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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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