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Income Taxes (Effective Tax Rate Reconciliation) (Details)
12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
Income Tax Disclosure [Abstract]      
U.S. federal statutory tax rate 21.00% 21.00% 21.00%
State taxes, net of federal benefit 1.00% 0.80% 0.90%
Income from equity affiliates (3.80%) (3.40%) (2.50%)
Foreign tax differentials 0.70% 0.70% 0.50%
Tax on foreign repatriated earnings 0.50% 0.70% 0.70%
Share-based compensation (0.30%) (0.70%) (0.70%)
Business and asset actions 0.70% 0.10% 0.00%
Other (0.70%) (1.00%) (1.40%)
Effective Tax Rate 19.10% 18.20% 18.50%