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Income Taxes - Unrecognized Tax Benefits - Interest Expense (Details) - USD ($) $ in Thousands | 12 Months Ended |
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Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019
Income Tax Uncertainties [Abstract] |  |  |  |
Unrecognized tax benefits | $ 1,679 | $ 2,006 | $ 16,722 | $ 16,860
Unrecognized tax benefits, tax benefits that if recognized would impact the effective tax rate | 1,679 |  |  |
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense [Abstract] |  |  |  |
Interest related to unrecognized benefits | $ 0 | $ 1,100 | $ 1,100 |

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- Definition Amount of unrecognized tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 10B -URI https://asc.fasb.org/extlink&oid=123427490&loc=SL37586934-109318 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=121826272&loc=SL6600010-109319 + Details
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- Definition Amount of interest expense for an underpayment of 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 15 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=121826272&loc=d3e32718-109319 + Details
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