Basis of Presentation and Summary of Significant Accounting Policies (Schedule of Available-for-sale Securities) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Jun. 30, 2012
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 164,363	$ 135,002
Fair Value	164,095	135,060
Unrealized Holding Gains	126	151
Unrealized Holding Losses	(394)	(93)
Money Market Funds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	54,285	36,141
Fair Value	54,285	36,141
Unrealized Holding Gains	0	0
Unrealized Holding Losses	0	0
U.S. Corporate Debt Securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	110,078	84,882
Fair Value	109,810	84,949
Unrealized Holding Gains	126	148
Unrealized Holding Losses	(394)	(81)
U.S. Government Agency Securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		11,241
Fair Value		11,234
Unrealized Holding Gains		3
Unrealized Holding Losses		(10)
U.S. Municipal Bonds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		2,738
Fair Value		2,736
Unrealized Holding Gains		0
Unrealized Holding Losses		(2)
Cash Equivalents
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	54,285	36,141
Fair Value	54,285	36,141
Unrealized Holding Gains	0	0
Unrealized Holding Losses	0	0
Short-term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	42,994	23,311
Fair Value	43,034	23,358
Unrealized Holding Gains	44	48
Unrealized Holding Losses	(4)	(1)
Marketable Securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	67,084	75,550
Fair Value	66,776	75,561
Unrealized Holding Gains	82	103
Unrealized Holding Losses	$ (390)	$ (92)