Net Loss Per Share (Schedule of Earnings Per Share, Basic and Diluted) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Earnings Per Share Basic And Diluted [Abstract]
Net loss	$ (46,792)	$ (1,744)	$ (36,363)
Weighted-average shares used in per share calculation - basic and diluted	114,221	108,273	103,074
Net loss per share - basic and diluted	$ (0.41)	$ (0.02)	$ (0.35)