share of the expenses of other investment companies (for example, other mutual funds or exchange-traded funds) in which the Fund invests (“underlying funds”). The Fund’s selection and weighting of asset classes and allocation of investments in underlying funds may cause it to underperform other funds with a similar investment objective. The Fund’s performance and risks correspond directly to the performance and risks of the underlying funds in which it invests, proportionately in accordance with the weightings of such investments, and there is no assurance that the underlying funds will achieve their investment objectives. Management of the Fund entails potential conflicts of interest: the Fund invests in affiliated underlying funds; and PGI and its affiliates may earn different fees from different underlying funds and may have an incentive to allocate more Fund assets to underlying funds from which they receive higher fees.
PFI Prospectus | Strategic Asset Management Strategic Growth Portfolio | Redemption And Large Transaction Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Redemption and Large Transaction Risk. Ownership of the Fund’s shares may be concentrated in one or a few large investors (such as funds of funds, institutional investors, and asset allocation programs) that may redeem or purchase shares in large quantities. These transactions may cause the Fund to sell securities to meet redemptions or to invest additional cash at times it would not otherwise do so, which may result in increased transaction costs, increased expenses, changes to expense ratios, and adverse effects to Fund performance. Such transactions may also accelerate the realization of taxable income if sales of portfolio securities result in gains. Moreover, reallocations by large shareholders among share classes of a fund may result in changes to the expense ratios of affected classes, which may increase the expenses paid by shareholders of the class that experienced the redemption.
PFI Prospectus | Strategic Asset Management Strategic Growth Portfolio | Bloomberg U.S. Aggregate Bond Index (reflects no deduction for fees, expenses, or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
Label rr_AverageAnnualReturnLabel Bloomberg U.S. Aggregate Bond Index (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 5.53%
5 Years rr_AverageAnnualReturnYear05 1.10%
10 Years rr_AverageAnnualReturnYear10 1.81%
PFI Prospectus | Strategic Asset Management Strategic Growth Portfolio | Russell 3000 Index (reflects no deduction for fees, expenses, or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
Label rr_AverageAnnualReturnLabel Russell 3000 Index (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 25.96%
5 Years rr_AverageAnnualReturnYear05 15.16%
10 Years rr_AverageAnnualReturnYear10 11.48%
PFI Prospectus | Strategic Asset Management Strategic Growth Portfolio | SAM Strategic Growth Blended Index (except as noted for MSCI EAFE Index NTR, reflects no deduction for fees, expenses, or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (except as noted for MSCI EAFE Index NTR, reflects no deduction for fees, expenses, or taxes)
Label rr_AverageAnnualReturnLabel SAM Strategic Growth Blended Index (except as noted for MSCI EAFE Index NTR, reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 22.96%
5 Years rr_AverageAnnualReturnYear05 12.77%
10 Years rr_AverageAnnualReturnYear10 9.25%
PFI Prospectus | Strategic Asset Management Strategic Growth Portfolio | MSCI EAFE Index NTR (reflects withholding taxes on foreign dividends, but no deduction for fees, expenses, or other taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects withholding taxes on foreign dividends, but no deduction for fees, expenses, or other taxes)
Label rr_AverageAnnualReturnLabel MSCI EAFE Index NTR (reflects withholding taxes on foreign dividends, but no deduction for fees, expenses, or other taxes)
1 Year rr_AverageAnnualReturnYear01 18.24%
5 Years rr_AverageAnnualReturnYear05 8.16%
10 Years rr_AverageAnnualReturnYear10 4.28%
PFI Prospectus | Strategic Asset Management Strategic Growth Portfolio | Class A  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol SACAX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 5.50%
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.28%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.10%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.56%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.19%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 665
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 907
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,168
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,914
Annual Return 2014 rr_AnnualReturn2014 8.11%
Annual Return 2015 rr_AnnualReturn2015 (2.19%)
Annual Return 2016 rr_AnnualReturn2016 5.72%
Annual Return 2017 rr_AnnualReturn2017 21.69%
Annual Return 2018 rr_AnnualReturn2018 (8.93%)
Annual Return 2019 rr_AnnualReturn2019 26.86%
Annual Return 2020 rr_AnnualReturn2020 15.11%
Annual Return 2021 rr_AnnualReturn2021 19.42%
Annual Return 2022 rr_AnnualReturn2022 (19.08%)
Annual Return 2023 rr_AnnualReturn2023 21.42%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Highest return for a quarter during the period of the bar chart above:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 19.17%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Lowest return for a quarter during the period of the bar chart above:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (22.15%)
Label rr_AverageAnnualReturnLabel Class A Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 14.77%
5 Years rr_AverageAnnualReturnYear05 10.12%
10 Years rr_AverageAnnualReturnYear10 7.21%
PFI Prospectus | Strategic Asset Management Strategic Growth Portfolio | Class A | After Taxes on Distributions  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Class A Return After Taxes on Distributions
1 Year rr_AverageAnnualReturnYear01 14.47%
5 Years rr_AverageAnnualReturnYear05 8.81%
10 Years rr_AverageAnnualReturnYear10 5.35%
PFI Prospectus | Strategic Asset Management Strategic Growth Portfolio | Class A | After Taxes on Distributions and Sales  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Class A Return After Taxes on Distributions and Sale of Fund Shares
1 Year rr_AverageAnnualReturnYear01 8.98%
5 Years rr_AverageAnnualReturnYear05 7.91%
10 Years rr_AverageAnnualReturnYear10 5.32%
PFI Prospectus | Strategic Asset Management Strategic Growth Portfolio | Class C  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol SWHCX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.28%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.17%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.56%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 2.01%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 304
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 630
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,083
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 2,126
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 204
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 630
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,083
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 2,126
Label rr_AverageAnnualReturnLabel Class C Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 19.45%
5 Years rr_AverageAnnualReturnYear05 10.49%
10 Years rr_AverageAnnualReturnYear10 7.16%
PFI Prospectus | Strategic Asset Management Strategic Growth Portfolio | Class J  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PSWJX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.28%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.15%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.06%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.56%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.05%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 207
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 334
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 579
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,283
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 107
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 334
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 579
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,283
Label rr_AverageAnnualReturnLabel Class J Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 20.59%
5 Years rr_AverageAnnualReturnYear05 11.55%
10 Years rr_AverageAnnualReturnYear10 7.97%
PFI Prospectus | Strategic Asset Management Strategic Growth Portfolio | Institutional Class  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PSWIX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.28%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.02%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.56%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.86%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 88
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 274
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 477
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,061
Label rr_AverageAnnualReturnLabel Institutional Class Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 21.82%
5 Years rr_AverageAnnualReturnYear05 11.73%
10 Years rr_AverageAnnualReturnYear10 8.18%
PFI Prospectus | Strategic Asset Management Strategic Growth Portfolio | Class R-1  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PSGGX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.28%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.35%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.53%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.56%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.72%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 175
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 542
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 933
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 2,030
Label rr_AverageAnnualReturnLabel Class R-1 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 20.82%
5 Years rr_AverageAnnualReturnYear05 10.71%
10 Years rr_AverageAnnualReturnYear10 7.22%
PFI Prospectus | Strategic Asset Management Strategic Growth Portfolio | Class R-3  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PSGPX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.28%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.32%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.56%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.41%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 144
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 446
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 771
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,691
Label rr_AverageAnnualReturnLabel Class R-3 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 21.14%
5 Years rr_AverageAnnualReturnYear05 11.12%
10 Years rr_AverageAnnualReturnYear10 7.58%
PFI Prospectus | Strategic Asset Management Strategic Growth Portfolio | Class R-4  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PSGLX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.28%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.10%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.28%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.56%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.22%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 124
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 387
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 670
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,477
Label rr_AverageAnnualReturnLabel Class R-4 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 21.45%
5 Years rr_AverageAnnualReturnYear05 11.34%
10 Years rr_AverageAnnualReturnYear10 7.79%
PFI Prospectus | Strategic Asset Management Strategic Growth Portfolio | Class R-5  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PSGFX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.28%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.26%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.56%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.10%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 112
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 350
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 606
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,340
Label rr_AverageAnnualReturnLabel Class R-5 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 21.49%
5 Years rr_AverageAnnualReturnYear05 11.46%
10 Years rr_AverageAnnualReturnYear10 7.92%
PFI Prospectus | Short-Term Income Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading SHORT-TERM INCOME FUND
Objective [Heading] rr_ObjectiveHeading Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The Fund seeks to provide as high a level of current income as is consistent with prudent investment management and stability of principal.
Expense [Heading] rr_ExpenseHeading Fees and Expenses of the Fund
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock
This table describes the fees and expenses that you may pay if you buy, hold, and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $100,000 in Class A Shares of Principal Funds, Inc. More information about these and other discounts is available from your financial intermediary and in “Choosing a Share Class and The Costs of Investing” beginning on page 426 of the Fund’s Prospectus, Appendix B to the Prospectus titled “Intermediary-Specific Sales Charge Waivers and Reductions,” and “Multiple Class Structure” beginning on page 70 of the Fund’s Statement of Additional Information.
If you purchase Institutional Class shares through certain programs offered by certain financial intermediaries, you may be required to pay a commission and/or other forms of compensation to the broker, or to your Financial Professional or other financial intermediary.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder Fees (fees paid directly from your investment)
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock
The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in Annual Fund Operating Expenses or in the Example, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 35.4% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 35.40%
Expense Breakpoint Discounts [Text] rr_ExpenseBreakpointDiscounts You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $100,000 in Class A Shares of Principal Funds, Inc.
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 100,000
Expenses Restated to Reflect Current [Text] rr_ExpensesRestatedToReflectCurrent Fees have been restated to reflect current fees.
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example assumes conversion of the Class C shares to Class A shares after the eighth year. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, No Redemption, By Year, Caption [Text] rr_ExpenseExampleNoRedemptionByYearCaption With respect to Classes C and J shares, you would pay the following expenses if you did not redeem your shares (all other classes would be the same as in the above example):
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
The Fund seeks to achieve its investment objective by investing in a broad range of high-quality, fixed-income securities. The Fund invests primarily in high-quality short-term bonds and other fixed-income securities that, at the time of purchase, are rated BBB- or higher by S&P Global Ratings (“S&P Global”) or Baa3 or higher by Moody’s Investors Service, Inc. (“Moody’s”). If the security has been rated by only one of the rating agencies, that rating will determine the security’s rating; if the security is rated differently by the rating agencies, the highest rating will be used; and if the security has not been rated by either of the rating agencies, those selecting such investments will determine the security’s quality. The Fund’s investments also include corporate securities, government securities, mortgage-backed and asset-backed securities (securitized products), and foreign securities.
Under normal circumstances, the Fund maintains an effective maturity of five years or less and an average portfolio duration that is within ±30% of the duration of the Bloomberg Credit 1-3 Year Index, which as of January 31, 2024 was 1.78 years.
The Fund invests in derivatives, including Treasury futures, to manage the fixed-income exposure. A derivative is a financial arrangement, the value of which is derived from, or based on, a traditional security, asset, or market index.
Strategy Portfolio Concentration [Text] rr_StrategyPortfolioConcentration The Fund invests primarily in high-quality short-term bonds and other fixed-income securities that, at the time of purchase, are rated BBB- or higher by S&P Global Ratings (“S&P Global”) or Baa3 or higher by Moody’s Investors Service, Inc. (“Moody’s”)
Risk [Heading] rr_RiskHeading Principal Risks
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
The following information provides some indication of the risks of investing in the Fund. Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. You may get updated performance information at www.PrincipalAM.com.
The bar chart shows the investment returns of the Fund’s Class A shares for each full calendar year of operations for 10 years (or, if shorter, the life of the Fund). These annual returns do not reflect sales charges on Class A shares; if they did, results would be lower. The table shows for the last one, five, and ten calendar year periods (or, if shorter, the life of the Fund), how the Fund’s average annual total returns compare with those of one or more broad measures of market performance.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following information provides some indication of the risks of investing in the Fund.
Performance Additional Market Index [Text] rr_PerformanceAdditionalMarketIndex The Bloomberg Credit 1-3 Year Index is included as an additional index for the Fund as it shows how the Fund’s performance compares with the returns of an index of funds with similar investment objectives.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.PrincipalAM.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.
Bar Chart [Heading] rr_BarChartHeading Total Returns as of December 31
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
Highest return for a quarter during the period of the bar chart above:Q2 20203.37 %
Lowest return for a quarter during the period of the bar chart above:Q1 2022(2.48)%
Performance Table Heading rr_PerformanceTableHeading Average Annual Total ReturnsFor the periods ended December 31, 2023
Performance Table Market Index Changed rr_PerformanceTableMarketIndexChanged Effective March 1, 2024, the Fund changed its primary broad-based index to the Bloomberg U.S. Aggregate Bond Index in order to meet the revised definition of “broad-based securities market index.”
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are shown for Class A shares only and would be different for the other share classes.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock
After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. After-tax returns are shown for Class A shares only and would be different for the other share classes.
Effective March 1, 2024, the Fund changed its primary broad-based index to the Bloomberg U.S. Aggregate Bond Index in order to meet the revised definition of “broad-based securities market index.” The Bloomberg Credit 1-3 Year Index is included as an additional index for the Fund as it shows how the Fund’s performance compares with the returns of an index of funds with similar investment objectives.
PFI Prospectus | Short-Term Income Fund | Risk Lose Money [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Many factors affect that value, and it is possible to lose money by investing in the Fund.
PFI Prospectus | Short-Term Income Fund | Risk Not Insured Depository Institution [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
PFI Prospectus | Short-Term Income Fund | Derivatives Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Derivatives Risk. Derivatives may not move in the direction anticipated by the portfolio manager. Transactions in derivatives may increase volatility, cause the liquidation of portfolio positions when not advantageous to do so, and result in disproportionate losses that may be substantially greater than a fund’s initial investment.
•Futures. Futures contracts involve specific risks, including: the imperfect correlation between the change in market value of the instruments held by the Fund and the price of the futures contract; possible lack of a liquid secondary market for a futures contract and the resulting inability to close a futures contract when desired; counterparty risk; and if the Fund has insufficient cash, it may have to sell securities from its portfolio to meet daily variation margin requirements.
PFI Prospectus | Short-Term Income Fund | Derivatives Risk, Futures Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Futures. Futures contracts involve specific risks, including: the imperfect correlation between the change in market value of the instruments held by the Fund and the price of the futures contract; possible lack of a liquid secondary market for a futures contract and the resulting inability to close a futures contract when desired; counterparty risk; and if the Fund has insufficient cash, it may have to sell securities from its portfolio to meet daily variation margin requirements.
PFI Prospectus | Short-Term Income Fund | Fixed-Income Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Fixed-Income Securities Risk. Fixed-income securities are subject to interest rate, credit quality, and liquidity risks. The market value of fixed-income securities generally declines when interest rates rise, and increased interest rates may adversely affect the liquidity of certain fixed-income securities. Moreover, an issuer of fixed-income securities could default on its payment obligations due to increased interest rates or for other reasons.
PFI Prospectus | Short-Term Income Fund | Foreign Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Foreign Securities Risk. The risks of foreign securities include loss of value as a result of: political or economic instability; nationalization, expropriation, or confiscatory taxation; settlement delays; and limited government regulation (including less stringent reporting, accounting, and disclosure standards than are required of U.S. companies).
PFI Prospectus | Short-Term Income Fund | Portfolio Duration Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Portfolio Duration Risk. Portfolio duration is a measure of the expected life of a fixed-income security and its sensitivity to changes in interest rates. The longer a fund’s average portfolio duration, the more sensitive the fund will be to changes in interest rates, which means funds with longer average portfolio durations may be more volatile than those with shorter durations.
PFI Prospectus | Short-Term Income Fund | Real Estate Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Real Estate Securities Risk. Investing in real estate securities subjects the fund to the risks associated with the real estate market (which are similar to the risks associated with direct ownership in real estate), including declines in real estate values, loss due to casualty or condemnation, property taxes, interest rate changes, increased expenses, cash flow of underlying real estate assets, regulatory changes (including zoning, land use, and rents), and environmental problems, as well as to the risks related to the management skill and creditworthiness of the issuer.
PFI Prospectus | Short-Term Income Fund | Redemption And Large Transaction Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Redemption and Large Transaction Risk. Ownership of the Fund’s shares may be concentrated in one or a few large investors (such as funds of funds, institutional investors, and asset allocation programs) that may redeem or purchase shares in large quantities. These transactions may cause the Fund to sell securities to meet redemptions or to invest additional cash at times it would not otherwise do so, which may result in increased transaction costs, increased expenses, changes to expense ratios, and adverse effects to Fund performance. Such transactions may also accelerate the realization of taxable income if sales of portfolio securities result in gains. Moreover, reallocations by large shareholders among share classes of a fund may result in changes to the expense ratios of affected classes, which may increase the expenses paid by shareholders of the class that experienced the redemption.
PFI Prospectus | Short-Term Income Fund | Securitized Products Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Securitized Products Risk. Investments in securitized products are subject to risks similar to traditional fixed-income securities, such as credit, interest rate, liquidity, prepayment, extension, and default risk, as well as additional risks associated with the nature of the assets and the servicing of those assets. Unscheduled prepayments on securitized products may have to be reinvested at lower rates. A reduction in prepayments may increase the effective maturities of these securities, exposing them to the risk of decline in market value over time (extension risk).
PFI Prospectus | Short-Term Income Fund | U.S. Government Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
U.S. Government Securities Risk. Yields available from U.S. government securities are generally lower than yields from many other fixed-income securities. The value of U.S. government securities may be adversely impacted by changes in interest rates, changes in the credit rating of the U.S. government, or a default by the U.S. government.
PFI Prospectus | Short-Term Income Fund | U.S. Government-Sponsored Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
U.S. Government-Sponsored Securities Risk. Securities issued by U.S. government-sponsored enterprises such as the Federal Home Loan Mortgage Corporation, the Federal National Mortgage Association, and the Federal Home Loan Banks are not issued or guaranteed by the U.S. government.
PFI Prospectus | Short-Term Income Fund | Bloomberg U.S. Aggregate Bond Index (reflects no deduction for fees, expenses, or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
Label rr_AverageAnnualReturnLabel Bloomberg U.S. Aggregate Bond Index (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 5.53%
5 Years rr_AverageAnnualReturnYear05 1.10%
10 Years rr_AverageAnnualReturnYear10 1.81%
PFI Prospectus | Short-Term Income Fund | Bloomberg Credit 1-3 Years Index (reflects no deduction for fees, expenses, or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
Label rr_AverageAnnualReturnLabel Bloomberg Credit 1-3 Year Index (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 5.28%
5 Years rr_AverageAnnualReturnYear05 2.03%
10 Years rr_AverageAnnualReturnYear10 1.75%
PFI Prospectus | Short-Term Income Fund | Class A  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol SRHQX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 2.25%
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.37% [56]
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.15%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.12%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.64%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 289
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 425
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 574
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,005
Annual Return 2014 rr_AnnualReturn2014 1.34%
Annual Return 2015 rr_AnnualReturn2015 0.45%
Annual Return 2016 rr_AnnualReturn2016 2.25%
Annual Return 2017 rr_AnnualReturn2017 1.80%
Annual Return 2018 rr_AnnualReturn2018 0.90%
Annual Return 2019 rr_AnnualReturn2019 4.50%
Annual Return 2020 rr_AnnualReturn2020 3.85%
Annual Return 2021 rr_AnnualReturn2021 (0.95%)
Annual Return 2022 rr_AnnualReturn2022 (3.96%)
Annual Return 2023 rr_AnnualReturn2023 5.75%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Highest return for a quarter during the period of the bar chart above:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 3.37%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Lowest return for a quarter during the period of the bar chart above:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2022
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (2.48%)
Label rr_AverageAnnualReturnLabel Class A Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 3.33%
5 Years rr_AverageAnnualReturnYear05 1.30%
10 Years rr_AverageAnnualReturnYear10 1.33%
PFI Prospectus | Short-Term Income Fund | Class A | After Taxes on Distributions  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Class A Return After Taxes on Distributions
1 Year rr_AverageAnnualReturnYear01 2.10%
5 Years rr_AverageAnnualReturnYear05 0.48%
10 Years rr_AverageAnnualReturnYear10 0.56%
PFI Prospectus | Short-Term Income Fund | Class A | After Taxes on Distributions and Sales  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Class A Return After Taxes on Distributions and Sale of Fund Shares
1 Year rr_AverageAnnualReturnYear01 1.95%
5 Years rr_AverageAnnualReturnYear05 0.66%
10 Years rr_AverageAnnualReturnYear10 0.68%
PFI Prospectus | Short-Term Income Fund | Class C  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol STCCX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.37% [56]
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.25%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.62%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 265
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 511
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 881
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,659
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 165
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 511
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 881
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,659
Label rr_AverageAnnualReturnLabel Class C Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 3.70%
5 Years rr_AverageAnnualReturnYear05 0.83%
10 Years rr_AverageAnnualReturnYear10 0.83%
PFI Prospectus | Short-Term Income Fund | Class J  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PSJIX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.37% [56]
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.15%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.10%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.62%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 163
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 199
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 346
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 774
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 63
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 199
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 346
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 774
Label rr_AverageAnnualReturnLabel Class J Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 4.80%
5 Years rr_AverageAnnualReturnYear05 1.80%
10 Years rr_AverageAnnualReturnYear10 1.56%
PFI Prospectus | Short-Term Income Fund | Institutional Class  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PSHIX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.37% [56]
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.04%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.41%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 42
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 132
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 230
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 518
Label rr_AverageAnnualReturnLabel Institutional Class Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 5.99%
5 Years rr_AverageAnnualReturnYear05 2.01%
10 Years rr_AverageAnnualReturnYear10 1.80%
PFI Prospectus | Short-Term Income Fund | Class R-1  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PSIMX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.37% [56]
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.35%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.53%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.25%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 127
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 397
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 686
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,511
Label rr_AverageAnnualReturnLabel Class R-1 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 5.11%
5 Years rr_AverageAnnualReturnYear05 1.13%
10 Years rr_AverageAnnualReturnYear10 0.93%
PFI Prospectus | Short-Term Income Fund | Class R-3  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PSIOX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.37% [56]
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.32%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.94%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 96
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 300
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 520
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,155
Label rr_AverageAnnualReturnLabel Class R-3 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 5.43%
5 Years rr_AverageAnnualReturnYear05 1.46%
10 Years rr_AverageAnnualReturnYear10 1.25%
PFI Prospectus | Short-Term Income Fund | Class R-4  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PSIPX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.37% [56]
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.10%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.28%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.75%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 77
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 240
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 417
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 930
Label rr_AverageAnnualReturnLabel Class R-4 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 5.63%
5 Years rr_AverageAnnualReturnYear05 1.64%
10 Years rr_AverageAnnualReturnYear10 1.43%
PFI Prospectus | Short-Term Income Fund | Class R-5  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PSIQX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.37% [56]
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.26%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.63%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 64
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 202
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 351
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 786
Label rr_AverageAnnualReturnLabel Class R-5 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 5.84%
5 Years rr_AverageAnnualReturnYear05 1.77%
10 Years rr_AverageAnnualReturnYear10 1.57%
PFI Prospectus | SmallCap Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading SMALLCAP FUND
Objective [Heading] rr_ObjectiveHeading Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The Fund seeks long-term growth of capital.
Expense [Heading] rr_ExpenseHeading Fees and Expenses of the Fund
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock
This table describes the fees and expenses that you may pay if you buy, hold, and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in Class A Shares of Principal Funds, Inc. More information about these and other discounts is available from your financial intermediary and in “Choosing a Share Class and The Costs of Investing” beginning on page 426 of the Fund’s Prospectus, Appendix B to the Prospectus titled “Intermediary-Specific Sales Charge Waivers and Reductions,” and “Multiple Class Structure” beginning on page 70 of the Fund’s Statement of Additional Information.
If you purchase Institutional Class or Class R-6 shares through certain programs offered by certain financial intermediaries, you may be required to pay a commission and/or other forms of compensation to the broker, or to your Financial Professional or other financial intermediary.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder Fees (fees paid directly from your investment)
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock
The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in Annual Fund Operating Expenses or in the Example, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 28.7% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 28.70%
Expense Breakpoint Discounts [Text] rr_ExpenseBreakpointDiscounts You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in Class A Shares of Principal Funds, Inc.
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 50,000
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. The calculation of costs takes into account any applicable contractual fee waivers and/or expense reimbursements for the period noted in the table above. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, No Redemption, By Year, Caption [Text] rr_ExpenseExampleNoRedemptionByYearCaption With respect to Class J shares, you would pay the following expenses if you did not redeem your shares (all other classes would be the same as in the above example):
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
Under normal circumstances, the Fund invests at least 80% of its net assets, plus any borrowings for investment purposes, in equity securities of companies with small market capitalizations at the time of purchase. For this Fund, companies with small market capitalizations are those with market capitalizations within the range of companies comprising the Russell 2000® Index (as of January 31, 2024, this range was between approximately $13.0 million and $27.9 billion). Those managing the Fund’s investments seek to invest in securities of companies that they believe have improving and sustainable business fundamentals, rising investor expectations, and attractive relative valuations.
Strategy Portfolio Concentration [Text] rr_StrategyPortfolioConcentration Under normal circumstances, the Fund invests at least 80% of its net assets, plus any borrowings for investment purposes, in equity securities of companies with small market capitalizations at the time of purchase.
Risk [Heading] rr_RiskHeading Principal Risks
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
The following information provides some indication of the risks of investing in the Fund. Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. You may get updated performance information at www.PrincipalAM.com.
The bar chart shows the investment returns of the Fund’s Class A shares for each full calendar year of operations for 10 years (or, if shorter, the life of the Fund). These annual returns do not reflect sales charges on Class A shares; if they did, results would be lower. The table shows for the last one, five, and ten calendar year periods (or, if shorter, the life of the Fund), how the Fund’s average annual total returns compare with those of one or more broad measures of market performance.
For periods prior to the inception date of Class R-6 shares (November 22, 2016), the performance shown in the table for Class R-6 shares is that of the Fund’s Class R-3 shares, adjusted to reflect the fees and expenses of Class R-6 shares. However, where the adjustment for fees and expenses results in performance for Class R-6 shares that is higher than the historical performance of the Class R-3 shares, the historical performance of the Class R-3 shares is used. These adjustments result in performance for such periods that is no higher than the historical performance of the Class R-3 shares.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following information provides some indication of the risks of investing in the Fund.
Performance Additional Market Index [Text] rr_PerformanceAdditionalMarketIndex The Russell 2000 Index is included as an additional index for the Fund as it shows how the Fund’s performance compares with the returns of an index of funds with similar investment objectives.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.PrincipalAM.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.
Bar Chart [Heading] rr_BarChartHeading Total Returns as of December 31
Bar Chart Does Not Reflect Sales Loads [Text] rr_BarChartDoesNotReflectSalesLoads These annual returns do not reflect sales charges on Class A shares; if they did, results would be lower.
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
Highest return for a quarter during the period of the bar chart above:Q2 202028.39 %
Lowest return for a quarter during the period of the bar chart above:Q1 2020(30.54)%
Performance Table Heading rr_PerformanceTableHeading Average Annual Total ReturnsFor the periods ended December 31, 2023
Performance Table Market Index Changed rr_PerformanceTableMarketIndexChanged Effective March 1, 2024, the Fund changed its primary broad-based index to the Russell 3000 Index in order to meet the revised definition of “broad-based securities market index.”
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are shown for Class A shares only and would be different for the other share classes.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock
After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. After-tax returns are shown for Class A shares only and would be different for the other share classes.
Effective March 1, 2024, the Fund changed its primary broad-based index to the Russell 3000 Index in order to meet the revised definition of “broad-based securities market index.” The Russell 2000 Index is included as an additional index for the Fund as it shows how the Fund’s performance compares with the returns of an index of funds with similar investment objectives.
PFI Prospectus | SmallCap Fund | Risk Lose Money [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Many factors affect that value, and it is possible to lose money by investing in the Fund.
PFI Prospectus | SmallCap Fund | Risk Not Insured Depository Institution [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
PFI Prospectus | SmallCap Fund | Equity Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Equity Securities Risk. A variety of factors can negatively impact the value of equity securities held by a fund, including a decline in the issuer’s financial condition, unfavorable performance of the issuer’s sector or industry, or changes in response to overall market and economic conditions. A fund’s principal market segment(s) (such as market capitalization or style) may underperform other market segments or the equity markets as a whole.
•Smaller Companies Risk. Investments in smaller companies may involve greater risk and price volatility than investments in larger, more mature companies. Smaller companies may have limited product lines, markets, or financial resources; lack the competitive strength of larger companies; have less experienced managers; or depend on a few key employees. Their securities often are less widely held and trade less frequently and in lesser quantities, and their market prices often fluctuate more, than securities of larger companies.
PFI Prospectus | SmallCap Fund | Equity Securities Risk, Smaller Companies Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Smaller Companies Risk. Investments in smaller companies may involve greater risk and price volatility than investments in larger, more mature companies. Smaller companies may have limited product lines, markets, or financial resources; lack the competitive strength of larger companies; have less experienced managers; or depend on a few key employees. Their securities often are less widely held and trade less frequently and in lesser quantities, and their market prices often fluctuate more, than securities of larger companies.
PFI Prospectus | SmallCap Fund | Redemption And Large Transaction Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Redemption and Large Transaction Risk. Ownership of the Fund’s shares may be concentrated in one or a few large investors (such as funds of funds, institutional investors, and asset allocation programs) that may redeem or purchase shares in large quantities. These transactions may cause the Fund to sell securities to meet redemptions or to invest additional cash at times it would not otherwise do so, which may result in increased transaction costs, increased expenses, changes to expense ratios, and adverse effects to Fund performance. Such transactions may also accelerate the realization of taxable income if sales of portfolio securities result in gains. Moreover, reallocations by large shareholders among share classes of a fund may result in changes to the expense ratios of affected classes, which may increase the expenses paid by shareholders of the class that experienced the redemption.
PFI Prospectus | SmallCap Fund | Russell 2000 Value Index (reflects no deduction for fees, expenses, or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
Label rr_AverageAnnualReturnLabel Russell 2000 Index (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 16.93%
5 Years rr_AverageAnnualReturnYear05 9.97%
10 Years rr_AverageAnnualReturnYear10 7.16%
PFI Prospectus | SmallCap Fund | Russell 3000 Index (reflects no deduction for fees, expenses, or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
Label rr_AverageAnnualReturnLabel Russell 3000 Index (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 25.96%
5 Years rr_AverageAnnualReturnYear05 15.16%
10 Years rr_AverageAnnualReturnYear10 11.48%
PFI Prospectus | SmallCap Fund | Class A  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PLLAX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 5.50%
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.74%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.20%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.19%
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.19%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 665
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 907
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,168
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,914
Annual Return 2014 rr_AnnualReturn2014 4.51%
Annual Return 2015 rr_AnnualReturn2015 (0.48%)
Annual Return 2016 rr_AnnualReturn2016 16.79%
Annual Return 2017 rr_AnnualReturn2017 12.41%
Annual Return 2018 rr_AnnualReturn2018 (11.00%)
Annual Return 2019 rr_AnnualReturn2019 27.07%
Annual Return 2020 rr_AnnualReturn2020 21.63%
Annual Return 2021 rr_AnnualReturn2021 19.60%
Annual Return 2022 rr_AnnualReturn2022 (20.40%)
Annual Return 2023 rr_AnnualReturn2023 15.34%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Highest return for a quarter during the period of the bar chart above:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 28.39%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Lowest return for a quarter during the period of the bar chart above:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (30.54%)
Label rr_AverageAnnualReturnLabel Class A Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 9.01%
5 Years rr_AverageAnnualReturnYear05 9.91%
10 Years rr_AverageAnnualReturnYear10 6.90%
PFI Prospectus | SmallCap Fund | Class A | After Taxes on Distributions  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Class A Return After Taxes on Distributions
1 Year rr_AverageAnnualReturnYear01 8.24%
5 Years rr_AverageAnnualReturnYear05 8.92%
10 Years rr_AverageAnnualReturnYear10 5.32%
PFI Prospectus | SmallCap Fund | Class A | After Taxes on Distributions and Sales  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Class A Return After Taxes on Distributions and Sale of Fund Shares
1 Year rr_AverageAnnualReturnYear01 5.86%
5 Years rr_AverageAnnualReturnYear05 7.77%
10 Years rr_AverageAnnualReturnYear10 5.10%
PFI Prospectus | SmallCap Fund | Class J  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PSBJX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.74%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.15%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.15%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.04%
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.04%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 206
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 331
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 574
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,271
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 106
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 331
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 574
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,271
Label rr_AverageAnnualReturnLabel Class J Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 14.57%
5 Years rr_AverageAnnualReturnYear05 11.33%
10 Years rr_AverageAnnualReturnYear10 7.68%
PFI Prospectus | SmallCap Fund | Institutional Class  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PSLIX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.74%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.16%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.90%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.05%) [57]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.85%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 87
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 282
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 494
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,103
Label rr_AverageAnnualReturnLabel Institutional Class Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 15.75%
5 Years rr_AverageAnnualReturnYear05 11.51%
10 Years rr_AverageAnnualReturnYear10 7.90%
PFI Prospectus | SmallCap Fund | Class R-1  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PSABX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.74%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.35%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.53%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.62%
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.62%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 165
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 511
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 881
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,922
Label rr_AverageAnnualReturnLabel Class R-1 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 14.87%
5 Years rr_AverageAnnualReturnYear05 10.66%
10 Years rr_AverageAnnualReturnYear10 7.04%
PFI Prospectus | SmallCap Fund | Class R-3  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PSBMX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.74%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.32%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.31%
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.31%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 133
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 415
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 718
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,579
Label rr_AverageAnnualReturnLabel Class R-3 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 15.17%
5 Years rr_AverageAnnualReturnYear05 11.00%
10 Years rr_AverageAnnualReturnYear10 7.37%
PFI Prospectus | SmallCap Fund | Class R-4  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PSBSX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.74%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.10%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.28%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.12%
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.12%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 114
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 356
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 617
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,363
Label rr_AverageAnnualReturnLabel Class R-4 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 15.41%
5 Years rr_AverageAnnualReturnYear05 11.21%
10 Years rr_AverageAnnualReturnYear10 7.58%
PFI Prospectus | SmallCap Fund | Class R-5  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PSBPX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.74%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.26%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.00%
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.00%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 102
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 318
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 552
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,225
Label rr_AverageAnnualReturnLabel Class R-5 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 15.55%
5 Years rr_AverageAnnualReturnYear05 11.34%
10 Years rr_AverageAnnualReturnYear10 7.71%
PFI Prospectus | SmallCap Fund | Class R-6  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PSMLX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.74%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.03%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.77%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.01%) [57]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.76%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 78
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 245
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 427
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 953
Label rr_AverageAnnualReturnLabel Class R-6 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 15.84%
5 Years rr_AverageAnnualReturnYear05 11.62%
10 Years rr_AverageAnnualReturnYear10 7.79%
PFI Prospectus | SmallCap Growth Fund I  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading SMALLCAP GROWTH FUND I
Objective [Heading] rr_ObjectiveHeading Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The Fund seeks long-term growth of capital.
Expense [Heading] rr_ExpenseHeading Fees and Expenses of the Fund
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock
This table describes the fees and expenses that you may pay if you buy, hold, and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below.
If you purchase Institutional Class or Class R-6 shares through certain programs offered by certain financial intermediaries, you may be required to pay a commission and/or other forms of compensation to the broker, or to your Financial Professional or other financial intermediary.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder Fees (fees paid directly from your investment)
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination February 28, 2025
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock
The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in Annual Fund Operating Expenses or in the Example, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 50.3% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 50.30%
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. The calculation of costs takes into account any applicable contractual fee waivers and/or expense reimbursements for the period noted in the table above. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, No Redemption, By Year, Caption [Text] rr_ExpenseExampleNoRedemptionByYearCaption With respect to Class J shares, you would pay the following expenses if you did not redeem your shares (all other classes would be the same as in the above example):
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
Under normal circumstances, the Fund invests at least 80% of its net assets, plus any borrowings for investment purposes, in equity securities of companies with small market capitalizations at the time of purchase. For this Fund, companies with small market capitalizations are those with market capitalizations equal to or smaller than the greater of: 1) $6.0 billion or 2) the highest market capitalization of the companies comprising the Russell 2000® Growth Index (as of January 31, 2024, this range was between approximately $13.0 million and $27.9 billion). The Fund invests in growth equity securities, an investment strategy that emphasizes buying equity securities of companies whose potential for growth of capital and earnings is expected to be above average.
The Fund is primarily actively managed by the sub-advisors. In addition, Principal Global Investors, LLC may invest up to 30% of the Fund’s assets using an index sampling strategy designed to match the performance of the Russell 2000® Growth Index.
Strategy Portfolio Concentration [Text] rr_StrategyPortfolioConcentration Under normal circumstances, the Fund invests at least 80% of its net assets, plus any borrowings for investment purposes, in equity securities of companies with small market capitalizations at the time of purchase.
Risk [Heading] rr_RiskHeading Principal Risks
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
The following information provides some indication of the risks of investing in the Fund. Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. You may get updated performance information at www.PrincipalAM.com.
The bar chart shows the investment returns of the Fund’s Institutional Class shares for each full calendar year of operations for 10 years (or, if shorter, the life of the Fund). The table shows for the last one, five, and ten calendar year periods (or, if shorter, the life of the Fund), how the Fund’s average annual total returns compare with those of one or more broad measures of market performance.
For periods prior to the inception date of Class R-6 shares (November 25, 2014), the performance shown in the table for Class R-6 shares is that of the Fund’s Institutional Class shares, adjusted to reflect the fees and expenses of Class R-6 shares. These adjustments result in performance for such periods that is no higher than the historical performance of the Institutional Class shares.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following information provides some indication of the risks of investing in the Fund.
Performance Additional Market Index [Text] rr_PerformanceAdditionalMarketIndex The Russell 2000 Growth Index is included as an additional index for the Fund as it shows how the Fund’s performance compares with the returns of an index of funds with similar investment objectives.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.PrincipalAM.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.
Bar Chart [Heading] rr_BarChartHeading Total Returns as of December 31
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
Highest return for a quarter during the period of the bar chart above:Q2 202033.84 %
Lowest return for a quarter during the period of the bar chart above:Q1 2020(22.08)%
Performance Table Heading rr_PerformanceTableHeading Average Annual Total ReturnsFor the periods ended December 31, 2023
Performance Table Market Index Changed rr_PerformanceTableMarketIndexChanged Effective March 1, 2024, the Fund changed its primary broad-based index to the Russell 3000 Index in order to meet the revised definition of “broad-based securities market index.”
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are shown for Institutional Class shares only and would be different for the other share classes.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock
After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. After-tax returns are shown for Institutional Class shares only and would be different for the other share classes.
Effective March 1, 2024, the Fund changed its primary broad-based index to the Russell 3000 Index in order to meet the revised definition of “broad-based securities market index.” The Russell 2000 Growth Index is included as an additional index for the Fund as it shows how the Fund’s performance compares with the returns of an index of funds with similar investment objectives.
PFI Prospectus | SmallCap Growth Fund I | Risk Lose Money [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Many factors affect that value, and it is possible to lose money by investing in the Fund.
PFI Prospectus | SmallCap Growth Fund I | Risk Not Insured Depository Institution [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
PFI Prospectus | SmallCap Growth Fund I | Equity Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Equity Securities Risk. A variety of factors can negatively impact the value of equity securities held by a fund, including a decline in the issuer’s financial condition, unfavorable performance of the issuer’s sector or industry, or changes in response to overall market and economic conditions. A fund’s principal market segment(s) (such as market capitalization or style) may underperform other market segments or the equity markets as a whole.
•Growth Style Risk. Growth investing entails the risk that if growth companies do not increase their earnings at a rate expected by investors, the market price of their stock may decline significantly, even if earnings show an absolute increase. Growth company stocks also typically lack the dividend yield that can lessen price declines in market downturns.
•Smaller Companies Risk. Investments in smaller companies may involve greater risk and price volatility than investments in larger, more mature companies. Smaller companies may have limited product lines, markets, or financial resources; lack the competitive strength of larger companies; have less experienced managers; or depend on a few key employees. Their securities often are less widely held and trade less frequently and in lesser quantities, and their market prices often fluctuate more, than securities of larger companies.
PFI Prospectus | SmallCap Growth Fund I | Equity Securities Risk, Growth Style Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Growth Style Risk. Growth investing entails the risk that if growth companies do not increase their earnings at a rate expected by investors, the market price of their stock may decline significantly, even if earnings show an absolute increase. Growth company stocks also typically lack the dividend yield that can lessen price declines in market downturns.
PFI Prospectus | SmallCap Growth Fund I | Equity Securities Risk, Smaller Companies Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Smaller Companies Risk. Investments in smaller companies may involve greater risk and price volatility than investments in larger, more mature companies. Smaller companies may have limited product lines, markets, or financial resources; lack the competitive strength of larger companies; have less experienced managers; or depend on a few key employees. Their securities often are less widely held and trade less frequently and in lesser quantities, and their market prices often fluctuate more, than securities of larger companies.
PFI Prospectus | SmallCap Growth Fund I | Passive Strategy Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Passive Strategy Risk. A portion of the Fund seeks to match the performance of a specified index. However, the correlation between the performance of this portion of the Fund and index performance may be affected by many factors, such as Fund expenses, the timing of cash flows into and out of the Fund, changes in securities markets, and changes in the composition of the index.
PFI Prospectus | SmallCap Growth Fund I | Redemption And Large Transaction Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Redemption and Large Transaction Risk. Ownership of the Fund’s shares may be concentrated in one or a few large investors (such as funds of funds, institutional investors, and asset allocation programs) that may redeem or purchase shares in large quantities. These transactions may cause the Fund to sell securities to meet redemptions or to invest additional cash at times it would not otherwise do so, which may result in increased transaction costs, increased expenses, changes to expense ratios, and adverse effects to Fund performance. Such transactions may also accelerate the realization of taxable income if sales of portfolio securities result in gains. Moreover, reallocations by large shareholders among share classes of a fund may result in changes to the expense ratios of affected classes, which may increase the expenses paid by shareholders of the class that experienced the redemption.
PFI Prospectus | SmallCap Growth Fund I | Russell 3000 Index (reflects no deduction for fees, expenses, or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
Label rr_AverageAnnualReturnLabel Russell 3000 Index (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 25.96%
5 Years rr_AverageAnnualReturnYear05 15.16%
10 Years rr_AverageAnnualReturnYear10 11.48%
PFI Prospectus | SmallCap Growth Fund I | Russell 2000 Growth Index (reflects no deduction for fees, expenses, or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
Label rr_AverageAnnualReturnLabel Russell 2000 Growth Index (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 18.66%
5 Years rr_AverageAnnualReturnYear05 9.22%
10 Years rr_AverageAnnualReturnYear10 7.16%
PFI Prospectus | SmallCap Growth Fund I | Class J  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PSIJX
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.85%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.15%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.18%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.03%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.21%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.02%) [58],[59]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.19%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 221
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 382
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 663
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,464
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 121
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 382
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 663
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,464
Label rr_AverageAnnualReturnLabel Class J Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 15.34%
5 Years rr_AverageAnnualReturnYear05 10.90%
10 Years rr_AverageAnnualReturnYear10 8.25%
PFI Prospectus | SmallCap Growth Fund I | Institutional Class  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PGRTX
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.85%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.14%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.03%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.02%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.02%) [58],[59]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.00%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 102
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 323
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 561
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,246
Annual Return 2014 rr_AnnualReturn2014 1.54%
Annual Return 2015 rr_AnnualReturn2015 1.19%
Annual Return 2016 rr_AnnualReturn2016 9.25%
Annual Return 2017 rr_AnnualReturn2017 26.32%
Annual Return 2018 rr_AnnualReturn2018 (5.42%)
Annual Return 2019 rr_AnnualReturn2019 33.59%
Annual Return 2020 rr_AnnualReturn2020 42.06%
Annual Return 2021 rr_AnnualReturn2021 7.24%
Annual Return 2022 rr_AnnualReturn2022 (28.55%)
Annual Return 2023 rr_AnnualReturn2023 16.43%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Highest return for a quarter during the period of the bar chart above:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 33.84%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Lowest return for a quarter during the period of the bar chart above:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (22.08%)
Label rr_AverageAnnualReturnLabel Institutional Class Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 16.43%
5 Years rr_AverageAnnualReturnYear05 11.11%
10 Years rr_AverageAnnualReturnYear10 8.55%
PFI Prospectus | SmallCap Growth Fund I | Institutional Class | After Taxes on Distributions  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Institutional Class Return After Taxes on Distributions
1 Year rr_AverageAnnualReturnYear01 16.43%
5 Years rr_AverageAnnualReturnYear05 9.60%
10 Years rr_AverageAnnualReturnYear10 6.39%
PFI Prospectus | SmallCap Growth Fund I | Institutional Class | After Taxes on Distributions and Sales  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Institutional Class Return After Taxes on Distributions and Sale of Fund Shares
1 Year rr_AverageAnnualReturnYear01 9.73%
5 Years rr_AverageAnnualReturnYear05 8.73%
10 Years rr_AverageAnnualReturnYear10 6.33%
PFI Prospectus | SmallCap Growth Fund I | Class R-1  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PNASX
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.85%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.35%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.54%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.03%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.77%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.02%) [58],[59]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.75%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 178
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 555
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 957
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 2,082
Label rr_AverageAnnualReturnLabel Class R-1 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 15.60%
5 Years rr_AverageAnnualReturnYear05 10.24%
10 Years rr_AverageAnnualReturnYear10 7.66%
PFI Prospectus | SmallCap Growth Fund I | Class R-3  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PPNMX
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.85%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.33%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.03%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.46%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.02%) [58],[59]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.44%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 147
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 460
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 796
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,745
Label rr_AverageAnnualReturnLabel Class R-3 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 15.92%
5 Years rr_AverageAnnualReturnYear05 10.56%
10 Years rr_AverageAnnualReturnYear10 8.00%
PFI Prospectus | SmallCap Growth Fund I | Class R-4  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PPNSX
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.85%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.10%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.29%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.03%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.27%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.02%) [58],[59]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.25%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 127
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 401
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 695
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,532
Label rr_AverageAnnualReturnLabel Class R-4 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 16.20%
5 Years rr_AverageAnnualReturnYear05 10.79%
10 Years rr_AverageAnnualReturnYear10 8.21%
PFI Prospectus | SmallCap Growth Fund I | Class R-5  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PPNPX
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.85%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.27%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.03%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.15%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.02%) [58],[59]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.13%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 115
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 363
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 631
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,396
Label rr_AverageAnnualReturnLabel Class R-5 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 16.34%
5 Years rr_AverageAnnualReturnYear05 10.91%
10 Years rr_AverageAnnualReturnYear10 8.33%
PFI Prospectus | SmallCap Growth Fund I | Class R-6  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PCSMX
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.85%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.01%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.03%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.89%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.02%) [58],[59]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.87%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 89
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 282
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 491
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,094
Label rr_AverageAnnualReturnLabel Class R-6 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 16.65%
5 Years rr_AverageAnnualReturnYear05 11.20%
10 Years rr_AverageAnnualReturnYear10 8.59%
PFI Prospectus | SmallCap S&P 600 Index Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading SMALLCAP S&P 600 INDEX FUND
Objective [Heading] rr_ObjectiveHeading Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The Fund seeks long-term growth of capital.
Expense [Heading] rr_ExpenseHeading Fees and Expenses of the Fund
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock
This table describes the fees and expenses that you may pay if you buy, hold, and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below.
If you purchase Institutional Class or Class R-6 shares through certain programs offered by certain financial intermediaries, you may be required to pay a commission and/or other forms of compensation to the broker, or to your Financial Professional or other financial intermediary.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder Fees (fees paid directly from your investment)
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock
The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in Annual Fund Operating Expenses or in the Example, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 27.5% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 27.50%
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. The calculation of costs takes into account any applicable contractual fee waivers and/or expense reimbursements for the period noted in the table above. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, No Redemption, By Year, Caption [Text] rr_ExpenseExampleNoRedemptionByYearCaption With respect to Class J shares, you would pay the following expenses if you did not redeem your shares (all other classes would be the same as in the above example):
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
Under normal circumstances, the Fund invests at least 80% of its net assets, plus any borrowings for investment purposes, in equity securities of companies that compose the Standard & Poor’s (“S&P”) SmallCap 600 Index (the “Index”) at the time of purchase. The Index is designed to represent U.S. equities with risk/return characteristics of the small cap universe. As of January 31, 2024, the market capitalization range of the companies comprising the Index was between approximately $219.9 million and $7.8 billion. Each component stock of the Index is weighted in proportion to its total market value. The Index is rebalanced quarterly.
The Fund employs a passive investment approach designed to attempt to track the performance of the Index. In seeking its objective, the Fund typically employs a replication strategy, which involves investing in all the securities that make up the Index, in the same proportions as the Index.
The Fund uses derivative strategies and invests in exchange-traded funds (“ETFs”). A derivative is a financial arrangement, the value of which is derived from, or based on, a traditional security, asset, or market index. Specifically, the Fund invests in index futures and equity ETFs on a daily basis to gain exposure to the Index in an effort to minimize tracking error relative to the benchmark.
The Fund will not concentrate (i.e., invest more than 25% of its assets) its investments in a particular industry except to the extent the Index is so concentrated. As of January 31, 2024, the Index was not concentrated in any industry.
Note: “Standard & Poor’s SmallCap 600” and “S&P SmallCap 600” are trademarks of S&P Global and have been licensed by Principal. The Fund is not sponsored, endorsed, sold, or promoted by S&P Global, and S&P Global makes no representation regarding the advisability of investing in the Fund.
Strategy Portfolio Concentration [Text] rr_StrategyPortfolioConcentration Under normal circumstances, the Fund invests at least 80% of its net assets, plus any borrowings for investment purposes, in equity securities of companies that compose the Standard & Poor’s (“S&P”) SmallCap 600 Index (the “Index”) at the time of purchase.
Risk [Heading] rr_RiskHeading Principal Risks
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
The following information provides some indication of the risks of investing in the Fund. Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. You may get updated performance information at www.PrincipalAM.com.
The bar chart shows the investment returns of the Fund’s Institutional Class shares for each full calendar year of operations for 10 years (or, if shorter, the life of the Fund). The table shows for the last one, five, and ten calendar year periods (or, if shorter, the life of the Fund), how the Fund’s average annual total returns compare with those of one or more broad measures of market performance.
For periods prior to the inception date of Class R-6 shares (November 22, 2016), the performance shown in the table for Class R-6 shares is that of the Fund’s Class R-3 shares, adjusted to reflect the fees and expenses of Class R-6 shares. However, where the adjustment for fees and expenses results in performance for Class R-6 shares that is higher than the historical performance of the Class R-3 shares, the historical performance of the Class R-3 shares is used. These adjustments result in performance for such periods that is no higher than the historical performance of the Class R-3 shares.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following information provides some indication of the risks of investing in the Fund.
Performance Additional Market Index [Text] rr_PerformanceAdditionalMarketIndex The S&P SmallCap 600 Index is included as an additional index for the Fund as it shows how the Fund’s performance compares with the returns of an index of funds with similar investment objectives.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.PrincipalAM.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.
Bar Chart [Heading] rr_BarChartHeading Total Returns as of December 31
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
Highest return for a quarter during the period of the bar chart above:Q4 202031.18 %
Lowest return for a quarter during the period of the bar chart above:Q1 2020(32.65)%
Performance Table Heading rr_PerformanceTableHeading Average Annual Total ReturnsFor the periods ended December 31, 2023
Performance Table Market Index Changed rr_PerformanceTableMarketIndexChanged Effective March 1, 2024, the Fund changed its primary broad-based index to the S&P 1500 TR in order to meet the revised definition of “broad-based securities market index.”
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are shown for Institutional Class shares only and would be different for the other share classes.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock
After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. After-tax returns are shown for Institutional Class shares only and would be different for the other share classes.
Effective March 1, 2024, the Fund changed its primary broad-based index to the S&P 1500 TR in order to meet the revised definition of “broad-based securities market index.” The S&P SmallCap 600 Index is included as an additional index for the Fund as it shows how the Fund’s performance compares with the returns of an index of funds with similar investment objectives.
PFI Prospectus | SmallCap S&P 600 Index Fund | Risk Lose Money [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Many factors affect that value, and it is possible to lose money by investing in the Fund.
PFI Prospectus | SmallCap S&P 600 Index Fund | Risk Not Insured Depository Institution [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
PFI Prospectus | SmallCap S&P 600 Index Fund | Derivatives Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Derivatives Risk. Derivatives may not move in the direction anticipated by the portfolio manager. Transactions in derivatives may increase volatility, cause the liquidation of portfolio positions when not advantageous to do so, and result in disproportionate losses that may be substantially greater than a fund’s initial investment.
•Futures. Futures contracts involve specific risks, including: the imperfect correlation between the change in market value of the instruments held by the Fund and the price of the futures contract; possible lack of a liquid secondary market for a futures contract and the resulting inability to close a futures contract when desired; counterparty risk; and if the Fund has insufficient cash, it may have to sell securities from its portfolio to meet daily variation margin requirements.
PFI Prospectus | SmallCap S&P 600 Index Fund | Derivatives Risk, Futures Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Futures. Futures contracts involve specific risks, including: the imperfect correlation between the change in market value of the instruments held by the Fund and the price of the futures contract; possible lack of a liquid secondary market for a futures contract and the resulting inability to close a futures contract when desired; counterparty risk; and if the Fund has insufficient cash, it may have to sell securities from its portfolio to meet daily variation margin requirements.
PFI Prospectus | SmallCap S&P 600 Index Fund | Equity Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Equity Securities Risk. A variety of factors can negatively impact the value of equity securities held by a fund, including a decline in the issuer’s financial condition, unfavorable performance of the issuer’s sector or industry, or changes in response to overall market and economic conditions. A fund’s principal market segment(s) (such as market capitalization or style) may underperform other market segments or the equity markets as a whole.
•Smaller Companies Risk. Investments in smaller companies may involve greater risk and price volatility than investments in larger, more mature companies. Smaller companies may have limited product lines, markets, or financial resources; lack the competitive strength of larger companies; have less experienced managers; or depend on a few key employees. Their securities often are less widely held and trade less frequently and in lesser quantities, and their market prices often fluctuate more, than securities of larger companies.
PFI Prospectus | SmallCap S&P 600 Index Fund | Equity Securities Risk, Smaller Companies Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Smaller Companies Risk. Investments in smaller companies may involve greater risk and price volatility than investments in larger, more mature companies. Smaller companies may have limited product lines, markets, or financial resources; lack the competitive strength of larger companies; have less experienced managers; or depend on a few key employees. Their securities often are less widely held and trade less frequently and in lesser quantities, and their market prices often fluctuate more, than securities of larger companies.
PFI Prospectus | SmallCap S&P 600 Index Fund | Index Fund Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Index Fund Risk. Index funds use a passive investment approach and generally do not attempt to manage market volatility, use defensive strategies, or reduce the effect of any long-term periods of poor investment performance. Therefore, the Fund may hold securities that present risks that an investment advisor researching individual securities might seek to avoid. An index fund has operating and other expenses while an index does not. As a result, over time, index funds tend to underperform the index. The correlation between fund performance and index performance may also be affected by the type of passive investment approach used by a fund (sampling or replication), changes in securities markets, changes in the composition of the index, and the timing of purchases and sales of fund shares. Errors or delays in compiling or rebalancing the Index may impact the performance of the Fund and increase transaction costs.
PFI Prospectus | SmallCap S&P 600 Index Fund | Industry Concentration Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Industry Concentration Risk. A fund that concentrates investments in a particular industry or group of industries has greater exposure than other funds to market, economic, and other factors affecting that industry or group of industries.
PFI Prospectus | SmallCap S&P 600 Index Fund | Investment Company Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Investment Company Securities Risk. A fund that invests in another investment company (for example, another fund or an exchange-traded fund (or ETF)) is subject to the risks associated with direct ownership of the securities in which such investment company invests. Fund shareholders indirectly bear their proportionate share of the expenses of each such investment company.
PFI Prospectus | SmallCap S&P 600 Index Fund | Redemption And Large Transaction Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Redemption and Large Transaction Risk. Ownership of the Fund’s shares may be concentrated in one or a few large investors (such as funds of funds, institutional investors, and asset allocation programs) that may redeem or purchase shares in large quantities. These transactions may cause the Fund to sell securities to meet redemptions or to invest additional cash at times it would not otherwise do so, which may result in increased transaction costs, increased expenses, changes to expense ratios, and adverse effects to Fund performance. Such transactions may also accelerate the realization of taxable income if sales of portfolio securities result in gains. Moreover, reallocations by large shareholders among share classes of a fund may result in changes to the expense ratios of affected classes, which may increase the expenses paid by shareholders of the class that experienced the redemption.
PFI Prospectus | SmallCap S&P 600 Index Fund | S&P 500 Index (reflects no deduction for fees, expenses, or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
Label rr_AverageAnnualReturnLabel S&P 1500 TR (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 25.47%
5 Years rr_AverageAnnualReturnYear05 15.39%
10 Years rr_AverageAnnualReturnYear10 11.76%
PFI Prospectus | SmallCap S&P 600 Index Fund | S&P SmallCap 600 Index [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
Label rr_AverageAnnualReturnLabel S&P SmallCap 600 Index (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 16.05%
5 Years rr_AverageAnnualReturnYear05 11.03%
10 Years rr_AverageAnnualReturnYear10 8.66%
PFI Prospectus | SmallCap S&P 600 Index Fund | Class J  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PSSJX
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.15%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.15%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.14%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.44%
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.44%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 145
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 141
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 246
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 555
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 45
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 141
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 246
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 555
Label rr_AverageAnnualReturnLabel Class J Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 14.59%
5 Years rr_AverageAnnualReturnYear05 10.55%
10 Years rr_AverageAnnualReturnYear10 8.16%
PFI Prospectus | SmallCap S&P 600 Index Fund | Institutional Class  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PSSIX
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.15%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.10%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.25%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.04%) [60]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.21%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 22
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 76
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 137
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 314
Annual Return 2014 rr_AnnualReturn2014 5.52%
Annual Return 2015 rr_AnnualReturn2015 (2.22%)
Annual Return 2016 rr_AnnualReturn2016 26.18%
Annual Return 2017 rr_AnnualReturn2017 13.01%
Annual Return 2018 rr_AnnualReturn2018 (8.74%)
Annual Return 2019 rr_AnnualReturn2019 22.58%
Annual Return 2020 rr_AnnualReturn2020 11.22%
Annual Return 2021 rr_AnnualReturn2021 26.20%
Annual Return 2022 rr_AnnualReturn2022 (16.33%)
Annual Return 2023 rr_AnnualReturn2023 15.80%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Highest return for a quarter during the period of the bar chart above:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Dec. 31, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 31.18%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Lowest return for a quarter during the period of the bar chart above:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (32.65%)
Label rr_AverageAnnualReturnLabel Institutional Class Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 15.80%
5 Years rr_AverageAnnualReturnYear05 10.76%
10 Years rr_AverageAnnualReturnYear10 8.39%
PFI Prospectus | SmallCap S&P 600 Index Fund | Institutional Class | After Taxes on Distributions  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Institutional Class Return After Taxes on Distributions
1 Year rr_AverageAnnualReturnYear01 14.57%
5 Years rr_AverageAnnualReturnYear05 8.97%
10 Years rr_AverageAnnualReturnYear10 6.38%
PFI Prospectus | SmallCap S&P 600 Index Fund | Institutional Class | After Taxes on Distributions and Sales  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Institutional Class Return After Taxes on Distributions and Sale of Fund Shares
1 Year rr_AverageAnnualReturnYear01 10.14%
5 Years rr_AverageAnnualReturnYear05 8.31%
10 Years rr_AverageAnnualReturnYear10 6.27%
PFI Prospectus | SmallCap S&P 600 Index Fund | Class R-1  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PSAPX
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.15%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.35%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.54%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.04%
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.04%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 106
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 331
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 574
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,271
Label rr_AverageAnnualReturnLabel Class R-1 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 14.87%
5 Years rr_AverageAnnualReturnYear05 9.86%
10 Years rr_AverageAnnualReturnYear10 7.51%
PFI Prospectus | SmallCap S&P 600 Index Fund | Class R-3  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PSSMX
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.15%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.33%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.73%
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.73%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 75
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 233
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 406
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 906
Label rr_AverageAnnualReturnLabel Class R-3 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 15.21%
5 Years rr_AverageAnnualReturnYear05 10.20%
10 Years rr_AverageAnnualReturnYear10 7.84%
PFI Prospectus | SmallCap S&P 600 Index Fund | Class R-4  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PSSSX
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.15%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.10%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.29%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.54%
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.54%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 55
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 173
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 302
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 677
Label rr_AverageAnnualReturnLabel Class R-4 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 15.42%
5 Years rr_AverageAnnualReturnYear05 10.41%
10 Years rr_AverageAnnualReturnYear10 8.04%
PFI Prospectus | SmallCap S&P 600 Index Fund | Class R-5  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PSSPX
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.15%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.27%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.42%
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.42%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 43
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 135
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 235
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 530
Label rr_AverageAnnualReturnLabel Class R-5 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 15.58%
5 Years rr_AverageAnnualReturnYear05 10.55%
10 Years rr_AverageAnnualReturnYear10 8.18%
PFI Prospectus | SmallCap S&P 600 Index Fund | Class R-6  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PSPIX
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.15%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.02%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.17%
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.17%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 17
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 55
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 96
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 217
Label rr_AverageAnnualReturnLabel Class R-6 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 15.86%
5 Years rr_AverageAnnualReturnYear05 10.82%
10 Years rr_AverageAnnualReturnYear10 8.27%
PFI Prospectus | SmallCap Value Fund II  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading SMALLCAP VALUE FUND II
Objective [Heading] rr_ObjectiveHeading Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The Fund seeks long-term growth of capital.
Expense [Heading] rr_ExpenseHeading Fees and Expenses of the Fund
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock
This table describes the fees and expenses that you may pay if you buy, hold, and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below.
If you purchase Institutional Class or Class R-6 shares through certain programs offered by certain financial intermediaries, you may be required to pay a commission and/or other forms of compensation to the broker, or to your Financial Professional or other financial intermediary.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder Fees (fees paid directly from your investment)
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination February 28, 2025
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock
The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in Annual Fund Operating Expenses or in the Example, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 65.2% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 65.20%
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. The calculation of costs takes into account any applicable contractual fee waivers and/or expense reimbursements for the period noted in the table above. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, No Redemption, By Year, Caption [Text] rr_ExpenseExampleNoRedemptionByYearCaption With respect to Class J shares, you would pay the following expenses if you did not redeem your shares (all other classes would be the same as in the above example):
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
Under normal circumstances, the Fund invests at least 80% of its net assets, plus any borrowings for investment purposes, in equity securities of companies with small market capitalizations at the time of purchase. For this Fund, companies with small market capitalizations are those with market capitalizations of one or both of the following: $3.5 billion or less, or within the range of companies composing the Russell 2000® Value Index (as of January 31, 2024, this range was between approximately $13.0 million and $8.1 billion). The Fund invests in value equity securities, an investment strategy that emphasizes buying equity securities that appear to be undervalued.
The Fund is primarily actively managed by the sub-advisors. In addition, Principal Global Investors, LLC may invest up to 30% of the Fund’s assets using an index sampling strategy designed to match the performance of the Russell 2000® Value Index.
Strategy Portfolio Concentration [Text] rr_StrategyPortfolioConcentration Under normal circumstances, the Fund invests at least 80% of its net assets, plus any borrowings for investment purposes, in equity securities of companies with small market capitalizations at the time of purchase.
Risk [Heading] rr_RiskHeading Principal Risks
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
The following information provides some indication of the risks of investing in the Fund. Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. You may get updated performance information at www.PrincipalAM.com.
The bar chart shows the investment returns of the Fund’s Institutional Class shares for each full calendar year of operations for 10 years (or, if shorter, the life of the Fund). The table shows for the last one, five, and ten calendar year periods (or, if shorter, the life of the Fund), how the Fund’s average annual total returns compare with those of one or more broad measures of market performance.
For periods prior to the inception date of Class R-6 shares (November 25, 2014), the performance shown in the table for Class R-6 shares is that of the Fund’s Institutional Class shares, adjusted to reflect the fees and expenses of Class R-6 shares. These adjustments result in performance for such periods that is no higher than the historical performance of the Institutional Class shares.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following information provides some indication of the risks of investing in the Fund.
Performance Additional Market Index [Text] rr_PerformanceAdditionalMarketIndex The Russell 2000 Value Index is included as an additional index for the Fund as it shows how the Fund’s performance compares with the returns of an index of funds with similar investment objectives.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.PrincipalAM.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.
Bar Chart [Heading] rr_BarChartHeading Total Returns as of December 31
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
Highest return for a quarter during the period of the bar chart above:Q4 202031.34 %
Lowest return for a quarter during the period of the bar chart above:Q1 2020(35.49)%
Performance Table Heading rr_PerformanceTableHeading Average Annual Total ReturnsFor the periods ended December 31, 2023
Performance Table Market Index Changed rr_PerformanceTableMarketIndexChanged Effective March 1, 2024, the Fund changed its primary broad-based index to the Russell 3000 Index in order to meet the revised definition of “broad-based securities market index.”
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are shown for Institutional Class shares only and would be different for the other share classes.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock
After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. After-tax returns are shown for Institutional Class shares only and would be different for the other share classes.
Effective March 1, 2024, the Fund changed its primary broad-based index to the Russell 3000 Index in order to meet the revised definition of “broad-based securities market index.” The Russell 2000 Value Index is included as an additional index for the Fund as it shows how the Fund’s performance compares with the returns of an index of funds with similar investment objectives.
PFI Prospectus | SmallCap Value Fund II | Risk Lose Money [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Many factors affect that value, and it is possible to lose money by investing in the Fund.
PFI Prospectus | SmallCap Value Fund II | Risk Not Insured Depository Institution [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
PFI Prospectus | SmallCap Value Fund II | Equity Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Equity Securities Risk. A variety of factors can negatively impact the value of equity securities held by a fund, including a decline in the issuer’s financial condition, unfavorable performance of the issuer’s sector or industry, or changes in response to overall market and economic conditions. A fund’s principal market segment(s) (such as market capitalization or style) may underperform other market segments or the equity markets as a whole.
•Smaller Companies Risk. Investments in smaller companies may involve greater risk and price volatility than investments in larger, more mature companies. Smaller companies may have limited product lines, markets, or financial resources; lack the competitive strength of larger companies; have less experienced managers; or depend on a few key employees. Their securities often are less widely held and trade less frequently and in lesser quantities, and their market prices often fluctuate more, than securities of larger companies.
•Value Style Risk. Value investing entails the risk that value stocks may continue to be undervalued by the market for extended periods, including the entire period during which the stock is held by a fund, or the events that would cause the stock price to increase may not occur as anticipated or at all. Moreover, a stock that appears to be undervalued actually may be appropriately priced at a low level and, therefore, would not be profitable for the fund.
PFI Prospectus | SmallCap Value Fund II | Equity Securities Risk, Smaller Companies Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Smaller Companies Risk. Investments in smaller companies may involve greater risk and price volatility than investments in larger, more mature companies. Smaller companies may have limited product lines, markets, or financial resources; lack the competitive strength of larger companies; have less experienced managers; or depend on a few key employees. Their securities often are less widely held and trade less frequently and in lesser quantities, and their market prices often fluctuate more, than securities of larger companies.
PFI Prospectus | SmallCap Value Fund II | Equity Securities Risk, Value Style Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Value Style Risk. Value investing entails the risk that value stocks may continue to be undervalued by the market for extended periods, including the entire period during which the stock is held by a fund, or the events that would cause the stock price to increase may not occur as anticipated or at all. Moreover, a stock that appears to be undervalued actually may be appropriately priced at a low level and, therefore, would not be profitable for the fund.
PFI Prospectus | SmallCap Value Fund II | Passive Strategy Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Passive Strategy Risk. A portion of the Fund seeks to match the performance of a specified index. However, the correlation between the performance of this portion of the Fund and index performance may be affected by many factors, such as Fund expenses, the timing of cash flows into and out of the Fund, changes in securities markets, and changes in the composition of the index.
PFI Prospectus | SmallCap Value Fund II | Real Estate Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Real Estate Securities Risk. Investing in real estate securities subjects the fund to the risks associated with the real estate market (which are similar to the risks associated with direct ownership in real estate), including declines in real estate values, loss due to casualty or condemnation, property taxes, interest rate changes, increased expenses, cash flow of underlying real estate assets, regulatory changes (including zoning, land use, and rents), and environmental problems, as well as to the risks related to the management skill and creditworthiness of the issuer.
PFI Prospectus | SmallCap Value Fund II | Redemption And Large Transaction Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Redemption and Large Transaction Risk. Ownership of the Fund’s shares may be concentrated in one or a few large investors (such as funds of funds, institutional investors, and asset allocation programs) that may redeem or purchase shares in large quantities. These transactions may cause the Fund to sell securities to meet redemptions or to invest additional cash at times it would not otherwise do so, which may result in increased transaction costs, increased expenses, changes to expense ratios, and adverse effects to Fund performance. Such transactions may also accelerate the realization of taxable income if sales of portfolio securities result in gains. Moreover, reallocations by large shareholders among share classes of a fund may result in changes to the expense ratios of affected classes, which may increase the expenses paid by shareholders of the class that experienced the redemption.
PFI Prospectus | SmallCap Value Fund II | Russell 2000 Value Index (reflects no deduction for fees, expenses, or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Russell 2000 Value Index (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 14.65%
5 Years rr_AverageAnnualReturnYear05 10.00%
10 Years rr_AverageAnnualReturnYear10 6.76%
PFI Prospectus | SmallCap Value Fund II | Russell 3000 Index (reflects no deduction for fees, expenses, or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
Label rr_AverageAnnualReturnLabel Russell 3000 Index (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 25.96%
5 Years rr_AverageAnnualReturnYear05 15.16%
10 Years rr_AverageAnnualReturnYear10 11.48%
PFI Prospectus | SmallCap Value Fund II | Class J  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PSMJX
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.94%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.15%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.26%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.36%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.02%) [61],[62]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.34%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 236
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 429
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 743
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,633
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 136
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 429
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 743
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,633
Label rr_AverageAnnualReturnLabel Class J Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 18.69%
5 Years rr_AverageAnnualReturnYear05 12.55%
10 Years rr_AverageAnnualReturnYear10 7.52%
PFI Prospectus | SmallCap Value Fund II | Institutional Class  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PPVIX
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.94%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.16%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.11%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.14%) [61],[62]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.97%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 99
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 339
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 598
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,339
Annual Return 2014 rr_AnnualReturn2014 6.07%
Annual Return 2015 rr_AnnualReturn2015 (4.01%)
Annual Return 2016 rr_AnnualReturn2016 25.28%
Annual Return 2017 rr_AnnualReturn2017 6.92%
Annual Return 2018 rr_AnnualReturn2018 (14.39%)
Annual Return 2019 rr_AnnualReturn2019 23.19%
Annual Return 2020 rr_AnnualReturn2020 3.62%
Annual Return 2021 rr_AnnualReturn2021 32.34%
Annual Return 2022 rr_AnnualReturn2022 (9.24%)
Annual Return 2023 rr_AnnualReturn2023 20.01%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Highest return for a quarter during the period of the bar chart above:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Dec. 31, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 31.34%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Lowest return for a quarter during the period of the bar chart above:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (35.49%)
Label rr_AverageAnnualReturnLabel Institutional Class Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 20.01%
5 Years rr_AverageAnnualReturnYear05 12.97%
10 Years rr_AverageAnnualReturnYear10 7.95%
PFI Prospectus | SmallCap Value Fund II | Institutional Class | After Taxes on Distributions  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Institutional Class Return After Taxes on Distributions
1 Year rr_AverageAnnualReturnYear01 18.89%
5 Years rr_AverageAnnualReturnYear05 10.95%
10 Years rr_AverageAnnualReturnYear10 5.46%
PFI Prospectus | SmallCap Value Fund II | Institutional Class | After Taxes on Distributions and Sales  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Institutional Class Return After Taxes on Distributions and Sale of Fund Shares
1 Year rr_AverageAnnualReturnYear01 12.22%
5 Years rr_AverageAnnualReturnYear05 9.76%
10 Years rr_AverageAnnualReturnYear10 5.54%
PFI Prospectus | SmallCap Value Fund II | Class R-1  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PCPTX
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.94%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.35%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.54%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.84%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.02%) [61],[62]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.82%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 185
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 577
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 994
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 2,157
Label rr_AverageAnnualReturnLabel Class R-1 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 19.17%
5 Years rr_AverageAnnualReturnYear05 12.03%
10 Years rr_AverageAnnualReturnYear10 7.04%
PFI Prospectus | SmallCap Value Fund II | Class R-3  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PJARX
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.94%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.33%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.53%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.02%) [61],[62]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.51%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 154
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 481
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 832
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,822
Label rr_AverageAnnualReturnLabel Class R-3 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 19.46%
5 Years rr_AverageAnnualReturnYear05 12.37%
10 Years rr_AverageAnnualReturnYear10 7.37%
PFI Prospectus | SmallCap Value Fund II | Class R-4  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PSTWX
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.94%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.10%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.29%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.34%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.02%) [61],[62]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.32%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 134
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 423
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 732
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,611
Label rr_AverageAnnualReturnLabel Class R-4 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 19.72%
5 Years rr_AverageAnnualReturnYear05 12.60%
10 Years rr_AverageAnnualReturnYear10 7.58%
PFI Prospectus | SmallCap Value Fund II | Class R-5  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PLARX
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.94%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.27%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.22%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.02%) [61],[62]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.20%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 122
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 385
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 668
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,476
Label rr_AverageAnnualReturnLabel Class R-5 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 19.83%
5 Years rr_AverageAnnualReturnYear05 12.73%
10 Years rr_AverageAnnualReturnYear10 7.71%
PFI Prospectus | SmallCap Value Fund II | Class R-6  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PSMVX
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.94%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.01%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.96%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.02%) [61],[62]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.94%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 96
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 304
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 529
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,176
Label rr_AverageAnnualReturnLabel Class R-6 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 20.15%
5 Years rr_AverageAnnualReturnYear05 13.02%
10 Years rr_AverageAnnualReturnYear10 7.96%
PFI Prospectus | Tax-Exempt Bond Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading TAX-EXEMPT BOND FUND
Objective [Heading] rr_ObjectiveHeading Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The Fund seeks to provide a high level of income that is exempt from federal income tax while protecting investors’ capital.
Expense [Heading] rr_ExpenseHeading Fees and Expenses of the Fund
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock
This table describes the fees and expenses that you may pay if you buy, hold, and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $100,000 in Class A Shares of Principal Funds, Inc. More information about these and other discounts is available from your financial intermediary and in “Choosing a Share Class and The Costs of Investing” beginning on page 426 of the Fund’s Prospectus, Appendix B to the Prospectus titled “Intermediary-Specific Sales Charge Waivers and Reductions,” and “Multiple Class Structure” beginning on page 70 of the Fund’s Statement of Additional Information.
If you purchase Institutional Class shares through certain programs offered by certain financial intermediaries, you may be required to pay a commission and/or other forms of compensation to the broker, or to your Financial Professional or other financial intermediary.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder Fees (fees paid directly from your investment)
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination February 28, 2025
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock
The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in Annual Fund Operating Expenses or in the Example, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 36.9% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 36.90%
Expense Breakpoint Discounts [Text] rr_ExpenseBreakpointDiscounts You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $100,000 in Class A Shares of Principal Funds, Inc.
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 100,000
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example assumes conversion of the Class C shares to Class A shares after the eighth year. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. The calculation of costs takes into account any applicable contractual fee waivers and/or expense reimbursements for the period noted in the table above. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, No Redemption, By Year, Caption [Text] rr_ExpenseExampleNoRedemptionByYearCaption With respect to Class C shares, you would pay the following expenses if you did not redeem your shares (all other classes would be the same as in the above example):
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
Under normal circumstances, the Fund invests at least 80% of its net assets, plus any borrowings for investment purposes, in tax-exempt bonds (securities issued by or on behalf of state or local governments and other public authorities) at the time of purchase. Many of these are from California, Illinois, and New York. Generally, municipal obligations pay interest that is exempt from federal income tax. The Fund’s investment in municipal obligations include industrial revenue bonds. The Fund also invests in inverse floating rate obligations (variable rate debt instruments that pay interest at rates that move in the opposite direction of prevailing interest rates), which are generally more volatile than other types of municipal obligations and may involve leverage.
The Fund invests in investment-grade securities and, with respect to up to 20% of its net assets, in below-investment-grade bonds (sometimes called “high yield bonds” or “junk bonds”). Below-investment-grade bonds are rated, at the time of purchase, Ba1 or lower by Moody’s Investors Service, Inc. (“Moody’s”) and BB+ or lower by S&P Global Ratings (“S&P Global”). The Fund’s total investment in below-investment-grade bonds plus investment-grade bonds rated Baa by Moody’s or BBB by S&P Global, at the time of purchase, will not exceed 40% of the Fund’s net assets. If the bond has been rated by only one of the rating agencies, that rating will determine the bond’s rating; if the bond is rated differently by the rating agencies, the highest rating will be used; and if the bond has not been rated by either of the rating agencies, those selecting such investments will determine the bond’s quality.
Under normal circumstances, the Fund maintains an average portfolio duration that is within ±50% of the duration of the Bloomberg Municipal Bond Index, which as of January 31, 2024 was 5.56 years. The Fund is not managed to a particular maturity.
Strategy Portfolio Concentration [Text] rr_StrategyPortfolioConcentration Under normal circumstances, the Fund invests at least 80% of its net assets, plus any borrowings for investment purposes, in tax-exempt bonds (securities issued by or on behalf of state or local governments and other public authorities) at the time of purchase.
Risk [Heading] rr_RiskHeading Principal Risks
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
The following information provides some indication of the risks of investing in the Fund. Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. You may get updated performance information at www.PrincipalAM.com.
The bar chart shows the investment returns of the Fund’s Class A shares for each full calendar year of operations for 10 years (or, if shorter, the life of the Fund). These annual returns do not reflect sales charges on Class A shares; if they did, results would be lower. The table shows for the last one, five, and ten calendar year periods (or, if shorter, the life of the Fund), how the Fund’s average annual total returns compare with those of one or more broad measures of market performance.
For periods prior to the inception date of Institutional Class shares (May 18, 2015), the performance shown in the table for Institutional Class shares is that of the Fund’s Class A shares, adjusted to reflect the fees and expenses of the Institutional Class shares. However, where the adjustment for fees and expenses results in performance for Institutional Class shares that is higher than the historical performance of the Class A shares, the historical performance of the Class A shares is used (without respect to sales charges, which are not applicable to Institutional Class shares). These adjustments result in performance for such periods that is no higher than the historical performance of the Class A shares.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following information provides some indication of the risks of investing in the Fund.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.PrincipalAM.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.
Bar Chart [Heading] rr_BarChartHeading Total Returns as of December 31
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
Highest return for a quarter during the period of the bar chart above:
Q4 20236.34 %
Lowest return for a quarter during the period of the bar chart above:
Q1 2022(7.11)%
Performance Table Heading rr_PerformanceTableHeading Average Annual Total ReturnsFor the periods ended December 31, 2023
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are shown for Class A shares only and would be different for the other share classes.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock
After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. After-tax returns are shown for Class A shares only and would be different for the other share classes.
PFI Prospectus | Tax-Exempt Bond Fund | Risk Lose Money [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Many factors affect that value, and it is possible to lose money by investing in the Fund.
PFI Prospectus | Tax-Exempt Bond Fund | Risk Not Insured Depository Institution [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
PFI Prospectus | Tax-Exempt Bond Fund | Counterparty Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Counterparty Risk. Counterparty risk is the risk that the counterparty to a contract or other obligation will be unable or unwilling to honor its obligations.
PFI Prospectus | Tax-Exempt Bond Fund | Fixed-Income Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Fixed-Income Securities Risk. Fixed-income securities are subject to interest rate, credit quality, and liquidity risks. The market value of fixed-income securities generally declines when interest rates rise, and increased interest rates may adversely affect the liquidity of certain fixed-income securities. Moreover, an issuer of fixed-income securities could default on its payment obligations due to increased interest rates or for other reasons.
PFI Prospectus | Tax-Exempt Bond Fund | Geographic Concentration Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Geographic Concentration Risk. A fund that invests significant portions of its assets in municipal obligations and bonds in particular geographic areas (a particular state, such as California, or a particular country or region) has greater exposure than other funds to economic conditions and developments in those areas.
PFI Prospectus | Tax-Exempt Bond Fund | High Yield Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
High Yield Securities Risk. High yield fixed-income securities (commonly referred to as “junk bonds”) are subject to greater credit quality risk than higher rated fixed-income securities and should be considered speculative.
PFI Prospectus | Tax-Exempt Bond Fund | Industrial Revenue Bond Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Industrial Revenue Bond Risk. The Fund will be sensitive to, and its performance will depend to a greater extent on, the overall condition and performance of industrial revenue bonds. These revenue bonds are issued by or on behalf of public authorities to obtain funds to finance various public and/or privately operated facilities, including those for business and manufacturing, housing, sports, pollution control, airport, mass transit, port, and parking facilities. These bonds are normally secured only by the revenues from the project and not by state or local government tax payments. Consequently, the credit quality of these bonds is dependent upon the ability of the user of the facilities financed by the bonds and any guarantor to meet its financial obligations.
PFI Prospectus | Tax-Exempt Bond Fund | Inverse Floating Rate Investments Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Inverse Floating Rate Investments Risk. Inverse floating rate investments are extremely sensitive to changes in interest rates and, in some cases, their market value may be extremely volatile.
PFI Prospectus | Tax-Exempt Bond Fund | Leverage Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Leverage Risk. Leverage created by borrowing or certain types of transactions or investments may impair the fund’s liquidity, cause it to liquidate positions at an unfavorable time, increase volatility of the fund’s net asset value, or diminish the fund’s performance.
PFI Prospectus | Tax-Exempt Bond Fund | Municipal Obligations Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Municipal Obligations Risk. Principal and interest payments on municipal securities may not be guaranteed by the issuing body and may be payable only from a particular source. That source may not perform as expected, and payment obligations may not be made or made on time.
PFI Prospectus | Tax-Exempt Bond Fund | Portfolio Duration Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Portfolio Duration Risk. Portfolio duration is a measure of the expected life of a fixed-income security and its sensitivity to changes in interest rates. The longer a fund’s average portfolio duration, the more sensitive the fund will be to changes in interest rates, which means funds with longer average portfolio durations may be more volatile than those with shorter durations.
PFI Prospectus | Tax-Exempt Bond Fund | Redemption And Large Transaction Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Redemption and Large Transaction Risk. Ownership of the Fund’s shares may be concentrated in one or a few large investors (such as funds of funds, institutional investors, and asset allocation programs) that may redeem or purchase shares in large quantities. These transactions may cause the Fund to sell securities to meet redemptions or to invest additional cash at times it would not otherwise do so, which may result in increased transaction costs, increased expenses, changes to expense ratios, and adverse effects to Fund performance. Such transactions may also accelerate the realization of taxable income if sales of portfolio securities result in gains. Moreover, reallocations by large shareholders among share classes of a fund may result in changes to the expense ratios of affected classes, which may increase the expenses paid by shareholders of the class that experienced the redemption.
PFI Prospectus | Tax-Exempt Bond Fund | Bloomberg Municipal Bond Index (reflects no deduction for fees, expenses, or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
Label rr_AverageAnnualReturnLabel Bloomberg Municipal Bond Index (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 6.40%
5 Years rr_AverageAnnualReturnYear05 2.25%
10 Years rr_AverageAnnualReturnYear10 3.03%
PFI Prospectus | Tax-Exempt Bond Fund | Class A  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PTEAX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 3.75%
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.40%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Interest Expense (1) rr_Component1OtherExpensesOverAssets 0.12% [63]
Remainder of Other Expenses rr_Component2OtherExpensesOverAssets 0.08%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.20%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.85%
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.85%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 459
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 636
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 829
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,385
Annual Return 2014 rr_AnnualReturn2014 12.01%
Annual Return 2015 rr_AnnualReturn2015 3.84%
Annual Return 2016 rr_AnnualReturn2016 (0.82%)
Annual Return 2017 rr_AnnualReturn2017 6.42%
Annual Return 2018 rr_AnnualReturn2018 0.43%
Annual Return 2019 rr_AnnualReturn2019 8.79%
Annual Return 2020 rr_AnnualReturn2020 4.79%
Annual Return 2021 rr_AnnualReturn2021 2.74%
Annual Return 2022 rr_AnnualReturn2022 (11.77%)
Annual Return 2023 rr_AnnualReturn2023 6.65%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Highest return for a quarter during the period of the bar chart above:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Dec. 31, 2023
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 6.34%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Lowest return for a quarter during the period of the bar chart above:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2022
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (7.11%)
Label rr_AverageAnnualReturnLabel Class A Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 2.60%
5 Years rr_AverageAnnualReturnYear05 1.20%
10 Years rr_AverageAnnualReturnYear10 2.72%
PFI Prospectus | Tax-Exempt Bond Fund | Class A | After Taxes on Distributions  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Class A Return After Taxes on Distributions
1 Year rr_AverageAnnualReturnYear01 2.60%
5 Years rr_AverageAnnualReturnYear05 1.20%
10 Years rr_AverageAnnualReturnYear10 2.72%
PFI Prospectus | Tax-Exempt Bond Fund | Class A | After Taxes on Distributions and Sales  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Class A Return After Taxes on Distributions and Sale of Fund Shares
1 Year rr_AverageAnnualReturnYear01 2.81%
5 Years rr_AverageAnnualReturnYear05 1.54%
10 Years rr_AverageAnnualReturnYear10 2.86%
PFI Prospectus | Tax-Exempt Bond Fund | Class C  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PTBCX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.40%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Interest Expense (1) rr_Component1OtherExpensesOverAssets 0.12% [63]
Remainder of Other Expenses rr_Component2OtherExpensesOverAssets 0.22%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.34%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.74%
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.74%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 277
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 548
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 944
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,816
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 177
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 548
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 944
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,816
Label rr_AverageAnnualReturnLabel Class C Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 4.67%
5 Years rr_AverageAnnualReturnYear05 1.11%
10 Years rr_AverageAnnualReturnYear10 2.46%
PFI Prospectus | Tax-Exempt Bond Fund | Institutional Class  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PITEX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.40%
Interest Expense (1) rr_Component1OtherExpensesOverAssets 0.12% [63]
Remainder of Other Expenses rr_Component2OtherExpensesOverAssets 0.12%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.24%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.64%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.07%) [64]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.57%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 58
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 198
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 350
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 792
Label rr_AverageAnnualReturnLabel Institutional Class Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 6.94%
5 Years rr_AverageAnnualReturnYear05 2.23%
10 Years rr_AverageAnnualReturnYear10 3.35%
[1] Includes interest expense from inverse floaters.
[2] Principal Global Investors, LLC ("PGI"), the investment advisor, has contractually agreed to limit the Fund’s expenses by paying, if necessary, expenses normally payable by the Fund (excluding interest expense, expenses related to fund investments, acquired fund fees and expenses, and tax reclaim recovery expenses and other extraordinary expenses) to maintain a total level of operating expenses (expressed as a percent of average net assets on an annualized basis) not to exceed 0.46% for Institutional Class shares. It is expected that the expense limit will continue through the period ending February 28, 2025; however, Principal Funds, Inc. and PGI, the parties to the agreement, may mutually agree to terminate the expense limit prior to the end of the period. Subject to applicable expense limits, the Fund may reimburse PGI for expenses incurred during the current fiscal year.
[3] Fees have been restated to reflect current fees.
[4] Principal Global Investors, LLC ("PGI"), the investment advisor, has contractually agreed to limit the Fund’s expenses by paying, if necessary, expenses normally payable by the Fund (excluding interest expense, expenses related to fund investments, acquired fund fees and expenses, and tax reclaim recovery expenses and other extraordinary expenses) to maintain a total level of operating expenses (expressed as a percent of average net assets on an annualized basis) not to exceed 0.43% for Institutional Class shares. It is expected that the expense limit will continue through the period ending February 28, 2025; however, Principal Funds, Inc. and PGI, the parties to the agreement, may mutually agree to terminate the expense limit prior to the end of the period. Subject to applicable expense limits, the Fund may reimburse PGI for expenses incurred during the current fiscal year.
[5] Fees have been restated to reflect current fees.
[6] Fees have been restated to reflect current fees.
[7] Principal Global Investors, LLC ("PGI"), the investment advisor, has contractually agreed to limit the Fund’s expenses by paying, if necessary, expenses normally payable by the Fund (excluding interest expense, expenses related to fund investments, acquired fund fees and expenses, and tax reclaim recovery expenses and other extraordinary expenses) to maintain a total level of operating expenses (expressed as a percent of average net assets on an annualized basis) not to exceed 0.68% for Institutional Class shares. In addition, for Class R-6, the expense limit will maintain "Other Expenses" (expressed as a percent of average net assets on an annualized basis) not to exceed 0.02%, (excluding interest expense, expenses related to fund investments, acquired fund fees and expenses, and tax reclaim recovery expenses and other extraordinary expenses). It is expected that the expense limits will continue through the period ending February 28, 2025; however, Principal Funds, Inc. and PGI, the parties to the agreement, may mutually agree to terminate the expense limits prior to the end of the period. Subject to applicable expense limits, the Fund may reimburse PGI for expenses incurred during the current fiscal year.
[8] Includes 0.03% of expenses associated with the reclaim of foreign taxes paid. The expense is not subject to the contractual expense limit.
[9] Principal Global Investors, LLC ("PGI"), the investment advisor, has contractually agreed to limit the Fund’s expenses by paying, if necessary, expenses normally payable by the Fund (excluding interest expense, expenses related to fund investments, acquired fund fees and expenses, and tax reclaim recovery expenses and other extraordinary expenses) to maintain a total level of operating expenses (expressed as a percent of average net assets on an annualized basis) not to exceed 0.85% for Institutional Class shares. It is expected that the expense limit will continue through the period ending February 28, 2025; however, Principal Funds, Inc. and PGI, the parties to the agreement, may mutually agree to terminate the expense limit prior to the end of the period. Subject to applicable expense limits, the Fund may reimburse PGI for expenses incurred during the current fiscal year.
[10] Principal Global Investors, LLC ("PGI"), the investment advisor, has contractually agreed to limit the Fund’s expenses by paying, if necessary, expenses normally payable by the Fund (excluding interest expense, expenses related to fund investments, acquired fund fees and expenses, and tax reclaim recovery expenses and other extraordinary expenses) to maintain a total level of operating expenses (expressed as a percent of average net assets on an annualized basis) not to exceed 0.52% for Institutional Class shares. It is expected that the expense limit will continue through the period ending February 28, 2025; however, Principal Funds, Inc. and PGI, the parties to the agreement, may mutually agree to terminate the expense limit prior to the end of the period. Subject to applicable expense limits, the Fund may reimburse PGI for expenses incurred during the current fiscal year.
[11] Principal Global Investors, LLC ("PGI"), the investment advisor, has contractually agreed to limit the Fund’s expenses by paying, if necessary, expenses normally payable by the Fund (excluding interest expense, expenses related to fund investments, acquired fund fees and expenses, and tax reclaim recovery expenses and other extraordinary expenses) to maintain a total level of operating expenses (expressed as a percent of average net assets on an annualized basis) not to exceed 0.85% for Institutional Class shares. It is expected that the expense limit will continue through the period ending February 28, 2025; however, Principal Funds, Inc. and PGI, the parties to the agreement, may mutually agree to terminate the expense limit prior to the end of the period. Subject to applicable expense limits, the Fund may reimburse PGI for expenses incurred during the current fiscal year.
[12]     Fees have been restated to reflect current fees.
[13] Principal Global Investors, LLC ("PGI"), the investment advisor, has contractually agreed to limit the Fund’s expenses by paying, if necessary, expenses normally payable by the Fund (excluding interest expense, expenses related to fund investments, acquired fund fees and expenses, and tax reclaim recovery expenses and other extraordinary expenses) to maintain a total level of operating expenses (expressed as a percent of average net assets on an annualized basis) not to exceed 1.45% for Class A, 1.30% for Class J and 1.10% for Institutional Class shares. In addition, for Class R-6, the expense limit will maintain "Other Expenses" (expressed as a percent of average net assets on an annualized basis) not to exceed 0.04%, (excluding interest expense, expenses related to fund investments, acquired fund fees and expenses, and tax reclaim recovery expenses and other extraordinary expenses). It is expected that the expense limits will continue through the period ending February 28, 2025; however, Principal Funds, Inc. and PGI, the parties to the agreement, may mutually agree to terminate the expense limits prior to the end of the period. Subject to applicable expense limits, the Fund may reimburse PGI for expenses incurred during the current fiscal year.
[14] During 2019, the Fund experienced a significant one-time gain of approximately $0.11 per share as a result of a settlement in a litigation proceeding. If such gain had not been recognized, the total return amounts shown for periods that include the year ended December 31, 2019 would have been lower.
[15] Principal Global Investors, LLC ("PGI"), the investment advisor, has contractually agreed to limit the Fund’s expenses by paying, if necessary, expenses normally payable by the Fund (excluding interest expense, expenses related to fund investments, acquired fund fees and expenses, and tax reclaim recovery expenses and other extraordinary expenses) to maintain a total level of operating expenses (expressed as a percent of average net assets on an annualized basis) not to exceed 0.94% for Institutional Class shares. It is expected that the expense limit will continue through the period ending February 28, 2025; however, Principal Funds, Inc. and PGI, the parties to the agreement, may mutually agree to terminate the expense limit prior to the end of the period. Subject to applicable expense limits, the Fund may reimburse PGI for expenses incurred during the current fiscal year.
[16] Principal Global Investors, LLC ("PGI"), the investment advisor, has contractually agreed to limit the Fund’s expenses by paying, if necessary, expenses normally payable by the Fund (excluding interest expense, expenses related to fund investments, acquired fund fees and expenses, and tax reclaim recovery expenses and other extraordinary expenses) to maintain a total level of operating expenses (expressed as a percent of average net assets on an annualized basis) not to exceed 0.53% for Institutional Class, 1.29% for Class R-1, 0.98% for Class R-3, 0.79% for Class R-4, and 0.67% for Class R-5 shares. It is expected that the expense limits will continue through the period ending February 28, 2025; however, Principal Funds, Inc. and PGI, the parties to the agreement, may mutually agree to terminate the expense limits prior to the end of the period. Subject to applicable expense limits, the Fund may reimburse PGI for expenses incurred during the current fiscal year.
[17] Principal Global Investors, LLC ("PGI"), the investment advisor, has contractually agreed to limit the Fund's expenses by paying, if necessary, expenses normally payable by the Fund (excluding interest expense, expenses related to fund investments, acquired fund fees and expenses, and tax reclaim recovery expenses and other extraordinary expenses) to maintain a total level of operating expenses (expressed as a percent of average net assets on an annualized basis) not to exceed 0.20% for Institutional Class Shares. In addition, for Class R-6, the expense limit will maintain "Other Expenses" (expressed as a percent of average net assets on an annualized basis) not to exceed 0.00%, (excluding interest expense, expenses related to fund investments, acquired fund fees and expenses, and tax reclaim recovery expenses and other extraordinary expenses). It is expected that the expense limits will continue through the period ending February 28, 2025; however, Principal Funds, Inc. and PGI, the parties to the agreement, may mutually agree to terminate the expense limit prior to the end of the period. Subject to applicable expense limits, the Fund may reimburse PGI for expenses incurred during the current fiscal year.
[18] Principal Global Investors, LLC ("PGI"), the investment advisor, has contractually agreed to reduce the Fund's management fees through the period ending February 28, 2025. The fee waiver will reduce the Fund's management fees in an amount equal to all Acquired Fund Fees and Expenses. It is expected that the fee waiver will continue through the period disclosed; however, Principal Funds, Inc. and PGI, the parties to the agreement, may mutually agree to terminate the fee waiver prior to the end of the period.
[19] Principal Global Investors, LLC ("PGI"), the investment advisor, has contractually agreed to waive a portion of the Fund’s management fees through the period ending February 28, 2025. The fee waiver will reduce the Fund's management fees by 0.015% (expressed as a percent of average net assets on an annualized basis). It is expected that the fee waiver will continue through the period disclosed; however, Principal Funds, Inc. and PGI, the parties to the agreement, may mutually agree to terminate the fee waiver prior to the end of the period.
[20] Principal Global Investors, LLC ("PGI"), the investment advisor, has contractually agreed to limit the Fund’s expenses by paying, if necessary, expenses normally payable by the Fund (excluding interest expense, expenses related to fund investments, acquired fund fees and expenses, and tax reclaim recovery expense and other extraordinary expenses) to maintain a total level of operating expenses (expressed as a percent of average net assets on an annualized basis) not to exceed 0.61% for Institutional Class shares. It is expected that the expense limit will continue through the period ending February 28, 2025; however, Principal Funds, Inc. and PGI, the parties to the agreement, may mutually agree to terminate the expense limit prior to the end of the period. Subject to applicable expense limits, the Fund may reimburse PGI for expenses incurred during the current fiscal year.
[21] Includes 0.13% of expenses associated with the reclaim of foreign taxes paid. The expense is not subject to the contractual expense limit.
[22] Principal Global Investors, LLC ("PGI"), the investment advisor, has contractually agreed to limit the Fund’s expenses by paying, if necessary, expenses normally payable by the Fund (excluding interest expense, expenses related to fund investments, acquired fund fees and expenses, and tax reclaim recovery expenses and other extraordinary expenses) to maintain a total level of operating expenses (expressed as a percent of average net assets on an annualized basis) not to exceed 0.79% for Institutional Class shares. In addition, for Class R-6, the expense limit will maintain "Other Expenses" (expressed as a percent of average net assets on an annualized basis) not to exceed 0.04% (excluding interest expense, expenses related to fund investments, acquired fund fees and expenses, and tax reclaim recovery expenses and other extraordinary expenses). It is expected that the expense limits will continue through the period ending February 28, 2025; however, Principal Funds, Inc. and PGI, the parties to the agreement, may mutually agree to terminate the expense limits prior to the end of the period. Subject to applicable expense limits, the Fund may reimburse PGI for expenses incurred during the current fiscal year.
[23] Principal Global Investors, LLC ("PGI"), the investment advisor, has contractually agreed to waive a portion of the Fund's management fees through the period ending February 28, 2025. The fee waiver will reduce the Fund's management fees by 0.016% (expressed as a percent of average net assets on an annualized basis). It is expected that the fee waiver will continue through the period disclosed; however, Principal Funds, Inc. and PGI, the parties to the agreement may mutually agree to terminate the fee waiver prior to the end of the period.
[24] Fees have been restated to reflect current fees.
[25] Principal Global Investors, LLC ("PGI"), the investment advisor, has contractually agreed to waive a portion of the Fund's management fees through the period ending February 28, 2025. The fee waiver will reduce the Fund's management fees by 0.065% (expressed as a percent of average net assets on an annualized basis). It is expected that the fee waiver will continue through the period disclosed; however, Principal Funds, Inc. and PGI, the parties to the agreement may mutually agree to terminate the fee waiver prior to the end of the period.
[26] Principal Global Investors, LLC ("PGI"), the investment advisor, has contractually agreed to limit the Fund’s expenses by paying, if necessary, expenses normally payable by the Fund (excluding interest expense, expenses related to fund investments, acquired fund fees and expenses, and tax reclaim recovery expenses and other extraordinary expenses) to maintain a total level of operating expenses (expressed as a percent of average net assets on an annualized basis) not to exceed 0.75% for Institutional Class shares. It is expected that the expense limit will continue through the period ending February 28, 2025; however, Principal Funds, Inc. and PGI, the parties to the agreement, may mutually agree to terminate the expense limit prior to the end of the period. Subject to applicable expense limits, the Fund may reimburse PGI for expenses incurred during the current fiscal year.
[27] Principal Global Investors, LLC ("PGI"), the investment advisor, has contractually agreed to waive a portion of the Fund's management fees through the period ending February 28 2025. The fee waiver will reduce the Fund's management fees by 0.02% (expressed as a percent of average net assets on an annualized basis). It is expected that the fee waiver will continue through the period disclosed; however, Principal Funds, Inc. and PGI, the parties to the agreement may mutually agree to terminate the fee waiver prior to the end of the period.
[28] Principal Global Investors, LLC ("PGI"), the investment advisor, has contractually agreed to limit the Fund's expenses by paying, if necessary, expenses normally payable by the Fund (excluding interest expense, expenses related to fund investments, acquired fund fees and expenses, and tax reclaim recovery expenses and other extraordinary expenses) to maintain a total level of operating expenses (expressed as a percent of average net assets on an annualized basis) not to exceed 0.69% for Institutional Class shares. It is expected that the expense limit will continue through the period ending February 28, 2025; however, Principal Funds, Inc. and PGI, the parties to the agreement, may mutually agree to terminate the expense limit prior to the end of the period. Subject to applicable expense limits, the Fund may reimburse PGI for expenses incurred during the current fiscal year.
[29] Principal Global Investors, LLC ("PGI"), the investment advisor, has contractually agreed to waive a portion of the Fund's management fees through the period ending February 28, 2025. The fee waiver will reduce the Fund's management fees by 0.02% (expressed as a percent of average net assets on an annualized basis). It is expected that the fee waiver will continue through the period disclosed; however, Principal Funds, Inc. and PGI, the parties to the agreement may mutually agree to terminate the fee waiver prior to the end of the period.
[30] Principal Funds Distributor, Inc. (the "Distributor") has contractually agreed to limit the Distribution Fees attributable to Class J. The waiver will reduce the Fund's Distribution Fees by 0.15%. It is expected that the fee waiver will continue through the period ending February 28, 2025; however, Principal Funds, Inc. and the Distributor, the parties to the agreement, may mutually agree to terminate the fee waiver prior to the end of the period.
[31] Principal Global Investors, LLC ("PGI"), the investment advisor, has contractually agreed to limit the Fund’s expenses by paying, if necessary, expenses normally payable by the Fund (excluding interest expense, expenses related to fund investments, acquired fund fees and expenses, and tax reclaim recovery expenses and other extraordinary expenses) to maintain a total level of operating expenses (expressed as a percent of average net assets on an annualized basis) not to exceed 0.50% for Class A shares. It is expected that the expense limit will continue through the period ending February 28, 2025; however, Principal Funds, Inc. and PGI, the parties to the agreement, may mutually agree to terminate the expense limit prior to the end of the period. Subject to applicable expense limits, the Fund may reimburse PGI for expenses incurred during the current fiscal year.
[32] Fees have been restated to reflect current fees.
[33] Includes 0.03% of expenses associated with the reclaim of foreign taxes paid.
[34] Principal Global Investors, LLC ("PGI") has contractually agreed to waive a portion of the Fund's management fees through the period ending February 28, 2025. The fee waiver will reduce the Fund's management fees by 0.02% (expressed as a percent of average net assets on an annualized basis). It is expected that the fee waiver will continue through the period disclosed; however, Principal Funds, Inc. and PGI, the parties to the agreement may mutually agree to terminate the fee waiver prior to the end of the period.
[35] Principal Global Investors, LLC ("PGI"), the investment advisor, has contractually agreed to limit the Fund’s expenses by paying, if necessary, expenses normally payable by the Fund (excluding interest expense, expenses related to fund investments, acquired fund fees and expenses, and tax reclaim recovery expenses and other extraordinary expenses) to maintain a total level of operating expenses (expressed as a percent of average net assets on an annualized basis) not to exceed 0.38% for Class A and 0.00% for Institutional Class shares. It is expected that the expense limits will continue through the period ending February 28, 2025; however, Principal Funds, Inc. and PGI, the parties to the agreement, may mutually agree to terminate the expense limits prior to the end of the period. Subject to applicable expense limits, the Fund may reimburse PGI for expenses incurred during the current fiscal year.
[36] Principal Global Investors, LLC ("PGI"), the investment advisor, has contractually agreed to limit the Fund’s expenses by paying, if necessary, expenses normally payable by the Fund (excluding interest expense, expenses related to fund investments, acquired fund fees and expenses, and tax reclaim recovery expenses and other extraordinary expenses) to maintain a total level of operating expenses (expressed as a percent of average net assets on an annualized basis) not to exceed 0.38% for Class A shares. It is expected that the expense limit will continue through the period ending February 28, 2025; however, Principal Funds, Inc. and PGI, the parties to the agreement, may mutually agree to terminate the expense limit prior to the end of the period. Subject to applicable expense limits, the Fund may reimburse PGI for expenses incurred during the current fiscal year.
[37] Principal Global Investors, LLC ("PGI"), the investment advisor, has contractually agreed to limit the Fund’s expenses by paying, if necessary, expenses normally payable by the Fund (excluding interest expense, expenses related to fund investments, acquired fund fees and expenses, and tax reclaim recovery expenses and other extraordinary expenses) to maintain a total level of operating expenses (expressed as a percent of average net assets on an annualized basis) not to exceed 0.38% for Class A shares. It is expected that the expense limit will continue through the period ending February 28, 2025; however, Principal Funds, Inc. and PGI, the parties to the agreement, may mutually agree to terminate the expense limit prior to the end of the period. Subject to applicable expense limits, the Fund may reimburse PGI for expenses incurred during the current fiscal year.
[38] Principal Global Investors, LLC ("PGI"), the investment advisor, has contractually agreed to limit the Fund’s expenses by paying, if necessary, expenses normally payable by the Fund (excluding interest expense, expenses related to fund investments, acquired fund fees and expenses, and tax reclaim recovery expenses and other extraordinary expenses) to maintain a total level of operating expenses (expressed as a percent of average net assets on an annualized basis) not to exceed 0.38% for Class J shares. It is expected that the expense limit will continue through the period ending February 28, 2025; however, Principal Funds, Inc. and PGI, the parties to the agreement, may mutually agree to terminate the expense limit prior to the end of the period. Subject to applicable expense limits, the Fund may reimburse PGI for expenses incurred during the current fiscal year.
[39] Principal Global Investors, LLC ("PGI"), the investment advisor, has contractually agreed to limit the Fund's expenses by paying, if necessary, expenses normally payable by the Fund (excluding interest expense, expenses related to fund investments, acquired fund fees and expenses, and tax reclaim recovery expenses and other extraordinary expenses) to maintain a total level of operating expenses (expressed as a percent of average net assets on an annualized basis) not to exceed 0.30% for Class J, 0.05% for Institutional Class, 0.93% for Class R-1, 0.62% for Class R-3, 0.43% for Class R-4 and 0.31% for Class R-5 shares. It is expected that the expense limits will continue through the period ending February 28, 2025; however, Principal Funds, Inc. and PGI, the parties to the agreement, may mutually agree to terminate the expense limits prior to the end of the period. Subject to applicable expense limits, the Fund may reimburse PGI for expenses incurred during the current fiscal year.
[40] Principal Global Investors, LLC ("PGI"), the investment advisor, has contractually agreed to limit the Fund’s expenses by paying, if necessary, expenses normally payable by the Fund (excluding interest expense, expenses related to fund investments, acquired fund fees and expenses, and tax reclaim recovery expenses and other extraordinary expenses) to maintain a total level of operating expenses (expressed as a percent of average net assets on an annualized basis) not to exceed 0.05% for Institutional Class shares. In addition, for Class R-6 shares, the expense limit will maintain "Other Expenses" (expressed as a percent of average net assets on an annualized basis) not to exceed 0.02%, (excluding interest expense, expenses related to fund investments, acquired fund fees and expenses, and tax reclaim recovery expenses and other extraordinary expenses). It is expected that the expense limits will continue through the period ending February 28, 2025; however, Principal Funds, Inc. and PGI, the parties to the agreement, may mutually agree to terminate the expense limits prior to the end of the period. Subject to applicable expense limits, the Fund may reimburse PGI for expenses incurred during the current fiscal year.
[41] Principal Global Investors, LLC ("PGI"), the investment advisor, has contractually agreed to limit the Fund’s expenses by paying, if necessary, expenses normally payable by the Fund (excluding interest expense, expenses related to fund investments, acquired fund fees and expenses, and tax reclaim recovery expenses and other extraordinary expenses) to maintain a total level of operating expenses (expressed as a percent of average net assets on an annualized basis) not to exceed 0.05% for Institutional Class shares. In addition, for Class R-6 shares, the expense limit will maintain "Other Expenses" (expressed as a percent of average net assets on an annualized basis) not to exceed 0.02%, (excluding interest expense, expenses related to fund investments, acquired fund fees and expenses, and tax reclaim recovery expenses and other extraordinary expenses). It is expected that the expense limits will continue through the period ending February 28, 2025; however, Principal Funds, Inc. and PGI, the parties to the agreement, may mutually agree to terminate the expense limits prior to the end of the period. Subject to applicable expense limits, the Fund may reimburse PGI for expenses incurred during the current fiscal year.
[42] Principal Global Investors, LLC ("PGI"), the investment advisor, has contractually agreed to limit the Fund’s expenses by paying, if necessary, expenses normally payable by the Fund (excluding interest expense, expenses related to fund investments, acquired fund fees and expenses, and tax reclaim recovery expenses and other extraordinary expenses) to maintain a total level of operating expenses (expressed as a percent of average net assets on an annualized basis) not to exceed 0.05% for Institutional Class shares. In addition, for Class R-6 shares, the expense limit will maintain "Other Expenses" (expressed as a percent of average net assets on an annualized basis) not to exceed 0.02%, (excluding interest expense, expenses related to fund investments, acquired fund fees and expenses, and tax reclaim recovery expenses and other extraordinary expenses). It is expected that the expense limits will continue through the period ending February 28, 2025; however, Principal Funds, Inc. and PGI, the parties to the agreement, may mutually agree to terminate the expense limits prior to the end of the period. Subject to applicable expense limits, the Fund may reimburse PGI for expenses incurred during the current fiscal year.
[43] Principal Global Investors, LLC ("PGI"), the investment advisor, has contractually agreed to limit the Fund’s expenses by paying, if necessary, expenses normally payable by the Fund (excluding interest expense, expenses related to fund investments, acquired fund fees and expenses, and tax reclaim recovery expenses and other extraordinary expenses) to maintain a total level of operating expenses (expressed as a percent of average net assets on an annualized basis) not to exceed 0.05% for Institutional Class shares. In addition, for Class R-6 shares, the expense limit will maintain "Other Expenses" (expressed as a percent of average net assets on an annualized basis) not to exceed 0.02%, (excluding interest expense, expenses related to fund investments, acquired fund fees and expenses, and tax reclaim recovery expenses and other extraordinary expenses). It is expected that the expense limits will continue through the period ending February 28, 2025; however, Principal Funds, Inc. and PGI, the parties to the agreement, may mutually agree to terminate the expense limits prior to the end of the period. Subject to applicable expense limits, the Fund may reimburse PGI for expenses incurred during the current fiscal year.
[44] Principal Global Investors, LLC ("PGI"), the investment advisor, has contractually agreed to limit the Fund’s expenses by paying, if necessary, expenses normally payable by the Fund (excluding interest expense, expenses related to fund investments, acquired fund fees and expenses, and tax reclaim recovery expenses and other extraordinary expenses) to maintain a total level of operating expenses (expressed as a percent of average net assets on an annualized basis) not to exceed 0.05% for Institutional Class shares. In addition, for Class R-6 shares, the expense limit will maintain "Other Expenses" (expressed as a percent of average net assets on an annualized basis) not to exceed 0.02%, (excluding interest expense, expenses related to fund investments, acquired fund fees and expenses, and tax reclaim recovery expenses and other extraordinary expenses). It is expected that the expense limits will continue through the period ending February 28, 2025; however, Principal Funds, Inc. and PGI, the parties to the agreement, may mutually agree to terminate the expense limits prior to the end of the period. Subject to applicable expense limits, the Fund may reimburse PGI for expenses incurred during the current fiscal year.
[45] Principal Global Investors, LLC ("PGI"), the investment advisor, has contractually agreed to limit the Fund’s expenses by paying, if necessary, expenses normally payable by the Fund (excluding interest expense, expenses related to fund investments, acquired fund fees and expenses, and tax reclaim recovery expenses and other extraordinary expenses) to maintain a total level of operating expenses (expressed as a percent of average net assets on an annualized basis) not to exceed 0.05% for Institutional Class shares. In addition, for Class R-6 shares, the expense limit will maintain "Other Expenses" (expressed as a percent of average net assets on an annualized basis) not to exceed 0.02%, (excluding interest expense, expenses related to fund investments, acquired fund fees and expenses, and tax reclaim recovery expenses and other extraordinary expenses). It is expected that the expense limits will continue through the period ending February 28, 2025; however, Principal Funds, Inc. and PGI, the parties to the agreement, may mutually agree to terminate the expense limits prior to the end of the period. Subject to applicable expense limits, the Fund may reimburse PGI for expenses incurred during the current fiscal year.
[46] Principal Global Investors, LLC ("PGI"), the investment advisor, has contractually agreed to limit the Fund’s expenses by paying, if necessary, expenses normally payable by the Fund (excluding interest expense, expenses related to fund investments, acquired fund fees and expenses, and tax reclaim recovery expenses and other extraordinary expenses) to maintain a total level of operating expenses (expressed as a percent of average net assets on an annualized basis) not to exceed 0.05% for Institutional Class shares. In addition, for Class R-6 shares, the expense limit will maintain "Other Expenses" (expressed as a percent of average net assets on an annualized basis) not to exceed 0.02%, (excluding interest expense, expenses related to fund investments, acquired fund fees and expenses, and tax reclaim recovery expenses and other extraordinary expenses). It is expected that the expense limits will continue through the period ending February 28, 2025; however, Principal Funds, Inc. and PGI, the parties to the agreement, may mutually agree to terminate the expense limits prior to the end of the period. Subject to applicable expense limits, the Fund may reimburse PGI for expenses incurred during the current fiscal year.
[47] Principal Global Investors, LLC ("PGI"), the investment advisor, has contractually agreed to limit the Fund’s expenses by paying, if necessary, expenses normally payable by the Fund (excluding interest expense, expenses related to fund investments, acquired fund fees and expenses, and tax reclaim recovery expenses and other extraordinary expenses) to maintain a total level of operating expenses (expressed as a percent of average net assets on an annualized basis) not to exceed 0.05% for Institutional Class shares. In addition, for Class R-6 shares, the expense limit will maintain "Other Expenses" (expressed as a percent of average net assets on an annualized basis) not to exceed 0.02%, (excluding interest expense, expenses related to fund investments, acquired fund fees and expenses, and tax reclaim recovery expenses and other extraordinary expenses). It is expected that the expense limits will continue through the period ending February 28, 2025; however, Principal Funds, Inc. and PGI, the parties to the agreement, may mutually agree to terminate the expense limits prior to the end of the period. Subject to applicable expense limits, the Fund may reimburse PGI for expenses incurred during the current fiscal year.
[48] Principal Global Investors, LLC ("PGI"), the investment advisor, has contractually agreed to limit the Fund’s expenses by paying, if necessary, expenses normally payable by the Fund (excluding interest expense, expenses related to fund investments, acquired fund fees and expenses, and tax reclaim recovery expenses and other extraordinary expenses) to maintain a total level of operating expenses (expressed as a percent of average net assets on an annualized basis) not to exceed 0.05% for Institutional Class shares. In addition, for Class R-6 shares, the expense limit will maintain "Other Expenses" (expressed as a percent of average net assets on an annualized basis) not to exceed 0.02%, (excluding interest expense, expenses related to fund investments, acquired fund fees and expenses, and tax reclaim recovery expenses and other extraordinary expenses). It is expected that the expense limits will continue through the period ending February 28, 2025; however, Principal Funds, Inc. and PGI, the parties to the agreement, may mutually agree to terminate the expense limits prior to the end of the period. Subject to applicable expense limits, the Fund may reimburse PGI for expenses incurred during the current fiscal year.
[49] Principal Global Investors, LLC ("PGI"), the investment advisor, has contractually agreed to limit the Fund’s expenses by paying, if necessary, expenses normally payable by the Fund (excluding interest expense, expenses related to fund investments, acquired fund fees and expenses, and tax reclaim recovery expenses and other extraordinary expenses) to maintain a total level of operating expenses (expressed as a percent of average net assets on an annualized basis) not to exceed 0.30% for Class J and 0.05% for Institutional Class shares. In addition, for Class R-6 shares, the expense limit will maintain "Other Expenses" (expressed as a percent of average net assets on an annualized basis) not to exceed 0.02%, (excluding interest expense, expenses related to fund investments, acquired fund fees and expenses, and tax reclaim recovery expenses and other extraordinary expenses). It is expected that the expense limits will continue through the period ending February 28, 2025; however, Principal Funds, Inc. and PGI, the parties to the agreement, may mutually agree to terminate the expense limits prior to the end of the period. Subject to applicable expense limits, the Fund may reimburse PGI for expenses incurred during the current fiscal year.
[50] Principal Global Investors, LLC ("PGI"), the investment advisor, has contractually agreed to limit the Fund’s expenses by paying, if necessary, expenses normally payable by the Fund (excluding interest expense, expenses related to fund investments, acquired fund fees and expenses, and tax reclaim recovery expenses and other extraordinary expenses) to maintain a total level of operating expenses (expressed as a percent of average net assets on an annualized basis) not to exceed 0.30% for Class J and 0.05% for Institutional Class shares. In addition, for Class R-6 shares, the expense limit will maintain "Other Expenses" (expressed as a percent of average net assets on an annualized basis) not to exceed 0.02%, (excluding interest expense, expenses related to fund investments, acquired fund fees and expenses, and tax reclaim recovery expenses and other extraordinary expenses). It is expected that the expense limits will continue through the period ending February 28, 2025; however, Principal Funds, Inc. and PGI, the parties to the agreement, may mutually agree to terminate the expense limits prior to the end of the period. Subject to applicable expense limits, the Fund may reimburse PGI for expenses incurred during the current fiscal year.
[51] Principal Global Investors, LLC ("PGI"), the investment advisor, has contractually agreed to limit the Fund’s expenses by paying, if necessary, expenses normally payable by the Fund (excluding interest expense, expenses related to fund investments, acquired fund fees and expenses, and tax reclaim recovery expenses and other extraordinary expenses) to maintain a total level of operating expenses (expressed as a percent of average net assets on an annualized basis) not to exceed 0.30% for Class J and 0.05% for Institutional Class shares. In addition, for Class R-6 shares, the expense limit will maintain "Other Expenses" (expressed as a percent of average net assets on an annualized basis) not to exceed 0.02%, (excluding interest expense, expenses related to fund investments, acquired fund fees and expenses, and tax reclaim recovery expenses and other extraordinary expenses). It is expected that the expense limits will continue through the period ending February 28, 2025; however, Principal Funds, Inc. and PGI, the parties to the agreement, may mutually agree to terminate the expense limits prior to the end of the period. Subject to applicable expense limits, the Fund may reimburse PGI for expenses incurred during the current fiscal year.
[52] During 2018, Class R-6 experienced a one-time loss of approximately $0.33 per share as a result of a large redemption. If such loss had not been recognized, the total return amounts expressed herein would have been higher.
[53] During May of 2019, Class R-6 experienced a one-time gain of approximately $0.35 per share as a result of a reimbursement by PGI, the investment advisor. If such gain had not been recognized, the total return amounts expressed herein would have been lower.
[54] Principal Global Investors, LLC ("PGI"), the investment advisor, has contractually agreed to limit the Fund’s expenses by paying, if necessary, expenses normally payable by the Fund (excluding interest expense, expenses related to fund investments, acquired fund fees and expenses, and tax reclaim recovery expenses and other extraordinary expenses) to maintain a total level of operating expenses (expressed as a percent of average net assets on an annualized basis) not to exceed 0.30% for Class J and 0.05% for Institutional Class shares. In addition, for Class R-6 shares, the expense limit will maintain "Other Expenses" (expressed as a percent of average net assets on an annualized basis) not to exceed 0.02%, (excluding interest expense, expenses related to fund investments, acquired fund fees and expenses, and tax reclaim recovery expenses and other extraordinary expenses). It is expected that the expense limits will continue through the period ending February 28, 2025; however, Principal Funds, Inc. and PGI, the parties to the agreement, may mutually agree to terminate the expense limits prior to the end of the period. Subject to applicable expense limits, the Fund may reimburse PGI for expenses incurred during the current fiscal year.
[55] Principal Global Investors, LLC ("PGI"), the investment advisor, has contractually agreed to limit the Fund’s expenses by paying, if necessary, expenses normally payable by the Fund (excluding interest expense, expenses related to fund investments, acquired fund fees and expenses, and tax reclaim recovery expenses and other extraordinary expenses) to maintain a total level of operating expenses (expressed as a percent of average net assets on an annualized basis) not to exceed 0.86% for Institutional Class shares. It is expected that the expense limit will continue through the period ending February 28, 2025; however, Principal Funds, Inc. and PGI, the parties to the agreement, may mutually agree to terminate the expense limit prior to the end of the period. Subject to applicable expense limits, the Fund may reimburse PGI for expenses incurred during the current fiscal year.
[56] Fees have been restated to reflect current fees.
[57] Principal Global Investors, LLC ("PGI"), the investment advisor, has contractually agreed to limit the Fund’s expenses by paying, if necessary, expenses normally payable by the Fund (excluding interest expense, expenses related to fund investments, acquired fund fees and expenses, and tax reclaim recovery expenses and other extraordinary expenses) to maintain a total level of operating expenses (expressed as a percent of average net assets on an annualized basis) not to exceed 0.85% for Institutional Class shares. In addition, for Class R-6, the expense limit will maintain "Other Expenses" (expressed as a percent of average net assets on an annualized basis) not to exceed 0.02%, (excluding interest expense, expenses related to fund investments, acquired fund fees and expenses, and tax reclaim recovery expenses and other extraordinary expenses). It is expected that the expense limits will continue through the period ending February 28, 2025; however, Principal Funds, Inc. and PGI, the parties to the agreement, may mutually agree to terminate the expense limits prior to the end of the period. Subject to applicable expense limits, the Fund may reimburse PGI for expenses incurred during the current fiscal year.
[58] Principal Global Investors, LLC ("PGI"), the investment advisor, has contractually agreed to waive a portion of the Fund's management fees through the period ending February 28, 2025. The fee waiver will reduce the Fund's management fees by 0.02% (expressed as a percent of average net assets on an annualized basis). It is expected that the fee waiver will continue through the period disclosed; however, Principal Funds, Inc. and PGI, the parties to the agreement may mutually agree to terminate the fee waiver prior to the end of the period.
[59] Principal Global Investors, LLC ("PGI"), the investment advisor, has contractually agreed to limit the Fund’s expenses by paying, if necessary, expenses normally payable by the Fund (excluding interest expense, expenses related to fund investments, acquired fund fees and expenses, and tax reclaim recovery expenses and other extraordinary expenses) to maintain "Other Expenses" (expressed as a percent of average net assets on an annualized basis) not to exceed 0.01% for Class R-6 shares. It is expected that the expense limit will continue through the period ending February 28, 2025; however, Principal Funds, Inc. and PGI, the parties to the agreement, may mutually agree to terminate the expense limit prior to the end of the period. Subject to applicable expense limits, the Fund may reimburse PGI for expenses incurred during the current fiscal
[60] Principal Global Investors, LLC ("PGI"), the investment advisor, has contractually agreed to limit the Fund’s expenses by paying, if necessary, expenses normally payable by the Fund (excluding interest expense, expenses related to fund investments, acquired fund fees and expenses, and tax reclaim recovery expenses and other extraordinary expenses) to maintain a total level of operating expenses (expressed as a percent of average net assets on an annualized basis) not to exceed 0.21% for Institutional Class shares. It is expected that the expense limit will continue through the period ending February 28, 2025; however, Principal Funds, Inc. and PGI, the parties to the agreement, may mutually agree to terminate the expense limit prior to the end of the period. Subject to applicable expense limits, the Fund may reimburse PGI for expenses incurred during the current fiscal year.
[61] Principal Global Investors, LLC ("PGI"), the investment advisor, has contractually agreed to limit the Fund’s expenses by paying, if necessary, expenses normally payable by the Fund (excluding interest expense, expenses related to fund investments, acquired fund fees and expenses, and tax reclaim recovery expenses and other extraordinary expenses) to maintain a total level of operating expenses (expressed as a percent of average net assets on an annualized basis) not to exceed 0.96% for Institutional Class shares. It is expected that the expense limit will continue through the period ending February 28, 2025; however, Principal Funds, Inc. and PGI, the parties to the agreement, may mutually agree to terminate the expense limit prior to the end of the period. Subject to applicable expense limits, the Fund may reimburse PGI for expenses incurred during the current fiscal year.
[62] Principal Global Investors, LLC ("PGI"), the investment advisor, has contractually agreed to waive a portion of the Fund's management fees through the period ending February 28, 2025. The fee waiver will reduce the Fund's management fees by 0.02% (expressed as a percent of average net assets on an annualized basis). It is expected that the fee waiver will continue through the period disclosed; however, Principal Funds, Inc. and PGI, the parties to the agreement may mutually agree to terminate the fee waiver prior to the end of the period.
[63] Includes interest expense from inverse floaters.
[64] Principal Global Investors, LLC ("PGI"), the investment advisor, has contractually agreed to limit the Fund’s expenses by paying, if necessary, expenses normally payable by the Fund (excluding interest expense, expenses related to fund investments, acquired fund fees and expenses, and tax reclaim recovery expenses and other extraordinary expenses) to maintain a total level of operating expenses (expressed as a percent of average net assets on an annualized basis) not to exceed 0.45% for Institutional Class shares. It is expected that the expense limit will continue through the period ending February 28, 2025; however, Principal Funds, Inc. and PGI, the parties to the agreement, may mutually agree to terminate the expense limit prior to the end of the period. Subject to applicable expense limits, the Fund may reimburse PGI for expenses incurred during the current fiscal year.