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Income Taxes - Summary of Valuation Allowances Against Deferred Income Taxes (Detail) - USD ($) $ in Thousands | Apr. 29, 2018 | Apr. 30, 2017 | May 01, 2016 | May 03, 2015
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Valuation Allowance [Line Items] |  |  |  |
valuation allowance | $ 5,204 | $ 536 | $ 590 | $ 922
U.S. State Tax [Member] | Loss Carryforwards and Credits [Member] |  |  |  |
Valuation Allowance [Line Items] |  |  |  |
valuation allowance | 578 | 464 |  |
U.S. [Member] | Income Tax Credits [Member] |  |  |  |
Valuation Allowance [Line Items] |  |  |  |
valuation allowance | 4,550 |  |  |
Poland [Member] | Loss Carryforwards [Member] |  |  |  |
Valuation Allowance [Line Items] |  |  |  |
valuation allowance | $ 76 | $ 72 |  |

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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://www.xbrl.org/2003/role/presentationRef -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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