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RESTRUCTURING AND ASSET IMPAIRMENTS - Severance and Retention Costs By Classification on the Consolidated Statements of Income (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 26, 2020 | Dec. 28, 2019 | Dec. 29, 2018
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring costs | $ 12,594 | $ 13,839 | $ 9,551
Cost of services provided and products sold (excluding amortization of intangible assets) |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring costs | 5,373 | 6,715 | 2,619
Selling, general and administrative |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring costs | 7,221 | 7,124 | 6,932
Severance and Transition Costs |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring costs | 7,590 | 11,454 | 8,681
Severance and Transition Costs | Cost of services provided and products sold (excluding amortization of intangible assets) |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring costs | 4,453 | 4,348 | 1,770
Severance and Transition Costs | Selling, general and administrative |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring costs | 3,137 | 7,106 | 6,911
Asset Impairments and Other Costs |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring costs | 5,004 | 2,385 | 870
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 | 920 | 2,367 | 849
Asset Impairments and Other Costs | Selling, general and administrative |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring costs | $ 4,084 | $ 18 | $ 21

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