RESTRUCTURING AND ASSET IMPAIRMENTS - Severance and Retention Costs By Classification on the Consolidated Statements of Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 25, 2021	Dec. 26, 2020	Dec. 28, 2019
Restructuring Cost and Reserve [Line Items]
Restructuring costs	$ 6,856	$ 12,594	$ 13,839
Cost of services provided and products sold (excluding amortization of intangible assets)
Restructuring Cost and Reserve [Line Items]
Restructuring costs	2,832	5,373	6,715
Selling, general and administrative
Restructuring Cost and Reserve [Line Items]
Restructuring costs	4,024	7,221	7,124
Severance and Transition Costs
Restructuring Cost and Reserve [Line Items]
Restructuring costs	4,717	7,590	11,454
Severance and Transition Costs | Cost of services provided and products sold (excluding amortization of intangible assets)
Restructuring Cost and Reserve [Line Items]
Restructuring costs	1,898	4,453	4,348
Severance and Transition Costs | Selling, general and administrative
Restructuring Cost and Reserve [Line Items]
Restructuring costs	2,819	3,137	7,106
Asset Impairments and Other Costs
Restructuring Cost and Reserve [Line Items]
Restructuring costs	2,139	5,004	2,385
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	934	920	2,367
Asset Impairments and Other Costs | Selling, general and administrative
Restructuring Cost and Reserve [Line Items]
Restructuring costs	$ 1,205	$ 4,084	$ 18