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STOCK-BASED COMPENSATION (Tables) | 6 Months Ended
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Jul. 31, 2023
STOCK-BASED COMPENSATION |
Schedule of stock option activity under the Company's stock plans | A summary of stock option activity under the Stock Plans for the six months ended July 31, 2023, along with corresponding weighted average per share amounts, is presented below (shares in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | Weighted | ​ | Weighted
​ | ​ | ​ | ​ | ​ | ​ | ​ | Average | ​ | Average
​ | ​ | ​ | ​ | Weighted | ​ | Remaining | ​ | Grant Date
​ | ​ | ​ | ​ | Average Exercise | ​ | Contractual | ​ | Fair Value
​ |  | Shares |  | Price Per Share |  | Term (years) |  | Per Share
Outstanding, February 1, 2023 |  | 1,440 | ​ | $ | 43.84 |  | 5.46 | ​ | $ | 10.11
Granted | ​ | 10 | ​ | $ | 39.47 | ​ | ​ | ​ | ​ | ​
Exercised | ​ | (45) | ​ | $ | 21.04 | ​ | ​ | ​ | ​ | ​
Forfeited | ​ | (1) | ​ | $ | 33.81 | ​ | ​ | ​ | ​ | ​
Outstanding, July 31, 2023 | ​ | 1,404 | ​ | $ | 44.55 |  | 5.16 | ​ | $ | 10.28
Exercisable, July 31, 2023 |  | 1,276 | ​ | $ | 45.01 | ​ | 4.82 | ​ | $ | 10.53
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Outstanding, July 31, 2022 | ​ | 1,431 | ​ | $ | 44.08 |  | 5.79 | ​ | $ | 10.19
Exercisable, July 31, 2022 |  | 1,192 | ​ | $ | 44.83 |  | 5.27 | ​ | $ | 10.74
Schedule of changes in the number of non-vested options to purchase shares of common stock | The changes in the number of non-vested options to purchase shares of common stock for the six months ended July 31, 2023, and the weighted average fair value per share for each number, are presented below (shares in thousands):
​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ | ​ | Weighted
​ | ​ | ​ | ​ | Average
​ | ​ | ​ | ​ | Grant Date
​ | ​ | ​ | ​ | Fair Value
​ | ​ | Shares |  | Per Share
Non-vested, February 1, 2023 |  | 194 | ​ | $ | 7.27
Granted |  | 10 | ​ | $ | 8.12
Vested |  | (75) | ​ | $ | 6.62
Forfeitures | ​ | (1) | ​ | $ | 5.68
Non-vested, July 31, 2023 |  | 128 | ​ | $ | 7.72
​ | ​ | ​ | ​ | ​ | ​
Non-vested, July 31, 2022 |  | 239 | ​ | $ | 7.45
Schedule of changes in restricted stock units | The changes in the maximum number of shares of common stock issuable pursuant to outstanding restricted stock units for the six months ended July 31, 2023, and the weighted average fair value per share for each restricted stock unit, are presented below (shares in thousands): ​
​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | Weighted
​ | ​ | ​ | ​ | Average
​ | ​ | ​ | ​ | Grant Date
​ | ​ | ​ | ​ | Fair Value
​ | ​ | Shares | ​ | Per Share
Outstanding, February 1, 2023 |  | 310 | ​ | $ | 30.80
Awarded |  | 96 | ​ | $ | 30.68
Issued | ​ | (37) | ​ | $ | 44.86
Forfeited | ​ | (49) | ​ | $ | 15.57
Outstanding, July 31, 2023 |  | 320 | ​ | $ | 30.34
​ | ​ | ​ | ​ | ​ | ​
Outstanding, July 31, 2022 |  | 280 | ​ | $ | 29.46

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