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Deferred Compensation And Retirement Plans (Total Long-Term Benefit Obligations) (Detail) - USD ($) $ in Thousands | Apr. 30, 2018 | Apr. 30, 2017
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Defined Benefit Plan Disclosure [Line Items] |  |
Total benefit obligation | $ 249,720 | $ 231,348
Less: current portion of benefit obligation | (21,991) | (11,443)
Non-current benefit obligation | 227,729 | 219,905
Deferred Compensation and Pension Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total benefit obligation | 100,404 | 95,596
Medical and Life Insurance Plan |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total benefit obligation | 7,157 | 12,147
International Retirement Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total benefit obligation | 13,729 | 12,021
Executive Capital Accumulation Plan |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total benefit obligation | $ 128,430 | $ 111,584

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