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Available-For-Sale Securities | 12 Months Ended
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Sep. 30, 2021
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, 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.
As of September 30, 2021, the immaterial 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 caused by expected credit loss. Based on this assessment, the Company did not recognize any credit losses in the fiscal years ended September 30, 2021 and 2020. 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, 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 The entire disclosure for investments in certain debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2209399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2324412 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2176304 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1403 -Paragraph (b) + Details
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