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Deferred Compensation and Retirement Plans - Total Long-Term Benefit Obligations (Detail) - USD ($) $ in Thousands | Apr. 30, 2019 | Apr. 30, 2018
--- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |
Total benefit obligation | $ 275,453 | $ 249,720
Less: current portion of benefit obligation | (17,818) | (21,991)
Deferred compensation and other retirement plans | 257,635 | 227,729
Deferred Compensation and Pension Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total benefit obligation | 123,238 | 100,404
Medical and Life Insurance Plan |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total benefit obligation | 7,310 | 7,157
International Retirement Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total benefit obligation | 14,744 | 13,729
Executive Capital Accumulation Plan |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total benefit obligation | $ 130,161 | $ 128,430

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