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FINANCIAL INSTRUMENTS (Commodity contracts outstanding) (Details) - Commodity risk - Cash flow hedges
$ in Thousands
 12 Months Ended
Dec. 29, 2019
USD ($)
pound
barrel
Dec. 30, 2018
USD ($)
pound
barrel
Disclosure of detailed information about hedging instruments [line items]    
Financial assets, fair value $ (2,564) $ (10,677)
Forward contracts    
Disclosure of detailed information about hedging instruments [line items]    
Nominal amount of hedging instrument | pound 133,700 76,000
Financial assets, fair value $ 3,296 $ (2,837)
Swap contracts    
Disclosure of detailed information about hedging instruments [line items]    
Nominal amount of hedging instrument | pound 60,600 147,700
Financial assets, fair value $ (6,859) $ (5,516)
Swap And Option Contract    
Disclosure of detailed information about hedging instruments [line items]    
Nominal amount of hedging instrument | barrel 202,400 290,000
Financial assets, fair value $ 999 $ (2,324)
Minimum    
Disclosure of detailed information about hedging instruments [line items]    
Remaining maturity 0 years 0 months
Maximum    
Disclosure of detailed information about hedging instruments [line items]    
Remaining maturity 12 years 12 months
Accounts payable and accrued liabilities (1)    
Disclosure of detailed information about hedging instruments [line items]    
Financial assets, carrying value $ (7,243) $ (11,158)
Accounts payable and accrued liabilities (1) | Forward contracts    
Disclosure of detailed information about hedging instruments [line items]    
Financial assets, carrying value (198) (3,173)
Accounts payable and accrued liabilities (1) | Swap contracts    
Disclosure of detailed information about hedging instruments [line items]    
Financial assets, carrying value (6,859) (5,516)
Accounts payable and accrued liabilities (1) | Swap And Option Contract    
Disclosure of detailed information about hedging instruments [line items]    
Financial assets, carrying value (186) (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 4,679 481
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 3,494 336
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 0
Financial assets included in prepaid expenses, deposits and other current assets | Swap And Option Contract    
Disclosure of detailed information about hedging instruments [line items]    
Financial assets, carrying value $ 1,185 $ 145