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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
	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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Gross number of share options (or share units) granted during the period.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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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

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Number of non-vested options outstanding.

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Number of non-vested options forfeited.

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Weighted average grant-date fair value of non-vested options forfeited.

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Weighted average grant-date fair value of non-vested options outstanding.

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Weighted average grant-date fair value of options vested.

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