Income Taxes - Summary of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Sep. 30, 2022
Deferred tax assets:
Investment in partnerships	$ 23,619	$ 0
Tax receivable agreement	10,702	11,609
Net operating loss	1,557	0
Other	0	3
Total	35,878	11,612
Valuation allowance	0	0
Total deferred tax assets	35,878	11,612
Deferred tax liabilities:
Investment in partnerships	0	2,410
Fixed assets	107	66
Intangibles	703	703
Other	2	0
Total deferred tax liabilities	812	3,179
Deferred tax assets, net	$ 35,066	$ 8,433