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RESTRUCTURING AND ASSET IMPAIRMENTS - Restructuring Costs by Reportable Segment (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 24 Months Ended
--- | --- | --- | ---
Jun. 29, 2019 | Jun. 30, 2018 | Jun. 29, 2019 | Jun. 30, 2018 | Dec. 29, 2018
Segment Reporting Information [Line Items] |  |  |  |  |
Restructuring costs | $ 1,685 | $ 1,856 | $ 3,234 | $ 2,494 |
RMS |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Restructuring costs | 641 | 0 | 942 | 0 | $ 20,100
DSA |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Restructuring costs | 672 | 1,197 | 685 | 965 |
Manufacturing |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Restructuring costs | 372 | 0 | 1,607 | 870 |
Unallocated corporate |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Restructuring costs | $ 0 | $ 659 | $ 0 | $ 659 |

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