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Operations and Summary of Significant Accounting Policies (Narrative) (Details) - USD ($) | 12 Months Ended
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Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022
Organization Consolidation And Presentation Of Financial Statements [Abstract] |  |  |
Selling, general, and administrative expenses include net foreign currency transaction gain (loss) | $ 8,369,000 | $ (1,020,000) | $ 1,450,000
Additional asset impairment charges | 0 | 0 | 0
Additional asset impairment charges, intangible assets | 0 | 0 | $ 0
Increase in cash provided by operating activities as result of factoring activities | $ 1,398,000 | $ 26,273,000 |

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