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Income Taxes (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2020
Income Taxes [Line Items] |  |  |  |
Statutory tax rate | 21.00% | 21.00% | 21.00% |
Net operating loss deferred tax asset, foreign | $ 6,547 | $ 3,748 |  |
Tax credits and incentives | 30,886 | 28,319 |  |
Undistributed foreign earnings not provided for taxes | 361,600 |  |  |
Unrecognized tax benefits that, if recognized, would affect the effective tax rate | 8,003 | $ 6,963 |  |
Possible decrease in unrecognized tax benefits liability | 1,909 |  |  |
Booking of associated net deferred tax liability | $ 6,100 |  |  |
Domestic Tax Authority [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Year remaining open to tax examination |  |  |  | 2021
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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