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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, 2020	Jul. 31, 2019
Disaggregation of Revenue [Line Items]
Net sales transferred to customers	$ 36,423	$ 39,336
Over Time
Disaggregation of Revenue [Line Items]
Net sales transferred to customers	35,445	38,284
Point in Time
Disaggregation of Revenue [Line Items]
Net sales transferred to customers	978	1,052
Domestic
Disaggregation of Revenue [Line Items]
Net sales transferred to customers	30,058	29,287
Domestic | Over Time
Disaggregation of Revenue [Line Items]
Net sales transferred to customers	29,080	28,235
Domestic | Point in Time
Disaggregation of Revenue [Line Items]
Net sales transferred to customers	978	1,052
International
Disaggregation of Revenue [Line Items]
Net sales transferred to customers	6,365	10,049
International | Over Time
Disaggregation of Revenue [Line Items]
Net sales transferred to customers	6,365	10,049
International | Point in Time
Disaggregation of Revenue [Line Items]
Net sales transferred to customers	$ 0	$ 0

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+ References

No definition available.

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- Definition

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://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045

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