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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
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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)

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- Definition Amount of accumulated pre-tax unrealized gains before deducting pre-tax unrealized losses on investments in available-for-sale securities impacting investments. + References No definition available. + Details
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- Definition Amount of accumulated pre-tax unrealized loss before deducting pre-tax unrealized gain on investments in available-for-sale securities impacting investments. + References No definition available. + Details
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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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