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Derivative Financial Instruments - Additional Information (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019
Derivative [Line Items] |  |  |
Net losses on foreign currency exposures | $ 8,000 | $ 1,700 | $ 3,200
Net realized and unrealized gain or (loss) (excluding the underlying foreign currency exposure being hedged) | (4,900) | 7,000 | (8,400)
Designated as Hedging Instrument |  |  |
Derivative [Line Items] |  |  |
Gain (loss) recognized in OCI—effective portion |  |  | 200
Gain (loss) reclassified from OCI into income—effective portion |  |  | 600
Forward Contracts | Designated as Hedging Instrument | Net Investment Hedging |  |  |
Derivative [Line Items] |  |  |
Gain (loss) recognized in OCI—effective portion | $ 695 | $ (5,483) | $ (2,925)
Derivative, remaining maturity | 3 months |  |

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- Definition Period remaining until the derivative contract matures, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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