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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)

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