Income Taxes - Reconciliation of Income Taxes (Details)	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Income Tax Disclosure [Abstract]
Income taxes computed at the federal statutory rate	21.00%	21.00%	21.00%
State taxes, net of federal benefit	3.60%	3.40%	3.00%
Permanent items	1.20%	1.10%	0.50%
Uncertain tax position reserve, net of federal benefit	0.30%	1.90%	0.00%
Net income attributable to noncontrolling interest	(9.50%)	(9.80%)	(9.90%)
Total	16.60%	17.60%	14.60%