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Defined Benefit Pension Plans - Pension Expenses (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Oct. 31, 2021	Oct. 31, 2020	Oct. 31, 2021	Oct. 31, 2020
Retirement Benefits [Abstract]
Service cost	$ 0	$ 0	$ 0	$ 0
Interest cost	177	181	354	362
Expected return on plan assets	(401)	(321)	(802)	(642)
Recognition of net loss	135	429	270	857
Net periodic pension (income) expense	$ (89)	$ 289	$ (178)	$ 577

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