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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. 31, 2016
Dec. 26, 2015
Dec. 27, 2014
Restructuring Cost and Reserve [Line Items]      
Total severance and retention costs $ 8,454 $ 6,173 $ 7,792
Cost of revenue (excluding amortization of intangible assets)      
Restructuring Cost and Reserve [Line Items]      
Total severance and retention costs 4,717 735 3,342
Selling, general and administrative      
Restructuring Cost and Reserve [Line Items]      
Total severance and retention costs $ 3,737 $ 5,438 $ 4,450