Summary of Significant Accounting Policies - Goodwill and Purchased Intangible Assets and Advertising Expenses (Details) $ in Millions	12 Months Ended
	Jun. 30, 2016 USD ($) item	Jun. 30, 2015 USD ($)	Jun. 30, 2014 USD ($)
Goodwill and Purchased Intangible Assets
Number of operating segments | item	1
Number of reporting units | item	1
Impairment of goodwill | $	$ 0.0	$ 0.0	$ 0.0
Advertising Expenses
Advertising expenses | $	$ 0.3	$ 0.5	$ 0.6
Minimum
Goodwill and Purchased Intangible Assets
Estimated useful lives of purchased intangible assets	1 year
Maximum
Goodwill and Purchased Intangible Assets
Estimated useful lives of purchased intangible assets	6 years