Retirement Plan and Incentive Awards - Schedule of Stock Options and SSARs Outstanding and Exercisable (Details) (SSARs and Stock Options, USD $)					12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2009	Sep. 30, 2012 $1 - $20	Sep. 30, 2012 $21 - $75	Sep. 30, 2012 $76 - $150	Sep. 30, 2012 $151 - $220	Sep. 30, 2012 $1 - $220
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
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)					274,381	92,673	7,703	55,216	429,973
Stock options / SSARs outstanding - weighted average contractual remaining life					5 years 5 months 23 days	4 years 7 months 10 days	3 months 26 days	1 year 6 months 26 days	4 years 8 months 12 days
Stock options / SSARs outstanding - weighted average exercise price ($ per share)	$ 40.80	$ 48.85	$ 113.45	$ 165.35	$ 17.04	$ 28.45	$ 96.45	$ 171.87	$ 40.8
Stock options / SSARs exercisable (shares)					121,317	63,352	7,703	55,216	247,588
Stock options / SSARs exercisable - weightedaverage contyractual remaining life					3 years 1 month 6 days	4 years 7 months 10 days	3 months 26 days	1 year 6 months 26 days	3 years 0 months 22 days
Stock options / SSARs exercisable - weighted average exercise price ($ per share)	$ 58.61	$ 64.65	$ 207.95		$ 15.79	$ 28.45	$ 96.45	$ 171.87	$ 58.61