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Employee Benefit Plans (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Retirement Benefits [Abstract]
Employee benefit plan obligation	$ 58	$ 52
Aggregate pension liability recorded in balance sheet	38	35
Pension expense	3	3	$ 3
Employers contribution plan expense	$ 16	$ 14	$ 12

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- Definition

Amount of liability, recognized in statement of financial position, for defined benefit pension plan. Excludes other postretirement benefit plan.

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-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(15))
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-Topic 715
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-Section 45
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-URI https://asc.fasb.org/1943274/2147480506/715-20-50-1

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Amount of actuarial present value of benefits attributed to service rendered by employee for defined benefit plan.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
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-URI https://asc.fasb.org/1943274/2147480506/715-20-50-1

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Amount of cost for defined contribution plan.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 70
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
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Amount of cost (reversal of cost) for pension benefits. Excludes other postretirement benefits.

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-Topic 280
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