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Derivative Financial Instruments - Gains Losses on Derivative Financial Instruments Recorded in Consolidated Statements of Income (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
Foreign Currency Forward Contracts |  |  |
Derivative [Line Items] |  |  |
Gain (loss) on foreign currency forward contracts | $ (1,625) | $ 2,748 | $ (2,064)

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- Definition Aggregate net gain (loss) on all derivative instruments recognized in earnings during the period, before tax effects. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480434/815-10-50-4A + Details
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