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Retirement and Other Benefit Plans (Schedule Of Asset Allocation For Pension Plans Acceptable Range And Target Allocation By Asset Category) (Details) | Sep. 30, 2017 | Sep. 30, 2016
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Cash and Cash Equivalents [Member] |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 3.00% | 3.00%
Cash and Cash Equivalents [Member] | Maximum [Member] |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 5.00% |
Cash and Cash Equivalents [Member] | Minimum [Member] |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 0.00% |
Cash and Cash Equivalents [Member] | Target Allocation 2017 [Member] |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 0.00% |
Return seeking [Member] |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 62.00% | 59.00%
Return seeking [Member] | Maximum [Member] |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 65.00% |
Return seeking [Member] | Minimum [Member] |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 55.00% |
Return seeking [Member] | Target Allocation 2017 [Member] |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 60.00% |
Hedge Funds, Equity [Member] |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 35.00% | 38.00%
Hedge Funds, Equity [Member] | Maximum [Member] |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 45.00% |
Hedge Funds, Equity [Member] | Minimum [Member] |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 35.00% |
Hedge Funds, Equity [Member] | Target Allocation 2017 [Member] |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 40.00% |

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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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(5)(i) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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