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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, 2024 | May 31, 2023 | May 31, 2022 | May 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock options outstanding |  |  | 1,990,000 | 2,288,000 |  |
Aggregate intrinsic value of options outstanding |  |  | $ 72.7 |  |  |
Weighted-average remaining contractual life of options outstanding |  |  | 6 years 4 months 20 days |  |  |
Aggregate intrinsic value of options exercisable |  |  | $ 52.1 |  |  |
Weighted-average remaining contractual life of options exercisable |  |  | 5 years 2 months 15 days |  |  |
Beginning balance |  |  | 2,288,000 |  |  |
Omnibus Incentive Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Incentive plan approval date |  |  | Oct. 09, 2014 |  |  |
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 |  |  |
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 |  |  | $ 2.4 |  |  |
Weighted-average grant date fair value |  |  | $ 98.61 | $ 92.87 | $ 81.53 |
Shares granted |  |  | 18,000 |  |  |
Shares of common stock available for grant | 500,000 |  |  |  |  |
Shares of restricted stock vested |  |  | 19,000 |  |  |
2007 Plan and 2014 Omnibus Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Weighted-average grant date fair value |  |  | $ 93.51 | $ 81.01 | $ 86.93 |
Shares granted |  |  | 25,643 |  |  |
Shares outstanding |  |  | 384,000 | 390,000 |  |
Employee Incentive Plan 2007 |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Unamortized stock-based compensation expense |  |  | $ 4.6 |  |  |
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 |  |  | $ 10.7 |  |  |
Unamortized stock-based compensation expense expected recognition period |  |  | 2 years 5 months 23 days |  |  |
Shares expected to vest |  |  | 2,000,000 |  |  |
Shares expected to vest, weighted-average exercise price |  |  | $ 75.52 |  |  |
Shares vested or expected to vest, weighted-average remaining contractual term |  |  | 6 years 4 months 17 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 |  |  | 1,989,900 |  |  |
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 |  |  |  |
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 |  |  | $ 13.1 |  |  |
Weighted-average grant date fair value |  |  | $ 93.74 |  | $ 81.03 | $ 86.88
Shares granted |  |  | 344,000 |  |  |
Shares of restricted stock vested |  |  | 357,000 |  |  |
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 |  |  | $ 29.9 |  |  |
Weighted-average grant date fair value |  |  | $ 93.95 |  |  |
Shares granted |  |  | 388,000 |  |  |
Remaining weighted-average contractual term |  |  | 2 years 5 months 19 days |  |  |
Shares of restricted stock vested |  |  | 421,000 |  |  |

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