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Deferred Compensation And Retirement Plans (Reconciliation Of Benefit Obligation) (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Apr. 30, 2015
Apr. 30, 2014
Apr. 30, 2013
Apr. 30, 2015
Apr. 30, 2014
Apr. 30, 2013
Defined Benefit Plan Disclosure [Line Items]            
Benefit obligation, beginning of year $ 179,612          
Benefit obligation, end of year 191,446 $ 179,612        
Less: current portion of benefit obligation       $ (18,014) $ (10,377)  
Non-current benefit obligation       173,432 169,235  
Benefit obligation, end of year 179,612 179,612   191,446 179,612  
Deferred Compensation Plan            
Defined Benefit Plan Disclosure [Line Items]            
Benefit obligation, beginning of year 82,153 85,562 $ 78,479      
Interest cost 2,835 2,566 2,868      
Actuarial loss 4,863 (294) 9,420      
Benefits paid (5,975) (5,681) (5,205)      
Benefit obligation, end of year 83,876 82,153 85,562      
Less: current portion of benefit obligation       (5,554) (5,593) $ (5,182)
Non-current benefit obligation       78,322 76,560 80,380
Benefit obligation, end of year 82,153 85,562 78,479 83,876 82,153 85,562
Pension Plans, Defined Benefit            
Defined Benefit Plan Disclosure [Line Items]            
Benefit obligation, beginning of year 4,424 4,536 4,214      
Interest cost 154 137 154      
Actuarial loss 1,001 92 426      
Benefits paid (317) (341) (258)      
Benefit obligation, end of year 5,262 4,424 4,536      
Less: current portion of benefit obligation       (278) (274) (232)
Non-current benefit obligation       4,984 4,150 4,304
Benefit obligation, end of year 4,424 4,536 4,214 5,262 4,424 4,536
Executive Capital Accumulation Plan            
Defined Benefit Plan Disclosure [Line Items]            
Benefit obligation, beginning of year 89,308 75,913        
Employee contributions 3,048 2,748        
Amortization of employer contributions 12,378 11,467        
Gain on investment 5,871 8,884 6,300      
Benefits paid (10,295) (9,044)        
Exchange rate fluctuations (849) (660)        
Benefit obligation, end of year 99,461 89,308 75,913      
Less: current portion of benefit obligation       (12,182) (4,510)  
Non-current benefit obligation       87,279 84,798  
Benefit obligation, end of year $ 89,308 $ 75,913 $ 75,913 $ 99,461 $ 89,308 $ 75,913