Income Taxes - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024
Operating Loss Carryforwards [Line Items]
Deferred tax assets, operating loss carryforwards	$ 8,130	$ 1,216
Tax receivable agreement liability	$ 37,500	40,600
Percentage of net cash savings	85.00%
Tax Credit Carryforward, Amount	$ 9,700	3,700
Deferred Tax Assets, Operating Loss Carryforwards, Domestic	6,700	900
Domestic Tax Jurisdiction
Operating Loss Carryforwards [Line Items]
Federal net operating loss carryforwards	32,000	4,300
Deferred Tax Asset, Interest Carryforward	2,400	900
State and Local Jurisdiction
Operating Loss Carryforwards [Line Items]
Federal net operating loss carryforwards	1,400	$ 300
Deferred Tax Asset, Interest Carryforward	$ 200