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Operations and Summary of Significant Accounting Policies (Narrative) (Details) - USD ($) | 12 Months Ended
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Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019
Organization Consolidation And Presentation Of Financial Statements [Abstract] |  |  |
Selling, general, and administrative expenses include net foreign currency transaction gain (loss) | $ (1,986,000) | $ 194,000 | $ (1,018,000)
Additional asset impairment charges | 0 |  |
Additional asset impairment charges, intangible assets | $ 0 |  |

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