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FINANCIAL INSTRUMENTS (Hedging components of other comprehensive income) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 29, 2019
Dec. 30, 2018
Disclosure of detailed information about hedges [line items]    
Net gain (loss) on derivatives designated as cash flow hedges $ (46) $ (67)
Cash flow hedges (note 14(d)) (3,917) (10,158)
Foreign currency risk    
Disclosure of detailed information about hedges [line items]    
Gains (losses) on cash flow hedges, before tax 4,566 6,740
Cash flow hedges (note 14(d)) 60 16
Foreign currency risk | Net sales    
Disclosure of detailed information about hedges [line items]    
Reclassification adjustments on cash flow hedges, before tax (5,667) (1,864)
Foreign currency risk | Cost of sales    
Disclosure of detailed information about hedges [line items]    
Reclassification adjustments on cash flow hedges, before tax (350) (307)
Foreign currency risk | Selling, general and administrative expenses    
Disclosure of detailed information about hedges [line items]    
Reclassification adjustments on cash flow hedges, before tax 417 51
Foreign currency risk | Financial expenses, net    
Disclosure of detailed information about hedges [line items]    
Reclassification adjustments on cash flow hedges, before tax (752) (2,224)
Commodity risk    
Disclosure of detailed information about hedges [line items]    
Gains (losses) on cash flow hedges, before tax (8,213) 698
Commodity risk | Inventories    
Disclosure of detailed information about hedges [line items]    
Income Tax Relating To Reclassification Adjustments On Cash Flow Hedges, Before Tax 16,656 (13,303)
Interest rate risk    
Disclosure of detailed information about hedges [line items]    
Gains (losses) on cash flow hedges, before tax $ (10,588) $ 102