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Shareholders' Equity (Narrative) (Detail) - USD ($)
$ / shares in Units, $ in Millions
6 Months Ended
Jul. 03, 2015
Jul. 04, 2014
Aug. 31, 2014
Equity, Class of Stock [Line Items]      
Stock repurchased during period, shares 0 0  
Stock Repurchased and Retired During Period, Shares 2,900,000 0  
Common Stock Acquired and Retired, Average Cost Per Share $ 24.74    
Stock Repurchased and Retired During Period, Value $ 73.0    
Restricted Stock Units (RSUs) [Member]      
Equity, Class of Stock [Line Items]      
Restricted Stock Unit Award Vesting Period 3 years    
2014 Stock Repurchase Program [Member]      
Equity, Class of Stock [Line Items]      
Stock repurchase program approved amount     $ 300.0
Stock Repurchase Program, Remaining Authorized Repurchase Amount $ 177.0    
Retained Earnings [Member]      
Equity, Class of Stock [Line Items]      
Stock Repurchased and Retired During Period, Value $ 58.9    
Minimum | Employee Stock Option [Member]      
Equity, Class of Stock [Line Items]      
Restricted Stock Unit Award Vesting Period 4 years    
Maximum | Employee Stock Option [Member]      
Equity, Class of Stock [Line Items]      
Restricted Stock Unit Award Vesting Period 5 years