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Label Element Value
Risk/Return: rr_RiskReturnAbstract  
Prospectus Date rr_ProspectusDate Mar. 01, 2011
SmallCap Blend Fund (Prospectus Summary): | SmallCap Blend Fund
  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return, Heading rr_RiskReturnHeading SMALLCAP BLEND FUND    
Supplement Text ck0000898745_SupplementTextBlock

 

 

 

Supplement dated December 16, 2011

to the Class J Prospectus

for Principal Funds, Inc.

dated March 1, 2011

 

(as supplemented on March 14, 2011, June 16, 2011, July 20, 2011, August 29, 2011,

September 16, 2011, and October 31, 2011)

 

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

 
Operating Expenses Heading ck0000898745_OperatingExpensesHeading

Delete the Annual Fund Operating Expenses table and substitute:  

 
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 year ended October 31, 2010  
Expense Example Sub Heading ck0000898745_ExpenseExampleSubHeading

Delete the Example and substitute
Expense Example, Heading rr_ExpenseExampleHeading Example
Expense Example, Narrative 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.  

  

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:  

 
Expense Example, No Redemption, By Year, Caption rr_ExpenseExampleNoRedemptionByYearCaption You would pay the following expenses if you did not redeem your shares:    
SmallCap Blend Fund | Class J
  
Risk/Return: rr_RiskReturnAbstract  
Trading Symbol dei_TradingSymbol PSBJX
Management Fees rr_ManagementFeesOverAssets 0.75%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.45%
Other Expenses rr_OtherExpensesOverAssets 0.22%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.05%
Total Annual Fund Operating Expenses rr_NetExpensesOverAssets 1.47%
Expense Example, With Redemption, 1 Year rr_ExpenseExampleYear01 250
Expense Example, With Redemption, 3 Years rr_ExpenseExampleYear03 465
Expense Example, With Redemption, 5 Years rr_ExpenseExampleYear05 803
Expense Example, With Redemption, 10 Years rr_ExpenseExampleYear10 1,757
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 150
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 465
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 803
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 1,757