Share-based Compensation (Summary of Stock Option Activity) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	9 Months Ended	12 Months Ended
	Mar. 31, 2018	Jun. 30, 2017
Number of Shares
Options outstanding at June 30, 2017	3,062
Exercised	(779)
Cancelled	(15)
Options outstanding at March 31, 2018	2,268	3,062
Vested and expected to vest at March 31, 2018	2,268
Exercisable at March 31, 2018	1,961
Weighted-Average Exercise Price Per Share
Options outstanding at June 30, 2017	$ 4.06
Exercised	4.56
Cancelled	4.25
Options outstanding at March 31, 2018	3.89	$ 4.06
Vested and expected to vest at March 31, 2018	3.89
Exercisable at March 31, 2018	$ 4.10
Weighted-Average Remaining Contractual Term
Options outstanding	3 years 1 month 9 days	4 years 2 months 8 days
Vested and expected to vest at March 31, 2018	3 years 1 month 9 days
Exercisable at March 31, 2018	2 years 11 months 12 days
Aggregate Intrinsic Value
Options outstanding	$ 16,283	$ 15,868
Vested and expected to vest at March 31, 2018	16,283
Exercisable at March 31, 2018	$ 13,670