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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 |  |

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