Deferred Compensation and Retirement Plans - Components of Net Periodic Benefits Costs (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jan. 31, 2023	Jan. 31, 2022	Jan. 31, 2023	Jan. 31, 2022
Defined Benefit Plan Disclosure [Line Items]
Expected long-term rate of return on plan assets			5.50%	6.00%
Deferred Compensation Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 10,573	$ 9,762	$ 30,200	$ 28,190
Interest cost	2,439	1,038	7,263	3,095
Amortization of actuarial loss	218	537	654	1,622
Expected return on plan assets	(289)	(387)	(867)	(1,160)
Net periodic service credit amortization	(101)	(101)	(304)	(304)
Net periodic benefit costs	$ 12,840	$ 10,849	$ 36,946	$ 31,443