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FINANCIAL INSTRUMENTS (Carrying amounts and fair values) (Details) - USD ($)
$ in Thousands
Dec. 29, 2019
Dec. 30, 2018
Dec. 31, 2017
Disclosure Of Financial Assets And Liabilities [Line Items]      
Cash and cash equivalents (note 5) $ 64,126 $ 46,657 $ 52,795
Trade accounts receivable (note 6) 320,931 317,159  
Financing arrangements 39,600 33,000  
Financial liabilities at amortised cost | Accounts payable and accrued liabilities (1)      
Disclosure Of Financial Assets And Liabilities [Line Items]      
Financial liabilities, carrying value 395,564 332,543  
Financial liabilities, fair value 395,564 332,543  
Financial liabilities at amortised cost | Long-term debt | Effective interest rate      
Disclosure Of Financial Assets And Liabilities [Line Items]      
Financial liabilities, carrying value 645,000 469,000  
Financial liabilities, fair value 645,000 469,000  
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 206,400 189,500  
Derivative financial liabilities included in accounts payable and accrued liabilities      
Disclosure Of Financial Assets And Liabilities [Line Items]      
Financial liabilities, carrying value 11,067 14,442  
Financial liabilities, fair value 11,067 14,442  
Financial assets at amortised cost | Cash and cash equivalents      
Disclosure Of Financial Assets And Liabilities [Line Items]      
Cash and cash equivalents (note 5) 64,126 46,657  
Financial assets, fair value 64,126 46,657  
Financial assets at amortised cost | Trade accounts receivable      
Disclosure Of Financial Assets And Liabilities [Line Items]      
Trade accounts receivable (note 6) 320,931 317,159  
Financial assets, fair value 320,931 317,159  
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 45,950 39,789  
Financial assets, fair value 45,950 39,789  
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 2,933 2,771  
Financial assets, fair value 2,933 2,771  
Derivative financial assets included in prepaid expenses, deposits and other current assets      
Disclosure Of Financial Assets And Liabilities [Line Items]      
Financial assets 9,816 17,792  
Financial assets, fair value 9,816 17,792  
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