Income Taxes (Effective Tax Rate Reconciliation) (Details)	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Income Tax Disclosure [Abstract]
U.S. federal statutory tax rate	21.00%	21.00%	21.00%
State taxes, net of federal benefit	16.10%	1.50%	1.00%
Income from equity affiliates	26.60%	(2.40%)	(3.80%)
Foreign tax differentials	5.60%	0.30%	0.70%
Tax on foreign repatriated earnings	0.00%	0.00%	0.50%
Business and asset actions	(49.00%)	0.00%	0.70%
Other	1.10%	(0.80%)	(1.00%)
Effective Tax Rate	21.40%	19.60%	19.10%