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Share-Based Compensation - Aggregated Information Regarding Stock Options Granted (Detail) - $ / shares	12 Months Ended
	Jan. 31, 2019	Jan. 31, 2018	Jan. 31, 2017
Share-based Compensation [Abstract]
Beginning balance, Number of Options	745,270	685,456	657,936
Granted, Number of Options	196,000	187,189	122,000
Exercised, Number of Options	(150,125)	(84,025)	(87,107)
Forfeited, Number of Options	(16,300)	(18,750)	(4,250)
Canceled, Number of Options	(3,700)	(24,600)	(3,123)
Ending balance, Number of Options	771,145	745,270	685,456
Beginning balance, Weighted-Average Exercise Price Per Share	$ 12.52	$ 11.96	$ 11.00
Granted, Weighted-Average Exercise Price Per Share	18.21	13.57	14.82
Exercised, Weighted-Average Exercise Price Per Share	10.62	10.08	8.73
Forfeited, Weighted Average Exercise Price Per Share	15.10	14.49	13.91
Cancelled, Weighted-Average Exercise Price Per Share	8.95	11.76	8.95
Ending balance, Weighted-Average Exercise Price Per Share	$ 14.30	$ 12.52	$ 11.96

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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.

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-SubTopic 10
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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.

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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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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.

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