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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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Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Stock-Based Compensation - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended	12 Months Ended
	Oct. 31, 2019	May 31, 2026	May 31, 2025	May 31, 2024
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options outstanding		2,079,000	1,892,000
Aggregate intrinsic value of options outstanding		$ 44.0
Weighted-average remaining contractual life of options outstanding		5 years 5 months 12 days
Aggregate intrinsic value of options exercisable		$ 40.6
Weighted-average remaining contractual life of options exercisable		4 years 5 months 12 days
Beginning balance		1,892,000
Omnibus Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Incentive plan approval date		Oct. 03, 2024
2014 Omnibus Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares of common stock authorized		6,000,000
Additional shares of common stock authorized	5,000,000
Shares available for future issuance		0
2024 Omnibus Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation arrangement vesting period		3 years
Shares of common stock authorized		5,000,000
Weighted-average grant date fair value		$ 110.59	$ 114.26	$ 93.51
Shares granted		18,261
Shares outstanding		83,000	373,000
Shares of restricted stock vested		26,000
2014 Omnibus Plan and 2024 Omnibus Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unamortized stock-based compensation expense		$ 2.3
Weighted-average grant date fair value		$ 117.19	$ 127.65	$ 98.61
Shares granted		15,000
Shares of restricted stock vested		15,000
Employee Incentive Plan 2007
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unamortized stock-based compensation expense		$ 4.1
Shares granted		0
Stock Appreciation Rights (SARs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock appreciation rights expected term		6 years	6 years	6 years
Unamortized stock-based compensation expense		$ 10.2
Unamortized stock-based compensation expense expected recognition period		2 years 6 months
Shares expected to vest		2,100,000
Shares expected to vest, weighted-average exercise price		$ 86.11
Shares vested or expected to vest, weighted-average remaining contractual term		5 years 5 months 8 days
Stock Appreciation Rights (SARs) \| Omnibus Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock appreciation rights expected term		10 years
Share based compensation arrangement vesting period		4 years
Full Value Stock Award \| 2014 Omnibus Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares of common stock authorized		3,000,000
Additional shares of common stock authorized	2,250,000
Full Value Stock Award \| 2024 Omnibus Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares of common stock authorized		2,500,000
Performance Earned Restricted Stock Awards and Performance Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation arrangement vesting period		3 years
Unamortized stock-based compensation expense		$ 14.3
Weighted-average grant date fair value		$ 110.54	$ 114.14	$ 93.74
Shares granted		259,000
Shares of restricted stock vested		84,000
Performance Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance goals attainment period for PSUs awards		3 years
Performance Stock Units \| Earnings Before Interest Taxes Margin
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage		50.00%
Performance Stock Units \| Upon Achievement of Performance Goals \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage		0.00%
Performance Stock Units \| Upon Achievement of Performance Goals \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage		200.00%
Nonvested Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unamortized stock-based compensation expense		$ 44.1
Weighted-average grant date fair value		$ 110.89
Shares granted		292,000
Remaining weighted-average contractual term		2 years 1 month 24 days
Shares of restricted stock vested		125,000