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Share-Based Compensation - Summary of Options Outstanding (Detail) - $ / shares	12 Months Ended
	Jan. 31, 2022	Jan. 31, 2021	Jan. 31, 2020	Jan. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares outstanding, total	598,043	622,083	679,044	771,145
Outstanding, Weighted Average Exercise Price	$ 14.67
Exercisable, Weighted Average Exercise Price	$ 14.63
Outstanding Remaining Contractual Life	4 years 4 months 24 days
Number of shares exercisable, total	591,493
Exercisable Remaining Contractual Life	4 years 3 months 18 days
$5.00 - $10.00 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding Range of Exercise prices, Lower Limit	$ 5.00
Outstanding Range of Exercise prices, Upper Limit	$ 10.00
Outstanding, Number of shares	35,844
Outstanding, Weighted Average Exercise Price	$ 7.97
Exercisable, Weighted Average Exercise Price	$ 7.97
Outstanding Remaining Contractual Life	6 months
Exercisable, Number of shares	35,844
Exercisable Remaining Contractual Life	6 months
$10.01 - $15.00 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding Range of Exercise prices, Lower Limit	$ 10.01
Outstanding Range of Exercise prices, Upper Limit	$ 15.00
Outstanding, Number of shares	345,749
Outstanding, Weighted Average Exercise Price	$ 13.62
Exercisable, Weighted Average Exercise Price	$ 13.62
Outstanding Remaining Contractual Life	3 years 10 months 24 days
Exercisable, Number of shares	345,749
Exercisable Remaining Contractual Life	3 years 10 months 24 days
$15.01 - $20.00 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding Range of Exercise prices, Lower Limit	$ 15.01
Outstanding Range of Exercise prices, Upper Limit	$ 20.00
Outstanding, Number of shares	216,450
Outstanding, Weighted Average Exercise Price	$ 17.48
Exercisable, Weighted Average Exercise Price	$ 17.43
Outstanding Remaining Contractual Life	5 years 9 months 18 days
Exercisable, Number of shares	209,900
Exercisable Remaining Contractual Life	5 years 9 months 18 days

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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

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The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding.

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The weighted average price as of the balance sheet date at which grantees could acquire the underlying shares with respect to all outstanding stock options which are in the customized range of exercise prices.

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