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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 6 Months Ended
Jun. 30, 2018
Jul. 01, 2017
Jun. 30, 2018
Jul. 01, 2017
Derivatives, Fair Value [Line Items]        
Amount of Gain (Loss) Recognized in Accumulated Other Comprehensive Loss (Effective Portion) $ 26,982 $ (8,167) $ 25,274 $ (26,281)
Cost of Sales        
Derivatives, Fair Value [Line Items]        
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Loss into Income (Effective Portion) $ (5,554) $ 2,636 $ (7,219) $ 2,934