Deferred Compensation and Retirement Plans - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jan. 31, 2024	Jan. 31, 2023	Jan. 31, 2024	Jan. 31, 2023	Apr. 30, 2023
Defined Benefit Plan Disclosure [Line Items]
Increase in market value of the underlying COLI investments			$ 6,444	$ 7,439
Increase (decrease) in the fair value of marketable securities	$ 23,800	$ 12,700	22,800	3,000
CSV of COLI Contracts
Defined Benefit Plan Disclosure [Line Items]
Increase in market value of the underlying COLI investments	2,500	2,500	6,400	7,400
Deferred Compensation Plan | CSV of COLI Contracts
Defined Benefit Plan Disclosure [Line Items]
Gross CSV	293,400		293,400		$ 275,100
Outstanding policy loans	77,000		$ 77,000		$ 77,100
Executive Capital Accumulation Plan
Defined Benefit Plan Disclosure [Line Items]
Deferred compensation arrangement vesting period			5 years
Compensation expense (reduction)	22,500	12,100	$ 22,700	3,500
Increase (decrease) in the fair value of marketable securities	$ 23,800	$ 12,700	$ 22,800	$ 3,000
Executive Capital Accumulation Plan | Minimum
Defined Benefit Plan Disclosure [Line Items]
Option to receive employee benefits by quarterly installments periods			1 year
Executive Capital Accumulation Plan | Maximum
Defined Benefit Plan Disclosure [Line Items]
Option to receive employee benefits by quarterly installments periods			15 years