Common Stock and Equity Based Compensation (Details)					12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2009	Sep. 30, 2012 Common Stock [Member]	Sep. 30, 2011 Common Stock [Member]	Sep. 30, 2010 Common Stock [Member]	Sep. 30, 2012 Treasury Stock [Member]	Sep. 30, 2011 Treasury Stock [Member]	Sep. 30, 2010 Treasury Stock [Member]	Sep. 30, 2012 Common Stock Outstanding [Member]	Sep. 30, 2011 Common Stock Outstanding [Member]	Sep. 30, 2010 Common Stock Outstanding [Member]
Common stock share activity
Common Stock, Shares, Issued, Beginning Balance	115,624,594	115,507,094	115,400,294	115,261,294
Treasury Stock, Shares, Beginning Balance	(3,004,173)	(3,671,072)	(5,026,707)	(6,514,587)
Common Stock, Shares, Outstanding, Beginning Balance	112,620,421	111,836,022	110,373,587	108,746,707
Common Stock, Shares, Issued, Ending Balance	115,624,594	115,507,094	115,400,294	115,261,294
Treasury Stock, Shares, Ending Balance	(3,004,173)	(3,671,072)	(5,026,707)	(6,514,587)
Common Stock, Shares, Outstanding, Ending Balance	112,620,421	111,836,022	110,373,587	108,746,707
Issued
Employee and director plans								824,925	1,263,065	1,390,207	942,425	1,369,865	1,529,207
Employee and director plans, Issued					117,500	106,800	139,000
Dividend reinvestment plan								104,994	92,570	97,673	104,994	92,570	97,673
Shares reacquired - employee and director plans								(263,020)			(263,020)