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FINANCIAL INSTRUMENTS (Hedging components of other comprehensive income) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 30, 2018
Dec. 31, 2017
Disclosure of detailed information about hedges [line items]    
Net gain (loss) on derivatives designated as cash flow hedges $ (67) $ 60
Cash flow hedges (note 14(d)) (10,158) (27,071)
Foreign currency risk    
Disclosure of detailed information about hedges [line items]    
Gains (losses) on cash flow hedges, before tax 6,740 (6,076)
Cash flow hedges (note 14(d)) 16 (4)
Foreign currency risk | Net sales    
Disclosure of detailed information about hedges [line items]    
Reclassification adjustments on cash flow hedges, before tax (1,864) 1,626
Foreign currency risk | Cost of sales    
Disclosure of detailed information about hedges [line items]    
Reclassification adjustments on cash flow hedges, before tax (307) (1,042)
Foreign currency risk | Selling, general and administrative expenses    
Disclosure of detailed information about hedges [line items]    
Reclassification adjustments on cash flow hedges, before tax 51 (2,087)
Foreign currency risk | Financial expenses, net    
Disclosure of detailed information about hedges [line items]    
Reclassification adjustments on cash flow hedges, before tax (2,224) 2,234
Commodity risk    
Disclosure of detailed information about hedges [line items]    
Gains (losses) on cash flow hedges, before tax 698 11,087
Commodity risk | Inventories    
Disclosure of detailed information about hedges [line items]    
Income Tax Relating To Reclassification Adjustments On Cash Flow Hedges, Before Tax (13,303) (33,294)
Interest rate risk    
Disclosure of detailed information about hedges [line items]    
Gains (losses) on cash flow hedges, before tax $ 102 $ 425