Retirement Plan And Other Post-Retirement Benefits (Schedule Of Health Care Cost Trend Rates) (Details)	12 Months Ended
	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2012
Compensation and Retirement Disclosure [Abstract]
Rate of Increase for Pre Age 65 Participants	7.10%	[1]	7.28%	[1]	7.46%	[1]
Rate of Increase for Post Age 65 Participants	6.73%	[1]	6.78%	[1]	6.84%	[1]
Annual Rate of Increase in the Per Capita Cost of Covered Prescription Drug Benefits	7.47%	[1]	7.78%	[1]	8.08%	[1]
Annual Rate of Increase in the Per Capita Medicare Part B Reimbursement	6.73%	[1]	6.78%	[1]	6.84%	[1]
Annual Rate of Increase in the Per Capita Medicare Part D Subsidy	6.79%	[1]	7.03%	[1]	7.13%	[1]
Ultimate health care trend rate by 2028	4.50%

[1] It was assumed that this rate would gradually decline to 4.5% by 2028.