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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 | 9 Months Ended
--- | --- | ---
Sep. 29, 2018 | Dec. 30, 2017 | Sep. 30, 2017 | Sep. 29, 2018 | Sep. 30, 2017
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Total severance and transition costs | $ 4,675 |  | $ 912 | $ 7,169 | $ 2,461
Cost of services provided and products sold (excluding amortization of intangible assets) |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Total severance and transition costs | 35 |  | 465 | 794 | 1,673
Selling, general and administrative |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Total severance and transition costs | 4,640 |  | 447 | 6,375 | 788
Severance and Transition Costs |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Total severance and transition costs | 4,649 |  | 636 | 7,121 | 1,976
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 | 30 |  | 189 | 767 | 1,188
Severance and Transition Costs | Selling, general and administrative |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Total severance and transition costs | 4,619 |  | 447 | 6,354 | 788
Asset Impairments and Other Costs |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Total severance and transition costs | 26 |  | 276 | 48 | 485
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 | 5 |  | 276 | 27 | 485
Asset Impairments and Other Costs | Selling, general and administrative |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Total severance and transition costs | 21 |  | $ 0 | 21 | $ 0
RMS |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Total severance and transition costs | 303 | $ 18,100 |  | 1,630 |
RMS | Cost of services provided and products sold (excluding amortization of intangible assets) |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Total severance and transition costs | 333 |  |  | 1,472 |
RMS | Selling, general and administrative |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Total severance and transition costs | (30) |  |  | 158 |
RMS | Severance and Transition Costs |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Total severance and transition costs | 65 |  |  | 808 |
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 | 95 |  |  | 650 |
RMS | Severance and Transition Costs | Selling, general and administrative |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Total severance and transition costs | (30) |  |  | 158 |
RMS | Asset Impairments and Other Costs |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Total severance and transition costs | 238 |  |  | 822 |
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 | 238 |  |  | 822 |
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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