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Income Taxes - Effective Income Tax (Details) - USD ($) $ in Thousands | 12 Months Ended
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Apr. 30, 2016 | May 02, 2015 | Apr. 26, 2014
Income Tax Disclosure [Abstract] |  |  |
Computed income tax expense at federal, state and local jurisdiction statutory rates | $ 1,063 | $ 11,089 | $ 13,035
State taxes, net of federal benefit | 40 | 1,016 | 1,433
Research and development tax credit | (2,015) | (1,292) | (750)
Meals and entertainment | 334 | 369 | 344
Stock compensation | 525 | 566 | 586
Dividends paid to retirement plan | (323) | (352) | (328)
Domestic production activities deduction | (91) | (529) | (1,012)
Change in valuation allowances | 1,265 | (2,295) | 2,301
Change in uncertain tax positions | 125 | 2,357 | 111
Other, net | 142 | (128) | (685)
Income tax expense | $ 1,065 | $ 10,801 | $ 15,035

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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 deduction for dividend paid to employee stock ownership plan. + References Reference 1: 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=65882285&loc=d3e32698-109319 Reference 2: 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=65882285&loc=d3e32687-109319 + Details
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