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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, 2020 | Sep. 30, 2019 | Sep. 30, 2018
Operating Loss Carryforwards [Line Items] |  |  |
U.S. federal statutory tax rate | 21.00% | 21.00% | 24.50%
Difference in tax rate due to: |  |  |
Noncontrolling interests not subject to tax | 0.00% | (2.70%) | (3.00%)
State income taxes, net of federal benefit | 2.80% | 3.60% | 2.90%
Valuation allowance adjustments | 0.00% | 0.00% | 1.10%
Effects of foreign operations | 1.30% | 1.80% | 3.10%
Excess tax benefits on share-based payments | (0.20%) | (1.00%) | (1.10%)
Other, net | (0.30%) | 0.70% | (0.70%)
Effective tax rate | 20.20% | 23.10% | 3.80%
Effect of U.S. tax legislation |  |  |
Difference in tax rate due to: |  |  |
Effect of tax rate change | (4.70%) | 0.20% | (20.90%)
Effect of tax rate change | (4.70%) | 0.20% | (20.90%)
Effect of tax rate changes - International |  |  |
Difference in tax rate due to: |  |  |
Effect of tax rate change | 0.30% | (0.50%) | (2.10%)
Effect of tax rate change | 0.30% | (0.50%) | (2.10%)

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- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 6.I.Fact.4) -URI http://asc.fasb.org/extlink&oid=116825942&loc=d3e330036-122817 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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- Definition Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to changes in the valuation allowance for deferred tax assets. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 6.I.Fact.4) -URI http://asc.fasb.org/extlink&oid=116825942&loc=d3e330036-122817 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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