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Stockholder's Equity (Narrative) (Details) (USD $)
In Millions, except Share data, unless otherwise specified
0 Months Ended 3 Months Ended 9 Months Ended 14 Months Ended
Nov. 04, 2010
Dec. 31, 2011
Dec. 25, 2010
Dec. 31, 2011
Dec. 25, 2010
Dec. 31, 2011
Stockholder's Equity [Abstract]            
Shares of common stock issued for stock option exercises   102,000 400,000 261,000 3,700,000  
Share repurchase program, amount approved $ 80          
Shares repurchased       4,900,000   5,100,000
Shares repurchased, value       76.8   79.5
Average cost per share repurchased       $ 15.63   $ 15.51
Remaining amount available for share repurchases under stock repurchase program       $ 0.5