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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, 2019	Oct. 31, 2018	Oct. 31, 2019	Oct. 31, 2018
Disaggregation of Revenue [Line Items]
Net sales transferred to customers	$ 39,722	$ 37,278	$ 79,058	$ 79,430
Over Time
Disaggregation of Revenue [Line Items]
Net sales transferred to customers	38,088	34,967	76,372	75,297
Point in Time
Disaggregation of Revenue [Line Items]
Net sales transferred to customers	1,634	2,311	2,686	4,133
Domestic
Disaggregation of Revenue [Line Items]
Net sales transferred to customers	31,584	30,622	60,871	66,692
Domestic | Over Time
Disaggregation of Revenue [Line Items]
Net sales transferred to customers	29,950	28,311	58,185	62,559
Domestic | Point in Time
Disaggregation of Revenue [Line Items]
Net sales transferred to customers	1,634	2,311	2,686	4,133
International
Disaggregation of Revenue [Line Items]
Net sales transferred to customers	8,138	6,656	18,187	12,738
International | Over Time
Disaggregation of Revenue [Line Items]
Net sales transferred to customers	8,138	6,656	18,187	12,738
International | Point in Time
Disaggregation of Revenue [Line Items]
Net sales transferred to customers	$ 0	$ 0	$ 0	$ 0

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No definition available.

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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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045

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-Name Accounting Standards Codification
-Topic 606
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045

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