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Defined Benefit Pension Plans - Pension Expenses (Detail) - USD ($) $ in Thousands	3 Months Ended
	Jul. 31, 2021	Jul. 31, 2020
Retirement Benefits [Abstract]
Service cost	$ 0	$ 0
Interest cost	177	181
Expected return on plan assets	(401)	(321)
Recognition of net loss	135	428
Net periodic pension (income) expense	$ (89)	$ 288

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