Derivative Financial Instruments - Schedule of Derivative Instruments and Hedging Activities Disclosures (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Derivative Instruments Gain Loss [Line Items]
Gain (loss) recognized in Other comprehensive income (loss) ("OCI")	$ (589)	$ 25,240
Foreign Exchange Forward Contract and Options | Not Designated as Hedging Instrument | Other expense, net
Derivative Instruments Gain Loss [Line Items]
Net realized and unrealized gain, excluding the underlying foreign currency exposure being hedged	212	558
Forward Contracts | Designated as Hedging Instrument | Net Investment Hedging
Derivative Instruments Gain Loss [Line Items]
Gain (loss) recognized in Other comprehensive income (loss) ("OCI")	(782)	33,448
Gain (loss) reclassified from OCI to earnings	0	0
Gain recognized, excluded portion	$ 1,931	$ 1,075