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TRADE ACCOUNTS RECEIVABLE (Allowance for doubtful accounts) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 29, 2019
Dec. 30, 2018
Dec. 31, 2018
Jan. 01, 2018
Dec. 31, 2017
Changes in allowance account for credit losses of financial assets [abstract]          
Adjustments relating to initial adoption of new accounting standards (note 2(c))     $ (2,176) $ (1,515)  
Allowance for doubtful accounts          
Changes in allowance account for credit losses of financial assets [abstract]          
Balance, beginning of fiscal year $ (7,547) $ (5,054)      
Adjusted balance, beginning of fiscal year         $ (5,845)
Impairment of trade accounts receivable (27,652) (3,634)      
Write-off of trade accounts receivable 28,015 1,932      
Balance, end of fiscal year $ (7,184) $ (7,547)      
IFRS 9          
Changes in allowance account for credit losses of financial assets [abstract]          
Adjustments relating to initial adoption of new accounting standards (note 2(c))       $ (791)