Employee Benefit Plans - Summary of weighted average actuarial assumptions utilized to benefit obligations (Details) |
12 Months Ended | ||
|---|---|---|---|
May 31, 2026 |
May 31, 2025 |
May 31, 2024 |
|
| Pension Plans | UNITED KINGDOM | |||
| Weighted average assumptions used to determine benefit obligations: | |||
| Discount rate | 5.40% | 5.80% | 5.20% |
| Rate of compensation increase | 0.00% | 3.80% | 4.10% |
| Weighted average assumptions used to determine net periodic benefit cost: | |||
| Discount rate | 5.80% | 5.10% | 5.50% |
| Expected long-term return on plan assets | 5.50% | 4.90% | 5.60% |
| Rate of compensation increase | 3.80% | 4.10% | 4.00% |
| Other Postretirement Benefits | United States | |||
| Weighted average assumptions used to determine benefit obligations: | |||
| Discount rate | 5.20% | 5.40% | 5.50% |
| Rate of compensation increase | 0.00% | 0.00% | 0.00% |
| Weighted average assumptions used to determine net periodic benefit cost: | |||
| Discount rate | 5.40% | 5.40% | 5.20% |
| Expected long-term return on plan assets | 0.00% | 0.00% | 0.00% |
| Rate of compensation increase | 0.00% | 0.00% | 0.00% |