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Income Taxes - Federal Rate Reconciliation (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017
Rate reconciliation |  |  |  |  |  |  |  |  |  |  |  |
Tax at federal statutory rate |  |  |  |  |  |  |  |  | $ 48,800 | $ 52,000 | $ 52,400 |
State income tax, net of federal benefit |  |  |  |  |  |  |  |  | 8,400 | 7,000 | (1,300) |
Foreign residual income |  |  |  |  |  |  |  |  | 39,500 | 35,800 | 9,900 |
Nondeductible costs |  |  |  |  |  |  |  |  | 15,800 | 7,600 | 2,500 |
Return to provision |  |  |  |  |  |  |  |  | 3,200 | (3,100) | (700) |
Foreign tax rate differential |  |  |  |  |  |  |  |  | (3,400) | (5,300) | (5,000) |
Income tax credits and incentives |  |  |  |  |  |  |  |  | (47,800) | (44,700) | (28,600) |
Valuation allowance |  |  |  |  |  |  |  |  | (15,900) | (26,500) | 37,800 |
Change in uncertain tax positions |  |  |  |  |  |  |  |  | 5,100 | (200) | (21,200) |
Exclusion of tax on non-controlling interests |  |  |  |  |  |  |  |  | (8,300) | 5,600 | (26,000) |
Tax exempt income |  |  |  |  |  |  |  |  |  | (4,600) | (27,700) |
Audit settlement |  |  |  |  |  |  |  |  | 5,100 | 3,900 | 7,400 |
Impact of changes in tax law |  |  |  |  |  |  |  |  |  | 1,500 | (12,500) |
Other items, net |  |  |  |  |  |  |  |  | 5,500 | (4,700) | (700) |
Income tax expense (benefit) for continuing operations | $ 15,300 | $ (7,200) | $ 21,700 | $ 15,900 | $ 16,600 | $ 27,200 | $ 12,200 | $ (42,500) | $ 45,753 | $ 13,498 | $ (3,494) |
Major elements contributing to the difference between the U.S. federal statutory rate of 21% for fiscal year 2020 and 24.5% for fiscal years ended 2019 and 2018 and the effective tax rate |  |  |  |  |  |  |  |  |  |  |  |
Federal statutory rate (as a percent) |  |  |  |  |  |  |  |  | 21.00% | 21.00% | 24.50% | 35.00%
State income tax, net of federal benefit (as a percent) |  |  |  |  |  |  |  |  | 3.60% | 2.80% | (0.60%) |
Foreign residual income (as a percent) |  |  |  |  |  |  |  |  | 17.00% | 14.50% |  |
Foreign residual income (as a percent) |  |  |  |  |  |  |  |  |  |  | (4.60%) |
Nondeductible costs (as a percent) |  |  |  |  |  |  |  |  | 6.80% | 3.10% | 1.20% |
Change in uncertain tax positions (as a percent) |  |  |  |  |  |  |  |  | 2.20% | (0.10%) | (9.90%) |
Return to provision, primarily foreign tax credits (as a percent) |  |  |  |  |  |  |  |  | 1.40% | (1.30%) | (0.30%) |
Income tax credits and incentive (as a percent) |  |  |  |  |  |  |  |  | (20.60%) | (18.10%) | (13.40%) |
Valuation allowance (as a percent) |  |  |  |  |  |  |  |  | (6.90%) | (10.70%) | 17.70% |
Exclusion of tax on non-controlling interests (as a percent) |  |  |  |  |  |  |  |  | (3.60%) | 2.30% | (12.20%) |
Foreign tax rate differential (as a percent) |  |  |  |  |  |  |  |  | (1.50%) | (2.10%) | (2.30%) |
Audit settlement (as a percent) |  |  |  |  |  |  |  |  | (2.20%) | (1.60%) | (3.50%) |
Tax exempt income (as a percent) |  |  |  |  |  |  |  |  |  | (1.90%) | (13.00%) |
Change in tax rates (as a percent) |  |  |  |  |  |  |  |  |  | (0.60%) | 5.90% |
Other items, net (as a percent) |  |  |  |  |  |  |  |  | 2.50% | (1.90%) | (0.40%) |
Total income tax expense (as a percent) |  |  |  |  |  |  |  |  | 19.70% | 5.40% | (1.70%) |

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- Definition Amount 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 nondeductible expenses. + References Reference 1: 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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- Definition Amount 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 other adjustments. + References Reference 1: 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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- Definition Amount 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 repatriation of foreign earnings. + References Reference 1: 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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- Definition Amount 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 state and local income tax expense (benefit). + References Reference 1: 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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- Definition Amount 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 increase (decrease) in income tax contingencies. Including, but not limited to, domestic tax contingency, foreign tax contingency, state and local tax contingency, and other contingencies. + References Reference 1: 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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- Definition Amount 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 tax credits. Including, but not limited to, research credit, foreign tax credit, investment tax credit, and other tax credits. + References Reference 1: 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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- Definition Amount 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 income (loss) exempt from income taxes. + References Reference 1: 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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