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Deferred Compensation and Retirement Plans - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Oct. 31, 2021
Oct. 31, 2020
Oct. 31, 2021
Oct. 31, 2020
Apr. 30, 2021
Defined Benefit Plan Disclosure [Line Items]          
Increase in market value of the underlying COLI investments     $ 2,184 $ 3,899  
Recognized investment income (expense) $ 4,800 $ 600 $ 10,000 12,000  
Minimum          
Defined Benefit Plan Disclosure [Line Items]          
Option to receive employee benefits by quarterly installments periods     1 year    
Maximum          
Defined Benefit Plan Disclosure [Line Items]          
Option to receive employee benefits by quarterly installments periods     15 years    
CSV of COLI Contracts          
Defined Benefit Plan Disclosure [Line Items]          
Increase in market value of the underlying COLI investments 1,700 1,800 $ 2,200 3,900  
Deferred Compensation Plan | CSV of COLI Contracts          
Defined Benefit Plan Disclosure [Line Items]          
Gross CSV 244,700   244,700   $ 241,300
Outstanding policy loans 80,000   $ 80,000   $ 80,000
Executive Capital Accumulation Plan          
Defined Benefit Plan Disclosure [Line Items]          
Deferred compensation arrangement vesting period     5 years    
Gain (loss) on deferred compensation plan $ 4,700 $ 600 $ 10,200 $ 11,800