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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) | 12 Months Ended
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Sep. 30, 2016 | Sep. 30, 2015
Cash and Cash Equivalents [Member] |  |
Target Acceptable Percentage of Plan Range Assets, Minimum | 0.00% |
Target Acceptable Percentage of Plan Range Assets, Maximum | 5.00% |
Asset Allocation | 3.00% | 1.00%
Cash and Cash Equivalents [Member] | Target Allocation 2017 [Member] |  |
Asset Allocation | 0.00% |
Return seeking [Member] |  |
Target Acceptable Percentage of Plan Range Assets, Minimum | 55.00% |
Target Acceptable Percentage of Plan Range Assets, Maximum | 65.00% |
Asset Allocation | 59.00% | 62.00%
Return seeking [Member] | Target Allocation 2017 [Member] |  |
Asset Allocation | 60.00% |
Hedge Funds, Equity [Member] |  |
Target Acceptable Percentage of Plan Range Assets, Minimum | 35.00% |
Target Acceptable Percentage of Plan Range Assets, Maximum | 45.00% |
Asset Allocation | 38.00% | 37.00%
Hedge Funds, Equity [Member] | Target Allocation 2017 [Member] |  |
Asset Allocation | 40.00% |

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- Definition Target allocation of investments of this type to total plan assets presented on a weighted average basis. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c)(i) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e2446-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(i) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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- Definition Target allocation maximum percentage of investments of this type to total plan assets presented on a weighted average basis. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c)(i) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e2446-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(i) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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- Definition Target allocation minimum percentage of investments of this type to total plan assets presented on a weighted average basis. + 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)(i) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c)(i) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e2446-114920 + Details
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