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FINANCIAL INSTRUMENTS (Financial expenses, net) (Details) - USD ($)
 12 Months Ended
Dec. 29, 2019
Dec. 30, 2018
Financial Instruments [Abstract]    
Interest expense on financial liabilities recorded at amortized cost $ 28,659,000 $ 24,757,000
Bank and other financial charges 8,010,000 7,472,000
Interest accretion on discounted lease obligations 3,141,000  
Interest accretion on discounted provisions 287,000 299,000
Foreign exchange gain (929,000) (1,483,000)
Financial expenses, net (note 14(c)) 39,168,000 31,045,000
Borrowing costs recognised as expense $ 1,300,000.0 $ 700,000