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Revenue Recognition - Summary of Net Sales Transferred to Customers at a Point in Time and Over Time (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Oct. 31, 2023	Oct. 31, 2022	Oct. 31, 2023	Oct. 31, 2022
Disaggregation of Revenue [Line Items]
Net sales transferred to customers	$ 50,436	$ 54,564	$ 100,275	$ 104,687
Over Time
Disaggregation of Revenue [Line Items]
Net sales transferred to customers	49,020	52,947	97,343	100,955
Point in Time
Disaggregation of Revenue [Line Items]
Net sales transferred to customers	1,416	1,617	2,932	3,732
Domestic
Disaggregation of Revenue [Line Items]
Net sales transferred to customers	34,185	37,991	69,605	75,459
Domestic | Over Time
Disaggregation of Revenue [Line Items]
Net sales transferred to customers	32,769	36,374	66,673	71,727
Domestic | Point in Time
Disaggregation of Revenue [Line Items]
Net sales transferred to customers	1,416	1,617	2,932	3,732
International
Disaggregation of Revenue [Line Items]
Net sales transferred to customers	16,251	16,573	30,670	29,228
International | Over Time
Disaggregation of Revenue [Line Items]
Net sales transferred to customers	16,251	16,573	30,670	29,228
International | Point in Time
Disaggregation of Revenue [Line Items]
Net sales transferred to customers	$ 0	$ 0	$ 0	$ 0

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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