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ACQUISITIONS AND GOODWILL (Misfit, Inc. Acquisition) (Details) - USD ($)
$ in Thousands
 9 Months Ended
Dec. 22, 2015
Oct. 01, 2016
Oct. 03, 2015
Jan. 02, 2016
Business Acquisition [Line Items]        
Cash paid, net of cash acquired   $ 0 $ 4,820  
Goodwill   $ 364,647   $ 359,394
Trade name        
Business Acquisition [Line Items]        
Useful Lives   6 years    
Developed technology        
Business Acquisition [Line Items]        
Useful Lives   7 years    
Misfit Inc.        
Business Acquisition [Line Items]        
Cash paid, net of cash acquired $ 215,370      
Replacement awards attributable to precombination service 1,709      
Working capital and other adjustments (3,788)      
Total transaction consideration 213,291      
Inventories 7,011      
Prepaid expenses and other current assets 25      
Property, plant and equipment and other long-term assets 1,190      
Goodwill 168,021      
Current liabilities (17,019)      
Long-term liabilities (9,237)      
Total net assets acquired 213,291      
Misfit Inc. | Trade name        
Business Acquisition [Line Items]        
Intangible assets $ 15,700      
Useful Lives 6 years      
Misfit Inc. | Customer lists        
Business Acquisition [Line Items]        
Intangible assets $ 10,800      
Useful Lives 5 years      
Misfit Inc. | Developed technology        
Business Acquisition [Line Items]        
Intangible assets $ 36,100      
Useful Lives 7 years      
Misfit Inc. | Noncompete agreement        
Business Acquisition [Line Items]        
Intangible assets $ 700      
Useful Lives 3 years