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Label Element Value
Principal Funds Inc | Opportunistic Municipal Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading SUMMARY FOR OPPORTUNISTIC MUNICIPAL FUND
Supplement to Prospectus [Text Block] rr_SupplementToProspectusTextBlock
Principal Funds, Inc.
Supplement dated January 31, 2024
to the Prospectus dated December 31, 2023
This supplement updates information currently in the Prospectus. Please retain this supplement for future reference.
Performance Table Heading rr_PerformanceTableHeading Under Performance, delete the Average Annual Total Returns table and replace with the following:Average Annual Total ReturnsFor the periods ended December 31, 2023
Performance Table Market Index Changed rr_PerformanceTableMarketIndexChanged Under Performance, delete the second paragraph under the Average Annual Total Returns table and replace with the following:Effective January 31, 2024, the Fund changed its primary index to the Bloomberg Municipal Bond Index. The Bloomberg Municipal Bond Index shows how the Fund’s performance compares with the returns of an index of funds with similar investment objectives. The Fund’s former index was the Bloomberg U.S. Aggregate Bond Index.
Principal Funds Inc | Opportunistic Municipal 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%
Principal Funds Inc | Opportunistic 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 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%
Principal Funds Inc | Opportunistic Municipal Fund | Class A  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Class A Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 3.42%
5 Years rr_AverageAnnualReturnYear05 1.30%
10 Years rr_AverageAnnualReturnYear10 3.90%
Principal Funds Inc | Opportunistic 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 3.42%
5 Years rr_AverageAnnualReturnYear05 1.30%
10 Years rr_AverageAnnualReturnYear10 3.90%
Principal Funds Inc | Opportunistic 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 3.71%
5 Years rr_AverageAnnualReturnYear05 1.86%
10 Years rr_AverageAnnualReturnYear10 3.94%
Principal Funds Inc | Opportunistic Municipal Fund | Institutional Class  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Institutional Class Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 7.68%
5 Years rr_AverageAnnualReturnYear05 2.35%
10 Years rr_AverageAnnualReturnYear10 4.54%