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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
	Jul. 31, 2021	Jul. 31, 2020
Disaggregation of Revenue [Line Items]
Total	$ 39,493	$ 36,423
Over Time
Disaggregation of Revenue [Line Items]
Total	38,482	35,445
Point in Time
Disaggregation of Revenue [Line Items]
Total	1,011	978
Domestic
Disaggregation of Revenue [Line Items]
Total	29,663	30,058
Domestic | Over Time
Disaggregation of Revenue [Line Items]
Total	28,652	29,080
Domestic | Point in Time
Disaggregation of Revenue [Line Items]
Total	1,011	978
International
Disaggregation of Revenue [Line Items]
Total	9,830	6,365
International | Over Time
Disaggregation of Revenue [Line Items]
Total	9,830	6,365
International | Point in Time
Disaggregation of Revenue [Line Items]
Total	$ 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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