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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
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