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Acquisitions, Divestiture and Goodwill (Divestiture) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 30, 2016
Dec. 30, 2017
Dec. 31, 2016
Jan. 02, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Business divestiture   $ 1,750 $ 3,500 $ 0
Misfit escrow receipts   0 $ 3,341 $ 0
Misfit, Inc.        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Business divestiture $ 3,500      
Amount held in escrow $ 3,500      
Misfit escrow receipts   $ 1,800    
Escrow period after closing of divestiture 2 years