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Divestiture and Acquisition (Spin-off of Nuvectra Corporation) (Details) $ in Thousands |  | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Mar. 14, 2016 | Apr. 01, 2016 USD ($) | Dec. 30, 2016 USD ($) | Dec. 28, 2018 USD ($) | Dec. 29, 2017 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Assets divested in Spin-off, net of cash |  |  | $ 130,800 |  |
Liabilities divested in Spin-off |  |  | 2,100 |  |
Liabilities transferred |  |  |  |  |
Current liabilities |  |  |  | $ 0 | $ 47,703
Spinoff [Member] | Nuvectra [Member] |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Stock conversion ratio | 3 |  |  |  |
Cash capital contribution |  | $ 75,000 |  |  |
Liabilities transferred |  |  |  |  |
Pre-tax loss |  |  | $ 5,200 |  |

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