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Deferred Compensation And Retirement Plans (Reconciliation Of Benefit Obligation) (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Apr. 30, 2014
Apr. 30, 2013
Apr. 30, 2012
Defined Benefit Plan Disclosure [Line Items]      
Benefit obligation, end of year $ 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]      
Benefit obligation, beginning of year 85,562 78,479 70,319
Interest cost 2,566 2,868 3,346
Actuarial (gain) loss (294) 9,420 9,885
Benefits paid (5,681) (5,205) (5,071)
Benefit obligation, end of year 82,153 85,562 78,479
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]      
Benefit obligation, beginning of year 4,536 4,214 3,952
Interest cost 137 154 189
Actuarial (gain) loss 92 426 289
Benefits paid (341) (258) (216)
Benefit obligation, end of year 4,424 4,536 4,214
Less: current portion of benefit obligation (274) (232) (212)
Non-current benefit obligation 4,150 4,304 4,002
Executive Capital Accumulation Plan
      
Defined Benefit Plan Disclosure [Line Items]      
Benefit obligation, beginning of year 75,913 71,134  
Employee contributions 2,748 1,943  
Amortization of employer contributions 11,467 9,010  
Gain on investment 8,884 6,281 900
Benefits paid (9,044) (12,244)  
Exchange rate fluctuations (660) (211)  
Benefit obligation, end of year 89,308 75,913 71,134
Less: current portion of benefit obligation (4,510) (4,537)  
Non-current benefit obligation $ 84,798 $ 71,376