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RESTRUCTURING AND ASSET IMPAIRMENTS - Restructuring Costs by Related to RMS Restructuring Initiative (Details) - USD ($) | 3 Months Ended | 6 Months Ended | 24 Months Ended
--- | --- | --- | ---
Jun. 29, 2019 | Jun. 30, 2018 | Jun. 29, 2019 | Jun. 30, 2018 | Dec. 29, 2018
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Total severance and transition costs | $ 1,685,000 | $ 1,856,000 | $ 3,234,000 | $ 2,494,000 |
Cost of services provided and products sold (excluding amortization of intangible assets) |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Total severance and transition costs | 727,000 | 174,000 | 2,143,000 | 759,000 |
Selling, general and administrative |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Total severance and transition costs | 958,000 | 1,682,000 | 1,091,000 | 1,735,000 |
Severance and Transition Costs |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Total severance and transition costs | 1,311,000 | 1,856,000 | 1,711,000 | 2,472,000 |
Severance and Transition Costs | Cost of services provided and products sold (excluding amortization of intangible assets) |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Total severance and transition costs | 371,000 | 174,000 | 638,000 | 737,000 |
Severance and Transition Costs | Selling, general and administrative |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Total severance and transition costs | 940,000 | 1,682,000 | 1,073,000 | 1,735,000 |
Asset Impairments and Other Costs |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Total severance and transition costs | 374,000 | 0 | 1,523,000 | 22,000 |
Asset Impairments and Other Costs | Cost of services provided and products sold (excluding amortization of intangible assets) |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Total severance and transition costs | 356,000 | 0 | 1,505,000 | 22,000 |
Asset Impairments and Other Costs | Selling, general and administrative |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Total severance and transition costs | 18,000 | 0 | 18,000 | 0 |
RMS |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Total severance and transition costs | 641,000 | 0 | 942,000 | 0 | $ 20,100,000
RMS | Severance and Transition Costs |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Total severance and transition costs |  |  |  |  | $ 1,200,000
2017 RMS Restructuring | RMS |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Total severance and transition costs | $ 0 | 289,000 | $ 0 | 1,327,000 |
2017 RMS Restructuring | RMS | Cost of services provided and products sold (excluding amortization of intangible assets) |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Total severance and transition costs |  | 271,000 |  | 1,139,000 |
2017 RMS Restructuring | RMS | Selling, general and administrative |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Total severance and transition costs |  | 18,000 |  | 188,000 |
2017 RMS Restructuring | RMS | Severance and Transition Costs |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Total severance and transition costs |  | 220,000 |  | 743,000 |
2017 RMS Restructuring | RMS | Severance and Transition Costs | Cost of services provided and products sold (excluding amortization of intangible assets) |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Total severance and transition costs |  | 202,000 |  | 555,000 |
2017 RMS Restructuring | RMS | Severance and Transition Costs | Selling, general and administrative |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Total severance and transition costs |  | 18,000 |  | 188,000 |
2017 RMS Restructuring | RMS | Asset Impairments and Other Costs |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Total severance and transition costs |  | 69,000 |  | 584,000 |
2017 RMS Restructuring | RMS | Asset Impairments and Other Costs | Cost of services provided and products sold (excluding amortization of intangible assets) |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Total severance and transition costs |  | 69,000 |  | 584,000 |
2017 RMS Restructuring | RMS | Asset Impairments and Other Costs | Selling, general and administrative |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Total severance and transition costs |  | $ 0 |  | $ 0 |

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