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Fair Value Measurements (Tables) | 6 Months Ended
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Mar. 31, 2023
Fair Value Disclosures [Abstract] |
Schedule of Financial Assets, Temporary Equity, and Liabilities Not Measured at Fair Value in the Consolidated Balance Sheet | The tables below present our estimates of fair value of financial assets and liabilities that were not measured at fair value:
|  | Carrying Value |  | Estimated Fair Value
|  | March 31, 2023 |  | March 31, 2023 |  | Fair Value Measurement Using
(in thousands) |  | Level 1 |  | Level 2 |  | Level 3
Financial assets: |  |  |  |  |  |  |  |  |  |
2.89% promissory note receivable due April 2024 |  | $ | 1,233 |  |  | $ | 1,233 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,233 |
12.00% promissory note receivable from Founders |  | 15,600 |  |  | 15,600 |  |  | — |  |  | — |  |  | 15,600 |
Investments in unconsolidated affiliates |  | 10,681 |  |  | 42,917 |  |  | 42,917 |  |  | — |  |  | — |
Other investments |  | 39,220 |  |  | 39,220 |  |  | — |  |  | — |  |  | 39,220 |
Financial liabilities: |  |  |  |  |  |  |  |  |  |
2024 Convertible Notes |  | $ | 34,184 |  |  | $ | 34,389 |  |  | $ | — |  |  | $ | 34,389 |  |  | $ | — |
2025 Convertible Notes |  | 102,312 |  |  | 94,690 |  |  | — |  |  | 94,690 |  |  | — |
2029 Convertible Notes |  | 222,791 |  |  | 221,529 |  |  | — |  |  | 221,529 |  |  | — |
|  | Carrying Value |  | Estimated Fair Value
|  | March 31, 2022 |  | March 31, 2022 |  | Fair Value Measurement Using
(in thousands) |  | Level 1 |  | Level 2 |  | Level 3
Financial assets: |  |  |  |  |  |  |  |  |  |
2.89% promissory note receivable due April 2024 |  | $ | 1,198 |  |  | $ | 1,198 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,198 |
Investments in unconsolidated affiliates |  | 42,002 |  |  | 51,502 |  |  | 44,529 |  |  | — |  |  | 6,973 |
Other investments |  | 18,000 |  |  | 18,000 |  |  | — |  |  | — |  |  | 18,000 |
Financial liabilities: |  |  |  |  |  |  |  |  |  |
2024 Convertible Notes |  | $ | 142,248 |  |  | $ | 141,594 |  |  | $ | — |  |  | $ | 141,594 |  |  | $ | — |
2025 Convertible Notes |  | 169,920 |  |  | 153,525 |  |  | — |  |  | 153,525 |  |  | — |
|  | Carrying Value |  | Estimated Fair Value
|  | September 30, 2022 |  | September 30, 2022 |  | Fair Value Measurement Using
(in thousands) |  | Level 1 |  | Level 2 |  | Level 3
Financial assets: |  |  |  |  |  |  |  |  |  |
2.89% promissory note receivable due April 2024 |  | $ | 1,215 |  |  | $ | 1,215 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,215 |
Investments in unconsolidated affiliates |  | 37,733 |  |  | 40,279 |  |  | 40,279 |  |  | — |  |  | — |
Other investments |  | 24,220 |  |  | 24,220 |  |  | — |  |  | — |  |  | 24,220 |
Financial liabilities: |  |  |  |  |  |  |  |  |  |
2024 Convertible Notes |  | $ | 142,575 |  |  | $ | 157,727 |  |  | $ | — |  |  | $ | 157,727 |  |  | $ | — |
2025 Convertible Notes |  | 170,328 |  |  | 147,488 |  |  | — |  |  | 147,488 |  |  | — |

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- Definition Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -URI https://asc.fasb.org/extlink&oid=123594938&loc=d3e13467-108611 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + Details
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