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RESTRUCTURING AND ASSET IMPAIRMENTS - Restructuring Costs by Reportable Segment (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 26, 2021 | Jun. 27, 2020 | Jun. 26, 2021 | Jun. 27, 2020
Segment Reporting Information [Line Items] |  |  |  |
Restructuring costs | $ 1,609 | $ 8,351 | $ 2,358 | $ 8,909
Unallocated corporate |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Restructuring costs | 0 | 0 | (151) | 0
RMS |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Restructuring costs | 0 | 769 | 7 | 759
DSA |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Restructuring costs | 1,074 | 6,186 | 1,633 | 6,498
Manufacturing |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Restructuring costs | $ 535 | $ 1,396 | $ 869 | $ 1,652

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