Stock-based Compensation - Schedule of Stock Options and SSARs Outstanding and Related Activity (Details) - Stock Options - $ / shares	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Shares [Roll Forward]
Stock options, Outstanding, Number (in shares)	650,223	560,784	429,973
Granted (in shares)	0	161,010	160,651
Exercised (in shares)	(1,209)	(2,788)	(681)
Expired (in shares)	0	(55,811)	(22,914)
Forfeited (in shares)	(5,107)	(12,972)	(6,245)
Stock options, Outstanding, Number (in shares)	643,907	650,223	560,784
Stock options, Exercisable, Number (in shares)	491,029	355,703	310,120
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number (in shares)	643,877	649,773	558,519
Weighted-Average Exercise Price [Roll Forward]
Stock options, Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 18.12	$ 33.01	$ 48.80
Granted (in dollars per share)	0.00	19.11	13.56
Exercised (in dollars per share)	12.07	14.29	10.80
Expired (in dollars per share)	0.00	170.32	47.65
Forfeited (in dollars per share)	19.05	19.85	17.93
Stock options, Outstanding, Weighted Average Exercise Price (in dollars per share)	18.13	18.12	33.01
Stock options, Exercisable, Weighted Average Exercise Price (in dollars per share)	18.40	19.74	48.73
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 18.13	$ 18.12	$ 33.09