Capitalization And Short-Term Borrowings (Narrative) (Details) (USD $)	12 Months Ended																												0 Months Ended			12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2014 Stock Options And SARs [Member]	Sep. 30, 2014 Stock Options [Member]	Sep. 30, 2013 Stock Options [Member]	Sep. 30, 2012 Stock Options [Member]	Sep. 30, 2014 Stock Appreciation Rights (SARs) [Member]	Sep. 30, 2013 Stock Appreciation Rights (SARs) [Member]	Sep. 30, 2012 Stock Appreciation Rights (SARs) [Member]	Sep. 30, 2014 Stock Appreciation Right [Member]	Sep. 30, 2013 Stock Appreciation Right [Member]	Sep. 30, 2012 Stock Appreciation Right [Member]	Sep. 30, 2014 Restricted Share Awards [Member]	Sep. 30, 2013 Restricted Share Awards [Member]	Sep. 30, 2012 Restricted Share Awards [Member]	Sep. 30, 2014 Non-Performance Based Restricted Stock Units (RSUs) [Member]	Sep. 30, 2013 Non-Performance Based Restricted Stock Units (RSUs) [Member]	Sep. 30, 2012 Non-Performance Based Restricted Stock Units (RSUs) [Member]	Sep. 30, 2014 Performance Based Restricted Stock Units (RSUs) [Member]	Sep. 30, 2013 Performance Based Restricted Stock Units (RSUs) [Member]	Sep. 30, 2012 Performance Based Restricted Stock Units (RSUs) [Member]	Sep. 30, 2014 Performance Shares [Member]	Sep. 30, 2013 Performance Shares [Member]	Sep. 30, 2012 Performance Shares [Member]	Sep. 30, 2014 Restricted Stock Units (RSUs) [Member]	Sep. 30, 2014 Restricted Stock [Member]	Mar. 31, 2013 5.25% Notes Due March 2013 [Member]	Feb. 15, 2013 3.75% Notes Due In March 1, 2023 [Member]	Sep. 30, 2014 Indenture From 1974 [Member]	Sep. 30, 2014 Commercial Paper [Member]	Sep. 30, 2014 2015 [Member] Restricted Share Awards [Member]	Sep. 30, 2014 2015 [Member] Non-Performance Based Restricted Stock Units (RSUs) [Member]	Sep. 30, 2014 2016 [Member] Restricted Share Awards [Member]	Sep. 30, 2014 2016 [Member] Non-Performance Based Restricted Stock Units (RSUs) [Member]	Sep. 30, 2014 2016 [Member] Performance Based Restricted Stock Units (RSUs) [Member]	Sep. 30, 2014 2017 [Member] Non-Performance Based Restricted Stock Units (RSUs) [Member]	Sep. 30, 2014 2017 [Member] Performance Shares [Member]	Sep. 30, 2014 2018 [Member] Restricted Share Awards [Member]	Sep. 30, 2014 2018 [Member] Non-Performance Based Restricted Stock Units (RSUs) [Member]	Sep. 30, 2014 2019 [Member] Non-Performance Based Restricted Stock Units (RSUs) [Member]	Sep. 30, 2014 2021 [Member] Restricted Share Awards [Member]	Sep. 30, 2014 Board Of Directors [Member]
Debt Instrument [Line Items]
Issue shares of common stock for the Direct Stock Purchase and Dividend Reinvestment Plan	93,731
Common stock issued for 401(k) plans	69,729
Common stock shares issued due to stock option and SARs exercises	(321,500)			433,602
Common stock issued																										12,432																	15,412
Shares tendered	126,321
Number of Shares Forfeited								0						3,334			8,700			21,728			17,624				3,334
Percentage of voting power	10.00%
Percentage of assets or earning power that are sold or transferred	50.00%
Equity redemption price per share	$ 0.01
Voting power percentage to redeem rights	75.00%
Rights expiration date	Jul. 31, 2018
Share-Based Payment Expense	$ 10,500,000	$ 11,500,000	$ 7,200,000
Tax benefit related to stock-based compensation expense	4,300,000	4,600,000	2,900,000
Capitalized stock-based compensation costs	100,000	100,000	0
Tax benefit realized from exercise of stock-based compensation	3,100,000	3,600,000	14,200,000
Tax benefit recorded from exercise of stock-based compensation	4,600,000	700,000	1,000,000
Options, exercises in period, total intrinsic value					13,700,000	11,600,000	13,500,000
Proceeds from Stock Options Exercised					7,400,000	2,600,000	7,600,000
Number of Shares Granted								0	412,970	166,000				0	0	41,525	82,151	44,200	68,450	0	255,604	0	116,090	0	0
Weighted Average Fair Value per Award Granted									$ 10.66	$ 11.20				$ 0.00		$ 55.09	$ 65.24	$ 51.11	$ 47.10	$ 0.00	$ 49.51		$ 67.16
Total intrinsic value of SAR's exercised								8,400,000	800,000	100,000
Number of Awards Vested											323,188	287,168	435,169	34,601			12,432			0			0
Equity instruments other than options, vested in period, total fair value								3,800,000	3,600,000	3,800,000
Unrecognized compensation expense								500,000						1,300,000			5,400,000			3,100,000			4,600,000
Unrecognized compensation expense recognized weighted average period								8 months 0 days						2 years 8 months 6 days			1 year 8 months 15 days			1 year 0 months			1 year 6 months 0 days
Non-vested stock-based compensation lapse																																29,518	49,340	5,000	61,534	233,876	59,893	98,466	35,000	22,967	10,785	20,000
Carrying Amount	1,649,000,000	1,649,000,000																												99,000,000
Long-term debt, face value																													500,000,000
Percentage of Long-Term Debt issued under 1974 Indenture	6.00%
Long-term debt, interest rate																												5.25%	3.75%
Principal amounts of long-term debt maturing in 2015	0
Principal amounts of long-term debt maturing in 2016	0
Principal amounts of long-term debt maturing in 2017	0
Principal amounts of long-term debt maturing in 2018	300,000,000
Principal amounts of long-term debt maturing in 2019	250,000,000
Principal amounts of long-term debt maturing after 2019	1,099,000,000
Commercial paper available	300,000,000
Line of Credit Facility, Maximum Borrowing Capacity	750,000,000.0
Commercial paper, outstanding	85,600,000	0
Weighted average interest rate																															0.31%
Line of Credit Facility, Expiration Date	Jan. 06, 2017
Short-term notes payable outstanding	0	0
Committed credit facility debt to capitalization ratio	0.65
Debt to capitalization ratio	0.42
Additional borrowing	2,740,000,000
Maximum debt increase under existing indenture covenants	1,920,000,000
Aggregated indebtedness	40,000,000
Net proceeds from issuance of long-term debt	0	495,415,000	496,085,000																										495,400,000
Current portion of long-term debt																												250,000,000
Preferred stock, shares authorized	10,000,000
Preferred stock par value	$ 1
Committed credit facility, outstanding amount	$ 0