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SHARE-BASED COMPENSATION (Outstanding stock options) (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, outstanding, end of fiscal period (in shares) 2,662,000 2,662,000    
CAD        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Number, outstanding, beginning of fiscal period (in shares) 2,263,000 2,263,000 2,532,000 2,532,000
Exercised (in shares) (110,000) (110,000) (269,000) (269,000)
Forfeited (in shares) (160,000) (160,000)    
Number, outstanding, end of fiscal period (in shares) 1,993,000 1,993,000 2,263,000 2,263,000
Weighted exercise price, outstanding, beginning of fiscal period (in CAD per share) | $   $ 32.94   $ 31.18
Exercised (in CAD per share) | $   19.98   16.43
Forfeited (in CAD per share) | $ $ 33.58      
Weighted exercise price, outstanding, end of fiscal period (in CAD per share) | $   $ 33.60   $ 32.94
USD        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Number, outstanding, beginning of fiscal period (in shares) 759,000 759,000 0 0
Granted (in shares) 0 0 759,000 759,000
Forfeited (in shares) (90,000) (90,000)    
Number, outstanding, end of fiscal period (in shares) 669,000 669,000 759,000 759,000
Weighted exercise price, outstanding, beginning of fiscal period (in CAD per share) $ 29.01     $ 0.00
Granted (in CAD per share) | $     $ 29.01  
Forfeited (in CAD per share) | $ 29.01      
Weighted exercise price, outstanding, end of fiscal period (in CAD per share) | $ $ 29.01   $ 29.01