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Income Taxes - Narrative (Details) (USD $) | 12 Months Ended
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Apr. 26, 2014 | Apr. 27, 2013 | Apr. 28, 2012
Income Tax Disclosure [Abstract] |  |  |
Research tax credits | $ 750,000 | $ 1,804,000 | $ 1,004,000
Change in foreign deferred rates | 0 | 0 | 249,000
Deferred tax asset valuation allowance | 2,297,000 | 0 |
Operating Loss Carryforwards [Line Items] |  |  |
Deferred tax assets, gross | 21,931,000 | 22,188,000 |
Interest and penalties | 20,000 | 10,000 | (1,000)
Accrued interest or penalties | 15,000 | 11,000 |
International |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Operating loss carryforwards | 2,300,000 |  |
Deferred tax assets, gross | $ 766,000 | $ 0 |

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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to foreign income tax expense (benefit). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Subparagraph 1 -Article 4 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to research tax credit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 + Details
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