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Risk/Return: rr_RiskReturnAbstract  
Prospectus Date rr_ProspectusDate Feb. 29, 2012
Equity Income Fund formerly Equity Income Fund I (Prospectus Summary): | Equity Income Fund formerly Equity Income Fund I
  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return, Heading rr_RiskReturnHeading Equity Income 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 dividend-paying equity securities. The Fund usually invests in equity securities of companies with large market capitalizations (those included in the S&P 500 Index, which as of December 31, 2011 ranged between $1.57 billion and $401.25 billion), but may also invest in equity securities of companies with medium market capitalizations (those included in the Russell Midcap ® Index, which as of December 31, 2011 ranged between $117 million and $20.51 billion). 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 and securities of foreign issuers.

 
Equity Income Fund formerly Equity Income Fund I | Class R-1 Shares
  
Risk/Return: rr_RiskReturnAbstract  
Trading Symbol dei_TradingSymbol PIEMX
Equity Income Fund formerly Equity Income Fund I | Class R-2 Shares
  
Risk/Return: rr_RiskReturnAbstract  
Trading Symbol dei_TradingSymbol PEINX
Equity Income Fund formerly Equity Income Fund I | Class R-3 Shares
  
Risk/Return: rr_RiskReturnAbstract  
Trading Symbol dei_TradingSymbol PEIOX
Equity Income Fund formerly Equity Income Fund I | Class R-4 Shares
  
Risk/Return: rr_RiskReturnAbstract  
Trading Symbol dei_TradingSymbol PEIPX
Equity Income Fund formerly Equity Income Fund I | Class R-5 Shares
  
Risk/Return: rr_RiskReturnAbstract  
Trading Symbol dei_TradingSymbol PEIQX