Marketable Securities (Details) (U.S. corporate bonds, USD $) In Thousands, unless otherwise specified	9 Months Ended	12 Months Ended
	Mar. 31, 2015	Jun. 30, 2014
Short-term Marketable Securities
Marketable Securities
Fair Value	$ 71,848	$ 67,619
Cost	71,863	67,587
Unrealized Gain	13	39
Unrealized Loss	(28)	(7)
Long-term Marketable Securities
Marketable Securities
Fair Value	9,140	31,270
Cost	9,152	31,290
Unrealized Gain	2	1
Unrealized Loss	$ (14)	$ (21)