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BUSINESS ACQUISITIONS AND DIVESTITURE - Brains On-Line Purchase Price Allocation (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Apr. 03, 2018
Dec. 30, 2017
Aug. 04, 2017
Business Acquisition [Line Items]        
Trade receivables, contractual amount   $ 35,073    
Goodwill $ 1,254,444   $ 804,906  
Brains On-Line        
Business Acquisition [Line Items]        
Trade 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       12,582
Current liabilities       (1,683)
Deferred revenue       (405)
Other long-term liabilities       (2,151)
Total purchase price allocation       $ 20,122