Income Taxes - Schedule of Components of Income Tax Expense (Benefit) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Income Tax Disclosure [Abstract]
Current federal	$ 6,019	$ 8,377	$ 0
Current state	3,299	5,101	1,896
Deferred federal	(13,202)	6,317	18,997
Deferred state	(854)	(885)	3,065
Total (benefit) expense from income taxes	$ (4,738)	$ 18,910	$ 23,958