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Income Taxes (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023
Income Taxes [Line Items] |  |  |
Statutory tax rate | 21.00% | 21.00% | 21.00%
Net operating loss deferred tax asset, foreign | $ 2,564 | $ 6,547 |
Tax credits and incentives | 32,171 | 30,886 |
Undistributed foreign earnings not provided for taxes | 327,400 |  |
Unrecognized tax benefits that, if recognized, would affect the effective tax rate | 8,858 | $ 8,003 |
Possible decrease in unrecognized tax benefits liability | 1,076 |  |
Booking of associated cumulative net deferred tax liability | $ 6,040 |  |
Domestic Tax Authority [Member] |  |  |
Income Taxes [Line Items] |  |  |
Year remaining open to tax examination | 2022 |  |
Foreign Jurisdiction [Member] |  |  |
Income Taxes [Line Items] |  |  |
Year remaining open to tax examination | 2018 |  |
State and Local Jurisdiction [Member] |  |  |
Income Taxes [Line Items] |  |  |
Year remaining open to tax examination | 2018 |  |

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- Definition Amount, before allocation of a valuation allowances, of deferred tax assets attributable to deductible tax credit carryforwards including, but not limited to, research, foreign, general business, alternative minimum tax, and other deductible tax credit carryforwards. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-6 + Details
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