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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, 2021	Oct. 31, 2020	Oct. 31, 2021	Oct. 31, 2020
Disaggregation of Revenue [Line Items]
Total	$ 39,031	$ 39,000	$ 78,524	$ 75,423
Over Time
Disaggregation of Revenue [Line Items]
Total	37,547	37,178	76,029	72,623
Point in Time
Disaggregation of Revenue [Line Items]
Total	1,484	1,822	2,495	2,800
Domestic
Disaggregation of Revenue [Line Items]
Total	29,934	28,772	59,597	58,830
Domestic | Over Time
Disaggregation of Revenue [Line Items]
Total	28,450	26,950	57,102	56,030
Domestic | Point in Time
Disaggregation of Revenue [Line Items]
Total	1,484	1,822	2,495	2,800
International
Disaggregation of Revenue [Line Items]
Total	9,097	10,228	18,927	16,593
International | Over Time
Disaggregation of Revenue [Line Items]
Total	9,097	10,228	18,927	16,593
International | Point in Time
Disaggregation of Revenue [Line Items]
Total	$ 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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