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Income Taxes - Narrative (Details) - USD ($) $ in Thousands | Apr. 28, 2018 | Apr. 29, 2017
--- | --- | ---
Operating Loss Carryforwards [Line Items] |  |
Deferred tax assets, gross | $ 15,532 | $ 21,845
Deferred tax asset valuation allowance | 1,506 | 2,061
Accrued interest or penalties | 238 | $ 170
International |  |
Operating Loss Carryforwards [Line Items] |  |
Operating loss carryforwards | 7,223 |
Deferred tax assets, gross | 1,286 |
Canada |  |
Operating Loss Carryforwards [Line Items] |  |
Operating loss carryforwards | 62 |
Ireland and Belgium [Domain] |  |
Operating Loss Carryforwards [Line Items] |  |
Deferred tax asset valuation allowance | $ 1,279 |

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards. + 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 (b) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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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 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=84230637&loc=d3e32559-109319 + Details
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- Definition Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 + Details
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