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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
	Jul. 31, 2016	Jul. 31, 2015
STOCK-BASED COMPENSATION
Shares, Nonvested, Beginning balance	300	306
Shares, Granted	105	135
Shares, Vested	(135)	(181)
Shares, Nonvested, Ending balance	270	260
Weighted Average Fair Value, Nonvested, Beginning balance	$ 8.97	$ 7.14
Weighted Average Fair Value, Granted	9.66	8.99
Weighted Average Fair Value, Vested	8.99	6.28
Weighted Average Fair Value, Nonvested, Ending balance	$ 9.22	$ 8.70

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- Definition

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

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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=6415400&loc=d3e5070-113901

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- Definition

Number of non-vested options outstanding.

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

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Number of options vested.

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Weighted average grant-date fair value of options vested.

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