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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, 2018 | Sep. 30, 2017 | Sep. 30, 2016
Income Tax Disclosure [Abstract] |  |  |
U.S. federal statutory tax rate | 24.50% | 35.00% | 35.00%
Difference in tax rate due to: |  |  |
Effect of tax rate changes - TJCA | (20.90%) | 0.00% | 0.00%
Effect of tax rate changes - France | (2.10%) | (4.10%) | 0.00%
Noncontrolling interests not subject to tax | (3.00%) | (4.30%) | (6.20%)
State income taxes, net of federal benefit | 2.90% | 2.90% | 3.00%
Valuation allowance adjustments | 1.10% | (1.10%) | (0.90%)
Effects of foreign operations | 3.10% | (1.10%) | 0.60%
Excess tax benefits on share-based payments | (1.10%) | (1.30%) | 0.00%
Other, net | (0.70%) | (0.70%) | (0.30%)
Effective tax rate | 3.80% | 25.30% | 31.20%

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