Retirement Benefits - Schedule of Weighted Average Allocation Of Plan Assets (Details)	Sep. 30, 2025	Sep. 30, 2024
Equity securities
Asset Allocation
Target Allocations	39.00%
As of the balance sheet date	45.00%	48.00%
Debt securities
Asset Allocation
Target Allocations	50.00%
As of the balance sheet date	46.00%	46.00%
Other
Asset Allocation
Target Allocations	11.00%
As of the balance sheet date	9.00%	6.00%

Percentage of target investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan.

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 17
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480482/715-20-55-17

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (d)(i)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-1

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