Deferred Compensation and Retirement Plans - Total Long-Term Benefit Obligations (Detail) - USD ($) $ in Thousands	Apr. 30, 2024	Apr. 30, 2023
Defined Benefit Plan Disclosure [Line Items]
Total liability	$ 483,773	$ 423,753
Less: current portion of benefit obligation	(43,377)	(27,219)
Non-current benefit obligation	440,396	396,534
Deferred compensation and pension plans
Defined Benefit Plan Disclosure [Line Items]
Total liability	262,403	227,255
Medical and Life Insurance plan
Defined Benefit Plan Disclosure [Line Items]
Total liability	4,227	4,838
International retirement plans
Defined Benefit Plan Disclosure [Line Items]
Total liability	12,606	13,617
Executive Capital Accumulation Plan
Defined Benefit Plan Disclosure [Line Items]
Total liability	$ 204,537	$ 178,043