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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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Apr. 29, 2017 | Apr. 30, 2016 | May 02, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |  |
Sales returns, reserve | $ 42 | $ 93 |
Deferred revenue period for recognition of product maintenance contracts | 10 years |  |
Percentage of net sales from services | 10.50% | 9.70% | 8.20%

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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=68058157&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=68051624&loc=d3e47468-111626 + Details
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