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Deferred Compensation And Retirement Plans (Expected Benefit Payments Associated With Future Service) (Detail)
$ in Thousands
Apr. 30, 2015
USD ($)
Deferred Compensation Plan  
Defined Benefit Plan Disclosure [Line Items]  
2016 $ 6,487
2017 6,418
2018 6,192
2019 6,096
2020 6,375
2021-2025 30,904
Pension Plans, Defined Benefit  
Defined Benefit Plan Disclosure [Line Items]  
2016 322
2017 328
2018 331
2019 327
2020 331
2021-2025 $ 1,487