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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. 25, 2021 | Sep. 26, 2020 | Sep. 25, 2021 | Sep. 26, 2020
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring costs | $ 2,331 | $ 1,580 | $ 4,690 | $ 10,489
Cost of services provided and products sold (excluding amortization of intangible assets) |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring costs | 633 | 906 | 1,589 | 4,710
Selling, general and administrative |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring costs | 1,698 | 674 | 3,101 | 5,779
Severance and Transition Costs |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring costs | 1,370 | 818 | 3,396 | 6,536
Severance and Transition Costs | Cost of services provided and products sold (excluding amortization of intangible assets) |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring costs | 518 | 606 | 1,434 | 4,152
Severance and Transition Costs | Selling, general and administrative |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring costs | 852 | 212 | 1,962 | 2,384
Asset Impairments and Other Costs |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring costs | 961 | 762 | 1,294 | 3,953
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 | 115 | 300 | 155 | 558
Asset Impairments and Other Costs | Selling, general and administrative |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring costs | $ 846 | $ 462 | $ 1,139 | $ 3,395

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