Deferred Compensation and Retirement Plans - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Jul. 31, 2025	Jul. 31, 2024	Apr. 30, 2025
Defined Benefit Plan Disclosure [Line Items]
Increase in market value of the underlying COLI investments	$ 2,569	$ 2,246
CSV of COLI Contracts
Defined Benefit Plan Disclosure [Line Items]
Increase in market value of the underlying COLI investments	2,600	2,200
Deferred Compensation Plan | CSV of COLI Contracts
Defined Benefit Plan Disclosure [Line Items]
Gross CSV	341,400		$ 325,500
Outstanding policy loans	$ 72,800		$ 72,800
Executive Capital Accumulation Plan
Defined Benefit Plan Disclosure [Line Items]
Deferred compensation arrangement vesting period	5 years
Compensation expense (reduction)	$ 12,000	13,600
Increase (decrease) in the fair value of marketable securities	$ 12,300	$ 14,200
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