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FINANCIAL INSTRUMENTS (Floating-to-fixed interest rate swap contracts outstanding) (Details) - Cash flow hedges - Interest rate risk - USD ($) | Dec. 29, 2019 | Dec. 30, 2018
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Disclosure of detailed information about hedging instruments [line items] |  |
Notional amount | $ 250,000,000 |
Floating-to-fixed interest rate swap, maturing on June 17, 2021 |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Notional amount | 150,000,000 | $ 150,000,000
Floating-to-fixed interest rate swap, maturing on April 30, 2023 |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Notional amount | 75,000,000 | 75,000,000
Floating-to-fixed interest rate swap, maturing on August 30, 2024 |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Notional amount | 50,000,000 |
Floating-to-fixed interest rate swap, maturing on August 25, 2023 |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Notional amount | 50,000,000 | 50,000,000
Floating-to-fixed interest rate swap, maturing on August 25, 2026 |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Notional amount | $ 50,000,000 | $ 50,000,000
Fixed rate | Floating-to-fixed interest rate swap, maturing on June 17, 2021 |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Interest rate | 0.96% | 0.96%
Fixed rate | Floating-to-fixed interest rate swap, maturing on April 30, 2023 |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Interest rate | 2.85% | 2.85%
Fixed rate | Floating-to-fixed interest rate swap, maturing on August 30, 2024 |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Interest rate | 1.51% |
Fixed rate | Floating-to-fixed interest rate swap, maturing on August 25, 2023 |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Interest rate | 1.18% | 1.18%
Fixed rate | Floating-to-fixed interest rate swap, maturing on August 25, 2026 |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Interest rate | 1.34% | 1.34%
Financial assets included in prepaid expenses, deposits and other current assets |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Financial assets, carrying value | $ 3,676,000 | $ 12,952,000
Financial assets included in prepaid expenses, deposits and other current assets | Floating-to-fixed interest rate swap, maturing on June 17, 2021 |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Financial assets, carrying value | 1,379,000 | 5,500,000
Financial assets included in prepaid expenses, deposits and other current assets | Floating-to-fixed interest rate swap, maturing on April 30, 2023 |  |
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 | Floating-to-fixed interest rate swap, maturing on August 30, 2024 |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Financial assets, carrying value | 252,000 |
Financial assets included in prepaid expenses, deposits and other current assets | Floating-to-fixed interest rate swap, maturing on August 25, 2023 |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Financial assets, carrying value | 866,000 | 3,070,000
Financial assets included in prepaid expenses, deposits and other current assets | Floating-to-fixed interest rate swap, maturing on August 25, 2026 |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Financial assets, carrying value | 1,179,000 | 4,382,000
Accounts payable and accrued liabilities (1) |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Financial assets, carrying value | (2,059,000) | (521,000)
Accounts payable and accrued liabilities (1) | Floating-to-fixed interest rate swap, maturing on June 17, 2021 |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Financial assets, carrying value | 0 | 0
Accounts payable and accrued liabilities (1) | Floating-to-fixed interest rate swap, maturing on April 30, 2023 |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Financial assets, carrying value | (1,817,000) | (521,000)
Accounts payable and accrued liabilities (1) | Floating-to-fixed interest rate swap, maturing on August 30, 2024 |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Financial assets, carrying value | (242,000) |
Accounts payable and accrued liabilities (1) | Floating-to-fixed interest rate swap, maturing on August 25, 2023 |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Financial assets, carrying value | 0 | 0
Accounts payable and accrued liabilities (1) | Floating-to-fixed interest rate swap, maturing on August 25, 2026 |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Financial assets, carrying value | $ 0 | $ 0

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- Definition The amount of a hedging instrument, recognised as an asset. [Refer: Hedging instruments [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph 24A -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_24A_a&doctype=Standard -URIDate 2019-03-27 + Details
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