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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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Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

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Percentage of actual investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan.

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