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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 | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2026 | Mar. 31, 2025 | Mar. 31, 2026 | Mar. 31, 2025
Revenue from Contract with Customer [Abstract] |  |  |  |  |
Balance, beginning |  | $ 13,426 | $ 7,793 | $ 9,725 | $ 7,738
Changes in estimates |  | (179) | 599 | 3,450 | 806
Write-offs |  |  | (120) | (78) | (120)
Other | [1] | (140) | 286 | 10 | 134
Balance, ending |  | $ 13,107 | $ 8,558 | $ 13,107 | $ 8,558
[1] | Includes effects of foreign exchange rate changes during the period.

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