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Retirement Benefits - Summary of Plan Assets by Asset Categories (Detail) - USD ($) $ in Thousands	Apr. 30, 2021	Apr. 30, 2020	Apr. 30, 2019
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, Plan asset	$ 21,459	$ 17,316	$ 19,035
Defined benefit plan, Plan asset percentage	100.00%	100.00%
Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, Plan asset	$ 14,814	$ 10,797
Defined benefit plan, Plan asset percentage	69.00%	62.00%
Fixed Income
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, Plan asset	$ 6,314	$ 5,377
Defined benefit plan, Plan asset percentage	29.00%	31.00%
Cash and Cash Equivalents
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, Plan asset	$ 331	$ 1,142
Defined benefit plan, Plan asset percentage	2.00%	7.00%

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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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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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