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Acquisitions - Purchase of an Asset Group Consituting a Business - CEM Business (Details) - USD ($)
$ in Thousands
 3 Months Ended
Apr. 30, 2016
Sep. 30, 2016
Jun. 30, 2016
Business Acquisition [Line Items]      
Goodwill   $ 2,595,614 $ 2,325,586
Adjustment relating to acquisition   (273)  
CEM Business      
Business Acquisition [Line Items]      
Purchase consideration $ 160,000    
Amount held back and unpaid 7,300    
Current assets 3,078    
Non-current tangible assets 12,589    
Liabilities assumed (26,106)    
Total identifiable net assets 69,561    
Goodwill 90,439    
Net assets acquired 160,000    
Goodwill expected to be tax deductible 77,000    
Adjustment relating to acquisition   $ 300  
Customer Assets | CEM Business      
Business Acquisition [Line Items]      
Acquired intangible assets 33,000    
Technology Assets | CEM Business      
Business Acquisition [Line Items]      
Acquired intangible assets $ 47,000