Employee Benefit Plan (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Employee Benefit Plan
Company matching contributions equal to each employee's contribution (as a percent)	50.00%
Maximum contribution by the company as a percentage of employee's compensation for the Plan year	4.00%
Contributions to the Plan	$ 2.3	$ 2.1	$ 1.6