Balance Sheet Accounts (Schedule of Available-for-sale Securities) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Jun. 30, 2013
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 164,416	$ 164,363
Fair Value	164,581	164,095
Unrealized Holding Gains	165	126
Unrealized Holding Losses	0	(394)
Cash Equivalents
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	68,154	54,285
Fair Value	68,154	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	96,262	42,994
Fair Value	96,427	43,034
Unrealized Holding Gains	165	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	68,154	54,285
Fair Value	68,154	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	96,262	110,078
Fair Value	96,427	109,810
Unrealized Holding Gains	165	126
Unrealized Holding Losses	$ 0	$ (394)