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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, 2021	Jan. 31, 2020	Jan. 31, 2021	Jan. 31, 2020
Disaggregation of Revenue [Line Items]
Net sales transferred to customers	$ 33,339	$ 34,225	$ 108,762	$ 113,283
Over Time
Disaggregation of Revenue [Line Items]
Net sales transferred to customers	32,471	32,633	106,072	109,005
Point in Time
Disaggregation of Revenue [Line Items]
Net sales transferred to customers	868	1,592	2,690	4,278
Domestic
Disaggregation of Revenue [Line Items]
Net sales transferred to customers	25,066	26,699	83,896	87,570
Domestic | Over Time
Disaggregation of Revenue [Line Items]
Net sales transferred to customers	24,198	25,107	81,206	83,292
Domestic | Point in Time
Disaggregation of Revenue [Line Items]
Net sales transferred to customers	868	1,592	2,690	4,278
International
Disaggregation of Revenue [Line Items]
Net sales transferred to customers	8,273	7,526	24,866	25,713
International | Over Time
Disaggregation of Revenue [Line Items]
Net sales transferred to customers	8,273	7,526	24,866	25,713
International | Point in Time
Disaggregation of Revenue [Line Items]
Net sales transferred to customers	$ 0	$ 0	$ 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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