Common Stock and Equity-Based Compensation (Details)					12 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2009	Sep. 30, 2008	Sep. 30, 2011 Common Stock [Member]	Sep. 30, 2010 Common Stock [Member]	Sep. 30, 2009 Common Stock [Member]	Sep. 30, 2011 Treasury stock [Member]	Sep. 30, 2010 Treasury stock [Member]	Sep. 30, 2009 Treasury stock [Member]	Sep. 30, 2011 Common Stock Outstanding [Member]	Sep. 30, 2010 Common Stock Outstanding [Member]	Sep. 30, 2009 Common Stock Outstanding [Member]
Common stock share activity
Common Stock, Shares, Issued, Beginning Balance	115,507,094	115,400,294	115,261,294	115,247,694
Treasury Stock, Shares, Beginning Balance	(3,671,072)	(5,026,707)	(6,514,587)	(7,386,732)
Common Stock, Shares, Outstanding, Beginning Balance	111,836,022	110,373,587	108,746,707	107,860,962
Common Stock, Shares, Issued, Ending Balance	115,507,094	115,400,294	115,261,294	115,247,694
Treasury Stock, Shares, Ending Balance	(3,671,072)	(5,026,707)	(6,514,587)	(7,386,732)
Common Stock, Shares, Outstanding, Ending Balance	111,836,022	110,373,587	108,746,707	107,860,962
Issued
Employee and director plans								1,263,065	1,390,207	776,074	1,369,865	1,529,207	789,674
Employee and director plans, Issued					106,800	139,000	13,600
Dividend reinvestment plan								92,570	97,673	96,071	92,570	97,673	96,071