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Sale of Non-Digital Division Assets (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Apr. 27, 2019 | Apr. 28, 2018 | Apr. 29, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Impairment of intangible assets | $ 0 | $ 0 | $ 830
Non-Digital Division [Member] |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Assets sold |  | 517 |
Gain from sale of non-digital division |  | $ 1,267 |

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