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RESTRUCTURING AND ASSET IMPAIRMENTS - Restructuring Costs by Classification on the Statements of Income (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 28, 2019 | Sep. 29, 2018 | Sep. 28, 2019 | Sep. 29, 2018
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring costs | $ 2,653 | $ 4,675 | $ 5,887 | $ 7,169
Cost of services provided and products sold (excluding amortization of intangible assets) |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring costs | 615 | 35 | 2,759 | 794
Selling, general and administrative |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring costs | 2,038 | 4,640 | 3,128 | 6,375
Severance and Transition Costs |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring costs | 2,473 | 4,649 | 4,184 | 7,121
Severance and Transition Costs | Cost of services provided and products sold (excluding amortization of intangible assets) |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring costs | 435 | 30 | 1,074 | 767
Severance and Transition Costs | Selling, general and administrative |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring costs | 2,038 | 4,619 | 3,110 | 6,354
Asset Impairments and Other Costs |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring costs | 180 | 26 | 1,703 | 48
Asset Impairments and Other Costs | Cost of services provided and products sold (excluding amortization of intangible assets) |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring costs | 180 | 5 | 1,685 | 27
Asset Impairments and Other Costs | Selling, general and administrative |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring costs | $ 0 | $ 21 | $ 18 | $ 21

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