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Subsequent Events (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
 1 Months Ended 3 Months Ended 12 Months Ended
Feb. 29, 2012
Feb. 28, 2011
Jul. 31, 2008
Feb. 29, 2008
Dec. 27, 2011
Sep. 28, 2011
Jun. 28, 2011
Mar. 29, 2011
Dec. 27, 2011
Subsequent Events                  
Dividends declared per common share (in dollars per share)         $ 0.08 $ 0.08 $ 0.08 $ 0.08 $ 0.32
Repurchase of common stock authorized by board of directors $ 100.0 $ 50.0 $ 75.0 $ 25.0          
Remaining repurchase authorized amount                 40.9
Dividend declared
                  
Subsequent Events                  
Dividends declared per common share (in dollars per share) $ 0.09                
Repurchase of equity
                  
Subsequent Events                  
Repurchase of common stock authorized by board of directors 100.0                
Remaining repurchase authorized amount                 $ 40.9