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Label Element Value
Prospectus: rr_ProspectusTable  
Document Type dei_DocumentType 497
Document Period End Date dei_DocumentPeriodEndDate Oct. 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 Jun. 12, 2020
Document Effective Date dei_DocumentEffectiveDate Jun. 12, 2020
Prospectus Date rr_ProspectusDate Mar. 01, 2020
Principal Funds Inc | SmallCap Value Fund II [Member]  
Prospectus: rr_ProspectusTable  
Supplement [Text Block] ck0000898745_SupplementTextBlock
Principal Funds, Inc.
Supplement dated June 12, 2020
to the Statutory Prospectus dated March 1, 2020
(as previously supplemented)
This supplement updates information currently in the Statutory Prospectus. Please retain this supplement for future reference.
Risk/Return [Heading] rr_RiskReturnHeading SUMMARY FOR SMALLCAP VALUE FUND II
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Effective July 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)
Expenses Restated to Reflect Current [Text] rr_ExpensesRestatedToReflectCurrent Fees have been restated to reflect current fees.
Expense Example [Heading] rr_ExpenseExampleHeading Effective July 1, 2020, 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 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):
Principal Funds Inc | SmallCap Value Fund II [Member] | Class A  
Prospectus: rr_ProspectusTable  
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.94% [1]
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.66%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.02%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.87%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.40%) [2],[3]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.47%
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination February 28, 2022
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 691
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 1,069
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,470
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 2,589
Principal Funds Inc | SmallCap Value Fund II [Member] | Class J  
Prospectus: rr_ProspectusTable  
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.94% [1]
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.15%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.38%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.02%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.49%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.02%) [2],[3]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.47%
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination February 28, 2022
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 250
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
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 150
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 469
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 811
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,778
Principal Funds Inc | SmallCap Value Fund II [Member] | Institutional Class  
Prospectus: rr_ProspectusTable  
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.94% [1]
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.12%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.02%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.08%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.10%) [2],[3]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.98%
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination February 28, 2022
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 100
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 334
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 586
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,308
Principal Funds Inc | SmallCap Value Fund II [Member] | R-1  
Prospectus: rr_ProspectusTable  
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.94% [1]
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 0.02%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.85%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.02%) [2],[3]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.83%
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination February 28, 2022
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 186
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 580
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 999
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 2,168
Principal Funds Inc | SmallCap Value Fund II [Member] | R-2  
Prospectus: rr_ProspectusTable  
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.94% [1]
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.30%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.46%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.02%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.72%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.02%) [2],[3]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.70%
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination February 28, 2022
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 173
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 540
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 931
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 2,029
Principal Funds Inc | SmallCap Value Fund II [Member] | R-3  
Prospectus: rr_ProspectusTable  
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.94% [1]
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 0.02%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.54%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.02%) [2],[3]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.52%
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination February 28, 2022
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 155
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 484
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 838
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,833
Principal Funds Inc | SmallCap Value Fund II [Member] | R-4  
Prospectus: rr_ProspectusTable  
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.94% [1]
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 0.02%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.35%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.02%) [2],[3]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.33%
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination February 28, 2022
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 135
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 426
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 737
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,622
Principal Funds Inc | SmallCap Value Fund II [Member] | R-5  
Prospectus: rr_ProspectusTable  
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.94% [1]
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.27%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.02%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.23%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.02%) [2],[3]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.21%
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination February 28, 2022
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 123
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 388
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 674
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,487
Principal Funds Inc | SmallCap Value Fund II [Member] | R-6  
Prospectus: rr_ProspectusTable  
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.94% [1]
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.02%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.02%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.98%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.02%) [2],[3]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.96%
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination February 28, 2022
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 98
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 310
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 540
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,200
[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 Management Fees through the period ending February 28, 2022. 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.
[3] 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 1.45% for Class A and 0.96% 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 other extraordinary expenses). It is expected that the expense limits will continue through the period ending February 28, 2022; 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.