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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