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Earnings per Share (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 6 Months Ended 29 Months Ended
Jul. 03, 2016
Jun. 28, 2015
Jul. 03, 2016
Jun. 28, 2015
Sep. 30, 2015
Jul. 27, 2015
Apr. 30, 2013
Net (loss) income              
Net income $ 28.6 $ 19.3 $ 44.8 $ 30.9      
Shares              
Shares (in shares) 34,500,000 35,000,000 34,400,000 35,100,000      
Per Share Amount              
Net income (in dollars per share) $ 0.83 $ 0.55 $ 1.30 $ 0.88      
Dilutive securities, principally common stock options              
Common stock equivalents (in shares)   100,000 100,000        
Net (loss) income              
Net income $ 28.6 $ 19.3 $ 44.8 $ 30.9      
Weighted average number of shares:              
Shares (in shares) 34,500,000 35,100,000 34,500,000 35,100,000      
Per Share Amount              
Net income (in dollars per share) $ 0.83 $ 0.55 $ 1.30 $ 0.88      
Shares repurchased              
Options to purchase shares of Class A common stock 100,000 300,000 200,000 300,000      
Total value of shares of the entity's Class A common stock authorized to be repurchased           $ 100.0 $ 90.0
Number of shares repurchased 91,500 185,000 359,000 349,000      
Cost of shares repurchased $ 5.2 $ 10.1 $ 17.6 $ 19.5      
April 30, 2013              
Shares repurchased              
Number of shares repurchased   185,000   349,000      
Cost of shares repurchased   $ 10.1   $ 19.5 $ 90.0    
July 27, 2015              
Shares repurchased              
Number of shares repurchased 91,500   359,000        
Cost of shares repurchased $ 5.2   $ 17.6        
Remaining authorized repurchase amount $ 65.1   $ 65.1