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Employee Benefit Plans - Summary of weighted average actuarial assumptions utilized to benefit obligations (Details)
12 Months Ended
May 31, 2024
May 31, 2023
May 31, 2022
Pension Plans | U.K.      
Weighted average assumptions used to determine benefit obligations:      
Discount rate 5.20% 5.40% 3.50%
Rate of compensation increase 4.10% 4.00% 4.10%
Weighted average assumptions used to determine net periodic benefit cost:      
Discount rate 5.50% 1.90% 1.60%
Expected long-term return on plan assets 5.60% 4.40% 3.10%
Rate of compensation increase 4.00% 4.10% 4.10%
Other Postretirement Benefits | U.S.      
Weighted average assumptions used to determine benefit obligations:      
Discount rate 5.50% 5.30% 4.30%
Rate of compensation increase 0.00% 0.00% 0.00%
Weighted average assumptions used to determine net periodic benefit cost:      
Discount rate 5.20% 3.90% 1.70%
Expected long-term return on plan assets 0.00% 0.00% 0.00%
Rate of compensation increase 0.00% 0.00% 0.00%