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Derivative Financial Instruments - Schedule of Derivative Instruments and Hedging Activities Disclosures (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2026 | Jun. 30, 2025 | Jun. 30, 2026 | Jun. 30, 2025
Derivative Instruments Gain Loss [Line Items] |  |  |  |
Gain (loss) recognized in Other comprehensive income (loss) ("OCI") | $ 4,697 | $ (29,904) | $ 10,853 | $ (19,678)
Foreign Exchange Forward Contract and Options | Not Designated as Hedging Instrument | Location, Statement of Income, Balance [Axis]: us-gaap:NonoperatingIncomeExpense |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |
Net realized and unrealized gain (loss), excluding the underlying foreign currency exposure being hedged | (1,886) | 4,021 | (743) | 3,661
Forward Contracts | Designated as Hedging Instrument | Net Investment Hedging |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |
Gain (loss) recognized in Other comprehensive income (loss) ("OCI") | 6,226 | (39,628) | 14,386 | (26,078)
Gain (loss) reclassified from OCI to earnings | 0 | 0 | 0 | 0
Gain recognized, excluded portion | $ 1,528 | $ 1,743 | $ 5,054 | $ 4,072

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