Accounting Policies and Recent Accounting Pronouncements - Property and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Property, Plant and Equipment [Line Items]
Impairment charges for long-lived assets	$ 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
Leasehold improvements
Property, Plant and Equipment [Line Items]
Useful life	5 years
Building
Property, Plant and Equipment [Line Items]
Useful life	40 years
Minimum | Computer software
Property, Plant and Equipment [Line Items]
Useful life	3 years
Minimum | Capitalized software development costs
Property, Plant and Equipment [Line Items]
Useful life	3 years
Maximum | Computer hardware
Property, Plant and Equipment [Line Items]
Useful life	7 years
Maximum | Capitalized software development costs
Property, Plant and Equipment [Line Items]
Useful life	5 years