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Acquisitions - Purchase of an Asset Group Constituting a Business - CCM Business (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jul. 31, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Jun. 30, 2016
Business Acquisition [Line Items]            
Goodwill   $ 2,597,685   $ 2,597,685   $ 2,325,586
Acquisition-related costs   3,892 $ 983 10,666 $ 1,160  
CCM Business            
Business Acquisition [Line Items]            
Purchase consideration $ 315,000          
Amount held back and unpaid 2,800          
Current assets 683          
Non-current deferred tax asset 6,916          
Non-current tangible assets 2,348          
Liabilities assumed (38,091)          
Total identifiable net assets 136,856          
Goodwill 178,144          
Net assets acquired 315,000          
Goodwill expected to be tax deductible 147,400          
CCM Business | Special Charges            
Business Acquisition [Line Items]            
Acquisition-related costs   $ 100   $ 800    
CCM Business | Customer assets            
Business Acquisition [Line Items]            
Acquired intangible assets 64,000          
CCM Business | Technology assets            
Business Acquisition [Line Items]            
Acquired intangible assets $ 101,000