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Prospectus: rr_ProspectusTable  
Document Type dei_DocumentType 497
Document Period End Date dei_DocumentPeriodEndDate Oct. 31, 2015
Entity Registrant Name dei_EntityRegistrantName PRINCIPAL FUNDS INC
Central Index Key dei_EntityCentralIndexKey 0000898745
Amendment Flag dei_AmendmentFlag false
Document Creation Date dei_DocumentCreationDate Dec. 16, 2016
Document Effective Date dei_DocumentEffectiveDate Dec. 16, 2016
Prospectus Date rr_ProspectusDate Mar. 01, 2016
Supplement [Text Block] ck0000898745_SupplementTextBlock
Principal Funds, Inc.

Supplement dated December 16, 2016
to the Statutory Prospectus dated March 1, 2016
(as supplemented on March 9, 2016, March 18, 2016, May 2, 2016, May 31, 2016,
June 17, 2016, June 30, 2016, July 29, 2016, August 5, 2016, September 16, 2016,
September 22, 2016, November 2, 2016, and November 15, 2016)

This supplement updates information currently in the Statutory Prospectus. Please retain this supplement for future reference.
Delete references to the following funds from this prospectus: Principal LifeTime Hybrid 2015, Principal LifeTime Hybrid 2020, Principal LifeTime Hybrid 2025, Principal LifeTime Hybrid 2030, Principal LifeTime Hybrid 2035, Principal LifeTime Hybrid 2040, Principal LifeTime Hybrid 2045, Principal LifeTime Hybrid 2050, Principal LifeTime Hybrid 2055, Principal LifeTime Hybrid 2060, and Principal LifeTime Hybrid Income Funds. See the Principal Funds, Inc. Prospectus dated June 28, 2016 for current information on these Funds.
Delete references to the following funds from this prospectus: SmallCap, SmallCap Growth I, SmallCap S&P 600 Index, SmallCap Value II, and Tax-Exempt Bond Funds. See the Principal Funds, Inc. Prospectus dated November 22, 2016 for current information on these Funds.
Principal LifeTime Hybrid 2015 Fund  
Prospectus: rr_ProspectusTable  
Supplement [Text Block] ck0000898745_SupplementTextBlock
Delete references to the following funds from this prospectus: Principal LifeTime Hybrid 2015, Principal LifeTime Hybrid 2020, Principal LifeTime Hybrid 2025, Principal LifeTime Hybrid 2030, Principal LifeTime Hybrid 2035, Principal LifeTime Hybrid 2040, Principal LifeTime Hybrid 2045, Principal LifeTime Hybrid 2050, Principal LifeTime Hybrid 2055, Principal LifeTime Hybrid 2060, and Principal LifeTime Hybrid Income Funds. See the Principal Funds, Inc. Prospectus dated June 28, 2016 for current information on these Funds.
Principal LifeTime Hybrid 2020 Fund  
Prospectus: rr_ProspectusTable  
Supplement [Text Block] ck0000898745_SupplementTextBlock
Delete references to the following funds from this prospectus: Principal LifeTime Hybrid 2015, Principal LifeTime Hybrid 2020, Principal LifeTime Hybrid 2025, Principal LifeTime Hybrid 2030, Principal LifeTime Hybrid 2035, Principal LifeTime Hybrid 2040, Principal LifeTime Hybrid 2045, Principal LifeTime Hybrid 2050, Principal LifeTime Hybrid 2055, Principal LifeTime Hybrid 2060, and Principal LifeTime Hybrid Income Funds. See the Principal Funds, Inc. Prospectus dated June 28, 2016 for current information on these Funds.
Principal LifeTime Hybrid 2025 Fund  
Prospectus: rr_ProspectusTable  
Supplement [Text Block] ck0000898745_SupplementTextBlock
Delete references to the following funds from this prospectus: Principal LifeTime Hybrid 2015, Principal LifeTime Hybrid 2020, Principal LifeTime Hybrid 2025, Principal LifeTime Hybrid 2030, Principal LifeTime Hybrid 2035, Principal LifeTime Hybrid 2040, Principal LifeTime Hybrid 2045, Principal LifeTime Hybrid 2050, Principal LifeTime Hybrid 2055, Principal LifeTime Hybrid 2060, and Principal LifeTime Hybrid Income Funds. See the Principal Funds, Inc. Prospectus dated June 28, 2016 for current information on these Funds.
Principal LifeTime Hybrid 2030 Fund  
Prospectus: rr_ProspectusTable  
Supplement [Text Block] ck0000898745_SupplementTextBlock
Delete references to the following funds from this prospectus: Principal LifeTime Hybrid 2015, Principal LifeTime Hybrid 2020, Principal LifeTime Hybrid 2025, Principal LifeTime Hybrid 2030, Principal LifeTime Hybrid 2035, Principal LifeTime Hybrid 2040, Principal LifeTime Hybrid 2045, Principal LifeTime Hybrid 2050, Principal LifeTime Hybrid 2055, Principal LifeTime Hybrid 2060, and Principal LifeTime Hybrid Income Funds. See the Principal Funds, Inc. Prospectus dated June 28, 2016 for current information on these Funds.
Principal LifeTime Hybrid 2035 Fund  
Prospectus: rr_ProspectusTable  
Supplement [Text Block] ck0000898745_SupplementTextBlock
Delete references to the following funds from this prospectus: Principal LifeTime Hybrid 2015, Principal LifeTime Hybrid 2020, Principal LifeTime Hybrid 2025, Principal LifeTime Hybrid 2030, Principal LifeTime Hybrid 2035, Principal LifeTime Hybrid 2040, Principal LifeTime Hybrid 2045, Principal LifeTime Hybrid 2050, Principal LifeTime Hybrid 2055, Principal LifeTime Hybrid 2060, and Principal LifeTime Hybrid Income Funds. See the Principal Funds, Inc. Prospectus dated June 28, 2016 for current information on these Funds.
Principal LifeTime Hybrid 2040 Fund  
Prospectus: rr_ProspectusTable  
Supplement [Text Block] ck0000898745_SupplementTextBlock
Delete references to the following funds from this prospectus: Principal LifeTime Hybrid 2015, Principal LifeTime Hybrid 2020, Principal LifeTime Hybrid 2025, Principal LifeTime Hybrid 2030, Principal LifeTime Hybrid 2035, Principal LifeTime Hybrid 2040, Principal LifeTime Hybrid 2045, Principal LifeTime Hybrid 2050, Principal LifeTime Hybrid 2055, Principal LifeTime Hybrid 2060, and Principal LifeTime Hybrid Income Funds. See the Principal Funds, Inc. Prospectus dated June 28, 2016 for current information on these Funds.
Principal LifeTime Hybrid 2045 Fund  
Prospectus: rr_ProspectusTable  
Supplement [Text Block] ck0000898745_SupplementTextBlock
Delete references to the following funds from this prospectus: Principal LifeTime Hybrid 2015, Principal LifeTime Hybrid 2020, Principal LifeTime Hybrid 2025, Principal LifeTime Hybrid 2030, Principal LifeTime Hybrid 2035, Principal LifeTime Hybrid 2040, Principal LifeTime Hybrid 2045, Principal LifeTime Hybrid 2050, Principal LifeTime Hybrid 2055, Principal LifeTime Hybrid 2060, and Principal LifeTime Hybrid Income Funds. See the Principal Funds, Inc. Prospectus dated June 28, 2016 for current information on these Funds.
Principal LifeTime Hybrid 2050 Fund  
Prospectus: rr_ProspectusTable  
Supplement [Text Block] ck0000898745_SupplementTextBlock
Delete references to the following funds from this prospectus: Principal LifeTime Hybrid 2015, Principal LifeTime Hybrid 2020, Principal LifeTime Hybrid 2025, Principal LifeTime Hybrid 2030, Principal LifeTime Hybrid 2035, Principal LifeTime Hybrid 2040, Principal LifeTime Hybrid 2045, Principal LifeTime Hybrid 2050, Principal LifeTime Hybrid 2055, Principal LifeTime Hybrid 2060, and Principal LifeTime Hybrid Income Funds. See the Principal Funds, Inc. Prospectus dated June 28, 2016 for current information on these Funds.
Principal LifeTime Hybrid 2055 Fund  
Prospectus: rr_ProspectusTable  
Supplement [Text Block] ck0000898745_SupplementTextBlock
Delete references to the following funds from this prospectus: Principal LifeTime Hybrid 2015, Principal LifeTime Hybrid 2020, Principal LifeTime Hybrid 2025, Principal LifeTime Hybrid 2030, Principal LifeTime Hybrid 2035, Principal LifeTime Hybrid 2040, Principal LifeTime Hybrid 2045, Principal LifeTime Hybrid 2050, Principal LifeTime Hybrid 2055, Principal LifeTime Hybrid 2060, and Principal LifeTime Hybrid Income Funds. See the Principal Funds, Inc. Prospectus dated June 28, 2016 for current information on these Funds.
Principal LifeTime 2060 Fund [Member]  
Prospectus: rr_ProspectusTable  
Supplement [Text Block] ck0000898745_SupplementTextBlock
Delete references to the following funds from this prospectus: Principal LifeTime Hybrid 2015, Principal LifeTime Hybrid 2020, Principal LifeTime Hybrid 2025, Principal LifeTime Hybrid 2030, Principal LifeTime Hybrid 2035, Principal LifeTime Hybrid 2040, Principal LifeTime Hybrid 2045, Principal LifeTime Hybrid 2050, Principal LifeTime Hybrid 2055, Principal LifeTime Hybrid 2060, and Principal LifeTime Hybrid Income Funds. See the Principal Funds, Inc. Prospectus dated June 28, 2016 for current information on these Funds.
Principal LifeTime Hybrid Income Fund  
Prospectus: rr_ProspectusTable  
Supplement [Text Block] ck0000898745_SupplementTextBlock
Delete references to the following funds from this prospectus: Principal LifeTime Hybrid 2015, Principal LifeTime Hybrid 2020, Principal LifeTime Hybrid 2025, Principal LifeTime Hybrid 2030, Principal LifeTime Hybrid 2035, Principal LifeTime Hybrid 2040, Principal LifeTime Hybrid 2045, Principal LifeTime Hybrid 2050, Principal LifeTime Hybrid 2055, Principal LifeTime Hybrid 2060, and Principal LifeTime Hybrid Income Funds. See the Principal Funds, Inc. Prospectus dated June 28, 2016 for current information on these Funds.
SmallCap Fund [Member]  
Prospectus: rr_ProspectusTable  
Supplement [Text Block] ck0000898745_SupplementTextBlock
Delete references to the following funds from this prospectus: SmallCap, SmallCap Growth I, SmallCap S&P 600 Index, SmallCap Value II, and Tax-Exempt Bond Funds. See the Principal Funds, Inc. Prospectus dated November 22, 2016 for current information on these Funds.
SmallCap Growth Fund I [Member]  
Prospectus: rr_ProspectusTable  
Supplement [Text Block] ck0000898745_SupplementTextBlock
Delete references to the following funds from this prospectus: SmallCap, SmallCap Growth I, SmallCap S&P 600 Index, SmallCap Value II, and Tax-Exempt Bond Funds. See the Principal Funds, Inc. Prospectus dated November 22, 2016 for current information on these Funds.
SmallCap S&P 600 Index Fund [Member]  
Prospectus: rr_ProspectusTable  
Supplement [Text Block] ck0000898745_SupplementTextBlock
Delete references to the following funds from this prospectus: SmallCap, SmallCap Growth I, SmallCap S&P 600 Index, SmallCap Value II, and Tax-Exempt Bond Funds. See the Principal Funds, Inc. Prospectus dated November 22, 2016 for current information on these Funds.
SmallCap Value Fund II [Member]  
Prospectus: rr_ProspectusTable  
Supplement [Text Block] ck0000898745_SupplementTextBlock
Delete references to the following funds from this prospectus: SmallCap, SmallCap Growth I, SmallCap S&P 600 Index, SmallCap Value II, and Tax-Exempt Bond Funds. See the Principal Funds, Inc. Prospectus dated November 22, 2016 for current information on these Funds.
Tax-Exempt Bond Fund [Member]  
Prospectus: rr_ProspectusTable  
Supplement [Text Block] ck0000898745_SupplementTextBlock
Delete references to the following funds from this prospectus: SmallCap, SmallCap Growth I, SmallCap S&P 600 Index, SmallCap Value II, and Tax-Exempt Bond Funds. See the Principal Funds, Inc. Prospectus dated November 22, 2016 for current information on these Funds.
Principal Funds Inc | Principal LifeTime 2055 Fund [Member]  
Prospectus: rr_ProspectusTable  
Risk/Return [Heading] rr_RiskReturnHeading PRINCIPAL LIFETIME 2055 FUND
Performance Table Narrative rr_PerformanceTableNarrativeTextBlock
In the Average Annual Total Returns table, change “S&P Target Date 2055+ Index” to “S&P Target Date 2055 Index”.
Principal Funds Inc | Principal LifeTime 2060 Fund [Member]  
Prospectus: rr_ProspectusTable  
Risk/Return [Heading] rr_RiskReturnHeading PRINCIPAL LIFETIME 2060 FUND
Performance Table Narrative rr_PerformanceTableNarrativeTextBlock
In the Average Annual Total Returns table, change “S&P Target Date 2055+ Index” to “S&P Target Date 2055 Index”.
Effective December 31, 2016, insert a row above “S&P Target Date 2055 Index”, and add the following:
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock
Effective December 31, 2016, add the following after the paragraph that begins, “After-tax returns are calculated . . .”:
Effective December 31, 2016, the Fund’s primary benchmark changed from S&P Target Date 2055 Index to the S&P Target Date 2060+ Index because of the recent availability of the index which more closely aligns with the investment approach of the Fund.
Caption rr_AverageAnnualReturnCaption Average Annual Total Returns for the periods ended December 31, 2015
Principal Funds Inc | Principal LifeTime 2060 Fund [Member] | S&P target date 2060 plus index  
Prospectus: rr_ProspectusTable  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
Label rr_AverageAnnualReturnLabel S&P Target Date 2060+ Index (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 (0.66%)
Since Inception rr_AverageAnnualReturnSinceInception 8.21%