Deferred Compensation and Retirement Plans - Total Long-Term Benefit Obligations (Detail) - USD ($) $ in Thousands	Apr. 30, 2023	Apr. 30, 2022
Defined Benefit Plan Disclosure [Line Items]
Total liability	$ 423,753	$ 376,091
Less: current portion of benefit obligation	(27,219)	(18,916)
Non-current liability	396,534	357,175
Deferred compensation and pension plans
Defined Benefit Plan Disclosure [Line Items]
Total liability	227,255	189,608
Medical and Life Insurance plan
Defined Benefit Plan Disclosure [Line Items]
Total liability	4,838	5,365
International retirement plans
Defined Benefit Plan Disclosure [Line Items]
Total liability	13,617	14,395
Executive Capital Accumulation Plan
Defined Benefit Plan Disclosure [Line Items]
Total liability	$ 178,043	$ 166,723