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Nature of Business and Summary of Significant Accounting Policies - Revenue Recognition (Details) - USD ($) $ in Thousands | 12 Months Ended |
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May. 02, 2015 | Apr. 26, 2014 | Apr. 27, 2013
Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |  |
Sales returns, reserve | $ 15 | $ 14 |
Deferred revenue period for recognition of product maintenance contracts | 10 years |  |
Percentage of net sales from services | 8.20% | 8.40% | 9.00%

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- Definition Amount of estimated sales returns. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367646&loc=d3e18780-107790 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 15 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6406750&loc=d3e47468-111626 + Details
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