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Fair Value Measurements (Tables) | 6 Months Ended
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Mar. 31, 2025
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, 2025 |  | March 31, 2025 |  | Fair Value Measurement Using
(in thousands) |  | Level 1 |  | Level 2 |  | Level 3
Financial assets: |  |  |  |  |  |  |  |  |  |
Promissory note receivable from Founders |  | $ | 16,921 |  |  | $ | 16,921 |  |  | $ | — |  |  | $ | — |  |  | $ | 16,921 |
Investments in unconsolidated affiliates |  | 13,967 |  |  | 42,199 |  |  | 41,349 |  |  | — |  |  | 850 |
Financial liabilities: |  |  |  |  |  |  |  |  |  |
2025 Convertible Notes |  | $ | 103,325 |  |  | $ | 104,024 |  |  | $ | — |  |  | $ | 104,024 |  |  | $ | — |
2029 Convertible Notes |  | 224,723 |  |  | 338,089 |  |  | — |  |  | 338,089 |  |  | — |
2032 Senior Notes |  | 292,465 |  |  | 305,117 |  |  | — |  |  | 305,117 |  |  | — |
|  | Carrying Value |  | Estimated Fair Value
|  | March 31, 2024 |  | March 31, 2024 |  | Fair Value Measurement Using
(in thousands) |  | Level 1 |  | Level 2 |  | Level 3
Financial assets: |  |  |  |  |  |  |  |  |  |
Promissory note receivable due April 2024 |  | $ | 1,268 |  |  | $ | 1,268 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,268 |
Promissory note receivable from Founders |  | 17,706 |  |  | 17,706 |  |  | — |  |  | — |  |  | 17,706 |
Investments in unconsolidated affiliates |  | 13,162 |  |  | 41,135 |  |  | 40,285 |  |  | — |  |  | 850 |
Financial liabilities: |  |  |  |  |  |  |  |  |  |
2024 Convertible Notes |  | $ | 34,347 |  |  | $ | 34,303 |  |  | $ | — |  |  | $ | 34,303 |  |  | $ | — |
2025 Convertible Notes |  | 102,817 |  |  | 97,171 |  |  | — |  |  | 97,171 |  |  | — |
2029 Convertible Notes |  | 223,756 |  |  | 268,893 |  |  | — |  |  | 268,893 |  |  | — |
|  | Carrying Value |  | Estimated Fair Value
|  | September 30, 2024 |  | September 30, 2024 |  | Fair Value Measurement Using
(in thousands) |  | Level 1 |  | Level 2 |  | Level 3
Financial assets: |  |  |  |  |  |  |  |  |  |
Promissory note receivable from Founders |  | $ | 15,722 |  |  | $ | 15,722 |  |  | $ | — |  |  | $ | — |  |  | $ | 15,722 |
Investments in unconsolidated affiliates |  | 13,329 |  |  | 42,496 |  |  | 41,646 |  |  | — |  |  | 850 |
Financial liabilities: |  |  |  |  |  |  |  |  |  |
2025 Convertible Notes |  | $ | 103,072 |  |  | $ | 100,401 |  |  | $ | — |  |  | $ | 100,401 |  |  | $ | — |
2029 Convertible Notes |  | 224,256 |  |  | 273,700 |  |  | — |  |  | 273,700 |  |  | — |

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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 -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-11 + Details
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- References No definition available. + Details
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