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Share-Based Payments Narrative (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended9 Months Ended
Sep. 24, 2011
Sep. 25, 2010
Sep. 24, 2011
years
Sep. 25, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Mark-to-market stock-based compensation (benefit) expense, before tax (in dollars)$ 0$ 0.7$ 0.1$ 1.8
Total unrecognized compensation expense related to non-vested shares from share-based compensation arrangements (in dollars)$ 30.0 $ 30.0 
Weighted-average period over which compensation expense is expected to be recognized (in years)  1.4 
Options and Sosars [Member]
    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Granted (in shares)  0.7 
Rsus and Dsus [Member]
    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Granted (in shares)  0.3 
PUs [Member]
    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Granted (in shares)  0.6 
Class B common stock, non-voting
    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock approved by Board of Directors and available for issuance (in shares)3.6 3.6