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Income Taxes (Effective Tax Rate Reconciliation) (Details)
12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2015
Income Tax Disclosure [Abstract]      
U.S. federal statutory tax rate 35.00% 35.00% 35.00%
State taxes, net of federal benefit 1.00% 1.20% 1.10%
Income from equity affiliates (2.00%) (3.30%) (4.00%)
Foreign tax differentials (7.90%) (6.60%) (5.90%)
U.S. taxes on foreign earnings (2.20%) (3.10%) (2.10%)
Domestic production activities (0.80%) (0.80%) (1.00%)
Non-deductible goodwill impairment charge 3.60% 0.00% 0.00%
Non-U.S. subsidiary tax election (7.70%) 0.00% 0.00%
Business separation costs 0.20% 4.20% 0.20%
Share-based compensation (1.20%) (0.00%) (0.00%)
Other 0.40% 1.20% 0.40%
Effective Tax Rate 18.40% 27.80% 23.70%