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Marketable Securities (Tables) | 12 Months Ended
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Sep. 30, 2012
Marketable Securities [Abstract] |
Schedule of Marketable Securities | At September 30, 2012 our marketable securities were (in thousands):
| Amortized Cost (1) |  | Unrealized Gains |  | Unrealized Losses (2) |  | Fair Value (1)
Current marketable securities: |  |  |  |  |  |  |
Corporate bonds | $ | 39,306 |  |  | $ | 14 |  |  | $ | (19 | ) |  | $ | 39,301 |
Commercial paper | 2,000 |  |  | — |  |  | — |  |  | 2,000 |
Certificates of deposit | 7,262 |  |  | — |  |  | (4 | ) |  | 7,258 |
Government municipal bonds | 9,814 |  |  | 1 |  |  | (2 | ) |  | 9,813 |
Current marketable securities | 58,382 |  |  | 15 |  |  | (25 | ) |  | 58,372 |
Non-current marketable securities: |  |  |  |  |  |  |
Corporate bonds | 2,019 |  |  | — |  |  | (3 | ) |  | 2,016 |
Total marketable securities | $ | 60,401 |  |  | $ | 15 |  |  | $ | (28 | ) |  | $ | 60,388 |
(1) | Included in amortized cost and fair value is purchased and accrued interest of $485.
(2) | The aggregate fair value of securities with unrealized losses as of September 30, 2012 was $34,503. These investments have been in an unrealized loss position for less than twelve months.
At September 30, 2011 our marketable securities were (in thousands):
| Amortized Cost (1) |  | Unrealized Gains |  | Unrealized Losses (2) |  | Fair Value (1)
Current marketable securities: |  |  |  |  |  |  |
Corporate bonds | $ | 22,694 |  |  | $ | 18 |  |  | $ | (144 | ) |  | $ | 22,568 |
Commercial paper | 4,998 |  |  | — |  |  | (3 | ) |  | 4,995 |
Certificates of deposit | 8,775 |  |  | — |  |  | (9 | ) |  | 8,766 |
Government municipal bonds | 15,200 |  |  | 3 |  |  | (8 | ) |  | 15,195 |
Current marketable securities | 51,667 |  |  | 21 |  |  | (164 | ) |  | 51,524 |
Non-current marketable securities: |  |  |  |  |  |  |
Corporate bonds | 1,613 |  |  | — |  |  | (10 | ) |  | 1,603 |
Total marketable securities | $ | 53,280 |  |  | $ | 21 |  |  | $ | (174 | ) |  | $ | 53,127 |
(1) | Included in amortized cost and fair value is purchased and accrued interest of $478.
(2) | The aggregate fair value of securities with unrealized losses as of September 30, 2011 was $43,755. These investments have been in an unrealized loss position for less than twelve months.

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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 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27232-111563 Reference 2: 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 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 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27161-111563 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 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.4) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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