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Deferred Compensation and Retirement Plans - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jan. 31, 2023
Jan. 31, 2022
Jan. 31, 2023
Jan. 31, 2022
Apr. 30, 2022
Defined Benefit Plan Disclosure [Line Items]          
Increase in market value of the underlying COLI investments     $ 7,439 $ 3,897  
Increase (decrease) in the fair value of marketable securities $ 12,700 $ (7,700) 3,000 2,400  
CSV of COLI Contracts          
Defined Benefit Plan Disclosure [Line Items]          
Increase in market value of the underlying COLI investments 2,500 1,700 7,400 3,900  
Deferred Compensation Plan | CSV of COLI Contracts          
Defined Benefit Plan Disclosure [Line Items]          
Gross CSV 276,200   276,200   $ 263,200
Outstanding policy loans 77,600   $ 77,600   $ 79,800
Executive Capital Accumulation Plan          
Defined Benefit Plan Disclosure [Line Items]          
Deferred compensation arrangement vesting period     5 years    
Compensation expense (reduction) 12,100 (7,000) $ 3,500 3,100  
Increase (decrease) in the fair value of marketable securities $ 12,700 $ (7,700) $ 3,000 $ 2,400  
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