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Income Taxes - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended
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Apr. 29, 2017 | Apr. 30, 2016 | May 02, 2015
Income Tax Disclosure [Abstract] |  |  |
Undistributed Earnings of Foreign Subsidiaries | $ 11,483 |  |
Operating Loss Carryforwards [Line Items] |  |  |
Deferred tax assets, gross | 21,845 | $ 21,445 |
Deferred tax asset valuation allowance | 2,061 | 1,673 |
Interest and penalties | (59) | 232 | $ 14
Accrued interest or penalties | 170 | $ 94 |
International |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Operating loss carryforwards | 7,754 |  |
Deferred tax assets, gross | 1,772 |  |
Canada |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Operating loss carryforwards | 138 |  |
Ireland and Belgium [Domain] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Deferred tax asset valuation allowance | $ 1,724 |  |

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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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