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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, 2021	Jan. 31, 2021	Oct. 31, 2020	Jul. 31, 2020	Apr. 30, 2020	Jan. 31, 2020	Oct. 31, 2019	Jul. 31, 2019	Apr. 30, 2021	Apr. 30, 2020
Disaggregation of Revenue [Line Items]
Net sales transferred to customers	$ 38,707	$ 33,339	$ 39,000	$ 36,423	$ 34,257	$ 34,225	$ 39,722	$ 39,336	$ 147,469	$ 147,540
Over Time
Disaggregation of Revenue [Line Items]
Net sales transferred to customers									144,009	142,419
Point in Time
Disaggregation of Revenue [Line Items]
Net sales transferred to customers									3,460	5,121
Domestic
Disaggregation of Revenue [Line Items]
Net sales transferred to customers									111,035	115,103
Domestic | Over Time
Disaggregation of Revenue [Line Items]
Net sales transferred to customers									107,575	109,982
Domestic | Point in Time
Disaggregation of Revenue [Line Items]
Net sales transferred to customers									3,460	5,121
International
Disaggregation of Revenue [Line Items]
Net sales transferred to customers									36,434	32,437
International | Over Time
Disaggregation of Revenue [Line Items]
Net sales transferred to customers									36,434	32,437
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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