Deferred Compensation and Retirement Plans - Schedule of Total Long-Term Benefit Obligations (Detail) - USD ($) $ in Thousands	Apr. 30, 2025	Apr. 30, 2024
Defined Benefit Plan Disclosure [Line Items]
Total liability	$ 526,388	$ 483,773
Less: current portion of benefit obligation	(48,618)	(43,377)
Non-current benefit obligation	477,770	440,396
Deferred compensation and pension plans
Defined Benefit Plan Disclosure [Line Items]
Total liability	298,316	262,403
Medical and Life Insurance plan
Defined Benefit Plan Disclosure [Line Items]
Total liability	4,188	4,227
International retirement plans
Defined Benefit Plan Disclosure [Line Items]
Total liability	13,278	12,606
Executive Capital Accumulation Plan
Defined Benefit Plan Disclosure [Line Items]
Total liability	$ 210,606	$ 204,537