Income Taxes - Reconciliation of Income Tax Rate (Details)	3 Months Ended		6 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021
Income Tax Disclosure [Abstract]
Income taxes computed at the federal statutory rate	21.00%	21.00%	21.00%	21.00%
State taxes, net of federal benefit	3.10%	3.30%	3.10%	3.20%
Permanent items	0.40%	0.70%	0.30%	0.60%
Net income attributable to noncontrolling interest	(10.10%)	(10.20%)	(10.10%)	(10.10%)
Other	0.00%	0.00%	0.00%	(1.50%)
Total	14.40%	14.80%	14.30%	13.20%