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Available-For-Sale Securities (Tables) | 12 Months Ended
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Sep. 30, 2021
Investments, Debt and Equity Securities [Abstract] |
Interest-Bearing Investments in Available-for-Sale Securities | Available-for-sale securities consist of the following interest-bearing investments:
|  | As of September 30, 2021 |
|  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
Money market funds |  | $ | 209,026 |  |  | $ | — |  |  | $ | — |  |  | $ | 209,026 |
Corporate bonds |  |  | 191,445 |  |  |  | 76 |  |  |  | 1,084 |  |  |  | 190,437 |
U.S. government treasuries |  |  | 54,987 |  |  |  | 4 |  |  |  | 239 |  |  |  | 54,752 |
Supranational and sovereign debt |  |  | 7,479 |  |  |  | — |  |  |  | 26 |  |  |  | 7,453 |
Asset backed obligations |  |  | 3,890 |  |  |  | — |  |  |  | 5 |  |  |  | 3,885 |
Total(1) |  | $ | 466,827 |  |  | $ | 80 |  |  | $ | 1,354 |  |  | $ | 465,553 |
(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, 2021, $256,527 of securities were classified as short-term interest-bearing investments and $209,026 of securities were classified as cash and cash equivalents.
|  | As of September 30, 2020 |
|  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
Money market funds |  | $ | 558,633 |  |  | $ | — |  |  | $ | — |  |  | $ | 558,633 |
Corporate bonds |  |  | 754 |  |  |  | — |  |  |  | 2 |  |  |  | 752 |
Total(1) |  | $ | 559,387 |  |  | $ | — |  |  | $ | 2 |  |  | $ | 559,385 |
(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, 2020, $752 of securities were classified as short-term interest-bearing investments and $558,633 of securities were classified as cash and cash equivalents.
Available-for-Sale Securities Debt Maturities Market Value | As of September 30, 2021, the Company’s available-for-sale securities had the following maturity dates:
|  | Market Value |
Due within one year |  | $ | 226,990 |
1 to 2 years |  |  | 19,080 |
2 to 3 years |  |  | 58,270 |
3 to 4 years |  |  | 94,188 |
Thereafter |  |  | 67,025 |
|  | $ | 465,553 |

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- Definition Tabular disclosure of maturities of an entity's investments as well as any other information pertinent to the investments. + References No definition available. + Details
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- Definition Tabular disclosure of the reconciliation of available-for-sale securities from cost basis to fair value. + References No definition available. + Details
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