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Derivative Financial Instruments - Additional Information (Details) - USD ($)	9 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Sep. 30, 2024
Derivatives, Fair Value [Line Items]
Outstanding hedge contracts			$ 0
Foreign Exchange Contract | Other Income (Expense)
Derivatives, Fair Value [Line Items]
Realized foreign exchange forward contract gain	$ 7,000,000	$ (1,000,000)
Unrealized foreign exchange forward contract gain (loss)	(5,000,000)	$ 1,000,000
Sale
Derivatives, Fair Value [Line Items]
Outstanding hedge contracts	197,000,000
Purchase
Derivatives, Fair Value [Line Items]
Outstanding hedge contracts	$ 124,000,000

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- Definition

Nominal or face amount used to calculate payment on derivative.

+ References

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-Section 55
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-Publisher FASB
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- Definition

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+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
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Unrealized Gain (Loss) on Fair Value Hedges Recognized in Earnings

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