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Retirement Benefits - Summary of Plan Assets by Asset Categories (Detail) - USD ($) $ in Thousands | Apr. 30, 2024 | Apr. 30, 2023 | Apr. 30, 2022
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, Plan asset | $ 0 | $ 17,732 | $ 18,867
Defined benefit plan, Plan asset percentage |  | 100.00% |
Equity Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, Plan asset |  | $ 12,724 |
Defined benefit plan, Plan asset percentage |  | 72.00% |
Fixed Income Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, Plan asset |  | $ 4,845 |
Defined benefit plan, Plan asset percentage |  | 27.00% |
Cash and Cash Equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, Plan asset |  | $ 163 |
Defined benefit plan, Plan asset percentage |  | 1.00% |

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