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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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- 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 + Details
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