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FINANCIAL INSTRUMENTS (Carrying amounts and fair values) (Details) - USD ($)
$ in Thousands
Dec. 30, 2018
Dec. 31, 2017
Disclosure Of Financial Assets And Liabilities [Line Items]    
Financing arrangements $ 33,000 $ 0
Financial liabilities at amortised cost | Accounts payable and accrued liabilities (1)    
Disclosure Of Financial Assets And Liabilities [Line Items]    
Financial liabilities, carrying value 332,543 255,832
Financial liabilities, fair value 255,832 231,927
Financial liabilities at amortised cost | Long-term debt | Effective interest rate    
Disclosure Of Financial Assets And Liabilities [Line Items]    
Financial liabilities, carrying value 469,000 430,000
Financial liabilities, fair value 430,000 400,000
Financial liabilities at amortised cost | Long-term debt | Fixed interest rate    
Disclosure Of Financial Assets And Liabilities [Line Items]    
Financial liabilities, carrying value 200,000 200,000
Financial liabilities, fair value 189,500 197,600
Derivative financial liabilities included in accounts payable and accrued liabilities    
Disclosure Of Financial Assets And Liabilities [Line Items]    
Financial liabilities, carrying value 14,442 2,644
Financial liabilities, fair value 2,644 1,515
Derivative financial instruments included in accounts payable and accrued liabilities - total return swap    
Disclosure Of Financial Assets And Liabilities [Line Items]    
Financial liabilities, fair value 0 620
Financial assets at amortised cost | Cash and cash equivalents    
Disclosure Of Financial Assets And Liabilities [Line Items]    
Financial assets 46,657 52,795
Financial assets, fair value 52,795 38,197
Financial assets at amortised cost | Trade accounts receivable    
Disclosure Of Financial Assets And Liabilities [Line Items]    
Financial assets 317,159 243,365
Financial assets, fair value 243,365 277,733
Financial assets at amortised cost | Financial assets included in prepaid expenses, deposits and other current assets    
Disclosure Of Financial Assets And Liabilities [Line Items]    
Financial assets 39,789 28,711
Financial assets, fair value 28,711 22,722
Financial assets at amortised cost | Long-term non-trade receivables included in other non-current assets    
Disclosure Of Financial Assets And Liabilities [Line Items]    
Financial assets 2,771 2,781
Financial assets, fair value 2,781 476
Derivative financial assets included in prepaid expenses, deposits and other current assets    
Disclosure Of Financial Assets And Liabilities [Line Items]    
Financial assets 17,792 16,920
Financial assets, fair value 15,688 32,572
Derivative financial instruments included in prepaid expenses, deposits and other current assets - total return swap    
Disclosure Of Financial Assets And Liabilities [Line Items]    
Financial assets, fair value $ 1,232 $ 0