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Basis of Presentation and Summary of Critical Accounting Policies Principles of Consolidation (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Jan. 27, 2018 | Jan. 28, 2017 | Apr. 29, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |  |
Equity Method Investments | $ 3,303 |  | $ 2,678
Equity in loss of affiliate | 401 | $ 78 |
Cost Method Investments | $ 42 |  | $ 42

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