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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 | 9 Months Ended
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Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Revenue from Contract with Customer [Abstract] |  |  |  |  |
Balance, beginning |  | $ 7,126 | $ 9,949 | $ 5,847 | $ 3,922
Changes in estimates |  | 835 | 77 | 2,531 | 6,463
Write-offs |  | (13) | (1,271) | (488) | (1,601)
Other | [1] | (987) | (55) | (929) | (84)
Balance, ending |  | $ 6,961 | $ 8,700 | $ 6,961 | $ 8,700
[1] | Includes effects of foreign exchange rate changes during the period.

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