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ACQUISITIONS (MDT Narrative) (Details)
$ in Thousands
 12 Months Ended
Feb. 04, 2013
USD ($)
state
branch
Dec. 25, 2015
USD ($)
Dec. 26, 2014
USD ($)
Dec. 27, 2013
USD ($)
Sep. 25, 2015
USD ($)
Jun. 26, 2015
USD ($)
Business Acquisition [Line Items]            
Payments to Acquire Businesses, Net of Cash Acquired   $ 67,500 $ 305,876 $ 77,560    
Goodwill   $ 268,495 $ 241,855   $ 14,600 $ 10,700
MDT Personnel, LLC [Member]            
Business Acquisition [Line Items]            
Payments to Acquire Businesses, Net of Cash Acquired $ 53,100          
Estimated Fair Value 10,200          
Goodwill $ 25,686          
Business Acquisition, Number of Branch Locations Operated by Acquiree | branch 105          
Business Acquisition, Number of States in Which Acquiree Operates | state 25          
Acquisition-Related and integration Costs Associated with a Business Combination       $ 6,000