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BUSINESS ACQUISITIONS AND DIVESTITURE - Brains On-Line, Purchase Price Allocation (Details) - USD ($)
$ in Thousands
Dec. 30, 2017
Aug. 04, 2017
Dec. 31, 2016
Dec. 26, 2015
Business Acquisition [Line Items]        
Goodwill $ 804,906   $ 787,517 $ 438,829
Brains On-Line        
Business Acquisition [Line Items]        
Acquired receivables, contractual amount   $ 1,146    
Trade receivables   1,146    
Other current assets (excluding cash)   640    
Property, plant and equipment   664    
Other long-term assets   29    
Definite-lived intangible assets   9,300    
Goodwill   11,762    
Current liabilities   (863)    
Deferred revenue   (405)    
Long-term liabilities   (2,151)    
Total purchase price allocation   $ 20,122