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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. 29, 2018
Dec. 30, 2017
Dec. 31, 2016
Restructuring Cost and Reserve [Line Items]      
Restructuring costs $ 7,568 $ 4,778 $ 17,879
Cost of revenue      
Restructuring Cost and Reserve [Line Items]      
Restructuring costs 950 2,873 14,142
Selling, general and administrative      
Restructuring Cost and Reserve [Line Items]      
Restructuring costs 6,618 1,905 3,737
Severance and Transition Costs      
Restructuring Cost and Reserve [Line Items]      
Restructuring costs 7,520 3,849 8,454
Severance and Transition Costs | Cost of revenue      
Restructuring Cost and Reserve [Line Items]      
Restructuring costs 923 1,944 4,717
Severance and Transition Costs | Selling, general and administrative      
Restructuring Cost and Reserve [Line Items]      
Restructuring costs 6,597 1,905 3,737
Lease Obligations      
Restructuring Cost and Reserve [Line Items]      
Restructuring costs 0 0 4,616
Lease Obligations | Cost of revenue      
Restructuring Cost and Reserve [Line Items]      
Restructuring costs 0 0 4,616
Lease Obligations | Selling, general and administrative      
Restructuring Cost and Reserve [Line Items]      
Restructuring costs 0 0 0
Asset Impairments and Other Costs      
Restructuring Cost and Reserve [Line Items]      
Restructuring costs 48 929 4,809
Asset Impairments and Other Costs | Cost of revenue      
Restructuring Cost and Reserve [Line Items]      
Restructuring costs 27 929 4,809
Asset Impairments and Other Costs | Selling, general and administrative      
Restructuring Cost and Reserve [Line Items]      
Restructuring costs $ 21 $ 0 $ 0