Stock-Based Compensation Plans (Details 2) (USD $)	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
Schedule of stock option activity
Number of shares outstanding, beginning balance	1,515,188	1,492,321	1,669,570
Number of shares, granted	299,832	551,773	388,635
Number of shares, exercised	(11,379)		(20,350)
Number of shares, forfeited	(478,203)	(528,906)	(545,534)
Number of shares outstanding, ending balance	1,325,438	1,515,188	1,492,321
Weighted average exercise price, beginning balance	$ 25.59	$ 31.22	$ 32.82
Weighted average exercise price, granted	$ 12.46	$ 9.96	$ 22.88
Weighted average exercise price, exercised	$ 10.03		$ 20.74
Weighted average exercise price, forfeited	$ 29.76	$ 25.15	$ 30.58
Weighted average exercise price, ending balance	$ 21.25	$ 25.59	$ 31.22
Number of shares, exercisable	661,006
Weighted average exercise price, exercisable	$ 29.67