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Label Element Value
Principal Funds Inc  
Prospectus [Line Items] rr_ProspectusLineItems  
Supplement to Prospectus [Text Block] rr_SupplementToProspectusTextBlock
Principal Funds, Inc.
Supplement dated March 18, 2024
to the Prospectus dated December 31, 2023
(as previously supplemented)
Principal Funds Inc | International Equity Index Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading SUMMARY FOR INTERNATIONAL EQUITY INDEX FUND
Performance Table Heading rr_PerformanceTableHeading In the Average Annual Total Returns section, delete the table and replace with the following:Average Annual Total ReturnsFor the periods ended December 31, 2022
Principal Funds Inc | International Equity Index 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 (14.46%)
5 Years rr_AverageAnnualReturnYear05 1.54%
10 Years rr_AverageAnnualReturnYear10 4.67%
Principal Funds Inc | International Equity Index Fund | Institutional Class  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Institutional Class Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 (14.41%)
5 Years rr_AverageAnnualReturnYear05 1.46%
10 Years rr_AverageAnnualReturnYear10 4.34%
Principal Funds Inc | International Equity 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 (14.93%)
5 Years rr_AverageAnnualReturnYear05 0.72%
10 Years rr_AverageAnnualReturnYear10 3.29%
Principal Funds Inc | International Equity 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 (8.08%)
5 Years rr_AverageAnnualReturnYear05 1.21%
10 Years rr_AverageAnnualReturnYear10 3.41%
Principal Funds Inc | International Equity Index Fund | Class R-1  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Class R-1 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 (15.17%)
5 Years rr_AverageAnnualReturnYear05 0.58%
10 Years rr_AverageAnnualReturnYear10 3.43%
Principal Funds Inc | International Equity Index Fund | Class R-3  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Class R-3 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 (14.89%)
5 Years rr_AverageAnnualReturnYear05 0.88%
10 Years rr_AverageAnnualReturnYear10 3.75%
Principal Funds Inc | International Equity Index Fund | Class R-4  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Class R-4 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 (14.68%)
5 Years rr_AverageAnnualReturnYear05 1.09%
10 Years rr_AverageAnnualReturnYear10 3.95%
Principal Funds Inc | International Equity Index Fund | Class R-5  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Class R-5 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 (14.61%)
5 Years rr_AverageAnnualReturnYear05 1.21%
10 Years rr_AverageAnnualReturnYear10 4.08%
Principal Funds Inc | International Equity Index Fund | Class R-6  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Class R-6 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 (14.40%)
5 Years rr_AverageAnnualReturnYear05 1.50%
10 Years rr_AverageAnnualReturnYear10 4.32%
Principal Funds Inc | International Small Company Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading SUMMARY FOR INTERNATIONAL SMALL COMPANY FUND
Performance Table Heading rr_PerformanceTableHeading In the Average Annual Total Returns section, delete the table and replace with the following:Average Annual Total ReturnsFor the periods ended December 31, 2022
Principal Funds Inc | International Small Company Fund | MSCI World Ex-U.S. 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 World Ex-U.S. Index (reflects withholding taxes on foreign dividends, but no deduction for fees, expenses, or other taxes)
1 Year rr_AverageAnnualReturnYear01 (14.30%)
5 Years rr_AverageAnnualReturnYear05 1.79%
Since Inception rr_AverageAnnualReturnSinceInception 3.85%
Principal Funds Inc | International Small Company Fund | MSCI World Ex-U.S.A. Small Cap 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 World Ex-U.S.A. Small Cap Index NTR (reflects withholding taxes on foreign dividends, but no deduction for fees, expenses, or other taxes)
1 Year rr_AverageAnnualReturnYear01 (20.60%)
5 Years rr_AverageAnnualReturnYear05 0.45%
Since Inception rr_AverageAnnualReturnSinceInception 4.97%
Principal Funds Inc | International Small Company Fund | Institutional Class  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Institutional Class Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 (21.92%)
5 Years rr_AverageAnnualReturnYear05 (2.05%)
Since Inception rr_AverageAnnualReturnSinceInception 2.35%
Principal Funds Inc | International Small Company 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 (22.01%)
5 Years rr_AverageAnnualReturnYear05 (3.03%)
Since Inception rr_AverageAnnualReturnSinceInception 1.49%
Principal Funds Inc | International Small Company 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 (12.69%)
5 Years rr_AverageAnnualReturnYear05 (1.40%)
Since Inception rr_AverageAnnualReturnSinceInception 1.84%
Principal Funds Inc | International Small Company Fund | Class R-6  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Class R-6 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 (21.89%)
5 Years rr_AverageAnnualReturnYear05 (1.94%)
Since Inception rr_AverageAnnualReturnSinceInception 2.34%
Principal Funds Inc | Origin Emerging Markets Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading SUMMARY FOR ORIGIN EMERGING MARKETS FUND
Performance Table Heading rr_PerformanceTableHeading In the Average Annual Total Returns section, delete the table and replace with the following:Average Annual Total ReturnsFor the periods ended December 31, 2022
Principal Funds Inc | Origin 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 (20.10%)
5 Years rr_AverageAnnualReturnYear05 (1.40%)
Since Inception rr_AverageAnnualReturnSinceInception 1.98%
Principal Funds Inc | Origin Emerging Markets Fund | Class A  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Class A Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 (33.82%)
5 Years rr_AverageAnnualReturnYear05 (5.71%)
Since Inception rr_AverageAnnualReturnSinceInception (0.69%) [1]
Principal Funds Inc | Origin Emerging Markets 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 (34.00%)
5 Years rr_AverageAnnualReturnYear05 (5.87%)
Since Inception rr_AverageAnnualReturnSinceInception (0.77%) [1]
Principal Funds Inc | Origin 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
1 Year rr_AverageAnnualReturnYear01 (19.58%)
5 Years rr_AverageAnnualReturnYear05 (3.99%)
Since Inception rr_AverageAnnualReturnSinceInception (0.29%) [1]
Principal Funds Inc | Origin Emerging Markets Fund | Institutional Class  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Institutional Class Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 (29.70%)
5 Years rr_AverageAnnualReturnYear05 (4.23%)
Since Inception rr_AverageAnnualReturnSinceInception 0.23%
Principal Funds Inc | Origin Emerging Markets Fund | Class R-6  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Class R-6 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 (29.61%)
5 Years rr_AverageAnnualReturnYear05 (4.11%)
Since Inception rr_AverageAnnualReturnSinceInception 0.30%
Principal Funds Inc | Small-MidCap Dividend Income Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading SUMMARY FOR SMALL-MIDCAP DIVIDEND INCOME FUND
Performance Table Heading rr_PerformanceTableHeading In the Average Annual Total Returns section, delete the table and replace with the following:Average Annual Total ReturnsFor the periods ended December 31, 2022
Principal Funds Inc | Small-MidCap Dividend Income 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 (19.22%)
5 Years rr_AverageAnnualReturnYear05 8.79%
10 Years rr_AverageAnnualReturnYear10 12.13%
Principal Funds Inc | Small-MidCap Dividend Income Fund | Russell 2500 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 2500 Value Index (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 (13.09%)
5 Years rr_AverageAnnualReturnYear05 4.75%
10 Years rr_AverageAnnualReturnYear10 8.93%
Principal Funds Inc | Small-MidCap Dividend Income Fund | Class A  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Class A Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 (16.78%)
5 Years rr_AverageAnnualReturnYear05 1.71%
10 Years rr_AverageAnnualReturnYear10 7.87%
Principal Funds Inc | Small-MidCap Dividend 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 (18.03%)
5 Years rr_AverageAnnualReturnYear05 0.42%
10 Years rr_AverageAnnualReturnYear10 6.58%
Principal Funds Inc | Small-MidCap Dividend 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 (9.04%)
5 Years rr_AverageAnnualReturnYear05 1.14%
10 Years rr_AverageAnnualReturnYear10 6.10%
Principal Funds Inc | Small-MidCap Dividend Income Fund | Class C  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Class C Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 (13.43%)
5 Years rr_AverageAnnualReturnYear05 2.11%
10 Years rr_AverageAnnualReturnYear10 7.81%
Principal Funds Inc | Small-MidCap Dividend Income Fund | Institutional Class  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Institutional Class Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 (11.67%)
5 Years rr_AverageAnnualReturnYear05 3.16%
10 Years rr_AverageAnnualReturnYear10 8.83%
Principal Funds Inc | Small-MidCap Dividend Income Fund | Class R-6  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Class R-6 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 (11.62%)
5 Years rr_AverageAnnualReturnYear05 3.26%
10 Years rr_AverageAnnualReturnYear10 8.87%
Principal Funds Inc | Spectrum Preferred and Capital Securities Income Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading SUMMARY FOR SPECTRUM PREFERRED AND CAPITAL SECURITIES INCOME FUND
Principal Funds Inc | Bond Market Index Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading SUMMARY FOR BOND MARKET INDEX FUND
Principal Funds Inc | Diversified Real Asset Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading Diversified Real Asset Fund
Principal Funds Inc | Global Multi-Strategy Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading Global Multi-Strategy Fund
Principal Funds Inc | Blue Chip Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading SUMMARY FOR BLUE CHIP FUND
Principal Funds Inc | Opportunistic Municipal Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading Opportunistic Municipal Fund
Principal Funds Inc | Capital Securities Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading Capital Securities Fund
Principal Funds Inc | EDGE MidCap Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading EDGE MidCap Fund
Principal Funds Inc | Global Sustainable Listed Infrastructure Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading SUMMARY FOR GLOBAL SUSTAINABLE LISTED INFRASTRUCTURE FUND
[1] During 2015, the Class experienced a significant withdrawal of monies by an affiliate. As the remaining shareholders held relatively small positions, the total return amounts expressed herein are greater than those that would have been experienced without the withdrawal.