Leases - Supplemental Balance Sheet Information Related to Operating and Finance Leases (Detail) - USD ($) $ in Millions |
May 31, 2026 |
May 31, 2025 |
|---|---|---|
| Leases [Abstract] | ||
| Rights of use - non-current assets | $ 16.6 | $ 17.2 |
| Lease liabilities - other current liabilities | $ 4.7 | $ 5.6 |
| Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] | Other Liabilities, Current | Other Liabilities, Current |
| Lease liabilities - non-current liabilities | $ 13.6 | $ 12.9 |
| Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] | Other Liabilities, Noncurrent | Other Liabilities, Noncurrent |
| Property and equipment | $ 0.0 | $ 2.4 |
| Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] | Long-Term Debt, Current Maturities | Long-Term Debt, Current Maturities |
| Current portion of finance lease | $ 0.0 | $ 2.4 |