Income Taxes - Summary of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Sep. 30, 2024
Deferred tax assets:
Investment in partnerships	$ 51,030	$ 24,496
Tax receivable agreement	9,265	10,071
Net operating loss	8,130	1,216
Other	4,162	1,495
Total	72,587	37,278
Valuation allowance	0	0
Total deferred tax assets	72,587	37,278
Deferred tax liabilities:
Fixed assets	0	0
Intangibles	0	0
Other	0	0
Total deferred tax liabilities	0	0
Deferred tax assets, net	$ 72,587	$ 37,278