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Deferred Compensation and Retirement Plans - Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jan. 31, 2025
Jan. 31, 2024
Jan. 31, 2025
Jan. 31, 2024
Apr. 30, 2024
Defined Benefit Plan Disclosure [Line Items]          
Increase in market value of the underlying COLI investments     $ 7,253 $ 6,444  
CSV of COLI Contracts          
Defined Benefit Plan Disclosure [Line Items]          
Increase in market value of the underlying COLI investments $ 2,500 $ 2,500 7,300 6,400  
Deferred Compensation Plan | CSV of COLI Contracts          
Defined Benefit Plan Disclosure [Line Items]          
Gross CSV 330,500   330,500   $ 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) 8,800 22,500 $ 27,100 22,700  
Increase (decrease) in the fair value of marketable securities $ 9,100 $ 23,800 $ 28,000 $ 22,800  
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