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FINANCIAL INSTRUMENTS (Hedging components of other comprehensive income) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Jan. 01, 2017
Disclosure of detailed information about hedges [line items]    
Net gain (loss) on derivatives designated as cash flow hedges $ 60 $ (3)
Cash flow hedges (note 14(d)) (27,071) 39,518
Foreign currency risk    
Disclosure of detailed information about hedges [line items]    
Gains (losses) on cash flow hedges, before tax (6,076) 161
Cash flow hedges (note 14(d)) (4) 19
Foreign currency risk | Net sales    
Disclosure of detailed information about hedges [line items]    
Reclassification adjustments on cash flow hedges, before tax 1,626 19
Foreign currency risk | Cost of sales    
Disclosure of detailed information about hedges [line items]    
Reclassification adjustments on cash flow hedges, before tax (1,042) 0
Foreign currency risk | Selling, general and administrative expenses    
Disclosure of detailed information about hedges [line items]    
Reclassification adjustments on cash flow hedges, before tax (2,087) (668)
Foreign currency risk | Financial expenses, net    
Disclosure of detailed information about hedges [line items]    
Reclassification adjustments on cash flow hedges, before tax 2,234 (1,295)
Commodity risk    
Disclosure of detailed information about hedges [line items]    
Gains (losses) on cash flow hedges, before tax 11,087 33,963
Commodity risk | Inventories    
Disclosure of detailed information about hedges [line items]    
Income Tax Relating To Reclassification Adjustments On Cash Flow Hedges, Before Tax (33,294) (4,356)
Interest rate risk    
Disclosure of detailed information about hedges [line items]    
Gains (losses) on cash flow hedges, before tax $ 425 $ 11,678