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Retirement Benefits - Summary of Plan Assets by Asset Categories (Detail) - USD ($) $ in Thousands | Apr. 30, 2019 | Apr. 30, 2018 | Apr. 30, 2017
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, Plan asset | $ 19,035 | $ 18,540 | $ 17,198
Defined benefit plan, Plan asset percentage | 100.00% | 100.00% |
Equity Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, Plan asset | $ 14,085 | $ 9,643 |
Defined benefit plan, Plan asset percentage | 74.00% | 52.00% |
Fixed Income |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, Plan asset | $ 4,754 | $ 4,599 |
Defined benefit plan, Plan asset percentage | 25.00% | 25.00% |
Cash and Cash Equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, Plan asset | $ 196 | $ 4,298 |
Defined benefit plan, Plan asset percentage | 1.00% | 23.00% |

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