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Shareholders' Equity (Narrative) (Detail) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended
Apr. 01, 2016
Apr. 03, 2015
Aug. 31, 2015
Aug. 31, 2014
2014 Stock Repurchase Program [Member]        
Equity, Class of Stock [Line Items]        
Stock repurchase program approved amount       $ 300.0
Stock Repurchased During Period, Shares   0.5    
Common Stock Acquired, Average Cost Per Share   $ 26.34    
Stock Repurchased During Period, Value   $ 12.6    
2015 Stock Repurchase Program [Member]        
Equity, Class of Stock [Line Items]        
Stock repurchase program approved amount     $ 400.0  
Stock Repurchased During Period, Shares 0.5      
Common Stock Acquired, Average Cost Per Share $ 24.30      
Stock Repurchased During Period, Value $ 12.2      
Stock Repurchase Program, Remaining Authorized Repurchase Amount 237.7      
Retained Earnings [Member]        
Equity, Class of Stock [Line Items]        
Stock Repurchased During Period, Value $ 9.7