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Risk/Return: rr_RiskReturnAbstract  
Prospectus Date rr_ProspectusDate Feb. 29, 2012
LargeCap Growth Fund (Prospectus Summary): | LargeCap Growth Fund
  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return, Heading rr_RiskReturnHeading LargeCap Growth Fund  
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 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 equity securities of companies with large market capitalizations (those with market capitalizations similar to companies in the Russell 1000 ® Growth Index (as of December 31, 2011, this range was between approximately $117 million and $401.25 billion)) at the time of purchase. The Fund invests in growth equity securities; growth orientation emphasizes buying equity securities of companies whose potential for growth of capital and earnings is expected to be above average.

 
LargeCap Growth Fund | R-2
  
Risk/Return: rr_RiskReturnAbstract  
Trading Symbol dei_TradingSymbol PCPPX
LargeCap Growth Fund | R-3
  
Risk/Return: rr_RiskReturnAbstract  
Trading Symbol dei_TradingSymbol PLGPX
LargeCap Growth Fund | R-5
  
Risk/Return: rr_RiskReturnAbstract  
Trading Symbol dei_TradingSymbol PDPPX
LargeCap Growth Fund | R-4
  
Risk/Return: rr_RiskReturnAbstract  
Trading Symbol dei_TradingSymbol PEPPX
LargeCap Growth Fund | R-1
  
Risk/Return: rr_RiskReturnAbstract  
Trading Symbol dei_TradingSymbol PLSGX