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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, 2018	Jul. 31, 2017
Disaggregation of Revenue [Line Items]
Net sales transferred to customers	$ 42,152	$ 33,881
Over Time [Member]
Disaggregation of Revenue [Line Items]
Net sales transferred to customers	40,330
Point in Time [Member]
Disaggregation of Revenue [Line Items]
Net sales transferred to customers	1,822
Domestic [Member]
Disaggregation of Revenue [Line Items]
Net sales transferred to customers	36,070
Domestic [Member] | Over Time [Member]
Disaggregation of Revenue [Line Items]
Net sales transferred to customers	34,248
Domestic [Member] | Point in Time [Member]
Disaggregation of Revenue [Line Items]
Net sales transferred to customers	1,822
International [Member]
Disaggregation of Revenue [Line Items]
Net sales transferred to customers	6,082
International [Member] | Over Time [Member]
Disaggregation of Revenue [Line Items]
Net sales transferred to customers	$ 6,082

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ 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://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

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-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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