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OTHER NON-CURRENT LIABILITIES (Provisions) (Details)
$ in Thousands
 12 Months Ended
Dec. 29, 2019
USD ($)
Reconciliation of changes in other provisions [abstract]  
Balance, January 1, 2018 $ 14,343
Impact of initial adoption of IFRS 16 (note 2(c)) (4,619)
Changes in estimates made during the fiscal year 779
Accretion of interest 287
Balance, December 31, 2018 $ 10,790
Expected Timing Of Outflows, Other Provisions 20 years
Decommissioning and site restoration costs  
Reconciliation of changes in other provisions [abstract]  
Balance, January 1, 2018 $ 9,724
Impact of initial adoption of IFRS 16 (note 2(c)) 0
Changes in estimates made during the fiscal year 779
Accretion of interest 287
Balance, December 31, 2018 10,790
Lease exit costs  
Reconciliation of changes in other provisions [abstract]  
Balance, January 1, 2018 4,619
Impact of initial adoption of IFRS 16 (note 2(c)) (4,619)
Changes in estimates made during the fiscal year 0
Accretion of interest 0
Balance, December 31, 2018 $ 0