Marketable Securities (Details) (U.S. corporate bonds, USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Jun. 30, 2013
Short-term Marketable Securities
Marketable Securities
Fair Value	$ 81,173	$ 57,015
Cost	81,127	57,046
Unrealized Gain	53	8
Unrealized Loss	(7)	(39)
Long-term Marketable Securities
Marketable Securities
Fair Value	17,057	35,353
Cost	17,048	35,402
Unrealized Gain	16	0
Unrealized Loss	$ (7)	$ (49)