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Label Element Value
Prospectus: rr_ProspectusTable  
Document Type dei_DocumentType 497
Document Period End Date dei_DocumentPeriodEndDate Oct. 31, 2018
Entity Registrant Name dei_EntityRegistrantName PRINCIPAL FUNDS INC
Central Index Key dei_EntityCentralIndexKey 0000898745
Amendment Flag dei_AmendmentFlag false
Document Creation Date dei_DocumentCreationDate Jul. 02, 2019
Document Effective Date dei_DocumentEffectiveDate Jul. 02, 2019
Prospectus Date rr_ProspectusDate Mar. 01, 2019
Principal Funds Inc  
Prospectus: rr_ProspectusTable  
Supplement [Text Block] ck0000898745_SupplementTextBlock
Principal Funds, Inc.
Supplement dated July 2, 2019
to the Statutory Prospectus dated March 1, 2019
(as supplemented on March 18, 2019, April 3, 2019, April 9, 2019, April 12, 2019, April 29, 2019, May 24, 2019, May 31, 2019, June 14, 2019,
June 24, 2019 and July 1, 2019)
This supplement updates information currently in the Statutory Prospectus. Please retain this supplement for future reference.
Principal Funds Inc | Global Diversified Income Fund  
Prospectus: rr_ProspectusTable  
Risk/Return [Heading] rr_RiskReturnHeading SUMMARY FOR GLOBAL DIVERSIFIED INCOME FUND
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
Under Performance, delete the Average Annual Total Returns table and replace with the following:
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns For the periods ended December 31, 2018
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock
In the Performance section, delete the second paragraph under the Average Annual Total Returns table and replace with the following:
Performance of a blended index shows how the Fund’s performance compares to a blend of indices with similar investment objectives. Performance of each component of the blended index is also shown. The weightings for the GDI Blended Index are: 80% Bloomberg Barclays Global Aggregate Index and 20% MSCI World Value Index NR. The custom or blended index returns reflect the allocation in effect for the time period(s) for which the fund returns are disclosed. Previous weightings or allocations of the custom or blended index are not restated.
Effective July 1, 2019, the Fund’s primary benchmark changed from Bloomberg Barclays U.S. Corporate High Yield 2% Issuer Capped Index to the Bloomberg Barclays Global Aggregate Index because the latter more closely aligns with the Fund’s current investment approach.
Principal Funds Inc | Global Diversified Income Fund | Bloomberg Barclays U.S. Corporate High Yield 2% Issuer Capped Index [Member]  
Prospectus: rr_ProspectusTable  
Label rr_AverageAnnualReturnLabel Bloomberg Barclays U.S. Corporate High Yield 2% Issuer Capped Index (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 (2.08%)
5 Years rr_AverageAnnualReturnYear05 3.84%
10 Years rr_AverageAnnualReturnYear10 11.14%
Principal Funds Inc | Global Diversified Income Fund | Bloomberg Barclays Global Aggregate Index  
Prospectus: rr_ProspectusTable  
Label rr_AverageAnnualReturnLabel Bloomberg Barclays Global Aggregate Index (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 (1.20%)
5 Years rr_AverageAnnualReturnYear05 1.08%
10 Years rr_AverageAnnualReturnYear10 2.49%
Principal Funds Inc | Global Diversified Income Fund | MSCI World Value Index (NR)  
Prospectus: rr_ProspectusTable  
Label rr_AverageAnnualReturnLabel MSCI World Value Index (NR) (reflects withholding taxes on foreign dividends, but no deduction for fees, expenses, or other taxes)
1 Year rr_AverageAnnualReturnYear01 (10.78%)
5 Years rr_AverageAnnualReturnYear05 2.98%
10 Years rr_AverageAnnualReturnYear10 8.24%
Principal Funds Inc | Global Diversified Income Fund | GDI Blended Index  
Prospectus: rr_ProspectusTable  
Label rr_AverageAnnualReturnLabel GDI Blended Index (except as noted for MSCI Value Index NR, reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 (3.05%)
5 Years rr_AverageAnnualReturnYear05 1.56%
10 Years rr_AverageAnnualReturnYear10 3.77%
Principal Funds Inc | Global Diversified Income Fund | Class A  
Prospectus: rr_ProspectusTable  
Label rr_AverageAnnualReturnLabel Class A Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 (9.19%)
5 Years rr_AverageAnnualReturnYear05 2.45%
10 Years rr_AverageAnnualReturnYear10 8.77%
Principal Funds Inc | Global Diversified Income Fund | Class A | After Taxes on Distributions  
Prospectus: rr_ProspectusTable  
Label rr_AverageAnnualReturnLabel Class A Return After Taxes on Distributions
1 Year rr_AverageAnnualReturnYear01 (10.61%)
5 Years rr_AverageAnnualReturnYear05 0.46%
10 Years rr_AverageAnnualReturnYear10 6.34%
Principal Funds Inc | Global Diversified Income Fund | Class A | After Taxes on Distributions and Sales  
Prospectus: rr_ProspectusTable  
Label rr_AverageAnnualReturnLabel Class A Return After Taxes on Distributions and Sale of Fund Shares
1 Year rr_AverageAnnualReturnYear01 (5.25%)
5 Years rr_AverageAnnualReturnYear05 1.10%
10 Years rr_AverageAnnualReturnYear10 6.06%
Principal Funds Inc | Global Diversified Income Fund | Class C  
Prospectus: rr_ProspectusTable  
Label rr_AverageAnnualReturnLabel Class C Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 (7.24%)
5 Years rr_AverageAnnualReturnYear05 2.46%
10 Years rr_AverageAnnualReturnYear10 8.36%
Principal Funds Inc | Global Diversified Income Fund | Institutional Class  
Prospectus: rr_ProspectusTable  
Label rr_AverageAnnualReturnLabel Institutional Class Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 (5.39%)
5 Years rr_AverageAnnualReturnYear05 3.56%
10 Years rr_AverageAnnualReturnYear10 9.48%
Principal Funds Inc | Global Diversified Income Fund | R-6  
Prospectus: rr_ProspectusTable  
Label rr_AverageAnnualReturnLabel Class R-6 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 (5.43%)
5 Years rr_AverageAnnualReturnYear05 3.54%
10 Years rr_AverageAnnualReturnYear10 9.44%