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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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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.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 20
-Section 50
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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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