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Retirement Benefits - Schedule of Weighted Average Allocation Of Plan Assets (Details) | Sep. 30, 2025 | Sep. 30, 2024
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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%

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