Deferred Compensation and Retirement Plans - Components Of Net Periodic Benefit Costs (Detail) - Medical And Life Insurance Benefits - Hay Group - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2024	Apr. 30, 2023	Apr. 30, 2022
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 0	$ 0	$ 0
Interest cost	217	195	110
Net prior service credit amortization	(308)	(308)	(308)
Amortization of actuarial gain	(83)	(74)	0
Net periodic benefit cost	$ (174)	$ (187)	$ (198)