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Income Taxes - Reconciliation of U.S. Federal Statutory Tax Rate to Effective Tax Rate (Details) | 12 Months Ended
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Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017
Income Tax Disclosure [Abstract] |  |  |
U.S. federal statutory tax rate | 21.00% | 24.50% | 35.00%
Difference in tax rate due to: |  |  |
Effect of tax rate changes - TJCA | 0.002 | (0.209) | 0
Effect of tax rate changes - International | (0.50%) | (2.10%) | (4.10%)
Noncontrolling interests not subject to tax | (2.70%) | (3.00%) | (4.30%)
State income taxes, net of federal benefit | 3.60% | 2.90% | 2.90%
Valuation allowance adjustments | 0.00% | 1.10% | (1.10%)
Effects of foreign operations | 1.80% | 3.10% | (1.10%)
Excess tax benefits on share-based payments | (1.00%) | (1.10%) | (1.30%)
Other, net | 0.70% | (0.70%) | (0.70%)
Effective tax rate | 23.10% | 3.80% | 25.30%

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