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Label Element Value
Risk/Return: rr_RiskReturnAbstract  
Prospectus Date rr_ProspectusDate Dec. 30, 2011
Bond Market Index Fund (Prospectus Summary): | Bond Market Index Fund
  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return, Heading rr_RiskReturnHeading BOND MARKET INDEX FUND  
Supplement Text ck0000898745_SupplementTextBlock

 

Supplement dated January 31, 2012

to the Class J Prospectus

for Principal Funds, Inc.

dated December 30, 2011

 

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

 

FUND SUMMARIES  

 

                                                                                                                                                     

BOND MARKET INDEX FUND                                                                                                          

 

On page 3, delete the Annual Fund Operating Expenses table and substitute:                                               

 

 
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination December 31, 2012
Operating Expenses, Caption rr_OperatingExpensesCaption Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment) For the period ended August 31, 2011     
Expenses, Restated to Reflect Current rr_ExpensesRestatedToReflectCurrent Expense information has been restated to reflect current fees. Certain Other Expenses of the Fund have increased effective November 1, 2011.
Expense Example, Heading rr_ExpenseExampleHeading On page 3, delete the Example tables and substitute:  
Expense Example, No Redemption, By Year, Caption rr_ExpenseExampleNoRedemptionByYearCaption You would pay the following expenses if you did not redeem your shares:  
Bond Market Index Fund | Class J
  
Risk/Return: rr_RiskReturnAbstract  
Trading Symbol dei_TradingSymbol PBIJX
Management Fees rr_ManagementFeesOverAssets 0.25%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.45%
Other Expenses rr_OtherExpensesOverAssets 0.35% [1]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.05%
Fee Waiver rr_FeeWaiverOrReimbursementOverAssets (0.20%) [2]
Total Annual Fund Operating Expenses After Fee Waiver rr_NetExpensesOverAssets 0.85%
Expense Example, With Redemption, 1 Year rr_ExpenseExampleYear01 187
Expense Example, With Redemption, 3 Years rr_ExpenseExampleYear03 314
Expense Example, With Redemption, 5 Years rr_ExpenseExampleYear05 560
Expense Example, With Redemption, 10 Years rr_ExpenseExampleYear10 1,265
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 87
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 314
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 560
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 1,265
[1] Expense information has been restated to reflect current fees. Certain Other Expenses of the Fund have increased effective November 1, 2011.
[2] Effective January 1, 2012, Principal Funds Distributor, Inc. ("the Distributor") has contractually agreed to limit the Distribution Fees attributable to Class J through December 31, 2012. The limit will maintain the level of Distribution Fees not to exceed 0.25%. It is expected that the expense limit will continue through the period disclosed; however, Principal Funds, Inc. and the Distributor, the parties to the agreement, may agree to terminate the expense limit prior to the end of the period.