Summary of Significant Accounting Policies (Subscription Acquisition Costs) (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Deferred Costs, Capitalized, Prepaid, and Other Assets [Line Items]
Capitalized direct-response advertising costs	$ 6.0	$ 5.5
Minimum [Member]
Deferred Costs, Capitalized, Prepaid, and Other Assets [Line Items]
Amortization period for subscription acquisition costs	1 year
Maximum [Member]
Deferred Costs, Capitalized, Prepaid, and Other Assets [Line Items]
Amortization period for subscription acquisition costs	2 years