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Defined Benefit Pension Plans - Pension Expenses (Detail) - USD ($) $ in Thousands	3 Months Ended
	Jul. 31, 2023	Jul. 31, 2022
Retirement Benefits [Abstract]
Service cost	$ 0	$ 0
Interest cost	224	322
Expected return on plan assets	(328)	(535)
Recognition of net loss	145	240
Net periodic pension expense	$ 41	$ 27

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