Balance Sheet Accounts (Schedule of Available-for-sale Securities) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Jun. 30, 2013
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 35,266	$ 164,363
Fair Value	35,387	164,095
Unrealized Holding Gains	121	126
Unrealized Holding Losses	0	(394)
Cash equivalents
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	687	54,285
Fair Value	687	54,285
Unrealized Holding Gains	0	0
Unrealized Holding Losses	0	0
Short-term investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	34,579	42,994
Fair Value	34,700	43,034
Unrealized Holding Gains	121	44
Unrealized Holding Losses	0	(4)
Marketable securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		67,084
Fair Value		66,776
Unrealized Holding Gains		82
Unrealized Holding Losses		(390)
Money market funds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	687	54,285
Fair Value	687	54,285
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	34,579	110,078
Fair Value	34,700	109,810
Unrealized Holding Gains	121	126
Unrealized Holding Losses	$ 0	$ (394)