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FINANCIAL INSTRUMENTS (Commitments to buy and sell foreign currencies) (Details) - Foreign currency risk - Cash flow hedges € in Thousands, £ in Thousands, $ in Thousands, $ in Thousands, $ in Thousands, $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 29, 2019 USD ($) | Dec. 30, 2018 USD ($) | Dec. 29, 2019 CAD ($) | Dec. 29, 2019 MXN ($) | Dec. 29, 2019 EUR (€) | Dec. 29, 2019 GBP (£) | Dec. 29, 2019 AUD ($) | Dec. 30, 2018 CAD ($) | Dec. 30, 2018 MXN ($) | Dec. 30, 2018 EUR (€) | Dec. 30, 2018 GBP (£) | Dec. 30, 2018 AUD ($)
Disclosure of detailed information about hedging instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |
Notional amount | $ 168,643 | $ 158,308 |  |  |  |  |  |  |  |  |  |
Financial assets, carrying value | 1,118 | 4,099 |  |  |  |  |  |  |  |  |  |
Financial liabilities, carrying value | (1,765) | (1,199) |  |  |  |  |  |  |  |  |  |
Net financial assets (liabilities) | $ (647) | $ 2,900 |  |  |  |  |  |  |  |  |  |
Minimum |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |
Remaining maturity | 0 months | 0 months |  |  |  |  |  |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |
Remaining maturity | 12 months | 12 months |  |  |  |  |  |  |  |  |  |
Sell GBP/Buy USD |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |
Notional amount | $ 41,739 | $ 37,703 |  |  |  | £ 32,737 |  |  |  |  | £ 28,510 |
Average exchange rate | 1.2750 | 1.3224 |  |  |  |  |  |  |  |  |  |
Financial assets, carrying value | $ 187 | $ 1,366 |  |  |  |  |  |  |  |  |  |
Financial liabilities, carrying value | (1,169) | 0 |  |  |  |  |  |  |  |  |  |
Net financial assets (liabilities) | (982) | 1,366 |  |  |  |  |  |  |  |  |  |
Sell EUR/Buy USD |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |
Notional amount | $ 39,960 | $ 37,551 |  |  | € 35,236 |  |  |  |  | € 31,578 |  |
Average exchange rate | 1.1341 | 1.1892 |  |  |  |  |  |  |  |  |  |
Financial assets, carrying value | $ 502 | $ 1,004 |  |  |  |  |  |  |  |  |  |
Financial liabilities, carrying value | (78) | (19) |  |  |  |  |  |  |  |  |  |
Net financial assets (liabilities) | 424 | 985 |  |  |  |  |  |  |  |  |  |
Sell CAD/Buy USD |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |
Notional amount | $ 44,309 | $ 25,776 | $ 58,212 |  |  |  |  | $ 33,114 |  |  |  |
Average exchange rate | 0.7612 | 0.7784 |  |  |  |  |  |  |  |  |  |
Financial assets, carrying value | $ 49 | $ 1,369 |  |  |  |  |  |  |  |  |  |
Financial liabilities, carrying value | (130) | 0 |  |  |  |  |  |  |  |  |  |
Net financial assets (liabilities) | (81) | 1,369 |  |  |  |  |  |  |  |  |  |
Buy CAD/Sell USD |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |
Notional amount | $ 23,510 | $ 47,712 | $ 31,287 |  |  |  |  | $ 62,921 |  |  |  |
Average exchange rate | 0.7514 | 0.7583 |  |  |  |  |  |  |  |  |  |
Financial assets, carrying value | $ 342 | $ 0 |  |  |  |  |  |  |  |  |  |
Financial liabilities, carrying value | 0 | (1,180) |  |  |  |  |  |  |  |  |  |
Net financial assets (liabilities) | 342 | (1,180) |  |  |  |  |  |  |  |  |  |
Sell AUD/Buy USD |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |
Notional amount | $ 5,364 | $ 5,800 |  |  |  |  | $ 7,691 |  |  |  |  | $ 7,941
Average exchange rate | 0.6974 | 0.7304 |  |  |  |  |  |  |  |  |  |
Financial assets, carrying value | $ 38 | $ 198 |  |  |  |  |  |  |  |  |  |
Financial liabilities, carrying value | (32) | 0 |  |  |  |  |  |  |  |  |  |
Net financial assets (liabilities) | 6 | 198 |  |  |  |  |  |  |  |  |  |
Sell MXN/Buy USD |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |
Notional amount | $ 13,761 | $ 3,766 |  | $ 272,914 |  |  |  |  | $ 79,275 |  |  |
Average exchange rate | 0.0504 | 0.0475 |  |  |  |  |  |  |  |  |  |
Financial assets, carrying value | $ 0 | $ 162 |  |  |  |  |  |  |  |  |  |
Financial liabilities, carrying value | (356) | 0 |  |  |  |  |  |  |  |  |  |
Net financial assets (liabilities) | $ (356) | $ 162 |  |  |  |  |  |  |  |  |  |

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