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Retirement Benefits - Summary of Expected Benefit Payments (Detail) $ in Thousands	Apr. 30, 2019 USD ($)
Retirement Benefits [Abstract]
2020	$ 1,380
2021	1,440
2022	1,460
2023	1,480
2024	1,520
2025 & Beyond	$ 7,210

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Amount of benefits for defined benefit plan expected to be paid in five fiscal years after fifth fiscal year following latest fiscal year.

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Amount of benefits for defined benefit plan expected to be paid in next fiscal year following latest fiscal year.

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Amount of benefits for defined benefit plan expected to be paid in fourth fiscal year following latest fiscal year.

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