v3.26.1
Retirement Benefits Plans - Schedule of Plan Assets Fair Value Hierarchy (Details) - USD ($)
$ in Millions
Apr. 30, 2026
Apr. 30, 2025
Apr. 30, 2024
Defined Benefit Plan Disclosure [Line Items]      
Total $ 81 $ 82 $ 84
Insurance policies | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Total $ 81 $ 82