Summary of Significant Accounting Policies (Schedule of Goodwill) (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Goodwill [Roll Forward]
Balance at beginning of period	$ 70,877	$ 0
Addition due to acquisition of Enterasys (Note 2)	0	70,877
Balance at end of period	$ 70,877	$ 70,877