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Deferred Compensation and Retirement Plans - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Oct. 31, 2024
Oct. 31, 2023
Oct. 31, 2024
Oct. 31, 2023
Apr. 30, 2024
Defined Benefit Plan Disclosure [Line Items]          
Increase in market value of the underlying COLI investments     $ 4,789 $ 3,947  
CSV of COLI Contracts          
Defined Benefit Plan Disclosure [Line Items]          
Increase in market value of the underlying COLI investments $ 2,500 $ 2,000 4,800 $ 3,900  
Deferred Compensation Plan | CSV of COLI Contracts          
Defined Benefit Plan Disclosure [Line Items]          
Gross CSV 313,400   313,400   $ 295,900
Outstanding policy loans 76,400   $ 76,400   $ 77,000
Executive Capital Accumulation Plan          
Defined Benefit Plan Disclosure [Line Items]          
Deferred compensation arrangement vesting period     5 years    
Compensation expense (reduction) 4,700 (12,300) $ 18,200    
Increase (decrease) in the fair value of marketable securities $ 4,700 $ (13,800) $ 18,900    
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