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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. 28, 2018 | Apr. 29, 2017 | Apr. 30, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |  |
Sales returns, reserve | $ 39 | $ 42 |
Percentage of net sales from long-term construction-type contracts | 60.80% | 58.10% | 59.70%
Percentage of net sales from equipment contracts | 31.10% | 34.00% | 33.00%
Deferred revenue period for recognition of product maintenance contracts | 10 years |  |
Deferred Revenue | $ 20,127 | $ 17,571 |
Percentage of net sales from services | 8.00% | 7.80% | 7.30%

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- Definition The percentage of net equipment contract revenue to total net revenue from the sale of equipment contracts as of year end. + References No definition available. + Details
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- Definition The percentage of net long-term construction-type contract revenue to total net revenue from the sale of long-term construction-type contracts as of year end. + References No definition available. + Details
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- Definition The percentage of net service revenue to total net revenue from the sale of services as of year end. + References No definition available. + Details
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- Definition Amount of deferred revenue as of balance sheet date. Deferred revenue represents collections of cash or other assets related to a revenue producing activity for which revenue has not yet been recognized. Generally, an entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 13.A.3) -URI http://asc.fasb.org/extlink&oid=65893310&loc=d3e214044-122780 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 13.A.4(a).Q1) -URI http://asc.fasb.org/extlink&oid=65893310&loc=d3e214044-122780 + Details
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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=84158767&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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