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Acquisitions and Goodwill (Misfit, Inc. Acquisition) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 22, 2015
Jan. 02, 2016
Jan. 03, 2015
Dec. 28, 2013
Mar. 09, 2015
Business Acquisition [Line Items]          
Cash paid, net of cash acquired   $ 220,189 $ 0 $ 15,521  
Business Combination, Consideration Transferred [Abstract]          
Cash paid, net of cash acquired   220,189 0 15,521  
Goodwill   $ 359,394 $ 197,728 $ 206,954  
Trade name          
Business Combination, Consideration Transferred [Abstract]          
Useful Lives   6 years      
Developed technology          
Business Combination, Consideration Transferred [Abstract]          
Useful Lives   7 years      
Revolving line of credit          
Business Acquisition [Line Items]          
Maximum borrowing capacity         $ 1,050,000
Misfit, Inc.          
Business Acquisition [Line Items]          
Cash paid, net of cash acquired $ 215,370        
Replacement awards attributable to precombination service 1,709        
Liabilities incurred 60,000        
Acquisition-related expenses for legal, accounting and valuation services   $ 8,400      
Business Combination, Consideration Transferred [Abstract]          
Cash paid, net of cash acquired 215,370        
Replacement awards attributable to precombination service 1,709        
Total transaction consideration 217,079        
Accounts receivable 1,208        
Inventories 12,900        
Prepaid expenses and other current assets 25        
Property, plant and equipment and other long-term assets 1,190        
Goodwill 164,405        
Current liabilities (12,964)        
Long-term liabilities (12,985)        
Total net assets acquired 217,079        
Misfit, Inc. | Trade name          
Business Combination, Consideration Transferred [Abstract]          
Intangible assets $ 15,700        
Useful Lives 6 years        
Misfit, Inc. | Customer lists          
Business Combination, Consideration Transferred [Abstract]          
Intangible assets $ 10,800        
Useful Lives 5 years        
Misfit, Inc. | Developed technology          
Business Combination, Consideration Transferred [Abstract]          
Intangible assets $ 36,100        
Useful Lives 7 years        
Misfit, Inc. | Noncompete agreement          
Business Combination, Consideration Transferred [Abstract]          
Intangible assets $ 700        
Useful Lives 3 years