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RESTRUCTURING AND ASSET IMPAIRMENTS - Restructuring Costs by Reportable Segment (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 24 Months Ended
--- | --- | --- | ---
Sep. 28, 2019 | Sep. 29, 2018 | Sep. 28, 2019 | Sep. 29, 2018 | Dec. 29, 2018
Segment Reporting Information [Line Items] |  |  |  |  |
Restructuring costs | $ 2,653 | $ 4,675 | $ 5,887 | $ 7,169 |
RMS |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Restructuring costs | 381 | 0 | 1,323 | 0 | $ 20,100
DSA |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Restructuring costs | 1,843 | 56 | 2,529 | 1,021 |
Manufacturing |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Restructuring costs | 429 | 0 | 2,035 | 870 |
Unallocated corporate |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Restructuring costs | $ 0 | $ 4,619 | $ 0 | $ 5,278 |

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