Annual report pursuant to Section 13 and 15(d)

Deferred Compensation And Retirement Plans - Reconciliation Of Benefit Obligation (Detail)

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Deferred Compensation And Retirement Plans - Reconciliation Of Benefit Obligation (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Apr. 30, 2022
Apr. 30, 2021
Apr. 30, 2020
Defined Benefit Plan Disclosure [Line Items]      
Total benefit obligation $ 376,091 $ 364,793  
Deferred Compensation Plan      
Defined Benefit Plan Disclosure [Line Items]      
Benefit obligation, beginning of year 205,740 180,821  
Service cost 37,952 31,947 $ 24,939
Interest cost 4,028 4,035 5,433
Actuarial gain (25,757) (590)  
Administrative expenses paid (196) (265)  
Benefits paid from plan assets (2,543) (2,327)  
Benefits paid from cash (7,626) (7,881)  
Benefit obligation, end of year 211,598 205,740 180,821
Fair value of plan assets, beginning of year 26,746 24,235  
Actual return on plan assets (2,113) 4,523  
Benefits paid from plan assets (2,543) (2,327)  
Administrative expenses paid (196) (265)  
Employer contributions 96 580  
Fair value of plan assets, end of year 21,990 26,746 24,235
Funded status and balance, end of year [1] (189,608) (178,994)  
Current liability 8,833 9,074  
Non-current liability 180,775 169,920  
Total benefit obligation $ 189,608 $ 178,994  
Plan assets weighted average allocation 100.00% 100.00%  
Deferred Compensation Plan | Debt Securities      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets weighted average allocation 42.00% 36.00%  
Deferred Compensation Plan | Equity Securities      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets weighted average allocation 55.00% 62.00%  
Deferred Compensation Plan | Other securities      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets weighted average allocation 3.00% 2.00%  
Executive Capital Accumulation Plan      
Defined Benefit Plan Disclosure [Line Items]      
Benefit obligation, beginning of year $ 163,582 $ 129,315  
Employee contributions 8,541 4,935  
Amortization of employer contributions 7,060 6,287  
(Loss) gain on investment (10,602) 37,323  
Benefits paid from cash (10,880) (15,652)  
Exchange rate fluctuations (598) 1,374  
Benefit obligation, end of year 166,723 163,582 $ 129,315
Current liability 9,498 8,663  
Non-current liability 157,225 154,919  
Total benefit obligation 166,723 $ 163,582  
Executive Capital Accumulation Plan | Lucas Group      
Defined Benefit Plan Disclosure [Line Items]      
Acquisition of Lucas Group $ 9,620    
[1] The Company purchased COLI contracts insuring the lives of certain employees eligible to participate in the deferred compensation and pension plans as a means of funding benefits under such plans. As the COLI contracts are held in trust and are not separated from our general corporate assets, they are not included in the funded status. As of April 30, 2022 and 2021, the Company held contracts with gross CSV of $263.2 million and $241.3 million, offset by outstanding policy loans of $79.8 million and $80.0 million, respectively.