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Retirement Plans (Strategic Allocation of Plan Assets) (Details) | Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022
--- | --- | --- | ---
Strategic asset allocation |  |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 100.00% |  |
Actual asset allocations |  |  |
Actual plan asset allocations | 100.00% | 100.00% | 100.00%
Fixed Income Securities [Member] |  |  |
Strategic asset allocation |  |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 70.00% |  |
Actual asset allocations |  |  |
Actual plan asset allocations | 69.00% | 70.00% | 70.00%
Equity Securities [Member] |  |  |
Strategic asset allocation |  |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 30.00% |  |
Actual asset allocations |  |  |
Actual plan asset allocations | 30.00% | 29.00% | 29.00%
Cash and Cash Equivalents [Member] |  |  |
Strategic asset allocation |  |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 0.00% |  |
Actual asset allocations |  |  |
Actual plan asset allocations | 1.00% | 1.00% | 1.00%
Minimum [Member] | Fixed Income Securities [Member] |  |  |
Strategic asset allocation |  |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 67.00% |  |
Minimum [Member] | Equity Securities [Member] |  |  |
Strategic asset allocation |  |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 27.00% |  |
Minimum [Member] | Cash and Cash Equivalents [Member] |  |  |
Strategic asset allocation |  |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 0.00% |  |
Maximum [Member] | Fixed Income Securities [Member] |  |  |
Strategic asset allocation |  |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 73.00% |  |
Maximum [Member] | Equity Securities [Member] |  |  |
Strategic asset allocation |  |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 33.00% |  |
Maximum [Member] | Cash and Cash Equivalents [Member] |  |  |
Strategic asset allocation |  |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 5.00% |  |

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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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