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Financial Instruments and Risk Management (Effect of mark to market hedge derivative instruments on Condensed Consolidated Statements of Income) (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Apr. 01, 2017
Derivative Instruments, Gain (Loss) [Line Items]    
Amount of Gain (Loss) Recognized in Income $ 9,403 $ (4,264)
Foreign Exchange Contract | Cost of Sales    
Derivative Instruments, Gain (Loss) [Line Items]    
Amount of Gain (Loss) Recognized in Income 9,100 0
Foreign Exchange Contract | Selling, General and Administrative Expenses    
Derivative Instruments, Gain (Loss) [Line Items]    
Amount of Gain (Loss) Recognized in Income $ 303 $ (4,264)