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Available-For-Sale Securities | 12 Months Ended
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Sep. 30, 2016
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, 2016 |
|  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
Money market funds |  | $ | 449,288 |  |  | $ | — |  |  | $ | — |  |  | $ | 449,288 |
U.S. government treasuries |  |  | 105,377 |  |  |  | 151 |  |  |  | 15 |  |  |  | 105,513 |
Corporate bonds |  |  | 95,852 |  |  |  | 339 |  |  |  | 37 |  |  |  | 96,154 |
U.S. agency securities |  |  | 48,339 |  |  |  | 69 |  |  |  | 15 |  |  |  | 48,393 |
Commercial paper and certificates of deposit |  |  | 42,498 |  |  |  | — |  |  |  | — |  |  |  | 42,498 |
Asset backed obligations |  |  | 30,121 |  |  |  | 73 |  |  |  | — |  |  |  | 30,194 |
Supranational and sovereign debt |  |  | 8,334 |  |  |  | 8 |  |  |  | — |  |  |  | 8,342 |
Total(1) |  | $ | 779,809 |  |  | $ | 640 |  |  | $ | 67 |  |  | $ | 780,382 |
(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, 2016, $327,063 of securities were classified as short-term interest-bearing investments and $453,319 of securities were classified as cash and cash equivalents.
|  | 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 |
Commercial paper and certificates of deposit |  |  | 27,502 |  |  |  | — |  |  |  | — |  |  |  | 27,502 |
Asset backed obligations |  |  | 29,195 |  |  |  | 20 |  |  |  | — |  |  |  | 29,215 |
Supranational and sovereign debt |  |  | 10,423 |  |  |  | 20 |  |  |  | — |  |  |  | 10,443 |
Total(2) |  | $ | 801,359 |  |  | $ | 456 |  |  | $ | 133 |  |  | $ | 801,682 |
(2) | 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, 2016, 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 did not recognize any credit losses in fiscal years 2016, 2015 and 2014. As of September 30, 2016, the Company’s available-for-sale securities had the following maturity dates:
|  | Market Value |
Due within one year |  | $ | 569,395 |
1 to 2 years |  |  | 105,538 |
2 to 3 years |  |  | 90,240 |
3 to 4 years |  |  | 9,549 |
Thereafter |  |  | 5,660 |
|  | $ | 780,382 |

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