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RESTRUCTURING AND ASSET IMPAIRMENTS - Additional Information (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 28, 2019 | Dec. 29, 2018 | Dec. 30, 2017 | Dec. 31, 2016
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring costs | $ 13,839 | $ 7,568 | $ 4,778 |
Severance and retention costs liability | 6,406 | 2,921 | 6,856 | $ 8,102
Asset Impairments and Other Costs |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring costs | 2,385 | 48 | 929 |
Severance and Transition Costs |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring costs | 11,454 | 7,520 | 3,849 |
Severance and Transition Costs | Accrued Compensation |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Severance and retention costs liability | 6,300 | 2,400 |  |
Severance and Transition Costs | Other Long-Term Liabilities |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Severance and retention costs liability | 100 | 500 |  |
Cost of revenue |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring costs | 6,715 | 950 | 2,873 |
Cost of revenue | Asset Impairments and Other Costs |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring costs | 2,367 | 27 | 929 |
Cost of revenue | Severance and Transition Costs |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring costs | $ 4,348 | 923 | 1,944 |
2017 RMS Restructuring | RMS |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring costs |  | 1,983 | 18,145 |
2017 RMS Restructuring | Asset Impairments and Other Costs | RMS |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring costs |  | 822 | 17,716 |
2017 RMS Restructuring | Severance and Transition Costs | RMS |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring costs |  | 1,161 | 429 |
2017 RMS Restructuring | Cost of revenue | RMS |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring costs |  | 1,669 | 18,078 |
2017 RMS Restructuring | Cost of revenue | Asset Impairments and Other Costs | RMS |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring costs |  | 822 | 17,716 |
2017 RMS Restructuring | Cost of revenue | Severance and Transition Costs | RMS |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring costs |  | $ 847 | $ 362 |

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