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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

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