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RIGHT-OF-USE ASSETS AND LEASE OBLIGATIONS - ROU ASSETS (Details) - USD ($)
 12 Months Ended
Jan. 03, 2021
Dec. 29, 2019
Dec. 31, 2018
Dec. 30, 2018
Disclosure of quantitative information about right-of-use assets [line items]        
Additions $ 16,424,000 $ 10,342,000    
Write-downs, impairments, and accelerated depreciation (15,862,000) (1,627,000)    
Depreciation of right-of-use assets (note 9) (14,656,000) (13,295,000)    
Right-of-use assets 59,445,000 73,539,000   $ 0
Right-of-use assets 59,445,000 73,539,000   $ 0
Additions 16,424,000 10,342,000    
Terminations of right-of-use assets 15,862,000 1,627,000    
Depreciation of right-of-use assets (note 9) $ 14,656,000 $ 13,295,000    
IFRS 16        
Disclosure of quantitative information about right-of-use assets [line items]        
Right-of-use assets     $ 78,119,000  
Right-of-use assets     $ 78,119,000