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Acquisitions - Acquisition of Hightail, Inc. (Details) - USD ($)
Feb. 14, 2018
Dec. 31, 2018
Jun. 30, 2018
Business Acquisition [Line Items]      
Goodwill   $ 3,732,669,000 $ 3,580,129,000
Hightail, Inc      
Business Acquisition [Line Items]      
Purchase consideration $ 20,500,000    
Goodwill 7,293,000    
Goodwill expected to be tax deductible 0    
Deferred revenue 5,200,000    
Deferred revenue adjustment 2,000,000.0    
Acquired receivables, fair value 700,000    
Acquired receivables, gross contractual amount 800,000    
Acquired receivables, estimated uncollectible $ 100,000