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Deferred Compensation And Retirement Plans (Reconciliation Of Benefit Obligation) (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Apr. 30, 2016
Apr. 30, 2015
Apr. 30, 2014
Deferred Compensation Plan      
Defined Benefit Plan Disclosure [Line Items]      
Benefit obligation, at acquisition date $ 83,876 $ 82,153 $ 85,562
Interest cost 2,644 2,835 2,566
Actuarial loss 1,720 4,863 (294)
Benefits paid (5,694) (5,975) (5,681)
Benefit obligation, end of year 82,546 83,876 82,153
Less: current portion of benefit obligation (5,446) (5,554) (5,593)
Non-current benefit obligation 77,100 78,322 76,560
Pension Plans, Defined Benefit      
Defined Benefit Plan Disclosure [Line Items]      
Benefit obligation, at acquisition date 5,262 4,424 4,536
Interest cost 167 154 137
Actuarial loss 122 1,001 92
Benefits paid (332) (317) (341)
Benefit obligation, end of year 5,219 5,262 4,424
Less: current portion of benefit obligation (289) (278) (274)
Non-current benefit obligation 4,930 4,984 4,150
Executive Capital Accumulation Plan      
Defined Benefit Plan Disclosure [Line Items]      
Benefit obligation, at acquisition date 99,461 89,308  
Employee contributions 7,015 3,048  
Amortization of employer contributions 16,439 12,378  
(Gain) loss on investment (1,654) 5,871 8,900
Benefits paid (15,201) (10,295)  
Exchange rate fluctuations (384) (849)  
Benefit obligation, end of year 105,676 99,461 $ 89,308
Less: current portion of benefit obligation (11,092) (12,182)  
Non-current benefit obligation $ 94,584 $ 87,279