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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 | 6 Months Ended
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Jul. 31, 2018 | Jul. 31, 2017
STOCK-BASED COMPENSATION |  |
Shares, Non-vested, Beginning balance | 302 | 270
Shares, Granted | 97 | 125
Shares, Vested | (125) | (105)
Shares, Forfeitures |  | (10)
Shares, Non-vested, Ending balance | 274 | 280
Weighted Average Fair Value, Non-vested, Beginning balance | $ 13.55 | $ 14.93
Weighted Average Fair Value, Granted | 8.74 | 16.19
Weighted Average Fair Value, Vested | 16.19 | 9.66
Weighted Average Fair Value, Forfeitures |  | 19.14
Weighted Average Fair Value, Non-vested, Ending balance | $ 10.64 | $ 17.83

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=96867065&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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