v3.25.2
Postretirement Benefits - Weighted-Average Assumptions used to Determine Benefit Obligations and Net Periodic Postretirement Cost (Detail) - Postretirement Benefits
 12 Months Ended
May 31, 2025
May 31, 2024
May 31, 2023
Domestic      
Health Care Cost Trend Rates Assumptions [Line Items]      
Year-End Benefit Obligations, Discount rate 5.17% 5.50%  
Year-End Benefit Obligations, Current healthcare cost trend rate 8.30% 8.90%  
Year-End Benefit Obligations, Ultimate healthcare cost trend rate 4.00% 4.04%  
Year-End Benefit Obligation, Year ultimate healthcare cost trend rate will be realized 2048 2049  
Net Periodic Postretirement Cost, Discount rate 5.50% 5.20% 4.36%
Net Periodic Postretirement Cost, Current healthcare cost trend rate 8.90% 6.00% 6.23%
Net Periodic Postretirement Cost, Ultimate healthcare cost trend rate 4.04% 4.03% 4.03%
Net Periodic Postretirement Cost, Year ultimate healthcare cost trend rate will be realized 2049 2045 2045
Non-U.S. Plans      
Health Care Cost Trend Rates Assumptions [Line Items]      
Year-End Benefit Obligations, Discount rate 4.88% 5.03%  
Year-End Benefit Obligations, Current healthcare cost trend rate 5.13% 5.21%  
Year-End Benefit Obligations, Ultimate healthcare cost trend rate 3.70% 3.70%  
Year-End Benefit Obligation, Year ultimate healthcare cost trend rate will be realized 2040 2040  
Net Periodic Postretirement Cost, Discount rate 5.03% 5.10% 5.13%
Net Periodic Postretirement Cost, Current healthcare cost trend rate 5.21% 5.53% 5.58%
Net Periodic Postretirement Cost, Ultimate healthcare cost trend rate 3.70% 3.70% 3.70%
Net Periodic Postretirement Cost, Year ultimate healthcare cost trend rate will be realized 2040 2040 2040