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Acquisitions - Acquisition of Hightail, Inc. (Details) - USD ($)
3 Months Ended 9 Months Ended
Feb. 14, 2018
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2018
Mar. 31, 2017
Jun. 30, 2017
Business Acquisition [Line Items]            
Goodwill   $ 3,592,598,000   $ 3,592,598,000   $ 3,416,749,000
Acquisition-related costs   1,172,000 $ 4,639,000 4,625,000 $ 15,305,000  
Hightail, Inc            
Business Acquisition [Line Items]            
Purchase consideration $ 20,500,000          
Goodwill 7,127,000          
Goodwill expected to be tax deductible 0          
Deferred revenue 5,200,000          
Deferred revenue adjustment 2,000,000          
Acquired receivables, fair value 700,000          
Acquired receivables, gross contractual amount 800,000          
Acquired receivables, estimated uncollectible $ 100,000          
Acquisition-related costs   $ 500,000   $ 500,000