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FINANCIAL INSTRUMENTS (Commodity contracts outstanding) (Details) - Commodity risk - Cash flow hedges
barrel in Thousands, $ in Thousands
 12 Months Ended
Dec. 30, 2018
USD ($)
pound
barrel
Disclosure of detailed information about hedging instruments [line items]  
Financial assets, fair value $ (10,677)
Forward contracts  
Disclosure of detailed information about hedging instruments [line items]  
Nominal amount of hedging instrument | pound 76,000
Financial assets, fair value $ (2,837)
Swap contracts  
Disclosure of detailed information about hedging instruments [line items]  
Nominal amount of hedging instrument | pound 147,680
Financial assets, fair value $ (5,516)
Swap And Option Contract [Member]  
Disclosure of detailed information about hedging instruments [line items]  
Nominal amount of hedging instrument | barrel 0
Financial assets, fair value $ (2,324)
Minimum  
Disclosure of detailed information about hedging instruments [line items]  
Remaining maturity 0 years
Maximum  
Disclosure of detailed information about hedging instruments [line items]  
Remaining maturity 12 years
Accounts payable and accrued liabilities (1)  
Disclosure of detailed information about hedging instruments [line items]  
Financial assets, carrying value $ (11,158)
Accounts payable and accrued liabilities (1) | Forward contracts  
Disclosure of detailed information about hedging instruments [line items]  
Financial assets, carrying value (3,173)
Accounts payable and accrued liabilities (1) | Swap contracts  
Disclosure of detailed information about hedging instruments [line items]  
Financial assets, carrying value (5,516)
Accounts payable and accrued liabilities (1) | Swap And Option Contract [Member]  
Disclosure of detailed information about hedging instruments [line items]  
Financial assets, carrying value (2,469)
Financial assets included in prepaid expenses, deposits and other current assets  
Disclosure of detailed information about hedging instruments [line items]  
Financial assets, carrying value 481
Financial assets included in prepaid expenses, deposits and other current assets | Forward contracts  
Disclosure of detailed information about hedging instruments [line items]  
Financial assets, carrying value 336
Financial assets included in prepaid expenses, deposits and other current assets | Swap contracts  
Disclosure of detailed information about hedging instruments [line items]  
Financial assets, carrying value 0
Financial assets included in prepaid expenses, deposits and other current assets | Swap And Option Contract [Member]  
Disclosure of detailed information about hedging instruments [line items]  
Financial assets, carrying value $ 145