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Label Element Value
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 Jun. 30, 2016
Document Effective Date dei_DocumentEffectiveDate Jun. 30, 2016
Prospectus Date rr_ProspectusDate Mar. 01, 2016
Supplement [Text Block] ck0000898745_SupplementTextBlock
Principal Funds, Inc.

Supplement dated June 30, 2016
to the Statutory Prospectus dated March 1, 2016
(as supplemented on
March 9, 2016, March 18, 2016, May 2, 2016, May 31, 2016 and June 17, 2016)

This supplement updates information currently in the Statutory Prospectus. Please retain this supplement for future reference.
Strategic Asset Management Balanced Portfolio  
Prospectus: rr_ProspectusTable  
Risk/Return [Heading] rr_RiskReturnHeading SAM (STRATEGIC ASSET MANAGEMENT) BALANCED PORTFOLIO
Strategy [Heading] rr_StrategyHeading Delete the first sentence under Principal Investment Strategies and replace with the following:
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
The SAM Portfolios operate as funds of funds and invest principally in Principal Funds, Inc. equity funds, fixed-income funds and specialty funds (“Underlying Funds”); the Sub-Advisor generally categorizes the Underlying Fund based on the investment profile of the Underlying Fund. If an Underlying Fund offers multiple classes of shares, the SAM Portfolios will purchase shares of the class with the lowest expense ratio at the time of purchase.
Strategic Asset Management Conservative Balanced Portfolio  
Prospectus: rr_ProspectusTable  
Risk/Return [Heading] rr_RiskReturnHeading SAM (STRATEGIC ASSET MANAGEMENT) CONSERVATIVE BALANCED PORTFOLIO
Strategy [Heading] rr_StrategyHeading Delete the first sentence under Principal Investment Strategies and replace with the following:
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
The SAM Portfolios operate as funds of funds and invest principally in Principal Funds, Inc. equity funds, fixed-income funds and specialty funds (“Underlying Funds”); the Sub-Advisor generally categorizes the Underlying Fund based on the investment profile of the Underlying Fund. If an Underlying Fund offers multiple classes of shares, the SAM Portfolios will purchase shares of the class with the lowest expense ratio at the time of purchase.
Strategic Asset Management Conservative Growth Portfolio  
Prospectus: rr_ProspectusTable  
Risk/Return [Heading] rr_RiskReturnHeading SAM (STRATEGIC ASSET MANAGEMENT) CONSERVATIVE GROWTH PORTFOLIO
Strategy [Heading] rr_StrategyHeading Delete the first sentence under Principal Investment Strategies and replace with the following:
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
The SAM Portfolios operate as funds of funds and invest principally in Principal Funds, Inc. equity funds, fixed-income funds and specialty funds (“Underlying Funds”); the Sub-Advisor generally categorizes the Underlying Fund based on the investment profile of the Underlying Fund. If an Underlying Fund offers multiple classes of shares, the SAM Portfolios will purchase shares of the class with the lowest expense ratio at the time of purchase.
Strategic Asset Management Flexible Income Portfolio  
Prospectus: rr_ProspectusTable  
Risk/Return [Heading] rr_RiskReturnHeading SAM (STRATEGIC ASSET MANAGEMENT) FLEXIBLE INCOME PORTFOLIO
Strategy [Heading] rr_StrategyHeading Delete the first sentence under Principal Investment Strategies and replace with the following:
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
The SAM Portfolios operate as funds of funds and invest principally in Principal Funds, Inc. equity funds, fixed-income funds and specialty funds (“Underlying Funds”); the Sub-Advisor generally categorizes the Underlying Fund based on the investment profile of the Underlying Fund. If an Underlying Fund offers multiple classes of shares, the SAM Portfolios will purchase shares of the class with the lowest expense ratio at the time of purchase.
Strategic Asset Management Strategic Growth Portfolio  
Prospectus: rr_ProspectusTable  
Risk/Return [Heading] rr_RiskReturnHeading SAM (STRATEGIC ASSET MANAGEMENT) STRATEGIC GROWTH PORTFOLIO
Strategy [Heading] rr_StrategyHeading Delete the first sentence under Principal Investment Strategies and replace with the following:
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
The SAM Portfolios operate as funds of funds and invest principally in Principal Funds, Inc. equity funds, fixed-income funds and specialty funds (“Underlying Funds”); the Sub-Advisor generally categorizes the Underlying Fund based on the investment profile of the Underlying Fund. If an Underlying Fund offers multiple classes of shares, the SAM Portfolios will purchase shares of the class with the lowest expense ratio at the time of purchase.