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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

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