Quarterly report pursuant to Section 13 or 15(d)

Deferred Compensation and Retirement Plans - Additional Information (Detail)

v3.21.2
Deferred Compensation and Retirement Plans - Additional Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Jul. 31, 2021
Jul. 31, 2020
Apr. 30, 2021
Defined Benefit Plan Disclosure [Line Items]      
Increase in market value of the underlying COLI investments $ 531 $ 2,105  
Recognized investment income (expense) $ 5,200 11,500  
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 $ 500 2,100  
Deferred Compensation Plan | CSV of COLI Contracts      
Defined Benefit Plan Disclosure [Line Items]      
Gross CSV 243,200   $ 241,300
Outstanding policy loans $ 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 $ 5,400 $ 11,200