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Fair Value of Financial Instruments - Measured at Fair Value (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022
--- | --- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Earnout liability | $ 14,547 | $ 0 | $ 0
Recurring basis |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Due from related parties related to share based payment awards | 14,339 | 10,695 |
Equity method investment in SEVN | 23,520 | 18,651 |
Employer compensation liability related to share based payment awards | 14,339 | 10,695 |
Earnout liability | 11,958 |  |
Recurring basis | Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Due from related parties related to share based payment awards | 14,339 | 10,695 |
Equity method investment in SEVN | 23,520 | 18,651 |
Employer compensation liability related to share based payment awards | 14,339 | 10,695 |
Earnout liability | 0 |  |
Recurring basis | Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Due from related parties related to share based payment awards | 0 | 0 |
Equity method investment in SEVN | 0 | 0 |
Employer compensation liability related to share based payment awards | 0 | 0 |
Earnout liability | 0 |  |
Recurring basis | Level 3 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Due from related parties related to share based payment awards | 0 | 0 |
Equity method investment in SEVN | 0 | 0 |
Employer compensation liability related to share based payment awards | 0 | $ 0 |
Earnout liability | $ 11,958 |  |

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