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Income Taxes - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended
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Apr. 30, 2016 | May 02, 2015 | Apr. 26, 2014
Income Tax Disclosure [Abstract] |  |  |
Undistributed Earnings of Foreign Subsidiaries | $ 9,067 |  |
Operating Loss Carryforwards [Line Items] |  |  |
Deferred tax assets, gross | 21,445 | $ 18,315 |
Deferred tax asset valuation allowance | 1,673 | 52 | $ 2,297
Interest and penalties | 232 | 14 | $ 20
Accrued interest or penalties | 94 | $ 16 |
International |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Operating loss carryforwards | 6,428 |  |
Deferred tax assets, gross | 1,404 |  |
Canada |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Operating loss carryforwards | 219 |  |
Ireland and Belgium [Domain] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Deferred tax asset valuation allowance | $ 1,337 |  |

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- Definition Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32559-109319 + Details
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