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Deferred Compensation and Retirement Plans - Total Long-Term Benefit Obligations (Detail) - USD ($) $ in Thousands | Apr. 30, 2021 | Apr. 30, 2020
--- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total benefit obligation |  | $ 364,793 | $ 308,279
Less: current portion of benefit obligation | [1] | (18,338) | (19,143)
Deferred compensation and other retirement plans |  | 346,455 | 289,136
Deferred Compensation and Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total benefit obligation |  | 178,994 | 156,586
Medical and Life Insurance Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total benefit obligation |  | 6,584 | 7,527
International Retirement Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total benefit obligation |  | 15,633 | 14,851
Executive Capital Accumulation Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total benefit obligation |  | $ 163,582 | $ 129,315
[1] | Current portion of benefit obligation is included in Compensation and benefits payable in the consolidated balance sheet

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