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Financial Instruments and Risk Management (Effect of cash flow hedge derivative instruments) (Detail) - Foreign Exchange Contract - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Apr. 01, 2017
Derivatives, Fair Value [Line Items]    
Amount of Gain (Loss) Recognized in Accumulated Other Comprehensive Loss (Effective Portion) $ (1,708) $ (18,114)
Cost of Sales    
Derivatives, Fair Value [Line Items]    
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Loss into Income (Effective Portion) $ (1,665) $ 298