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Defined Benefit Pension Plans - Pension Expenses (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Oct. 31, 2022	Oct. 31, 2021	Oct. 31, 2022	Oct. 31, 2021
Retirement Benefits [Abstract]
Service cost	$ 0	$ 0	$ 0	$ 0
Interest cost	100	177	422	354
Expected return on plan assets	(166)	(401)	(701)	(802)
Recognition of net loss	74	135	314	270
Net periodic pension expense (income)	$ 8	$ (89)	$ 35	$ (178)

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