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v3.19.1

Nature of Business and Summary of Significant Accounting Policies Revenue Recognition (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Apr. 27, 2019 | Apr. 28, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |
Precontract costs | $ 857 | $ 217
Minimum |  |
Product Warranty Liability [Line Items] |  |
Standard parts warranty period | 1 year |
Installation warranty period | 1 year |
Maximum |  |
Product Warranty Liability [Line Items] |  |
Standard parts warranty period | 5 years |
Installation warranty period | 10 years |

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- Definition Amount, after accumulated amortization and accumulated impairment loss, of asset recognized from cost incurred to obtain or fulfill contract with customer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 340 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=68051541&loc=SL49131252-203054 + Details
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