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Nature of Business and Summary of Significant Accounting Policies Investment in affiliates (Details) - USD ($) $ in Thousands | 12 Months Ended
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May 02, 2020 | Apr. 27, 2019 | Apr. 28, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |  |
Equity Method Investment, Ownership Percentage | 12.18% |  |
Other Commitment | $ 5,000 |  |
Equity Method Investments | 17,257 | $ 3,657 |
Equity in loss of affiliate | 741 | 844 | $ 481
Equity Method Investment, Summarized Financial Information, Current Assets | 10,593 | 192 |
Equity Method Investment, Summarized Financial Information, Noncurrent Assets | 4,266 | 2,626 |
Equity Method Investment, Summarized Financial Information, Current Liabilities | 2,755 | 839 |
Equity Method Investment, Summarized Financial Information, Noncurrent Liabilities | 4,086 | 2,599 |
Equity Method Investment, Summarized Financial Information, Net Income (Loss) | $ (1,383) | $ (2,168) | $ (1,493)

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