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Stock Options Granted

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount of tax benefit for recognition of expense of award under share-based payment arrangement.

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Number of shares authorized for issuance under share-based payment arrangement.

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Share-Based Compensation - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Jan. 31, 2026	Jan. 31, 2025	Jan. 31, 2024
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Tax benefit associated with share-based compensation expense	$ 7,184	$ 7,204	$ 3,086
Tax benefit realized from share-based compensation	$ 11,033	$ 7,846	$ 1,763
Weighted average grant date fair value	$ 56.77	$ 41.92	$ 26.96
2017 Stock Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common shares authorized	10,000,000
Common shares available to grant	3,585,413
2008 Stock Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common shares authorized	10,000,000
Common shares available to grant	5,594,830
2017 and 2008 Stock Incentive Plan \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options vesting period, maximum (in years)			7 years
2017 and 2008 Stock Incentive Plan \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options vesting period, maximum (in years)	10 years
Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options vesting period, maximum (in years)	1 year
Compensation cost of stock options granted but not yet vested	$ 0
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation cost of stock options granted but not yet vested	$ 30,965
Weighted average grant date fair value	$ 57.97	41.9	$ 27.42
Weighted average period of recognition (in years)	1 year 10 months 24 days
Vested, Shares	906,598
Aggregate grant date fair value, vested	$ 30.07	$ 29.72	$ 31.11
Restricted Stock Units (RSUs) \| Non-employee Directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options granted	0	0	0
Restricted Stock Units (RSUs) \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options vesting period, maximum (in years)			2 years
Restricted Stock Units (RSUs) \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options vesting period, maximum (in years)			4 years
Performance Stock Units (PSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation cost of stock options granted but not yet vested	$ 5,096
Weighted average grant date fair value	$ 56.77
Weighted average period of recognition (in years)	1 year 10 months 24 days
Vested, Shares	180,713
Aggregate grant date fair value, vested	$ 30.88	$ 31.26	$ 33.01
Performance Stock Units (PSUs) \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options vesting period, maximum (in years)			2 years
Performance Stock Units (PSUs) \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options vesting period, maximum (in years)			4 years