Balance Sheet Accounts (Schedule of Available-for-sale Securities) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Jun. 30, 2012
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 165,544	$ 135,002
Fair Value	165,686	135,060
Unrealized Holding Gains	246	151
Unrealized Holding Losses	(104)	(93)
Cash Equivalents
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	54,179	36,141
Fair Value	54,179	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	42,255	23,311
Fair Value	42,336	23,358
Unrealized Holding Gains	81	48
Unrealized Holding Losses	0	(1)
Marketable Securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	69,110	75,550
Fair Value	69,171	75,561
Unrealized Holding Gains	165	103
Unrealized Holding Losses	(104)	(92)
Money Market Funds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	54,179	36,141
Fair Value	54,179	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	105,853	84,882
Fair Value	105,994	84,949
Unrealized Holding Gains	245	148
Unrealized Holding Losses	(104)	(81)
U.S. Government Agency Securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	5,512	11,241
Fair Value	5,513	11,234
Unrealized Holding Gains	1	3
Unrealized Holding Losses	0	(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)

This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale.

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- Definition

This item represents the gross unrealized gains for securities, at a point in time, which are categorized neither as held-to-maturity nor trading securities.

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