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Earnings Per Share (Narrative) (Details) (USD $)
In Millions, except Per Share data
3 Months Ended9 Months Ended
Sep. 24, 2011
Sep. 25, 2010
Sep. 24, 2011
Sep. 25, 2010
Earnings Per Share Basic and Diluted [Line Items]    
Basic earnings per share$ 0.29$ 0.12$ 0.17$ 0.10
Diluted earnings per share$ 0.28   
Nonvested shares and options outstanding12.4 12.4 
Options and nonvested shares excluded from computation of diluted EPS 13.2 13.5
Effect on diluted weighted average share amount, assumed tax benefits  0 
Stock Options [Member]
    
Earnings Per Share Basic and Diluted [Line Items]    
Nonvested shares and options outstanding16.0 16.0 
Redeemable Preferred Stock [Member]
    
Earnings Per Share Basic and Diluted [Line Items]    
Basic earnings per share$ 0.29   
Basic EPS, distributed$ 0.13   
Basic EPS, undistributed$ 0.16