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STOCK-BASED COMPENSATION - Stock options (Details) - Employee stock options
 12 Months Ended
Jan. 01, 2023
Options
$ / shares
shares
Apr. 24, 2001
Dec. 31, 2022
CAD ($)
Options
$ / shares
shares
Dec. 31, 2021
CAD ($)
Options
$ / shares
shares
Share based compensation        
Number of common shares that reserved for issuance to any one person under ESOP (in percentage)     5.00%  
Number of common shares reserved for issuance | shares       38,700,000
Number of stock options vested within 30 days of grant date | shares     410,950 397,668
Vesting period       3 years
Number of stock options        
Outstanding, beginning of year | Options 4,976,636   4,482,941 3,421,404
Granted during the year | Options     1,643,801 1,590,750
Exercised during the year | Options     (944,989) (471,765)
Forfeited during the year | Options     (205,117) (57,448)
Outstanding, end of year | Options     4,976,636 4,482,941
Options exercisable, end of year | Options     2,706,334 2,077,187
Weighted average exercise price        
Options outstanding, beginning of year | $ / shares $ 75.04   $ 74.43 $ 65.27
Granted during the year | $ / shares     67.10 89.59
Exercised during the year | $ / shares     57.68 58.40
Forfeited during the year | $ / shares     78.08 80.35
Options outstanding, end of year | $ / shares     75.04 74.43
Options exercisable, end of year | $ / shares     73.76 68.28
Average share price of common shares | $ / shares     $ 64.87 $ 76.00
Weighted average grant date fair value of stock options granted | $     $ 11.09 $ 18.95
Maximum        
Share based compensation        
Option term (expiration period)   5 years    
Vesting period     3 years  
Subsequent events        
Share based compensation        
Number of stock options vested within 30 days of grant date | shares 218,488      
Vesting period 3 years      
Number of stock options        
Granted during the year | Options 873,950