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RESTRUCTURING AND ASSET IMPAIRMENT - Schedule of Other Restructuring Initiatives (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 29, 2018
Sep. 30, 2017
Sep. 29, 2018
Sep. 30, 2017
Restructuring Cost and Reserve [Line Items]        
Restructuring costs $ 4,675 $ 912 $ 7,169 $ 2,461
Cost of revenue        
Restructuring Cost and Reserve [Line Items]        
Restructuring costs 35 465 794 1,673
Selling, general and administrative        
Restructuring Cost and Reserve [Line Items]        
Restructuring costs 4,640 447 6,375 788
Severance and Transition Costs        
Restructuring Cost and Reserve [Line Items]        
Restructuring costs 4,649 636 7,121 1,976
Severance and Transition Costs | Cost of revenue        
Restructuring Cost and Reserve [Line Items]        
Restructuring costs 30 189 767 1,188
Severance and Transition Costs | Selling, general and administrative        
Restructuring Cost and Reserve [Line Items]        
Restructuring costs 4,619 447 6,354 788
Asset Impairments and Other Costs        
Restructuring Cost and Reserve [Line Items]        
Restructuring costs 26 276 48 485
Asset Impairments and Other Costs | Cost of revenue        
Restructuring Cost and Reserve [Line Items]        
Restructuring costs 5 276 27 485
Asset Impairments and Other Costs | Selling, general and administrative        
Restructuring Cost and Reserve [Line Items]        
Restructuring costs $ 21 $ 0 $ 21 $ 0