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Acquisitions, Divestiture and Goodwill (Misfit, Inc. Acquisition) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 22, 2015
Jan. 02, 2016
Dec. 30, 2017
Dec. 31, 2016
Jan. 02, 2016
Business Acquisition [Line Items]          
Cash paid, net of cash acquired     $ 0 $ 0 $ 220,189
Misfit escrow receipts     $ 0 3,341 $ 0
Misfit, Inc.          
Business Acquisition [Line Items]          
Cash paid, net of cash acquired $ 215,400        
Replacement awards attributable to precombination service 1,700        
Amount held in escrow 12,500        
Misfit escrow receipts       $ 3,300  
Liabilities incurred $ 60,000        
Acquisition-related expenses for legal, accounting and valuation services   $ 8,400