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Financial Instruments and Risk Management (Fair Values of Derivative Instruments) (Detail) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 30, 2017
Derivatives, Fair Value [Line Items]    
Fair value of assets and liabilities $ 21,012 $ (20,968)
Other current assets    
Derivatives, Fair Value [Line Items]    
Total derivative assets 22,447 1,600
Other current assets | Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Total derivative assets 18,325 1,464
Other current assets | Non-hedges    
Derivatives, Fair Value [Line Items]    
Total derivative assets 4,122 136
Accrued liabilities    
Derivatives, Fair Value [Line Items]    
Total derivative liabilities 1,435 22,568
Accrued liabilities | Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Total derivative liabilities 732 14,750
Accrued liabilities | Non-hedges    
Derivatives, Fair Value [Line Items]    
Total derivative liabilities $ 703 $ 7,818