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FINANCIAL INSTRUMENTS (Commitments to buy and sell foreign currencies) (Details) - 12 months ended Dec. 30, 2018 - Foreign currency risk - Cash flow hedges
€ in Thousands, £ in Thousands, $ in Thousands, $ in Thousands, $ in Thousands, $ in Thousands
USD ($)
CAD ($)
MXN ($)
EUR (€)
GBP (£)
AUD ($)
Disclosure of detailed information about hedging instruments [line items]            
Notional amount $ 158,308          
Financial assets, carrying value 4,099          
Financial liabilities, carrying value (1,199)          
Net financial assets (liabilities) $ 2,900          
Minimum            
Disclosure of detailed information about hedging instruments [line items]            
Remaining maturity 0 months          
Maximum            
Disclosure of detailed information about hedging instruments [line items]            
Remaining maturity 12 months          
Sell GBP/Buy USD            
Disclosure of detailed information about hedging instruments [line items]            
Notional amount $ 37,703       £ 28,510  
Average exchange rate 1.3224          
Financial assets, carrying value $ 1,366          
Financial liabilities, carrying value 0          
Net financial assets (liabilities) 1,366          
Sell EUR/Buy USD            
Disclosure of detailed information about hedging instruments [line items]            
Notional amount $ 37,551     € 31,578    
Average exchange rate 1.1892          
Financial assets, carrying value $ 1,004          
Financial liabilities, carrying value (19)          
Net financial assets (liabilities) 985          
Sell CAD/Buy USD            
Disclosure of detailed information about hedging instruments [line items]            
Notional amount $ 25,776 $ 33,114        
Average exchange rate 0.7784          
Financial assets, carrying value $ 1,369          
Financial liabilities, carrying value 0          
Net financial assets (liabilities) 1,369          
Buy CAD/Sell USD            
Disclosure of detailed information about hedging instruments [line items]            
Notional amount $ 47,712 $ 62,921        
Average exchange rate 0.7583          
Financial assets, carrying value $ 0          
Financial liabilities, carrying value (1,180)          
Net financial assets (liabilities) (1,180)          
Sell AUD/Buy USD            
Disclosure of detailed information about hedging instruments [line items]            
Notional amount $ 5,800         $ 7,941
Average exchange rate 0.7304          
Financial assets, carrying value $ 198          
Financial liabilities, carrying value 0          
Net financial assets (liabilities) 198          
Buy MXN/Sell USD            
Disclosure of detailed information about hedging instruments [line items]            
Notional amount $ 3,766   $ 79,275      
Average exchange rate 0.0475          
Financial assets, carrying value $ 162          
Financial liabilities, carrying value 0          
Net financial assets (liabilities) $ 162