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FINANCIAL INSTRUMENTS (Financial expenses, net) (Details) - USD ($)
 12 Months Ended
Dec. 30, 2018
Dec. 31, 2017
Financial Instruments [Abstract]    
Interest expense on financial liabilities recorded at amortized cost $ 24,757,000 $ 17,126,000
Bank and other financial charges 7,472,000 8,025,000
Interest accretion on discounted provisions 299,000 311,000
Foreign exchange gain (1,483,000) (1,276,000)
Financial expenses, net (note 14(c)) 31,045,000 24,186,000
Borrowing costs recognised as expense $ 700,000.0 $ 1,200,000