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v3.25.3

Retirement Benefits (Schedule of Allocation of Plan Assets, Actual and Target Allocations) (Details) - Defined Benefit Pension Plan [Member] | Sep. 30, 2025 | Sep. 30, 2024
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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 | 31.60% | 30.50%
United States [Member] | Equity Securities | Minimum [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target Allocation Ranges | 2.10% | 2.30%
United States [Member] | Equity Securities | Maximum [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target Allocation Ranges | 51.10% | 51.10%
United States [Member] | Debt Securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Percentage of Plan Assets | 67.20% | 67.60%
United States [Member] | Debt Securities | Minimum [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target Allocation Ranges | 58.90% | 58.90%
United States [Member] | Debt Securities | Maximum [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target Allocation Ranges | 96.80% | 96.70%
United States [Member] | Other Investment Asset |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Percentage of Plan Assets | 1.20% | 1.90%
United States [Member] | Other Investment Asset | Minimum [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target Allocation Ranges | 0.00% |
United States [Member] | Other Investment Asset | Maximum [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target Allocation Ranges |  | 0.00%
United Kingdom |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Percentage of Plan Assets | 100.00% | 100.00%
United Kingdom | Debt Securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Percentage of Plan Assets | 0.00% | 95.80%
United Kingdom | Debt Securities | Minimum [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target Allocation Ranges | 0.00% | 90.00%
United Kingdom | Debt Securities | Maximum [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target Allocation Ranges |  | 100.00%
United Kingdom | Insurance Contract |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Percentage of Plan Assets | 76.20% | 0.00%
United Kingdom | Insurance Contract | Minimum [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target Allocation Ranges | 90.00% |
United Kingdom | Insurance Contract | Maximum [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target Allocation Ranges | 100.00% | 0.00%
United Kingdom | Other Investment Asset |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Percentage of Plan Assets | 23.80% | 4.20%
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 | 40.80% | 39.70%
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 | 58.30% | 59.40%
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 | 1.00% | 0.90%
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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