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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, 2018 | Jan. 31, 2017 | Jan. 31, 2016
STOCK-BASED COMPENSATION |  |  |
Shares, Non-vested, Beginning balance | 270 | 300 | 306
Shares, Granted | 302 | 270 | 300
Shares, Vested | (260) | (300) | (306)
Shares, Forfeitures | (10) |  |
Shares, Non-vested, Ending balance | 302 | 270 | 300
Weighted Average Fair Value, Non-vested, Beginning balance | $ 14.93 | $ 8.97 | $ 7.14
Weighted Average Fair Value, Granted | 13.55 | 14.93 | 8.97
Weighted Average Fair Value, Vested | 15.31 | 8.97 | 7.14
Weighted Average Fair Value, Forfeitures | 19.14 |  |
Weighted Average Fair Value, Non-vested, Ending balance | $ 13.55 | $ 14.93 | $ 8.97

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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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