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Defined Benefit Pension Plans - Pension Expenses (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jan. 31, 2024	Jan. 31, 2023	Jan. 31, 2024	Jan. 31, 2023
Retirement Benefits [Abstract]
Service cost	$ 0	$ 0	$ 0	$ 0
Interest cost	223	211	670	633
Expected return on plan assets	(328)	(350)	(984)	(1,051)
Recognition of net loss	146	157	436	471
Net periodic pension expense	$ 41	$ 18	$ 122	$ 53

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