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SHARE-BASED COMPENSATION (Outstanding stock options) (Details)
 12 Months Ended
Jan. 03, 2021
shares
$ / shares
Dec. 29, 2019
shares
gal
$ / shares
Dec. 29, 2019
shares
gal
$ / shares
$ / shares
Dec. 29, 2019
$ / shares
Dec. 30, 2018
$ / shares
Dec. 30, 2018
$ / shares
CAD            
Disclosure of terms and conditions of share-based payment arrangement [line items]            
Number, outstanding, beginning of fiscal period (in shares) 1,550,000 1,993,000 1,993,000      
Weighted average exercise price of share options outstanding in share-based payment arrangement | $ / shares $ 36.33 $ 35.65 $ 35.65   $ 33.60  
Exercised (in shares) (87,000) (443,000) (443,000)      
Weighted average exercise price of share options exercised in share-based payment arrangement | $ / shares $ 24.22 $ 26.45        
Number, outstanding, end of fiscal period (in shares) 1,463,000 1,550,000 1,550,000      
USD            
Disclosure of terms and conditions of share-based payment arrangement [line items]            
Number, outstanding, beginning of fiscal period (in shares) 669,000 669,000 669,000      
Weighted average exercise price of share options outstanding in share-based payment arrangement | (per share) $ 27.27     $ 29.01   $ 29.01
Forfeited (in shares) | gal   0 0      
Weighted average exercise price of share options forfeited in share-based payment arrangement | $ / shares     $ 0      
Granted (in shares)   1,387,000 1,387,000      
Weighted average exercise price of share options granted in share-based payment arrangement | $ / shares     $ 26.43      
Number, outstanding, end of fiscal period (in shares) 2,056,000 669,000 669,000