Income Taxes (Effective Tax Rate Reconciliation) (Details)	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Income Tax Disclosure [Abstract]
U.S. federal statutory tax rate	21.00%	21.00%	21.00%
State taxes, net of federal benefit	1.50%	1.00%	0.80%
Income from equity affiliates	(2.40%)	(3.80%)	(3.40%)
Foreign tax differentials	0.30%	0.70%	0.70%
Tax on foreign repatriated earnings	0.00%	0.50%	0.70%
Share-based compensation	(0.10%)	(0.30%)	(0.70%)
Business and asset actions	0.00%	0.70%	0.10%
Other	(0.70%)	(0.70%)	(1.00%)
Effective Tax Rate	19.60%	19.10%	18.20%