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Label Element Value
Risk/Return: rr_RiskReturnAbstract  
Document Type dei_DocumentType Other
Document Period End Date dei_DocumentPeriodEndDate Jun. 03, 2014
Registrant Name dei_EntityRegistrantName PRINCIPAL FUNDS INC
Central Index Key dei_EntityCentralIndexKey 0000898745
Amendment Flag dei_AmendmentFlag false
Document Creation Date dei_DocumentCreationDate Jun. 03, 2014
Document Effective Date dei_DocumentEffectiveDate Jun. 03, 2014
Prospectus Date rr_ProspectusDate Mar. 01, 2014
PFI Prospectus - Institutional, R-1, R-2, R-3, R-4, and R-5 Class Shares [Member]
  
Risk/Return: rr_RiskReturnAbstract  
Supplement [Text Block] ck0000898745_SupplementTextBlock
Supplement dated June 3, 2014
to the Classes Institutional, R-1, R-2, R-3, R-4 and R-5 Shares Prospectus
for Principal Funds, Inc.
dated March 1, 2014

As supplemented on March 7, 2014, March 14, 2014 and April 28, 2014

This supplement updates information currently in the Prospectus. Retain this supplement with the Prospectus.

FUND SUMMARIES
PFI Prospectus - Institutional, R-1, R-2, R-3, R-4, and R-5 Class Shares [Member] | International Fund I [Member]
  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading INTERNATIONAL FUND I Delete the paragraph directly following the fund name that begins with “On March 11, 2014.”
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Delete the Annual Fund Operating Expenses table and footnotes and the Example and substitute: Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock
This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Strategy [Heading] rr_StrategyHeading Under the Principal Investment Strategies heading, delete the paragraph that begins with “Principal Management Corporation invests between...”
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Under the Performance heading, delete the bullet point that begins “Life of Fund results…” Under the Performance heading, delete the Average Annual Total Returns table and substitute:
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock
After the paragraph that begins with “After-tax returns are calculated,” add the following:
Effective June 30, 2014, the Fund’s primary benchmark will change from the MSCI EAFE Index NDTR D to the MSCI ACWI Ex-U.S. because the MSCI ACWI Ex-U.S. more closely aligns with the Fund’s investments in developed and emerging markets than the MSCI EAFE Index NDTR D.
Caption rr_AverageAnnualReturnCaption Average Annual Total Returns For the periods ended December 31, 2013
PFI Prospectus - Institutional, R-1, R-2, R-3, R-4, and R-5 Class Shares [Member] | International Fund I [Member] | MSCI - EAFE NDTR D Index [Member]
  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel MSCI EAFE Index NDTR D (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 22.78%
5 Years rr_AverageAnnualReturnYear05 12.44%
10 Years rr_AverageAnnualReturnYear10 6.91%
PFI Prospectus - Institutional, R-1, R-2, R-3, R-4, and R-5 Class Shares [Member] | International Fund I [Member] | MSCI ACWI Ex-U.S. Index [Member]
  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel MSCI ACWI Ex-U.S. (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 15.29%
5 Years rr_AverageAnnualReturnYear05 12.81%
10 Years rr_AverageAnnualReturnYear10 7.57%
PFI Prospectus - Institutional, R-1, R-2, R-3, R-4, and R-5 Class Shares [Member] | International Fund I [Member] | International I Fund, Institutional Class [Member]
  
Risk/Return: rr_RiskReturnAbstract  
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.89% [1]
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.06%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.95%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 97
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 303
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 525
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,166
Label rr_AverageAnnualReturnLabel Institutional Class Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 20.08%
5 Years rr_AverageAnnualReturnYear05 10.84%
10 Years rr_AverageAnnualReturnYear10 6.41%
PFI Prospectus - Institutional, R-1, R-2, R-3, R-4, and R-5 Class Shares [Member] | International Fund I [Member] | International I Fund, Institutional Class [Member] | After Taxes on Distributions
  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel Institutional Class Return After Taxes on Distributions
1 Year rr_AverageAnnualReturnYear01 19.83%
5 Years rr_AverageAnnualReturnYear05 10.76%
10 Years rr_AverageAnnualReturnYear10 5.89%
PFI Prospectus - Institutional, R-1, R-2, R-3, R-4, and R-5 Class Shares [Member] | International Fund I [Member] | International I Fund, Institutional Class [Member] | After Taxes on Distributions and Sales
  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel Institutional Class Return After Taxes on Distribution and Sale of Fund Shares
1 Year rr_AverageAnnualReturnYear01 11.95%
5 Years rr_AverageAnnualReturnYear05 8.92%
10 Years rr_AverageAnnualReturnYear10 5.43%
PFI Prospectus - Institutional, R-1, R-2, R-3, R-4, and R-5 Class Shares [Member] | International Fund I [Member] | International I Fund, Class R-1 [Member]
  
Risk/Return: rr_RiskReturnAbstract  
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.89% [1]
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.35%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.57%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.81%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 184
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 569
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 980
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 2,127
Label rr_AverageAnnualReturnLabel Class R-1 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 19.01%
5 Years rr_AverageAnnualReturnYear05 9.90%
10 Years rr_AverageAnnualReturnYear10 5.50%
PFI Prospectus - Institutional, R-1, R-2, R-3, R-4, and R-5 Class Shares [Member] | International Fund I [Member] | International I Fund, Class R-2 [Member]
  
Risk/Return: rr_RiskReturnAbstract  
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.89% [1]
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.30%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.49%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.68%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 171
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 530
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 913
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,987
Label rr_AverageAnnualReturnLabel Class R-2 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 19.15%
5 Years rr_AverageAnnualReturnYear05 10.02%
10 Years rr_AverageAnnualReturnYear10 5.63%
PFI Prospectus - Institutional, R-1, R-2, R-3, R-4, and R-5 Class Shares [Member] | International Fund I [Member] | International I Fund, Class R-3 [Member]
  
Risk/Return: rr_RiskReturnAbstract  
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.89% [1]
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.36%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.50%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 153
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 474
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 818
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,791
Label rr_AverageAnnualReturnLabel Class R-3 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 19.36%
5 Years rr_AverageAnnualReturnYear05 10.24%
10 Years rr_AverageAnnualReturnYear10 5.81%
PFI Prospectus - Institutional, R-1, R-2, R-3, R-4, and R-5 Class Shares [Member] | International Fund I [Member] | International I Fund, Class R-4 [Member]
  
Risk/Return: rr_RiskReturnAbstract  
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.89% [1]
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.10%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.32%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.31%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 133
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 415
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 718
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,579
Label rr_AverageAnnualReturnLabel Class R-4 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 19.67%
5 Years rr_AverageAnnualReturnYear05 10.45%
10 Years rr_AverageAnnualReturnYear10 6.02%
PFI Prospectus - Institutional, R-1, R-2, R-3, R-4, and R-5 Class Shares [Member] | International Fund I [Member] | International I Fund, Class R-5 [Member]
  
Risk/Return: rr_RiskReturnAbstract  
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.89% [1]
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.30%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.19%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 121
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 378
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 654
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,443
Label rr_AverageAnnualReturnLabel Class R-5 Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 19.76%
5 Years rr_AverageAnnualReturnYear05 10.59%
10 Years rr_AverageAnnualReturnYear10 6.15%
[1] Management fees in the table have been restated to reflect current fees. Effective June 3, 2014, the Management Fees were reduced.