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RESTRUCTURING AND ASSET IMPAIRMENT - Restructuring Costs by Reportable Segment (Details) - USD ($) $ in Thousands | 3 Months Ended | 24 Months Ended
--- | --- | ---
Mar. 30, 2019 | Mar. 31, 2018 | Dec. 29, 2018
Segment Reporting Information [Line Items] |  |  |
Restructuring costs | $ 1,549 | $ 638 |
RMS |  |  |
Segment Reporting Information [Line Items] |  |  |
Restructuring costs | 301 | 0 | $ 20,100
DSA |  |  |
Segment Reporting Information [Line Items] |  |  |
Restructuring costs | 13 | (232) |
Manufacturing |  |  |
Segment Reporting Information [Line Items] |  |  |
Restructuring costs | $ 1,235 | $ 870 |

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