Income Taxes (Effective Tax Rate Reconciliation) (Details)	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Income Tax Disclosure [Abstract]
U.S. federal statutory tax rate	21.00%	21.00%	21.00%
State taxes, net of federal benefit	0.80%	0.90%	0.60%
Income from equity affiliates	(3.40%)	(2.50%)	(2.30%)
Foreign tax differentials	0.70%	0.50%	0.10%
Tax on foreign repatriated earnings	0.70%	0.70%	0.90%
Share-based compensation	(0.70%)	(0.70%)	(0.80%)
Other	(0.90%)	(1.40%)	0.20%
Effective Tax Rate	18.20%	18.50%	19.70%