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Retirement Benefits - Summary of Plan Assets by Asset Categories (Detail) - USD ($) $ in Thousands | Apr. 30, 2022 | Apr. 30, 2021 | Apr. 30, 2020
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, Plan asset | $ 18,867 | $ 21,459 | $ 17,316
Defined benefit plan, Plan asset percentage | 100.00% | 100.00% |
Equity Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, Plan asset | $ 13,856 | $ 14,814 |
Defined benefit plan, Plan asset percentage | 73.00% | 69.00% |
Fixed Income |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, Plan asset | $ 4,703 | $ 6,314 |
Defined benefit plan, Plan asset percentage | 25.00% | 29.00% |
Cash and Cash Equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, Plan asset | $ 308 | $ 331 |
Defined benefit plan, Plan asset percentage | 2.00% | 2.00% |

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