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Share-Based Compensation - Aggregated Information Regarding Stock Options Granted (Detail) - $ / shares	12 Months Ended
	Jan. 31, 2025	Jan. 31, 2024	Jan. 31, 2023
Share-based Compensation [Abstract]
Beginning balance, Number of Options	523,349	547,199	598,043
Granted, Number of Options	0	0	0
Exercised, Number of Options	(65,900)	(9,100)	(42,944)
Forfeited, Number of Options	0	(10,525)	(5,500)
Cancelled, Number of Options	(35,750)	(4,225)	(2,400)
Ending balance, Number of Options	421,699	523,349	547,199
Beginning balance, Weighted-Average Exercise Price Per Share	$ 15.26	$ 15.16	$ 14.67
Granted, Weighted-Average Exercise Price Per Share	0	0	0
Exercised, Weighted-Average Exercise Price Per Share	13.86	11.54	8.74
Forfeited, Weighted-Average Exercise Price Per Share	0	15.20	15.42
Cancelled, Weighted-Average Exercise Price Per Share	14.69	10.5	8.09
Ending balance, Weighted-Average Exercise Price Per Share	$ 15.52	$ 15.26	$ 15.16

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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/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)(04)
-Publisher FASB
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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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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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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 price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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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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