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Revenue (Schedule of Uncollectible Amounts And Change in Expected Allowance for Credit Losses for Trade Accounts Receivable and Unbilled Receivables) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022
Revenue from Contract with Customer [Abstract] |  |  |  |
Balance, beginning |  | $ 5,847 | $ 3,922 | $ 3,664
Changes in estimates |  | 3,219 | 7,211 | 447
Write-offs |  | (586) | (5,305) | (46)
Other | [1] | (742) | 19 | (143)
Balance, ending |  | $ 7,738 | $ 5,847 | $ 3,922
[1] | Includes effects of foreign exchange rate changes during the period.

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