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GOODWILL AND INTANGIBLE ASSETS - Narrative Finite Intangibles (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jan. 04, 2016
Sep. 23, 2016
Mar. 25, 2016
Sep. 25, 2015
Sep. 23, 2016
Sep. 25, 2015
Acquired Finite-Lived Intangible Assets [Line Items]            
Amortization of intangible assets   $ 6,300   $ 4,600 $ 19,200 $ 14,300
Trade name/trademarks            
Acquired Finite-Lived Intangible Assets [Line Items]            
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life     3 years      
Aon Hewitt            
Acquired Finite-Lived Intangible Assets [Line Items]            
Intangible Assets $ 35,300          
Aon Hewitt | Customer relationships            
Acquired Finite-Lived Intangible Assets [Line Items]            
Intangible Assets [1] $ 34,900          
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 9 years          
Aon Hewitt | Technologies            
Acquired Finite-Lived Intangible Assets [Line Items]            
Intangible Assets $ 400          
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 3 years          
[1] The preliminary purchase price allocation was adjusted for changes resulting in a net reduction in goodwill of $0.5 million.