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Retirement Plans (Strategic Allocation of Plan Assets) (Details) | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015
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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% |
Equity Securities [Member] |  |  |  |
Strategic asset allocation |  |  |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 20.00% |  | 30.00% | 40.00%
Actual asset allocations |  |  |  |
Actual plan asset allocations | 21.00% | 21.00% | 29.00% |
Fixed Income Securities [Member] |  |  |  |
Strategic asset allocation |  |  |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 80.00% |  |  |
Fixed Income Funds [Member] |  |  |  |
Actual asset allocations |  |  |  |
Actual plan asset allocations | 77.00% | 78.00% | 69.00% |
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 | 2.00% | 1.00% | 2.00% |
Minimum [Member] | Equity Securities [Member] |  |  |  |
Strategic asset allocation |  |  |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 15.00% |  |  |
Minimum [Member] | Fixed Income Funds [Member] |  |  |  |
Strategic asset allocation |  |  |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 75.00% |  |  |
Minimum [Member] | Cash and Cash Equivalents [Member] |  |  |  |
Strategic asset allocation |  |  |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 0.00% |  |  |
Maximum [Member] | Fixed Income Funds [Member] |  |  |  |
Strategic asset allocation |  |  |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 80.00% |  |  |
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 -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=112275985&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(i) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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