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Deferred Compensation And Retirement Plans (Total Long-Term Benefit Obligations) (Detail) (USD $)
In Thousands, unless otherwise specified
Apr. 30, 2014
Apr. 30, 2013
Apr. 30, 2012
Apr. 30, 2011
Defined Benefit Plan Disclosure [Line Items]        
Total benefit obligation $ 179,612 $ 169,657    
Less: current portion of benefit obligation (10,377) (9,951)    
Non-current benefit obligation 169,235 159,706    
Deferred Compensation Plan
        
Defined Benefit Plan Disclosure [Line Items]        
Total benefit obligation 82,153 85,562 78,479 70,319
Less: current portion of benefit obligation (5,593) (5,182) (4,959)  
Non-current benefit obligation 76,560 80,380 73,520  
Pension Plans, Defined Benefit
        
Defined Benefit Plan Disclosure [Line Items]        
Total benefit obligation 4,424 4,536 4,214 3,952
Less: current portion of benefit obligation (274) (232) (212)  
Non-current benefit obligation 4,150 4,304 4,002  
International Retirement Plans
        
Defined Benefit Plan Disclosure [Line Items]        
Total benefit obligation 3,727 3,646    
Executive Capital Accumulation Plan
        
Defined Benefit Plan Disclosure [Line Items]        
Total benefit obligation 89,308 75,913 71,134  
Less: current portion of benefit obligation (4,510) (4,537)    
Non-current benefit obligation $ 84,798 $ 71,376