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Label Element Value
Prospectus: rr_ProspectusTable  
Document Type dei_DocumentType 497
Document Period End Date dei_DocumentPeriodEndDate Aug. 31, 2019
Entity Registrant Name dei_EntityRegistrantName PRINCIPAL FUNDS INC
Central Index Key dei_EntityCentralIndexKey 0000898745
Amendment Flag dei_AmendmentFlag false
Document Creation Date dei_DocumentCreationDate Mar. 13, 2020
Document Effective Date dei_DocumentEffectiveDate Mar. 13, 2020
Prospectus Date rr_ProspectusDate Dec. 31, 2019
Diversified Real Asset Fund  
Prospectus: rr_ProspectusTable  
Supplement [Text Block] ck0000898745_SupplementTextBlock
Principal Funds, Inc.
Supplement dated March 13, 2020
to the Statutory Prospectus dated December 31, 2019
(as previously supplemented)
This supplement updates information currently in the Statutory Prospectus. Please retain this supplement for future reference.
Principal Funds Inc | Diversified Real Asset Fund  
Prospectus: rr_ProspectusTable  
Risk/Return [Heading] rr_RiskReturnHeading SUMMARY FOR DIVERSIFIED REAL ASSET FUND
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Effective April 1, 2020, delete the Annual Fund Operating Expenses table and footnotes, and replace with the following: Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Expense Example [Heading] rr_ExpenseExampleHeading Delete the Example section, and replace with the following: 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 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):
Principal Funds Inc | Diversified Real Asset Fund | Class A  
Prospectus: rr_ProspectusTable  
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 0.28%
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 (0.13%) [1],[2]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.21%
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination 12/30/2021
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 $ 771
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,070
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,916
Principal Funds Inc | Diversified Real Asset Fund | Class C  
Prospectus: rr_ProspectusTable  
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 0.40%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 2.21%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.25%) [1],[2]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.96%
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination December 30, 2021
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 $ 667
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,162
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 2,525
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 667
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,162
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 2,525
Principal Funds Inc | Diversified Real Asset Fund | Institutional Class  
Prospectus: rr_ProspectusTable  
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.80%
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 0.96%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.12%) [1],[2]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.84%
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination December 30, 2021
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 $ 294
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 519
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,167
Principal Funds Inc | Diversified Real Asset Fund | R-3  
Prospectus: rr_ProspectusTable  
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 0.34%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.40%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.05%) [1],[2]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.35%
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination December 30, 2021
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 $ 438
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 761
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,675
Principal Funds Inc | Diversified Real Asset Fund | R-4  
Prospectus: rr_ProspectusTable  
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 0.30%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.21%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.05%) [1],[2]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.16%
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination December 30, 2021
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 $ 379
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 660
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,462
Principal Funds Inc | Diversified Real Asset Fund | R-5  
Prospectus: rr_ProspectusTable  
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.80%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.28%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.09%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.05%) [1],[2]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.04%
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination December 30, 2021
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 $ 342
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 596
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,324
Principal Funds Inc | Diversified Real Asset Fund | R-6  
Prospectus: rr_ProspectusTable  
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.80%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.03%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.84%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.06%) [1],[2]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.78%
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination December 30, 2020
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 $ 262
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 460
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,032
[1] Principal Global Investors, LLC ("PGI"), the investment advisor, has contractually agreed to limit the Fund's Management Fees through the period ending December 30, 2021. The fee waiver will reduce the Fund's Management Fees by 0.05% (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.
[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 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 1.20% for Class A, 1.95% for Class C, and 0.83% for Institutional Class shares. It is expected that these expense limits will continue through the period ending December 30, 2021; 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. 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 other extraordinary expenses). It is expected that the expense limit for Class R-6 shares will continue through the period ending December 30, 2020; 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.