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FINANCIAL INSTRUMENTS (Hedging components of other comprehensive income) (Details) - USD ($) $ in Thousands | 12 Months Ended
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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

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