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Marketable Securities | 9 Months Ended
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Mar. 31, 2012
Marketable Securities [Abstract] |
Marketable Securities |
4. | Marketable Securities
The fair value of the Company's marketable securities was based on quoted market prices or estimates of fair value as of March 31, 2012 and June 30, 2011. The following is a summary of marketable securities, all of which were classified as available-for-sale as of March 31, 2012 and June 30, 2011:
March 31, 2012 |  | Cost |  |  | Unrealized Losses |  |  | Estimated Fair Value |
($ in millions) |  |  |
Non-current |  |  |  |  |  |  |  |  |  |  |  |
Municipal auction rate securities |  | $ | 6.1 |  |  | $ | (1.0 | ) |  | $ | 5.1 |
June 30, 2011 |  | Cost |  |  | Unrealized Losses |  |  | Estimated Fair Value |
($ in millions) |  |  |
Current |  |  |  |  |  |  |  |  |  |  |  |
Government agency bonds |  | $ | 13.7 |  |  | $ | — |  |  | $ | 13.7 |
Corporate bonds |  |  | 15.1 |  |  |  | — |  |  |  | 15.1 |
Commercial paper |  |  | 1.7 |  |  |  | — |  |  |  | 1.7 |
|  | $ | 30.5 |  |  | $ | — |  |  | $ | 30.5 |
Non-current |  |  |  |  |  |  |  |  |  |  |  |
Municipal auction rate securities |  | $ | 6.1 |  |  | $ | (0.8 | ) |  | $ | 5.3 |
For the nine months ended March 31, 2012 and 2011, proceeds from sales and maturities of marketable securities were $30.4 million and $157.1 million, respectively.

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- Definition Tabular disclosure of marketable securities. This may consist of investments in certain debt and equity securities, short-term investments and other assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.4) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6872113&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 2 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26626-111562 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2,12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: 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 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27161-111563 + Details
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