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Defined Benefit Pension Plans - Pension Expenses (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jan. 31, 2023	Jan. 31, 2022	Jan. 31, 2023	Jan. 31, 2022
Retirement Benefits [Abstract]
Service cost	$ 0	$ 0	$ 0	$ 0
Interest cost	211	177	633	531
Expected return on plan assets	(350)	(401)	(1,051)	(1,203)
Recognition of net loss	157	136	471	406
Net periodic pension expense (income)	$ 18	$ (88)	$ 53	$ (266)

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