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Defined Benefit Pension Plans - Pension Expenses (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Oct. 31, 2023	Oct. 31, 2022	Oct. 31, 2023	Oct. 31, 2022
Retirement Benefits [Abstract]
Service cost	$ 0	$ 0	$ 0	$ 0
Interest cost	223	100	447	422
Expected return on plan assets	(328)	(166)	(656)	(701)
Recognition of net loss	145	74	290	314
Net periodic pension expense	$ 40	$ 8	$ 81	$ 35

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