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Label Element Value
Prospectus: rr_ProspectusTable  
Document Type dei_DocumentType Other
Document Period End Date dei_DocumentPeriodEndDate Aug. 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 Sep. 16, 2016
Document Effective Date dei_DocumentEffectiveDate Sep. 16, 2016
Prospectus Date rr_ProspectusDate Dec. 31, 2015
Credit Opportunities Explorer Fund  
Prospectus: rr_ProspectusTable  
Supplement [Text Block] ck0000898745_SupplementTextBlock
Principal Funds, Inc.
Supplement dated September 16, 2016
to the Statutory Prospectus dated December 31, 2015
(as supplemented on March 18, 2016, May 31, 2016, June 17, 2016,
June 30, 2016, and July 29, 2016)
This supplement updates information currently in the Statutory Prospectus. Please retain this supplement for future reference.
Risk/Return [Heading] rr_RiskReturnHeading CREDIT OPPORTUNITIES EXPLORER FUND
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Delete the Annual Fund Operating Expenses table, and replace with the following:Annual Fund Operating Expenses(expenses that you pay each year as a percentage of the value of your investment)
Expense Example [Heading] rr_ExpenseExampleHeading Delete the Example table, and replace with the following: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. 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:
Credit Opportunities Explorer Fund | Credit Opportunities Explorer Fund, Class A  
Prospectus: rr_ProspectusTable  
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.60%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets [1]
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.54%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.15%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.29%) [2]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.86%
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination December 30, 2016
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 459
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 699
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 957
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,695
Credit Opportunities Explorer Fund | Credit Opportunities Explorer Fund, Institutional  
Prospectus: rr_ProspectusTable  
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.60%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets [1]
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.46%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.07%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.36%) [2]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.71%
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination December 30, 2016
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 73
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 305
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 555
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,273
[1] Expense information in the table has been restated to reflect current fees. Effective September 1, 2016, the Distribution and/or Service (12b-1) Fees for Class A were eliminated.
[2] Principal Management Corporation ("Principal"), the investment advisor, has contractually agreed to limit the Fund’s expenses by paying, if necessary, expenses normally payable by the Fund, (excluding interest expense, expenses related to fund investments, acquired fund fees and expenses, and other extraordinary expenses) to maintain a total level of operating expenses (expressed as a percent of average net assets on an annualized basis) not to exceed 0.85% for Class A, and 0.70% for Institutional Class shares. It is expected that the expense limits will continue through the period ending December 30, 2016; however, Principal Funds, Inc. and Principal, the parties to the agreement, may mutually agree to terminate the expense limits prior to the end of the period.