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Derivative Financial Instruments - Schedule of Derivative Instruments and Hedging Activities Disclosures (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2026 | Mar. 31, 2025 | Mar. 31, 2026 | Mar. 31, 2025
Derivative Instruments Gain Loss [Line Items] |  |  |  |
Gain (loss) recognized in Other comprehensive income (loss) ("OCI") | $ 6,745 | $ (15,014) | $ 6,156 | $ 10,226
Foreign Exchange Forward Contract and Options | Not Designated as Hedging Instrument | Other income, net |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |
Net realized and unrealized gain (loss), excluding the underlying foreign currency exposure being hedged | 931 | (917) | 1,143 | (360)
Forward Contracts | Designated as Hedging Instrument | Net Investment Hedging |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |
Gain (loss) recognized in Other comprehensive income (loss) ("OCI") | 8,942 | (19,898) | 8,160 | 13,550
Gain (loss) reclassified from OCI to earnings | 0 | 0 | 0 | 0
Gain recognized, excluded portion | $ 1,595 | $ 1,254 | $ 3,526 | $ 2,329

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