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Income Taxes - Summary of Valuation Allowances Against Deferred Income Taxes (Detail) - USD ($) $ in Thousands | Oct. 28, 2018 | Apr. 29, 2018 | Oct. 29, 2017
--- | --- | --- | ---
Valuation Allowance [Line Items] |  |  |
Valuation allowance | $ 5,306 | $ 5,204 | $ 632
U.S. State Tax [Member] | Loss Carryforwards and Credits [Member] |  |  |
Valuation Allowance [Line Items] |  |  |
Valuation allowance | 756 | 578 | 554
Internal Revenue Service (IRS) [Member] | Income Tax Credits [Member] |  |  |
Valuation Allowance [Line Items] |  |  |
Valuation allowance | $ 4,550 | 4,550 |
Poland [Member] | Loss Carryforwards [Member] |  |  |
Valuation Allowance [Line Items] |  |  |
Valuation allowance |  | $ 76 | $ 78

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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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- Definition 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. + Details
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