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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. 28, 2019
Dec. 29, 2018
Dec. 30, 2017
Restructuring Cost and Reserve [Line Items]      
Restructuring costs $ 13,839 $ 7,568 $ 4,778
Cost of services provided and products sold (excluding amortization of intangible assets)      
Restructuring Cost and Reserve [Line Items]      
Restructuring costs 6,715 950 2,873
Selling, general and administrative      
Restructuring Cost and Reserve [Line Items]      
Restructuring costs 7,124 6,618 1,905
Severance and Transition Costs      
Restructuring Cost and Reserve [Line Items]      
Restructuring costs 11,454 7,520 3,849
Severance and Transition Costs | Cost of services provided and products sold (excluding amortization of intangible assets)      
Restructuring Cost and Reserve [Line Items]      
Restructuring costs 4,348 923 1,944
Severance and Transition Costs | Selling, general and administrative      
Restructuring Cost and Reserve [Line Items]      
Restructuring costs 7,106 6,597 1,905
Asset Impairments and Other Costs      
Restructuring Cost and Reserve [Line Items]      
Restructuring costs 2,385 48 929
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 2,367 27 929
Asset Impairments and Other Costs | Selling, general and administrative      
Restructuring Cost and Reserve [Line Items]      
Restructuring costs $ 18 $ 21 $ 0