Retirement Benefits - Schedule of Weighted Average Allocation Of Plan Assets (Details) |
Sep. 30, 2026 |
Sep. 30, 2025 |
|---|---|---|
| Equity securities | ||
| Asset Allocation | ||
| Target Allocations | 32.00% | |
| As of the balance sheet date | 36.00% | 45.00% |
| Debt securities | ||
| Asset Allocation | ||
| Target Allocations | 54.00% | |
| As of the balance sheet date | 55.00% | 46.00% |
| Other | ||
| Asset Allocation | ||
| Target Allocations | 14.00% | |
| As of the balance sheet date | 9.00% | 9.00% |