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STOCK-BASED COMPENSATION (Tables) | 3 Months Ended
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Apr. 30, 2021 | Apr. 30, 2020
STOCK-BASED COMPENSATION |  |
Schedule of stock option activity under the Company's stock plans | Stock Options A summary of stock option activity under the Company’s approved Stock Plans for the three months ended April 30, 2021, along with corresponding weighted average per share amounts, is presented below (shares in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Exercise | ​ | Remaining | ​ | ​
​ |  | Shares |  | Price |  | Term (years) |  | Fair Value
Outstanding, February 1, 2021 |  | 1,405 | ​ | $ | 44.17 |  | 6.90 | ​ | $ | 10.39
Granted | ​ | 32 | ​ | $ | 54.60 | ​ | ​ | ​ | ​ | ​
Exercised | ​ | (26) | ​ | $ | 39.37 | ​ | ​ | ​ | ​ | ​
Forfeited | ​ | (3) | ​ | $ | 42.31 | ​ | ​ | ​ | ​ | ​
Outstanding, April 30, 2021 | ​ | 1,408 | ​ | $ | 44.50 |  | 6.77 | ​ | $ | 10.44
Exercisable, April 30, 2021 |  | 1,029 | ​ | $ | 45.47 |  | 6.01 | ​ | $ | 11.24
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Outstanding, April 30, 2020 | ​ | 1,431 | ​ | $ | 43.69 |  | 7.33 | ​ | $ | 10.45
Exercisable, April 30, 2020 |  | 874 | ​ | $ | 45.78 |  | 6.17 | ​ | $ | 11.74
Schedule of changes in the number of non-vested options to purchase shares of common stock |  | The change in the number of non-vested options to purchase shares of common stock for the three months ended April 30, 2021, and the weighted average fair value per share for each number, is presented below (shares in thousands):
​ | ​ | ​ | ​ | ​ | ​
​ |  | Shares |  | Fair Value
Non-vested, February 1, 2021 |  | 467 | ​ | $ | 8.01
Granted |  | 32 | ​ | $ | 11.12
Vested |  | (117) | ​ | $ | 8.06
Forfeitures | ​ | (3) | ​ | $ | 8.67
Non-vested, April 30, 2021 |  | 379 | ​ | $ | 8.25
​ | ​ | ​ | ​ | ​ | ​
Non-vested, April 30, 2020 |  | 557 | ​ | $ | 8.42
Schedule of changes in restricted stock units | The changes in the maximum number of restricted stock units for the three months ended April 30, 2021, and the weighted average fair value per share for each number, are presented below (shares in thousands): ​
​ | ​ | ​ | ​ | ​ | ​
​ |  | Shares |  | Fair Value
Outstanding, February 1, 2021 |  | 117 | ​ | $ | 17.71
Awarded |  | 113 | ​ | $ | 38.91
Issued |  | (40) | ​ | $ | 20.64
Outstanding, April 30, 2021 |  | 190 | ​ | $ | 29.73
​ | ​ | ​ | ​ | ​ | ​
Outstanding, April 30, 2020 |  | 117 | ​ | $ | 17.71

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- Definition Tabular disclosure of the changes in outstanding nonvested shares. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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