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Fair Value Measurements (Tables) | 12 Months Ended
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Sep. 30, 2025
Fair Value Disclosures [Abstract] |
Schedule of Financial Assets and Liabilities Not Measured at Fair Value in the Consolidated Balance Sheet | The tables below present our financial assets and liabilities that were not measured at fair value:
|  | Carrying Value |  | Estimated Fair Value
|  | September 30, 2025 |  | September 30, 2025 |  | Fair Value Measurement Using
(in thousands) |  | Level 1 |  | Level 2 |  | Level 3
Financial assets: |  |  |  |  |  |  |  |  |  |
Promissory note receivable from Founders |  | $ | 24,369 |  |  | $ | 24,369 |  |  | $ | — |  |  | $ | — |  |  | $ | 24,369 |
Investments in unconsolidated affiliates |  | 18,123 |  |  | 59,729 |  |  | 58,573 |  |  | — |  |  | 1,156 |
Financial liabilities: |  |  |  |  |  |  |  |  |  |
2029 Convertible Notes |  | $ | 225,258 |  |  | $ | 422,931 |  |  | $ | — |  |  | $ | 422,931 |  |  | $ | — |
2032 Senior Notes |  | 292,818 |  |  | 320,734 |  |  | — |  |  | 320,734 |  |  | — |
|  | 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 affiliate |  | 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://www.xbrl.org/2003/role/exampleRef -Name Accounting Standards Codification -Section 55 -Paragraph 10 -SubTopic 10 -Topic 825 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482881/825-10-55-10 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-13 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482881/825-10-55-12 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-12 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 11 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-11 + Details
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