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

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Stock-Based Compensation - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions		1 Months Ended	12 Months Ended
	Oct. 10, 2003	Oct. 31, 2019	May 31, 2025	May 31, 2024	May 31, 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options outstanding			1,892,000	1,990,000
Aggregate intrinsic value of options outstanding			$ 61.4
Weighted-average remaining contractual life of options outstanding			6 years 29 days
Aggregate intrinsic value of options exercisable			$ 49.4
Weighted-average remaining contractual life of options exercisable			5 years 1 month 2 days
Beginning balance			1,990,000
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]
Shares of common stock authorized			5,000,000
Directors Equity Incentive Plan 2003
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Incentive plan approval date	Oct. 10, 2003
Share based compensation arrangement vesting period	3 years
Unamortized stock-based compensation expense			$ 2.0
Weighted-average grant date fair value			$ 127.65	$ 98.61	$ 92.87
Shares granted			11,000
Shares of common stock available for grant	500,000
Shares of restricted stock vested			21,000
2007 Plan and 2014 Omnibus Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average grant date fair value			$ 114.26	$ 93.51	$ 81.01
Shares granted			16,322
Shares outstanding			373,000	384,000
Employee Incentive Plan 2007
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unamortized stock-based compensation expense			$ 4.5
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			$ 10.3
Unamortized stock-based compensation expense expected recognition period			2 years 5 months 1 day
Shares expected to vest			1,900,000
Shares expected to vest, weighted-average exercise price			$ 81.41
Shares vested or expected to vest, weighted-average remaining contractual term			6 years 25 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
Stock options outstanding			1,891,800
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			$ 17.2
Weighted-average grant date fair value			$ 114.14	$ 93.74	$ 81.03
Shares granted			302,000
Shares of restricted stock vested			284,000
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			$ 43.4
Weighted-average grant date fair value			$ 114.6
Shares granted			330,000
Remaining weighted-average contractual term			2 years 3 months
Shares of restricted stock vested			384,000