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RESTRUCTURING AND ASSET IMPAIRMENT - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 29, 2018 | Dec. 30, 2017 | Sep. 30, 2017 | Sep. 29, 2018 | Sep. 30, 2017 | Jun. 30, 2018 | Jul. 01, 2017 | Dec. 31, 2016
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring costs | $ 4,675 |  | $ 912 | $ 7,169 | $ 2,461 |  |  |
Severance and retention costs liability | 7,062 | $ 6,856 | 7,170 | 7,062 | 7,170 | $ 6,810 | $ 7,010 | $ 8,102
Accrued Compensation |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Severance and retention costs liability | 2,600 |  | 2,900 | 2,600 | 2,900 |  |  |
RMS |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring costs | 303 | 18,100 |  | 1,630 |  |  |  |
RMS | Maximum |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Expected restructuring costs (not expected to exceed) | 1,000 |  |  | 1,000 |  |  |  |
Cash portion of expected amount (up to) |  |  |  | 2,500 |  |  |  |
Asset Impairments and Accelerated Depreciation | RMS |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring costs |  | $ 17,700 |  |  |  |  |  |
Severance and Transition Costs |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring costs | 4,649 |  | 636 | 7,121 | 1,976 |  |  |
Severance and Transition Costs | Other Noncurrent Liabilities |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Severance and retention costs liability | 4,400 |  | $ 4,300 | 4,400 | $ 4,300 |  |  |
Severance and Transition Costs | RMS |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring costs | $ 65 |  |  | $ 808 |  |  |  |

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