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TRADE ACCOUNTS RECEIVABLE (Allowance for doubtful accounts) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 30, 2018
Dec. 31, 2017
Jan. 01, 2018
Disclosure Of Trade Receivables [Line Items]      
Impact of initial application of new IFRS on retained earnings     $ (791)
Allowance for doubtful accounts      
Disclosure Of Trade Receivables [Line Items]      
Allowance Account For Credit Losses Of Financial Assets, Adjusted   $ (5,845)  
Changes in allowance account for credit losses of financial assets [abstract]      
Balance, beginning of fiscal year $ (5,054) (5,589)  
Bad debt expense (3,634) (3,689)  
Write-off of trade accounts receivable 1,932 4,224  
Balance, end of fiscal year $ (7,547) $ (5,054)  
IFRS 9 [Member]      
Disclosure Of Trade Receivables [Line Items]      
Impact of initial application of new IFRS on retained earnings     $ (800)