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Deferred Compensation And Retirement Plans (Total Long-Term Benefit Obligations) (Detail) (USD $)
In Thousands, unless otherwise specified
Apr. 30, 2012
Apr. 30, 2011
Apr. 30, 2010
Apr. 30, 2009
Defined Benefit Plan Disclosure [Line Items]        
Total benefit obligation $ 156,603 $ 144,638    
Less: current portion of benefit obligation (7,614) (5,080)    
Non-current benefit obligation 148,989 139,558    
Deferred Compensation Plans [Member]
        
Defined Benefit Plan Disclosure [Line Items]        
Total benefit obligation 78,479 70,319 64,890 52,149
Less: current portion of benefit obligation (4,959) (3,682) (4,000)  
Pension Plan [Member]
        
Defined Benefit Plan Disclosure [Line Items]        
Total benefit obligation 4,214 3,952 3,630 3,125
Less: current portion of benefit obligation (212) (137) (147)  
Retirement Plans [Member]
        
Defined Benefit Plan Disclosure [Line Items]        
Total benefit obligation 2,776 3,153    
Executive Capital Accumulation Plan [Member]
        
Defined Benefit Plan Disclosure [Line Items]        
Total benefit obligation $ 71,134 $ 67,214 $ 57,871