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Deferred Compensation and Retirement Plans - Schedule of Total Long-Term Benefit Obligations (Detail) - USD ($) $ in Thousands | Apr. 30, 2025 | Apr. 30, 2024
--- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |
Total liability | $ 526,388 | $ 483,773
Less: current portion of benefit obligation | (48,618) | (43,377)
Non-current benefit obligation | 477,770 | 440,396
Deferred compensation and pension plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total liability | 298,316 | 262,403
Medical and Life Insurance plan |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total liability | 4,188 | 4,227
International retirement plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total liability | 13,278 | 12,606
Executive Capital Accumulation Plan |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total liability | $ 210,606 | $ 204,537

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