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Derivative Financial Instruments - Schedule of Notional Amounts of Outstanding Forward Contracts (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Sep. 30, 2020
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Euro / U.S. Dollar | Foreign Exchange Forward | Designated as Hedging Instrument | Net Investment Hedging |  |
Derivative [Line Items] |  |
Notional amount | $ 188,981 | $ 164,885

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