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Deferred Compensation and Retirement Plans - Components Of Net Periodic Benefit Costs (Detail) - Medical And Life Insurance Benefits - Hay Group - USD ($) $ in Thousands | 12 Months Ended
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Apr. 30, 2024 | Apr. 30, 2023 | Apr. 30, 2022
Defined Benefit Plan Disclosure [Line Items] |  |  |
Service cost | $ 0 | $ 0 | $ 0
Interest cost | 217 | 195 | 110
Net prior service credit amortization | (308) | (308) | (308)
Amortization of actuarial gain | (83) | (74) | 0
Net periodic benefit cost | $ (174) | $ (187) | $ (198)

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