Retirement And Postretirement Benefit Plans (Schedule Of Health Care-Cost Trend Rates Were Assumed To Decrease) (Details)	12 Months Ended
Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2009
Retirement And Postretirement Benefit Plans
Year 1	7.25%	7.75%	8.25%
Year 2	6.75%	7.25%	7.75%
Year 3	6.25%	6.75%	7.25%
Year 4	5.75%	6.25%	6.75%
Year 5	5.25%	5.75%	6.25%
Year 6	5.00%	5.25%	5.75%
Year 7	5.00%	5.00%	5.25%
Year 8 and beyond	5.00%	5.00%	5.00%

Defined benefit plan health care cost trend rate assumed for year eight and after

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Defined benefit plan health care cost trend rate assumed for year five

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Defined benefit plan health care cost trend rate assumed for year four

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Defined benefit plan health care cost trend rate assumed for year one

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Defined benefit plan health care cost trend rate assumed for year seven

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Defined benefit plan health care cost trend rate assumed for year six

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Defined benefit plan health care cost trend rate assumed for year three

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Defined benefit plan health care cost trend rate assumed for year two

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