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Income Taxes (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Mar. 31, 2024 | Mar. 31, 2023 | Sep. 30, 2023
Income Taxes [Line Items] |  |  |  |  |
Statutory rates | 19.10% | 11.80% | 18.60% | 9.50% |
Gross unrecognized tax benefits | $ 12,715 |  | $ 12,715 |  | $ 11,112
Unrecognized tax benefits that, if recognized, would affect the effective tax rate | 8,110 |  | 8,110 |  |
Possible decrease in unrecognized tax benefits liability | $ 2,178 |  | $ 2,178 |  |
Minimum [Member] |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Statutory rates | 19.00% | 19.00% |  |  |
Maximum [Member] |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Statutory rates | 35.00% | 35.00% |  |  |
Domestic Tax Authority [Member] |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Year remaining open to tax examination |  |  | 2020 |  |
State and Local Jurisdiction [Member] |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Year remaining open to tax examination |  |  | 2019 |  |
Foreign Jurisdiction [Member] |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Year remaining open to tax examination |  |  | 2018 |  |

X
- Definition Amount of decrease reasonably possible in the next twelve months for the unrecognized tax benefit. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (d)(3) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-15 + Details
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- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-12 + Details
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- Definition Tax year that remains open to examination under enacted tax laws, in YYYY format. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 15 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-15 + Details
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