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Risk Return Abstract rr_RiskReturnAbstract  
Registrant Name dei_EntityRegistrantName PRINCIPAL FUNDS, INC.
Prospectus Date rr_ProspectusDate Dec. 31, 2022
Opportunistic Municipal Fund  
Risk Return Abstract rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading <span style="color:#000000;font-family:Arial;font-size:12pt;font-weight:bold;text-transform:uppercase;">Opportunistic Municipal Fund</span>
Objective [Heading] rr_ObjectiveHeading <span style="color:#000000;font-family:Arial;font-size:10pt;font-weight:bold;">Objective</span>
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 <span style="color:#000000;font-family:Arial;font-size:10pt;font-weight:bold;">Fees and Expenses of the Fund</span>
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 117 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 4 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 <span style="color:#000000;font-family:Arial;font-size:10pt;font-weight:bold;">Shareholder Fees (fees paid directly from your investment)</span>
Operating Expenses Caption [Text] rr_OperatingExpensesCaption <span style="color:#000000;font-family:Arial;font-size:10pt;font-weight:bold;">Annual Fund Operating Expenses</span> <br/><span style="color:#000000;font-family:Arial;font-size:10pt;font-weight:bold;margin-left:0%;">(expenses that you pay each year as a percentage of the value of your investment)</span>
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination <span style="font-family:Arial;font-size:8pt;">December 30, </span><span style="font-family:Arial;font-size:8pt;">2023</span>
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading <span style="color:#000000;font-family:Arial;font-size:10pt;font-weight:bold;">Portfolio Turnover</span>
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 52.4% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 52.40%
Expense Breakpoint Discounts [Text] rr_ExpenseBreakpointDiscounts <span style="font-family:Arial;font-size:10pt;">You may qualify for sales charge discounts if you and your family invest, or agree to invest in the </span><span style="font-family:Arial;font-size:10pt;">future, at least $</span><span style="font-family:Arial;font-size:10pt;">100,000</span><span style="font-family:Arial;font-size:10pt;"> in Class A shares of Principal Funds, Inc.</span>
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 100,000
Expenses Restated to Reflect Current [Text] rr_ExpensesRestatedToReflectCurrent <span style="font-family:Arial;font-size:8pt;">Fees have been restated to</span><span style="font-family:Arial;font-size:8pt;line-height:10pt;"> </span><span style="font-family:Arial;font-size:8pt;">reflect current</span><span style="font-family:Arial;font-size:8pt;line-height:10pt;"> </span><span style="font-family:Arial;font-size:8pt;">fees.</span>
Expense Example [Heading] rr_ExpenseExampleHeading <span style="color:#000000;font-family:Arial;font-size:10pt;font-weight:bold;">Example</span>
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. 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 <span style="color:#000000;font-family:Arial;font-size:10pt;font-weight:bold;">Principal Investment Strategies</span>
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 municipal obligations, which are securities issued by or on behalf of state or local governments and other public authorities. Municipal obligations generally pay interest that is exempt from federal income tax. The Fund’s investment in municipal obligations include industrial revenue bonds. The Fund has a flexible investment strategy and invests in obligations of any duration and credit quality, including 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 those agencies, that rating will determine whether the bond is below investment grade; if the bond has not been rated by either of those agencies, those selecting such investments will determine whether the bond is of a quality comparable to those rated below investment grade). The Fund is not managed to a particular maturity or duration.The Fund invests in other debt obligations, including (but not limited to) taxable municipal obligations; U.S. Treasury securities;obligations of the U.S. government, its agencies, and instrumentalities; and exchange-traded funds (ETFs) to gain exposure to the municipal market.The Fund uses derivative instruments, such as futures, for duration management purposes. A derivative is a financial arrangement, the value of which is derived from, or based on, a traditional security, asset, or market index. The Fund also invests in inverse floating rate instruments, which are generally more volatile than other types of municipal obligations and may involve leverage, to enhance investment income.
Risk [Heading] rr_RiskHeading <span style="color:#000000;font-family:Arial;font-size:10pt;font-weight:bold;">Principal Risks</span>
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock The value of your investment in the Fund changes with the value of the Fund’s investments. Many factors affect that value, and it is possible to lose money by investing in the Fund. 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. The principal risks of investing in the Fund are listed below in alphabetical order and not in order of significance.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.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.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.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.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.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.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.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.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.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.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.U.S. Government Securities Risk.  Yields available from U.S. government securities are generally lower than yields from many other fixed-income securities.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.
Risk Lose Money [Text] rr_RiskLoseMoney <span style="color:#000000;font-family:Arial;font-size:10pt;">Many factors affect that value, and it is possible to lose money by investing in the Fund.</span>
Risk Not Insured Depository Institution [Text] rr_RiskNotInsuredDepositoryInstitution <span style="color:#000000;font-family:Arial;font-size:10pt;"> An investment in the Fund is not a deposit of a bank and is not </span><span style="color:#000000;font-family:Arial;font-size:10pt;">insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.</span>
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading <span style="color:#000000;font-family:Arial;font-size:10pt;font-weight:bold;">Performance</span>
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.Life of Fund returns are measured from the date the Fund’s shares were first sold (June 14, 2012).For periods prior to the inception date of Institutional Class shares (March 10, 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 this adjustment for fees and expenses results in performance for the Institutional Class 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 does not apply to Institutional Class). These adjustments result in performance for such periods that is no higher than the historical performance of the Class A shares, which were first sold June 14, 2012.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns <span style="color:#000000;font-family:Arial;font-size:10pt;margin-left:0%;">The bar chart shows the investment returns of the Fund’s Class A shares for each full calendar year of operations for 10 </span><span style="color:#000000;font-family:Arial;font-size:10pt;">years (or, if shorter, the life of the Fund). </span><span style="color:#000000;font-family:Arial;font-size:10pt;">These annual returns do not reflect sales charges on Class A shares; if they did, </span><span style="color:#000000;font-family:Arial;font-size:10pt;">results would be lower.</span><span style="color:#000000;font-family:Arial;font-size:10pt;"> The table shows for the last one, five, and ten calendar year periods (or, if shorter, the life of the </span><span style="color:#000000;font-family:Arial;font-size:10pt;">Fund), how the Fund’s average annual total returns compare with those of one or more broad measures of market performance.</span>
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress <span style="font-family:Arial;font-size:10pt;">www.</span><span style="font-family:Arial;font-size:10pt;">PrincipalAM.com</span>
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture <span style="font-family:Arial;font-size:10pt;">Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.</span>
Bar Chart [Heading] rr_BarChartHeading <span style="font-family:Arial;font-size:10pt;font-weight:bold;">Total Returns as of December 31</span>
Bar Chart Does Not Reflect Sales Loads [Text] rr_BarChartDoesNotReflectSalesLoads <span style="color:#000000;font-family:Arial;font-size:10pt;">These annual returns do not reflect sales charges on Class A shares; if they did, </span><span style="color:#000000;font-family:Arial;font-size:10pt;">results would be lower.</span>
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock Highest return for a quarter during the period of the bar chart above:Q1 20146.17%Lowest return for a quarter during the period of the bar chart above:Q1 2020(7.70)%Year-to-date return for Class A shares:Q3 2022(18.24)%
Performance Table Heading rr_PerformanceTableHeading <span style="font-family:Arial;font-size:10pt;font-weight:bold;">Average Annual Total Returns</span> <br/><span style="font-family:Arial;font-size:10pt;font-weight:bold;margin-left:0%;">For the periods ended December 31, </span><span style="font-family:Arial;font-size:10pt;font-weight:bold;">2021</span>
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate <span style="color:#000000;font-family:Arial;font-size:10pt;margin-left:0%;">After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect </span><span style="color:#000000;font-family:Arial;font-size:10pt;">the impact of state and local taxes.</span>
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred <span style="color:#000000;font-family:Arial;font-size:10pt;"> Actual after-tax returns depend on an investor’s tax situation and may differ from those </span><span style="color:#000000;font-family:Arial;font-size:10pt;">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.</span>
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown <span style="color:#000000;font-family:Arial;font-size:10pt;"> After-tax returns are shown for Class A shares only </span><span style="color:#000000;font-family:Arial;font-size:10pt;">and would be different for the other share classes.</span>
Performance Table Narrative rr_PerformanceTableNarrativeTextBlock 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.
Opportunistic Municipal Fund | Class A  
Risk Return Abstract rr_RiskReturnAbstract  
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 3.75%
Maximum Deferred Sales Charge (Load) (as a percentage of the offering price or NAV at the time Sales Load is paid, whichever is less) rr_MaximumDeferredSalesChargeOverOther 1.00%
Management Fees rr_ManagementFeesOverAssets 0.44% [1]
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Interest Expenses rr_Component1OtherExpensesOverAssets 0.06%
Remainder of Other Expenses rr_Component3OtherExpensesOverAssets 0.17%
Total Other Expenses rr_OtherExpensesOverAssets 0.23%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.92%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.02%) [2]
Total Annual Fund Operating Expenses after Fee Waiver and Expense Reimbursement rr_NetExpensesOverAssets 0.90%
1 year rr_ExpenseExampleYear01 $ 463
3 years rr_ExpenseExampleYear03 655
5 years rr_ExpenseExampleYear05 863
10 years rr_ExpenseExampleYear10 $ 1,462
2013 rr_AnnualReturn2013 (7.76%)
2014 rr_AnnualReturn2014 16.17%
2015 rr_AnnualReturn2015 6.29%
2016 rr_AnnualReturn2016 (0.30%)
2017 rr_AnnualReturn2017 10.13%
2018 rr_AnnualReturn2018 1.33%
2019 rr_AnnualReturn2019 10.59%
2020 rr_AnnualReturn2020 4.38%
2021 rr_AnnualReturn2021 6.37%
Year to Date Return, Label rr_YearToDateReturnLabel <span style="font-family:Arial;font-size:8pt;font-weight:bold;margin-left:0.0pt;">Year-to-date return for Class A shares:</span>
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Sep. 30, 2022
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn (18.24%)
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel <span style="font-family:Arial;font-size:8pt;font-weight:bold;margin-left:0.0pt;">Highest return for a quarter during the period of the bar chart above:</span>
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Mar. 31, 2014
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 6.17%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel <span style="font-family:Arial;font-size:8pt;font-weight:bold;margin-left:0.0pt;">Lowest return for a quarter during the period of the bar chart above:</span>
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (7.70%)
1 Year rr_AverageAnnualReturnYear01 2.37%
5 Years rr_AverageAnnualReturnYear05 5.70%
Life of Fund rr_AverageAnnualReturnSinceInception 5.03%
Inception Date rr_AverageAnnualReturnInceptionDate Jun. 14, 2012
Opportunistic Municipal Fund | Institutional Class  
Risk Return Abstract rr_RiskReturnAbstract  
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (Load) (as a percentage of the offering price or NAV at the time Sales Load is paid, whichever is less) rr_MaximumDeferredSalesChargeOverOther none
Management Fees rr_ManagementFeesOverAssets 0.44% [1]
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets
Interest Expenses rr_Component1OtherExpensesOverAssets 0.06%
Remainder of Other Expenses rr_Component3OtherExpensesOverAssets 0.16%
Total Other Expenses rr_OtherExpensesOverAssets 0.22%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.66%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.04%) [2]
Total Annual Fund Operating Expenses after Fee Waiver and Expense Reimbursement rr_NetExpensesOverAssets 0.62%
1 year rr_ExpenseExampleYear01 $ 63
3 years rr_ExpenseExampleYear03 207
5 years rr_ExpenseExampleYear05 364
10 years rr_ExpenseExampleYear10 $ 819
1 Year rr_AverageAnnualReturnYear01 6.76%
5 Years rr_AverageAnnualReturnYear05 6.83%
Life of Fund rr_AverageAnnualReturnSinceInception 5.65%
Opportunistic Municipal Fund | Return After Taxes on Distributions | Class A  
Risk Return Abstract rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 2.37%
5 Years rr_AverageAnnualReturnYear05 5.70%
Life of Fund rr_AverageAnnualReturnSinceInception 5.02%
Opportunistic Municipal Fund | Return After Taxes on Distributions and Sale of Fund Shares | Class A  
Risk Return Abstract rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 2.68%
5 Years rr_AverageAnnualReturnYear05 5.24%
Life of Fund rr_AverageAnnualReturnSinceInception 4.75%
Opportunistic Municipal Fund | Bloomberg Municipal Bond Index (reflects no deduction for fees, expenses, or taxes)  
Risk Return Abstract rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 1.52%
5 Years rr_AverageAnnualReturnYear05 4.17%
Life of Fund rr_AverageAnnualReturnSinceInception 3.53%
[1] Fees have been restated to reflect current fees.
[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 0.84% for Class A and 0.56% for Institutional Class shares. It is expected that the expense limits will continue through the period ending December 30, 2023; 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.