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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, 2022 | Sep. 30, 2021 | Sep. 30, 2020
Revenue From Contract With Customer [Abstract] |  |  |  |
Balance, beginning |  | $ 3,664 | $ 8,359 | $ 8,936
Charged to costs and expenses, or sales allowance |  | 1,866 | 2,382 | 4,735
Deductions |  | (1,587) | (7,255) | (5,342)
Other (deductions)/additions | [1] | (21) | 178 | 30
Balance, ending |  | $ 3,922 | $ 3,664 | $ 8,359
[1] | Includes effects of foreign exchange rate changes during the period.

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- Definition Amount of increase (decrease) in allowance for credit loss on financing receivable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 + Details
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