Deferred Compensation and Retirement Plans - Components of Net Periodic Benefits Costs (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jan. 31, 2024	Jan. 31, 2023	Jan. 31, 2024	Jan. 31, 2023
Defined Benefit Plan Disclosure [Line Items]
Expected long-term rate of return on plan assets			6.00%	5.50%
Deferred Compensation Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 11,347	$ 10,573	$ 32,526	$ 30,200
Interest cost	3,435	2,439	10,228	7,263
Amortization of actuarial loss	184	218	551	654
Expected return on plan assets	(272)	(289)	(816)	(867)
Net periodic service credit amortization	(101)	(101)	(304)	(304)
Net periodic benefit costs	$ 14,593	$ 12,840	$ 42,185	$ 36,946