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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, 2023 | May 31, 2022 | May 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Aggregate intrinsic value of options outstanding |  |  | $ 29.4 |  |
Weighted-average remaining contractual life of options outstanding |  |  | 5 years 11 months 12 days |  |
Aggregate intrinsic value of options exercisable |  |  | $ 27.8 |  |
Weighted-average remaining contractual life of options exercisable |  |  | 4 years 7 months 24 days |  |
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 |  |  | $ 2.3 |  |
Weighted-average grant date fair value |  |  | $ 92.87 | $ 81.53 | $ 87.35
Shares granted |  |  | 21,000 |  |
Shares of common stock available for grant | 500,000 |  |  |  |
Shares of restricted stock vested |  |  | 25,000 |  |
2007 Plan and 2014 Omnibus Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Weighted-average grant date fair value |  |  | $ 81.01 | $ 86.93 | $ 78.49
Shares granted |  |  | 23,705 |  |
Shares outstanding |  |  | 390,000 | 386,000 |
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 |  |
SARs |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Stock appreciation rights expected term |  |  | 6 years | 6 years | 6 years 6 months
Unamortized stock-based compensation expense |  |  | $ 9.3 |  |
Unamortized stock-based compensation expense expected recognition period |  |  | 2 years 6 months 3 days |  |
Shares expected to vest |  |  | 2,300,000 |  |
Shares expected to vest, weighted-average exercise price |  |  | $ 68.17 |  |
Shares expected to vest, weighted-average remaining contractual term |  |  | 5 years 11 months 8 days |  |
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 |  |  | 2,287,500 |  |
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 |  |  | $ 11.5 |  |
Weighted-average grant date fair value |  |  | $ 81.03 | $ 86.88 | $ 80.67
Shares granted |  |  | 223,000 |  |
Shares of restricted stock vested |  |  | 359,000 |  |
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 |  |  | $ 27.5 |  |
Weighted-average grant date fair value |  |  | $ 81.95 |  |
Shares granted |  |  | 268,000 |  |
Remaining weighted-average contractual term |  |  | 2 years 1 month 17 days |  |
Shares expected to vest |  |  | 1,080,000.00 |  |
Shares of restricted stock vested |  |  | 432,000 |  |

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