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RESTRUCTURING AND ASSET IMPAIRMENT - Restructuring Costs by Classification on the Consolidated Statements of Income (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Dec. 30, 2017 | Jul. 01, 2017 | Jun. 30, 2018 | Jul. 01, 2017
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Total severance and transition costs | $ 1,856 |  | $ 472 | $ 2,494 | $ 1,549
Cost of services provided and products sold (excluding amortization of intangible assets) |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Total severance and transition costs | 174 |  | 225 | 759 | 1,208
Selling, general and administrative |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Total severance and transition costs | 1,682 |  | 247 | 1,735 | 341
Severance and Transition Costs |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Total severance and transition costs | 1,856 |  | 323 | 2,472 | 1,340
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 | 174 |  | 76 | 737 | 999
Severance and Transition Costs | Selling, general and administrative |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Total severance and transition costs | 1,682 |  | 247 | 1,735 | 341
Asset Impairments and Other Costs |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Total severance and transition costs | 0 |  | 149 | 22 | 209
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 | 0 |  | 149 | 22 | 209
Asset Impairments and Other Costs | Selling, general and administrative |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Total severance and transition costs | 0 |  | $ 0 | 0 | $ 0
RMS |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Total severance and transition costs | 289 | $ 18,100 |  | 1,327 |
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 |  |  | 1,139 |
RMS | Selling, general and administrative |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Total severance and transition costs | 18 |  |  | 188 |
RMS | Severance and Transition Costs |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Total severance and transition costs | 220 |  |  | 743 |
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 |  |  | 555 |
RMS | Severance and Transition Costs | Selling, general and administrative |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Total severance and transition costs | 18 |  |  | 188 |
RMS | Asset Impairments and Other Costs |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Total severance and transition costs | 69 |  |  | 584 |
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 |  |  | 584 |
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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