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Employee Benefit Plans - Summary of weighted average actuarial assumptions utilized to benefit obligations (Details)
12 Months Ended
May 31, 2022
May 31, 2021
May 31, 2020
Pension Plans | U.K.      
Weighted average assumptions used to determine benefit obligations:      
Discount rate 3.50% 2.00% 1.70%
Rate of compensation increase 4.10% 4.10% 3.60%
Weighted average assumptions used to determine net periodic benefit cost:      
Discount rate 1.60% 2.10% 2.40%
Expected long-term return on plan assets 3.10% 2.20% 3.10%
Rate of compensation increase 4.10% 3.60% 4.10%
Other Postretirement Benefits | U.S.      
Weighted average assumptions used to determine benefit obligations:      
Discount rate 4.30% 2.50% 2.70%
Rate of compensation increase 0.00% 0.00% 0.00%
Weighted average assumptions used to determine net periodic benefit cost:      
Discount rate 1.70% 1.50% 3.20%
Expected long-term return on plan assets 0.00% 0.00% 0.00%
Rate of compensation increase 0.00% 0.00% 0.00%