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STOCKHOLDERS' EQUITY (Tables) | 12 Months Ended
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Jan. 31, 2023
STOCKHOLDERS' EQUITY, [Abstract] |
Schedule of restricted stock | Restricted Stock Units and Performance Based Restricted Stock Units ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | Restricted Stock Units | ​ | Performance Based Restricted Stock Units
​ | ​ | ​ | Weighted Average | ​ | ​ | ​ | Weighted Average
​ | Awards | ​ | Grant Date | ​ | Awards | ​ | Grant Date
​ | Outstanding |  | Fair Value | ​ | Outstanding |  | Fair Value
Unvested as of January 31, 2020 | 242,943 | ​ | $ | 37.95 | ​ | 1,058,710 | ​ | $ | 36.15
Granted | 1,280,664 | ​ | $ | 10.25 | ​ | — | ​ | $ | —
Vested | (107,917) | ​ | $ | 37.96 | ​ | (279,053) | ​ | $ | 32.43
Cancelled | (22,422) | ​ | $ | 39.41 | ​ | (312,827) | ​ | $ | 42.41
Unvested as of January 31, 2021 | 1,393,268 | ​ | $ | 12.47 | ​ | 466,830 | ​ | $ | 34.17
Granted | 326,791 | ​ | $ | 31.52 | ​ | 176,212 | ​ | $ | 31.43
Vested | (201,260) | ​ | $ | 20.43 | ​ | (125,934) | ​ | $ | 30.23
Cancelled | (2,650) | ​ | $ | 33.46 | ​ | — | ​ | $ | —
Unvested as of January 31, 2022 | 1,516,149 | ​ | $ | 15.48 | ​ | 517,108 | ​ | $ | 34.20
Granted | 1,076,509 | ​ | $ | 26.88 | ​ | 308,317 | ​ | $ | 31.42
Vested | (656,814) | ​ | $ | 29.11 | ​ | (78,998) | ​ | $ | 35.77
Cancelled | (17,599) | ​ | $ | 31.21 | ​ | (261,898) | ​ | $ | 35.60
Unvested as of January 31, 2023 | 1,918,245 | ​ | $ | 17.07 | ​ | 484,529 | ​ | $ | 31.41
​
Schedule of information regarding stock options | Stock Options ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 2023 | ​ | 2022 | ​ | 2021
​ | ​ | ​ | ​ | Weighted | ​ | ​ | ​ | Weighted | ​ | ​ | ​ | Weighted
​ | ​ | ​ | ​ | Average | ​ | ​ | ​ | Average | ​ | ​ | ​ | Average
​ |  | Shares |  | Exercise |  | Shares |  | Exercise |  | Shares |  | Exercise
Stock options outstanding at beginning of year | ​ | 10,000 | ​ | $ | 18.11 | ​ | 18,245 | ​ | $ | 23.63 | ​ | 39,311 | ​ | $ | 18.51
Exercised | ​ | — | ​ | $ | — | ​ | — | ​ | $ | — | ​ | (21,066) | ​ | $ | 14.07
Granted | ​ | — | ​ | $ | — | ​ | — | ​ | $ | — | ​ | — | ​ | $ | —
Cancelled or forfeited | ​ | (10,000) | ​ | $ | 18.11 | ​ | (8,245) | ​ | $ | 30.32 | ​ | — | ​ | $ | —
Stock options outstanding at end of year | ​ | — | ​ | $ | — | ​ | 10,000 | ​ | $ | 18.11 | ​ | 18,245 | ​ | $ | 23.63
Exercisable | ​ | — | ​ | $ | — | ​ | 10,000 | ​ | $ | 18.11 | ​ | 18,245 | ​ | $ | 23.63
​

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