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SHARE-BASED COMPENSATION (Stock options and restricted share units Narrative) (Details)
 12 Months Ended
Dec. 30, 2018
USD ($)
shares
Dec. 30, 2018
CAD ($)
shares
Dec. 31, 2017
USD ($)
shares
Dec. 31, 2017
CAD ($)
shares
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Number of common shares issuable pursuant to the exercise of stock options and vesting of Treasury RSUs for the plan (in shares) | shares   12,000,632    
Number of shares remained authorized for future issuance under the plan (in shares) | shares   1,524,965    
Outstanding options exercisable (in shares) | shares   915,628   599,562
Weighted average exercise price of outstanding options exercisable (in CAD per share)   $ 30.22   $ 26.68
Weighted average share price at date of exercise (in CAD per share)   $ 39.79   $ 39.23
Weighted average fair value of options granted (in dollars per share)     $ 5.15  
Compensation expense included in selling, general and administrative expenses and cost of sales $ 19,974,000   $ 16,065,000  
Treasury RSUs        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Vesting period 5 years 5 years    
Percentage of awards contingent on achievement of performance conditions 50.00% 50.00%    
Number of outstanding shares vested (in shares) | shares 0 0 0 0
Compensation expense included in selling, general and administrative expenses and cost of sales $ 500,000   $ 900,000  
Stock options        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Compensation expense included in selling, general and administrative expenses and cost of sales $ 2,900,000   $ 3,800,000  
Non-Treasury RSUs        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Vesting period 3 years 3 years    
Number of outstanding shares vested (in shares) | shares 0 0 0 0
Compensation expense included in selling, general and administrative expenses and cost of sales $ 16,400,000   $ 11,200,000  
Percentage of awards dependent on performance conditions 100.00% 100.00%    
Ratio of awards that can vest to the actual number of shares awarded 2 2    
USD        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Shares granted (in shares) | shares 0 0 759,000 759,000