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Retirement Benefits - Summary of Components of Net Periodic Pension Cost (Detail) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2019	Apr. 30, 2018
Retirement Benefits [Abstract]
Interest cost	$ 859	$ 875
Expected return on plan assets	(1,448)	(1,314)
Recognition of net loss	884	1,133
Net periodic pension cost	$ 295	$ 694

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Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan.

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