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Retirement Benefits (Schedule of Allocation of Plan Assets, Actual and Target Allocations) (Details) - Defined Benefit Pension Plan [Member] | Sep. 30, 2024 | Sep. 30, 2023
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United States [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Percentage of Plan Assets | 100.00% | 100.00%
United States [Member] | Equity Securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Percentage of Plan Assets | 30.50% | 31.90%
United States [Member] | Equity Securities | Minimum [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target Allocation Ranges | 2.30% | 2.30%
United States [Member] | Equity Securities | Maximum [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target Allocation Ranges | 51.10% | 51.20%
United States [Member] | Debt Securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Percentage of Plan Assets | 67.60% | 66.60%
United States [Member] | Debt Securities | Minimum [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target Allocation Ranges | 58.90% | 58.80%
United States [Member] | Debt Securities | Maximum [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target Allocation Ranges | 96.70% | 96.50%
United States [Member] | Other Investment Asset |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Percentage of Plan Assets | 1.90% | 1.50%
United States [Member] | Other Investment Asset | Minimum [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target Allocation Ranges | 0.00% | 0.00%
United Kingdom |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Percentage of Plan Assets | 100.00% | 100.00%
United Kingdom | Equity Securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Percentage of Plan Assets | 0.00% | 20.70%
United Kingdom | Equity Securities | Minimum [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target Allocation Ranges | 0.00% | 10.00%
United Kingdom | Equity Securities | Maximum [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target Allocation Ranges |  | 30.00%
United Kingdom | Debt Securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Percentage of Plan Assets | 95.80% | 79.20%
United Kingdom | Debt Securities | Minimum [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target Allocation Ranges | 90.00% | 70.00%
United Kingdom | Debt Securities | Maximum [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target Allocation Ranges | 100.00% | 90.00%
United Kingdom | Other Investment Asset |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Percentage of Plan Assets | 4.20% | 0.10%
United Kingdom | Other Investment Asset | Minimum [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target Allocation Ranges | 0.00% | 0.00%
United Kingdom | Other Investment Asset | Maximum [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target Allocation Ranges | 10.00% |
Japan |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Percentage of Plan Assets | 100.00% | 100.00%
Japan | Equity Securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Percentage of Plan Assets | 39.70% | 40.00%
Japan | Equity Securities | Minimum [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target Allocation Ranges | 36.00% | 36.00%
Japan | Equity Securities | Maximum [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target Allocation Ranges | 44.00% | 44.00%
Japan | Debt Securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Percentage of Plan Assets | 59.40% | 60.00%
Japan | Debt Securities | Minimum [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target Allocation Ranges | 55.00% | 55.00%
Japan | Debt Securities | Maximum [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target Allocation Ranges | 63.00% | 63.00%
Japan | Other Investment Asset |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Percentage of Plan Assets | 0.90% | 0.00%
Japan | Other Investment Asset | Minimum [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target Allocation Ranges | 0.00% | 0.00%
Japan | Other Investment Asset | Maximum [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target Allocation Ranges | 2.00% | 2.00%

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- Definition 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. + References 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 + Details
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- Definition Percentage of actual investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -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 + Details
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