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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		9 Months Ended
	Jan. 31, 2020	Jan. 31, 2019	Jan. 31, 2020	Jan. 31, 2019
Disaggregation of Revenue [Line Items]
Net sales transferred to customers	$ 34,225	$ 32,372	$ 113,283	$ 111,802
Over Time
Disaggregation of Revenue [Line Items]
Net sales transferred to customers	32,633	31,569	109,005	106,866
Point in Time
Disaggregation of Revenue [Line Items]
Net sales transferred to customers	1,592	803	4,278	4,936
Domestic
Disaggregation of Revenue [Line Items]
Net sales transferred to customers	26,699	25,217	87,570	91,909
Domestic | Over Time
Disaggregation of Revenue [Line Items]
Net sales transferred to customers	25,107	24,414	83,292	86,973
Domestic | Point in Time
Disaggregation of Revenue [Line Items]
Net sales transferred to customers	1,592	803	4,278	4,936
International
Disaggregation of Revenue [Line Items]
Net sales transferred to customers	7,526	7,155	25,713	19,893
International | Over Time
Disaggregation of Revenue [Line Items]
Net sales transferred to customers	7,526	7,155	25,713	19,893
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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-Publisher FASB
-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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