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

Amount of gain (loss) from excluded component of derivative hedge, recognized in earnings. Excludes recognition under systematic and rational method.

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