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Share-Based Compensation - Aggregated Information Regarding Stock Options Granted (Detail) - $ / shares	12 Months Ended
	Jan. 31, 2017	Jan. 31, 2016	Jan. 31, 2015
Share-based Compensation [Abstract]
Beginning balance, Number of Options	657,936	656,011	736,647
Granted, Number of Options	122,000	115,000	158,600
Exercised, Number of Options	(87,107)	(93,344)	(224,275)
Forfeited, Number of Options	(4,250)	(5,550)	(8,975)
Canceled, Number of Options	(3,123)	(14,181)	(5,986)
Ending balance, Number of Options	685,456	657,936	656,011
Beginning balance, Weighted-Average Exercise Price Per Share	$ 11.00	$ 10.01	$ 8.63
Granted, Weighted-Average Exercise Price Per Share	14.82	13.95	13.99
Exercised, Weighted-Average Exercise Price Per Share	8.73	7.95	8.29
Forfeited, Weighted Average Exercise Price Per Share	13.91	12.75	11.84
Cancelled, Weighted-Average Exercise Price Per Share	8.95	8.82	8.70
Ending balance, Weighted-Average Exercise Price Per Share	$ 11.96	$ 11.00	$ 10.01

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Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

+ 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 (c)(1)(iv)(4)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

+ 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 (c)(1)(iv)(3)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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

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Number of options outstanding, including both vested and non-vested options.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options of the plan that expired.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Number of share options (or share units) exercised during the current period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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