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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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