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Company's Derivatives on Consolidated Financial Statements of Operations (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Foreign Currency Forward Contracts | Other Income (Expense) |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Amount of (Loss) Gain Recognized in Income | $ (142) | $ 601 | $ 497 | $ 1,176

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