v3.26.1
Pension and Employee Benefit Plans, Weighted-average Asset Allocations (Details) - U.S. Pension Plans
12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Mar. 31, 2024
Fair Value Measurements      
Plan assets   100.00%  
Debt securities      
Fair Value Measurements      
Plan assets   97.00%  
Cash and cash equivalents      
Fair Value Measurements      
Plan assets   3.00%  
U.S. Plans      
Fair Value Measurements      
Expected return on plan assets 5.50% 5.50% 6.50%