Annual report pursuant to Section 13 and 15(d)

Deferred Compensation And Retirement Plans (Expected Benefit Payments Associated With Future Service) (Detail)

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Deferred Compensation And Retirement Plans (Expected Benefit Payments Associated With Future Service) (Detail) (USD $)
In Thousands, unless otherwise specified
Apr. 30, 2013
Deferred Compensation Plan
 
Defined Benefit Plan Disclosure [Line Items]  
2014 $ 6,602
2015 6,515
2016 6,789
2017 6,520
2018 6,184
2019-2023 30,853
Pension Plans, Defined Benefit
 
Defined Benefit Plan Disclosure [Line Items]  
2014 313
2015 319
2016 320
2017 316
2018 274
2019-2023 $ 1,335