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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, 2018	Oct. 31, 2017	Oct. 31, 2018	Oct. 31, 2017
Disaggregation of Revenue [Line Items]
Net sales transferred to customers	$ 37,278	$ 41,471	$ 79,430	$ 75,352
Over Time [Member]
Disaggregation of Revenue [Line Items]
Net sales transferred to customers	34,967		75,297
Point in Time [Member]
Disaggregation of Revenue [Line Items]
Net sales transferred to customers	2,311		4,133
Domestic [Member]
Disaggregation of Revenue [Line Items]
Net sales transferred to customers	30,622		66,692
Domestic [Member] | Over Time [Member]
Disaggregation of Revenue [Line Items]
Net sales transferred to customers	28,311		62,559
Domestic [Member] | Point in Time [Member]
Disaggregation of Revenue [Line Items]
Net sales transferred to customers	2,311		4,133
International [Member]
Disaggregation of Revenue [Line Items]
Net sales transferred to customers	6,656		12,738
International [Member] | Over Time [Member]
Disaggregation of Revenue [Line Items]
Net sales transferred to customers	$ 6,656		$ 12,738

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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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