Retirement Plan and Incentive Awards - Schedule of Stock Options and SSARs Outstanding and Exercisable (Details) (USD $) In Millions, except Share data, unless otherwise specified						12 Months Ended
	Sep. 30, 2013	Sep. 30, 2013 SSARs and Stock Options	Sep. 30, 2012 SSARs and Stock Options	Sep. 30, 2011 SSARs and Stock Options	Sep. 30, 2010 SSARs and Stock Options	Sep. 30, 2013 $1 - $20 SSARs and Stock Options	Sep. 30, 2013 $21 - $75 SSARs and Stock Options	Sep. 30, 2013 $76 - $150 SSARs and Stock Options	Sep. 30, 2013 $151 - $220 SSARs and Stock Options	Sep. 30, 2013 $1 - $220 SSARs and Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value	$ 0.3
Stock options / SSARs - exercise price range, lower limit						$ 1	$ 21	$ 76	$ 151	$ 1
Stock options / SSARs - exercise price range, upper limit						$ 20	$ 75	$ 150	$ 220	$ 220
Stock options / SSARs outstanding (shares)						357,297	148,271	0	55,216	560,784
Stock options / SSARs outstanding - weighted average contractual remaining life						5 years 8 months 28 days	3 years 10 months 6 days	0 days	6 months 26 days	4 years 8 months 23 days
Stock options / SSARs outstanding - weighted average exercise price ($ per share)		$ 33.01	$ 40.80	$ 48.85	$ 113.45	$ 14.26	$ 26.47	$ 0	$ 171.87	$ 33.01
Stock options / SSARs exercisable (shares)						127,739	127,165	0	55,216	310,120
Stock options / SSARs exercisable - weightedaverage contyractual remaining life						3 years 9 months 26 days	3 years 9 months 7 days	0 days	6 months 26 days	3 years 2 months 19 days
Stock options / SSARs exercisable - weighted average exercise price ($ per share)		$ 48.73	$ 58.61	$ 64.65		$ 17.18	$ 26.95	$ 0	$ 171.87	$ 48.73