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Available-For-Sale Securities | 12 Months Ended
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Sep. 30, 2015
Investments, Debt and Equity Securities [Abstract] |
Available-For-Sale Securities | Note 5 — Available-For-Sale Securities Available-for-sale securities consist of the following interest-bearing investments:
|  | As of September 30, 2015 |
|  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
Money market funds |  | $ | 470,286 |  |  | $ | — |  |  | $ | — |  |  | $ | 470,286 |
U.S. government treasuries |  |  | 117,235 |  |  |  | 217 |  |  |  | — |  |  |  | 117,452 |
Corporate bonds |  |  | 101,613 |  |  |  | 123 |  |  |  | 133 |  |  |  | 101,603 |
U.S. agency securities |  |  | 45,105 |  |  |  | 76 |  |  |  | — |  |  |  | 45,181 |
Asset backed obligations |  |  | 29,195 |  |  |  | 20 |  |  |  | — |  |  |  | 29,215 |
Commercial paper and certificates of deposit |  |  | 27,502 |  |  |  | — |  |  |  | — |  |  |  | 27,502 |
Supranational and sovereign debt |  |  | 10,423 |  |  |  | 20 |  |  |  | — |  |  |  | 10,443 |
Total(1) |  | $ | 801,359 |  |  | $ | 456 |  |  | $ | 133 |  |  | $ | 801,682 |
(1) | Available-for-sale securities with maturities longer than 90 days from the date of acquisition were classified as short term interest-bearing investments and available-for-sale securities with maturities of 90 days or less from the date of acquisition were included in cash and cash equivalents on the Company’s balance sheet. As of September 30, 2015, $318,439 of securities were classified as short term interest-bearing investments and $483,243 of securities were classified as cash and cash equivalents.
|  | As of September 30, 2014 |
|  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
Money market funds |  | $ | 649,745 |  |  | $ | — |  |  | $ | — |  |  | $ | 649,745 |
U.S. government treasuries |  |  | 118,652 |  |  |  | 88 |  |  |  | 32 |  |  |  | 118,708 |
Corporate bonds |  |  | 102,387 |  |  |  | 152 |  |  |  | 119 |  |  |  | 102,420 |
U.S. agency securities |  |  | 41,658 |  |  |  | — |  |  |  | 9 |  |  |  | 41,649 |
Asset backed obligations |  |  | 29,160 |  |  |  | — |  |  |  | 65 |  |  |  | 29,095 |
Commercial paper and certificates of deposit |  |  | 28,509 |  |  |  | — |  |  |  | — |  |  |  | 28,509 |
Supranational and sovereign debt |  |  | 5,804 |  |  |  | — |  |  |  | 5 |  |  |  | 5,799 |
Government-guaranteed debt |  |  | 1,185 |  |  |  | 2 |  |  |  | — |  |  |  | 1,187 |
Mortgages |  |  | 569 |  |  |  | — |  |  |  | 42 |  |  |  | 527 |
Total(2) |  | $ | 977,669 |  |  | $ | 242 |  |  | $ | 272 |  |  | $ | 977,639 |
(2) | As of September 30, 2014, $321,196 of securities were classified as short term interest-bearing investments and $656,443 of securities were classified as cash and cash equivalents.
As of September 30, 2015, the unrealized losses attributable to the Company’s available-for-sale securities were primarily due to credit spreads and interest rate movements. The Company assessed whether such unrealized losses for the investments in its portfolio were other-than-temporary. Based on this assessment, the Company recognized immaterial credit losses in fiscal 2015, 2014 and 2013. As of September 30, 2015, the Company’s available-for-sale securities had the following maturity dates:
|  | Market Value |
Due within one year |  | $ | 596,762 |
1 to 2 years |  |  | 118,196 |
2 to 3 years |  |  | 67,140 |
3 to 4 years |  |  | 13,209 |
Thereafter |  |  | 6,375 |
|  | $ | 801,682 |

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