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Sale of Non-Digital Division (Details) - USD ($) $ in Thousands | 12 Months Ended
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Apr. 28, 2018 | Apr. 29, 2017 | Apr. 30, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Impairment of intangible assets | $ 0 | $ 830 | $ 0
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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