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ACQUISITIONS (TWC Narrative) (Details)
$ in Thousands
12 Months Ended
Oct. 02, 2013
USD ($)
state
branch
Dec. 27, 2013
USD ($)
Dec. 25, 2015
USD ($)
Sep. 25, 2015
USD ($)
Jun. 26, 2015
USD ($)
Dec. 26, 2014
USD ($)
Business Acquisition [Line Items]            
Goodwill     $ 268,495 $ 14,600 $ 10,700 $ 241,855
The Work Connection, Inc. [Member]            
Business Acquisition [Line Items]            
Business Acquisition, Number of Branch Locations Operated by Acquiree | branch 37          
Business Acquisition, Number of States in Which Acquiree Operates | state 9          
Business Combination, Consideration Transferred $ 22,700          
Acquisition-Related and integration Costs Associated with a Business Combination   $ 1,200        
Estimated Fair Value 8,200          
Goodwill $ 7,610