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Available-For-Sale Securities | 12 Months Ended
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Sep. 30, 2023
Investments, Debt and Equity Securities [Abstract] |
Available-For-Sale Securities | Note 6 — Available-For-Sale Securities Available-for-sale securities consist of the following interest-bearing investments:
|  | As of September 30, 2023 |
|  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
Money market funds |  | $ | 308,354 |  |  | $ | — |  |  | $ | — |  |  | $ | 308,354 |
Corporate bonds |  |  | 160,370 |  |  |  | — |  |  |  | 10,060 |  |  |  | 150,310 |
U.S. government treasuries |  |  | 44,782 |  |  |  | — |  |  |  | 3,644 |  |  |  | 41,138 |
Supranational and sovereign debt |  |  | 18,566 |  |  |  | — |  |  |  | 1,774 |  |  |  | 16,792 |
Asset backed obligations |  |  | 7,423 |  |  |  | — |  |  |  | 308 |  |  |  | 7,115 |
Municipal bonds |  |  | 7,513 |  |  |  | — |  |  |  | 417 |  |  |  | 7,096 |
Total(1) |  | $ | 547,008 |  |  | $ | — |  |  | $ | 16,203 |  |  | $ | 530,805 |
(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 consolidated balance sheets. As of September 30, 2023, $222,451 of securities were classified as short-term interest-bearing investments and $308,354 of securities were classified as cash and cash equivalents.
|  | As of September 30, 2022 |
|  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
Money market funds |  | $ | 266,362 |  |  | $ | — |  |  | $ | — |  |  | $ | 266,362 |
Corporate bonds |  |  | 183,266 |  |  |  | — |  |  |  | 14,958 |  |  |  | 168,308 |
U.S. government treasuries |  |  | 44,658 |  |  |  | — |  |  |  | 4,429 |  |  |  | 40,229 |
Municipal bond |  |  | 17,759 |  |  |  | — |  |  |  | 1,634 |  |  |  | 16,125 |
Supranational and sovereign debt |  |  | 11,882 |  |  |  | — |  |  |  | 1,288 |  |  |  | 10,594 |
Asset backed obligations |  |  | 9,835 |  |  |  | — |  |  |  | 488 |  |  |  | 9,347 |
Total(1) |  | $ | 533,762 |  |  | $ | — |  |  | $ | 22,797 |  |  | $ | 510,965 |
(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 consolidated balance sheets. As of September 30, 2022, $244,603 of securities were classified as short-term interest-bearing investments and $266,362 of securities were classified as cash and cash equivalents. As of September 30, 2023, the unrealized losses attributable to the Company’s available-for-sale securities were primarily due to credit spreads and interest rate movements, the securities that have unrealized losses as of September 30, 2023, also had unrealized losses as of September 30, 2022. The Company assessed whether such unrealized losses for the investments in its portfolio were caused by expected credit loss. Based on this assessment, the Company did not recognize any credit losses in the fiscal years ended September 30, 2023 and 2022. Realized gains and losses on short-term interest-bearing investments are included in earnings and are determined based on specific identification method. As of September 30, 2023, the Company’s available-for-sale securities had the following maturity dates:
|  | Market Value |
Due within one year |  | $ | 365,233 |
1 to 2 years |  |  | 85,236 |
2 to 3 years |  |  | 66,964 |
3 to 4 years |  |  | 13,372 |
|  | $ | 530,805 |

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