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RIGHT-OF-USE ASSETS AND LEASE OBLIGATIONS - ROU ASSETS (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 29, 2019
Dec. 31, 2018
Dec. 30, 2018
Disclosure of quantitative information about right-of-use assets [line items]      
Additions $ 10,342    
Terminations (1,627)    
Depreciation of right-of-use assets (note 9) (13,295)    
Right-of-use assets $ 73,539   $ 0
IFRS 16      
Disclosure of quantitative information about right-of-use assets [line items]      
Right-of-use assets   $ 78,100