Retirement and Other Benefit Plans (Schedule Of Asset Allocation For Pension Plans Acceptable Range And Target Allocation By Asset Category) (Details)	12 Months Ended
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%

Target allocation of investments of this type to total plan assets presented on a weighted average basis.

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

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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

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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

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