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Accounting Policies and Recent Accounting Pronouncements - Property and Equipment (Details) - USD ($)
$ in Thousands
12 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2015
Property, Plant and Equipment [Line Items]      
Tangible Asset Impairment Charges $ 0 $ 0 $ 0
Furniture and fixtures      
Property, Plant and Equipment [Line Items]      
Useful life 5 years    
Office equipment      
Property, Plant and Equipment [Line Items]      
Useful life 5 years    
Computer hardware      
Property, Plant and Equipment [Line Items]      
Useful life 3 years    
Computer software      
Property, Plant and Equipment [Line Items]      
Useful life 3 years    
Leasehold improvements      
Property, Plant and Equipment [Line Items]      
Useful life 5 years    
Building      
Property, Plant and Equipment [Line Items]      
Useful life 40 years    
Minimum | Capitalized software development costs      
Property, Plant and Equipment [Line Items]      
Useful life 5 years    
Maximum | Capitalized software development costs      
Property, Plant and Equipment [Line Items]      
Useful life 7 years