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Derivative Financial Instruments - Schedule of Offsetting Assets (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Sep. 30, 2020
--- | --- | ---
Derivative [Line Items] |  |
Net Amounts of Assets Presented in the Consolidated Balance Sheets | $ 1,119 | $ 903
Foreign Currency Forwards |  |
Derivative [Line Items] |  |
Gross Amount of Recognized Assets | 906 |
Gross Amounts Offset in the Consolidated Balance Sheets | 0 |
Net Amounts of Assets Presented in the Consolidated Balance Sheets | 906 |
Gross Amounts Not Offset in the Consolidated Balance Sheets, Financial Instruments | (906) |
Gross Amounts Not Offset in the Consolidated Balance Sheets, Cash Collateral Received | 0 |
Net Amount | $ 0 |

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