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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, 2012
Apr. 30, 2011
Apr. 30, 2010
Defined Benefit Plan Disclosure [Line Items]      
Benefit obligation, end of year $ 156,603 $ 144,638  
Less: current portion of benefit obligation (7,614) (5,080)  
Deferred Compensation Plans [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Benefit obligation, beginning of year 70,319 64,890 52,149
Service cost   137 339
Interest cost 3,346 3,495 3,557
Plan participants' contributions with interest   65 194
Actuarial loss (gain) 9,885 6,764 12,848
Benefits paid (5,071) (5,032) (4,197)
Benefit obligation, end of year 78,479 70,319 64,890
Less: current portion of benefit obligation (4,959) (3,682) (4,000)
Non-current benefit obligation 73,520 66,637 60,890
Pension Plan [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Benefit obligation, beginning of year 3,952 3,630 3,125
Interest cost 189 197 214
Actuarial loss (gain) 289 307 503
Benefits paid (216) (182) (212)
Benefit obligation, end of year 4,214 3,952 3,630
Less: current portion of benefit obligation (212) (137) (147)
Non-current benefit obligation 4,002 3,815 3,483
Executive Capital Accumulation Plan [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Benefit obligation, beginning of year 67,214 57,871  
Employee contributions 3,483 2,403  
Amortization of employer contributions 7,423 6,525  
Gain on investment 884 6,667 8,900
Employee distributions (7,661) (6,567)  
Exchange rate translations (209) 315  
Benefit obligation, end of year 71,134 67,214 57,871
Less: current portion of benefit obligation (2,443) (1,261)  
Non-current portion, end of year $ 68,691 $ 65,953