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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 |  |  |

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