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Income Taxes (Unrecognized Tax Benefits, Additional Information) (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022
Income Tax Contingency [Line Items] |  |  |  |
Unrecognized tax benefits that would impact effective tax rate | $ 4,100 |  |  |
Unrecognized tax benefits | 4,312 | $ 3,602 | $ 3,162 | $ 3,316
Unrecognized Tax Benefits, Interest on Income Taxes Expense |  | 100 |  |
Unrecognized Tax Benefits, Income Tax Penalties Accrued | 0 | 0 |  |
Unrecognized Tax Benefits, Income Tax Penalties Expense | 100 | $ 100 |  |
Noncurrent income taxes payable |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Unrecognized tax benefits | 3,000 |  |  |
Noncurrent deferred tax assets |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Unrecognized tax benefits | 1,300 |  |  |
Maximum |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Decrease in unrecognized tax benefits that is reasonably possible | $ 100 |  |  |

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- Definition Amount of unrecognized tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 217 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482663/740-10-55-217 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 15A -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-15A Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 10B -Publisher FASB -URI https://asc.fasb.org/1943274/2147482525/740-10-45-10B + 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 -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 15 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-15 + Details
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