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Derivative Financial Instruments - Additional Information (Details) - USD ($)	6 Months Ended
	Mar. 31, 2025	Mar. 31, 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)	3,000,000	$ 0
Sale
Derivatives, Fair Value [Line Items]
Outstanding hedge contracts	369,000,000
Purchase
Derivatives, Fair Value [Line Items]
Outstanding hedge contracts	$ 206,000,000

X

- Definition

Nominal or face amount used to calculate payment on derivative.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1B
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480434/815-10-50-1B

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1A
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480434/815-10-50-1A

+ Details

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X

- Definition

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.

+ References

No definition available.

+ Details

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- Definition

Realized Gain (Loss) on Fair Value Hedges Recognized in Earnings

+ References

No definition available.

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- Definition

Unrealized Gain (Loss) on Fair Value Hedges Recognized in Earnings

+ References

No definition available.

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