Equity Compensation Plans and Other Incentive Compensation - Schedule of Share-based Compensation Arrangement by Share-based Payment Award, Options Intrinsic Value (Detail) - USD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
May 31, 2026 |
May 31, 2025 |
May 31, 2024 |
|
| Share-Based Payment Arrangement [Abstract] | |||
| Aggregate intrinsic value of options outstanding | $ 14.5 | $ 0.1 | $ 0.1 |
| Aggregate intrinsic value of options exercisable | 0.4 | 0.0 | 0.0 |
| Aggregate intrinsic value of options exerised | $ 0.4 | $ 0.0 | $ 0.0 |