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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								12 Months Ended
	Apr. 30, 2022	Jan. 31, 2022	Oct. 31, 2021	Jul. 31, 2021	Apr. 30, 2021	Jan. 31, 2021	Oct. 31, 2020	Jul. 31, 2020	Apr. 30, 2022	Apr. 30, 2021
Disaggregation of Revenue [Line Items]
Net sales transferred to customers	$ 49,715	$ 40,633	$ 39,031	$ 39,493	$ 38,707	$ 33,339	$ 39,000	$ 36,423	$ 168,872	$ 147,469
Over Time
Disaggregation of Revenue [Line Items]
Net sales transferred to customers									162,013	144,009
Point in Time
Disaggregation of Revenue [Line Items]
Net sales transferred to customers									6,859	3,460
Domestic
Disaggregation of Revenue [Line Items]
Net sales transferred to customers									126,848	111,035
Domestic | Over Time
Disaggregation of Revenue [Line Items]
Net sales transferred to customers									119,989	107,575
Domestic | Point in Time
Disaggregation of Revenue [Line Items]
Net sales transferred to customers									6,859	3,460
International
Disaggregation of Revenue [Line Items]
Net sales transferred to customers									42,024	36,434
International | Over Time
Disaggregation of Revenue [Line Items]
Net sales transferred to customers									42,024	36,434
International | Point in Time
Disaggregation of Revenue [Line Items]
Net sales transferred to customers									$ 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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