Retirement Plan and Incentive Awards - Schedule of Stock Options and SSARs Outstanding and Related Activity (Details) (SSARs and Stock Options, USD $)	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
SSARs and Stock Options
Shares [Roll Forward]
Outstanding at beginning of period	375,248	515,671	421,783
Granted	109,507	150,853	201,229
Expired	(10,948)	(148,393)	(6,396)
Canceled/exchanged	0	0	(93,187)
Forfeited	(43,834)	(142,883)	(7,758)
Outstanding at end of period	429,973	375,248	515,671
Exercisable at end of period	247,588	163,076	154,132
Vested or expected to vest in the future	428,597	367,693	460,587
Weighted-Average Exercise Price [Roll Forward]
Outstanding at beginning of period	$ 48.85	$ 113.45	$ 165.35
Granted	$ 10.80	$ 23.45	$ 28.45
Expired	$ 82.51	$ 270.10	$ 137.55
Canceled/exchanged		$ 0.00	$ 165.20
Forfeited	$ 24.13	$ 25.45	$ 90.80
Outstanding at end of period	$ 40.80	$ 48.85	$ 113.45
Exercisable at end of period	$ 58.61	$ 64.65	$ 207.95
Vested or expected to vest in the future	$ 40.88	$ 49.30	$ 102.75