Derivative Financial Instruments - Schedule of Derivative Instruments and Hedging Activities Disclosures (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2025	Mar. 31, 2024
Derivative Instruments Gain Loss [Line Items]
Gain (loss) recognized in Other comprehensive income (loss) ("OCI")	$ (15,014)	$ 6,432	$ 10,226	$ (5,079)
Derivative, Excluded Component, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Nonoperating Income (Expense)	Nonoperating Income (Expense)	Nonoperating Income (Expense)	Nonoperating Income (Expense)
Foreign Exchange Forward Contract and Options \| Not Designated as Hedging Instrument
Derivative Instruments Gain Loss [Line Items]
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Nonoperating Income (Expense)	Nonoperating Income (Expense)	Nonoperating Income (Expense)	Nonoperating Income (Expense)
Foreign Exchange Forward Contract and Options \| Not Designated as Hedging Instrument \| Other income (expense), net
Derivative Instruments Gain Loss [Line Items]
Net realized and unrealized gain (loss), excluding the underlying foreign currency exposure being hedged	$ (917)	$ (1,286)	$ (360)	$ (5,022)
Forward Contracts \| Designated as Hedging Instrument \| Net Investment Hedging
Derivative Instruments Gain Loss [Line Items]
Gain (loss) recognized in Other comprehensive income (loss) ("OCI")	(19,898)	8,552	13,550	(6,752)
Gain (loss) reclassified from OCI to earnings	0	0	0	0
Gain recognized, excluded portion	$ 1,254	$ 1,079	$ 2,329	$ 2,215

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

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Indicates line item in statement of income or comprehensive income that includes gain (loss) recognized in earnings from excluded component of derivative hedge.

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Indicates line item in statement of income or comprehensive income that includes gain (loss) from derivative.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments.

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Amount, before tax and reclassification, of gain (loss) from derivative designated and qualifying as net investment hedge.

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Amount, before tax, of reclassification from accumulated other comprehensive income (AOCI) for gain (loss) from derivative designated and qualifying as net investment hedge.

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