XML 89 R52.htm IDEA: XBRL DOCUMENT v3.20.1
Deferred Compensation and Retirement Plans - Additional Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jan. 31, 2020
Jan. 31, 2019
Jan. 31, 2020
Jan. 31, 2019
Apr. 30, 2019
Defined Benefit Plan Disclosure [Line Items]          
Increase in market value of the underlying COLI investments     $ 5,794 $ 4,547  
Recognized investment income (expense) $ 5,200 $ 2,200 8,341 1,330  
Executive Capital Accumulation Plan          
Defined Benefit Plan Disclosure [Line Items]          
Gain (loss) on deferred compensation plan 5,000 2,200 $ 8,600 2,000  
Minimum          
Defined Benefit Plan Disclosure [Line Items]          
Option to receive employee benefits by quarterly installments periods     1 year    
Minimum | Executive Capital Accumulation Plan          
Defined Benefit Plan Disclosure [Line Items]          
Deferred compensation arrangement vesting period     4 years    
Maximum          
Defined Benefit Plan Disclosure [Line Items]          
Option to receive employee benefits by quarterly installments periods     15 years    
Maximum | Executive Capital Accumulation Plan          
Defined Benefit Plan Disclosure [Line Items]          
Deferred compensation arrangement vesting period     5 years    
CSV of COLI Contracts          
Defined Benefit Plan Disclosure [Line Items]          
Gross CSV 237,600   $ 237,600   $ 219,200
Outstanding policy loans 92,300   92,300   $ 93,200
Increase in market value of the underlying COLI investments $ 1,600 $ 1,500 $ 5,800 $ 4,500