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Label Element Value
Risk/Return: rr_RiskReturnAbstract  
Document Type dei_DocumentType Other
Document Period End Date dei_DocumentPeriodEndDate Apr. 28, 2014
Registrant Name dei_EntityRegistrantName PRINCIPAL FUNDS INC
Central Index Key dei_EntityCentralIndexKey 0000898745
Amendment Flag dei_AmendmentFlag false
Document Creation Date dei_DocumentCreationDate Apr. 28, 2014
Document Effective Date dei_DocumentEffectiveDate Apr. 28, 2014
Prospectus Date rr_ProspectusDate Mar. 01, 2014
PFI Prospectus - Class A, B, C, J, P
 
Risk/Return: rr_RiskReturnAbstract  
Supplement [Text Block] ck0000898745_SupplementTextBlock
Supplement dated April 28, 2014
to the Classes A, B, C, J, and P Shares Prospectus
for Principal Funds, Inc.
dated March 1, 2014

(as supplemented on March 7, 2014 and March 14, 2014)

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

FUND SUMMARIES
PFI Prospectus - Class A, B, C, J, P | Global Diversified Income Fund [Member]
 
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading GLOBAL DIVERSIFIED INCOME FUND
Objective [Heading] rr_ObjectiveHeading Delete the Objective and substitute:
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock
The Fund seeks income.
PFI Prospectus - Class A, B, C, J, P | Money Market Fund [Member]
 
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading MONEY MARKET FUND
Expense [Heading] rr_ExpenseHeading Delete the Annual Fund Operating Expenses table and substitute:
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
PFI Prospectus - Class A, B, C, J, P | Money Market Fund [Member] | Money Market Fund, Class A [Member]
 
Risk/Return: rr_RiskReturnAbstract  
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.39%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.15%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.55%
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.55%
PFI Prospectus - Class A, B, C, J, P | Money Market Fund [Member] | Money Market Fund, Class B [Member]
 
Risk/Return: rr_RiskReturnAbstract  
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.39%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 1.00%
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 1.94%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.38%) [1]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.56%
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination February 28, 2015
PFI Prospectus - Class A, B, C, J, P | Money Market Fund [Member] | Money Market Fund, Class C [Member]
 
Risk/Return: rr_RiskReturnAbstract  
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.39%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.27%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.67%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets none [1]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.67%
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination February 28, 2015
PFI Prospectus - Class A, B, C, J, P | Money Market Fund [Member] | Money Market Fund, Class J [Member]
 
Risk/Return: rr_RiskReturnAbstract  
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.39%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.18%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.83%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.01%) [2]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.82%
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination February 28, 2015
[1] 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 1.55% for Class B and 1.79% for Class C shares. It is expected that the expense limit will continue through the period ending February 28, 2015; however, Principal Funds, Inc. and Principal, the parties to the agreement, may agree to terminate the expense limit prior to the end of the period.
[2] Principal Funds Distributor, Inc. ("the Distributor") has contractually agreed to limit the Distribution Fees attributable to Class J. The limit will maintain the level of Distribution Fees not to exceed 0.24%. It is expected that the fee waiver will continue through the period ending February 28, 2015; however, Principal Funds, Inc. and the Distributor, the parties to the agreement, may agree to terminate the fee waiver prior to the end of the period.