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STOCK-BASED COMPENSATION - Summary of Change in Number of Non-Vested Options to Purchase Shares of Common Stock (Details) - $ / shares shares in Thousands | 12 Months Ended
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Jan. 31, 2021 | Jan. 31, 2020 | Jan. 31, 2019
STOCK-BASED COMPENSATION |  |  |
Shares, Non-vested, Beginning balance | 448 | 375 | 302
Shares, Granted | 242 | 238 | 257
Shares, Vested | (207) | (134) | (184)
Shares, Forfeitures | (16) | (31) |
Shares, Non-vested, Ending balance | 467 | 448 | 375
Weighted Average Fair Value, Non-vested, Beginning balance | $ 9.74 | $ 10.05 | $ 13.55
Weighted Average Fair Value, Granted | 6.53 | 9.60 | 9.31
Weighted Average Fair Value, Vested | 9.98 | 10.25 | 14.75
Weighted Average Fair Value, Forfeitures | 8.52 | 10.28 |
Weighted Average Fair Value, Non-vested, Ending balance | $ 8.01 | $ 9.74 | $ 10.05

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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + 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)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Weighted average grant-date fair value of non-vested options forfeited. + References No definition available. + Details
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