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Deferred Compensation And Retirement Plans (Reconciliation Of Benefit Obligation) (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Apr. 30, 2018
Apr. 30, 2017
Apr. 30, 2016
Defined Benefit Plan Disclosure [Line Items]      
Total liability $ 249,720 $ 231,348  
Deferred Compensation Plan      
Defined Benefit Plan Disclosure [Line Items]      
Benefit obligation, beginning of period 121,042 124,566  
Service cost 11,691 5,507  
Interest cost 3,469 3,820 $ 3,423
Actuarial gain (1,574) (4,791)  
Administrative expenses paid (166)    
Benefits paid from plan assets (1,833) (1,884)  
Benefits paid from cash (6,135) (6,176)  
Benefit obligation, end of year 126,494 121,042 124,566
Fair value of plan assets, beginning of year 25,446 24,867  
Actual return on plan assets 2,425 2,463  
Benefits paid from plan assets (1,833) (1,884)  
Administrative expenses paid (166)    
Employer contributions 218    
Fair value of plan assets, end of year 26,090 25,446 24,867
Funded status and balance, end of year [1] (100,404) (95,596)  
Current liability 6,496 6,182  
Non-current liability 93,908 89,414  
Total liability $ 100,404 $ 95,596  
Plan assets weighted average allocation 100.00% 100.00%  
Deferred Compensation Plan | Equity Securities      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets weighted average allocation 44.00% 54.00%  
Deferred Compensation Plan | Debt Securities      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets weighted average allocation 55.00% 46.00%  
Deferred Compensation Plan | Other securities      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets weighted average allocation 1.00%    
Executive Capital Accumulation Plan      
Defined Benefit Plan Disclosure [Line Items]      
Benefit obligation, beginning of period $ 111,584 $ 105,676  
Employee contributions 5,036 5,349  
Amortization of employer contributions 12,175 13,667  
Gain on investment 11,095 10,565  
Benefits paid from cash (11,923) (23,044)  
Exchange rate fluctuations 463 (629)  
Benefit obligation, end of year 128,430 111,584 $ 105,676
Current liability 14,827 4,496  
Non-current liability 113,603 107,088  
Total liability $ 128,430 $ 111,584  
[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 of April 30, 2018 and 2017, the Company held contracts with gross CSV of $186.8 million and $180.3 million, offset by outstanding policy loans of $66.7 million and $67.2 million, respectively.