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Income Taxes (Unrecognized Tax Benefits, Additional Information) (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019
Income Tax Contingency [Line Items] |  |  |  |
Unrecognized tax benefits that would impact effective tax rate | $ 3,300 |  |  |
Unrecognized tax benefits | 3,316 | $ 2,908 | $ 2,600 | $ 1,713
Unrecognized Tax Benefits, Interest on Income Taxes Expense | 100 | 100 |  |
Unrecognized Tax Benefits, Income Tax Penalties Accrued | 0 | $ 0 |  |
Noncurrent income taxes payable |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Unrecognized tax benefits | 2,400 |  |  |
Noncurrent deferred tax assets |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Unrecognized tax benefits | 900 |  |  |
Maximum |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Decrease in unrecognized tax benefits that is reasonably possible | $ 300 |  |  |

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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 http://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 http://asc.fasb.org/extlink&oid=121826272&loc=SL6600010-109319 + Details
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- Definition Amount of statutory penalties accrued for a tax position claimed or expected to be claimed by the entity, in its tax return. + 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 http://asc.fasb.org/extlink&oid=121826272&loc=d3e32718-109319 + Details
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