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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
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Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023
Revenue from Contract with Customer [Abstract] |  |  |  |
Balance, beginning |  | $ 7,738 | $ 5,847 | $ 3,922
Changes in estimates |  | 1,879 | 3,219 | 7,211
Write-offs |  | (347) | (586) | (5,305)
Other | [1] | 455 | (742) | 19
Balance, ending |  | $ 9,725 | $ 7,738 | $ 5,847
[1] | Includes effects of foreign exchange rate changes during the period.

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