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Business Acquisitions and Divestiture - Brains On-Line Purchase Price Allocation (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 30, 2017
Aug. 04, 2017
Business Acquisition [Line Items]      
Goodwill $ 835,936 $ 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     11,762
Current liabilities     (863)
Deferred revenue     (405)
Long-term liabilities     (2,151)
Total purchase price allocation     $ 20,122