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Share-Based Compensation - Aggregated Information Regarding Stock Options Granted (Detail) - $ / shares	12 Months Ended
	Jan. 31, 2022	Jan. 31, 2021	Jan. 31, 2020
Share-based Compensation [Abstract]
Beginning balance, Number of Options	622,083	679,044	771,145
Granted, Number of Options	0	0	0
Exercised, Number of Options	(6,425)	(1,200)	(57,175)
Forfeited, Number of Options	(17,615)	(54,361)	(34,526)
Canceled, Number of Options	0	(1,400)	(400)
Ending balance, Number of Options	598,043	622,083	679,044
Beginning balance, Weighted-Average Exercise Price Per Share	$ 14.63	$ 14.46	$ 14.30
Granted, Weighted-Average Exercise Price Per Share	0	0	0
Exercised, Weighted-Average Exercise Price Per Share	9.34	7.60	11.60
Forfeited, Weighted-Average Exercise Price Per Share	15.09	12.89	15.73
Cancelled, Weighted-Average Exercise Price Per Share	0	7.36	6.22
Ending balance, Weighted-Average Exercise Price Per Share	$ 14.67	$ 14.63	$ 14.46

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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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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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