Annual report pursuant to Section 13 and 15(d)

Deferred Compensation And Retirement Plans (Reconciliation Of Benefit Obligation) (Detail)

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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, 2013
Apr. 30, 2012
Apr. 30, 2011
Defined Benefit Plan Disclosure [Line Items]      
Benefit obligation, end of year $ 169,657 $ 156,603  
Less: current portion of benefit obligation (9,951) (14,026)  
Non-current benefit obligation 159,706 142,577  
Deferred Compensation Plan
     
Defined Benefit Plan Disclosure [Line Items]      
Benefit obligation, beginning of year 78,479 70,319 64,890
Service cost     137
Interest cost 2,868 3,346 3,495
Employee contributions     65
Actuarial loss (gain) 9,420 9,885 6,764
Benefits paid (5,205) (5,071) (5,032)
Benefit obligation, end of year 85,562 78,479 70,319
Less: current portion of benefit obligation (5,182) (4,959) (3,682)
Non-current benefit obligation 80,380 73,520 66,637
Pension Plans, Defined Benefit
     
Defined Benefit Plan Disclosure [Line Items]      
Benefit obligation, beginning of year 4,214 3,952 3,630
Interest cost 154 189 197
Actuarial loss (gain) 426 289 307
Benefits paid (258) (216) (182)
Benefit obligation, end of year 4,536 4,214 3,952
Less: current portion of benefit obligation (232) (212) (137)
Non-current benefit obligation 4,304 4,002 3,815
Executive Capital Accumulation Plan
     
Defined Benefit Plan Disclosure [Line Items]      
Benefit obligation, beginning of year 71,134 67,214  
Employee contributions 1,943 3,483  
Amortization of employer contributions 9,010 7,423  
Gain on investment 6,281 884 6,700
Benefits paid (12,244) (7,661)  
Exchange rate translations (211) (209)  
Benefit obligation, end of year 75,913 71,134 67,214
Less: current portion of benefit obligation (4,537) (8,855)  
Non-current benefit obligation $ 71,376 $ 62,279