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Risk/Return: rr_RiskReturnAbstract  
Prospectus Date rr_ProspectusDate Feb. 29, 2012
MidCap Value Fund I (Prospectus Summary): | MidCap Value Fund I
  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return, Heading rr_RiskReturnHeading MidCap Value Fund I  
Supplement Text ck0000898745_SupplementTextBlock

 

Supplement dated September 14, 2012

to the Class R-1, Class R-2, Class R-3, Class R-4 and Class R-5 Shares Prospectus

for Principal Funds, Inc.

dated February 29, 2012

 

(as supplemented on March 16, 2012, April 23, 2012, June 15, 2012, and July 17, 2012)

 

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

 

FUND SUMMARIES

 
Investment Strategy, Heading rr_StrategyHeading Under the Principal Investment Strategies heading, delete the first paragraph and substitute:  
Investment Strategy, Narrative rr_StrategyNarrativeTextBlock

Under normal circumstances, the Fund invests at least 80% of its net assets, plus any borrowings for investment purposes, in a diversified portfolio of equity securities of companies with a medium market capitalization (those with market capitalizations similar to companies in the Russell Midcap ® Value Index (as of December 31, 2011, the range was between approximately $117 million and $20.51 billion)) at the time of purchase. The Fund invests in value equity securities, an investment strategy that emphasizes buying equity securities that appear to be undervalued. The Fund will also invest in real estate investment trusts.

 
MidCap Value Fund I | R-2
  
Risk/Return: rr_RiskReturnAbstract  
Trading Symbol dei_TradingSymbol PABUX
MidCap Value Fund I | R-3
  
Risk/Return: rr_RiskReturnAbstract  
Trading Symbol dei_TradingSymbol PMPRX
MidCap Value Fund I | R-5
  
Risk/Return: rr_RiskReturnAbstract  
Trading Symbol dei_TradingSymbol PABVX
MidCap Value Fund I | R-4
  
Risk/Return: rr_RiskReturnAbstract  
Trading Symbol dei_TradingSymbol PABWX
MidCap Value Fund I | R-1
  
Risk/Return: rr_RiskReturnAbstract  
Trading Symbol dei_TradingSymbol PLASX