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RESTRUCTURING AND ASSET IMPAIRMENTS - Restructuring Costs by Classification on the Statements of Income (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 27, 2020 | Jun. 29, 2019 | Jun. 27, 2020 | Jun. 29, 2019
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring costs | $ 8,351 | $ 1,685 | $ 8,909 | $ 3,234
Cost of services provided and products sold (excluding amortization of intangible assets) |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring costs | 3,329 | 727 | 3,804 | 2,143
Selling, general and administrative |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring costs | 5,022 | 958 | 5,105 | 1,091
Severance and Transition Costs |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring costs | 5,388 | 1,311 | 5,717 | 1,711
Severance and Transition Costs | Cost of services provided and products sold (excluding amortization of intangible assets) |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring costs | 3,299 | 371 | 3,545 | 638
Severance and Transition Costs | Selling, general and administrative |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring costs | 2,089 | 940 | 2,172 | 1,073
Asset Impairments and Other Costs |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring costs | 2,963 | 374 | 3,192 | 1,523
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 | 30 | 356 | 259 | 1,505
Asset Impairments and Other Costs | Selling, general and administrative |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring costs | $ 2,933 | $ 18 | $ 2,933 | $ 18

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