Stock-based Compensation - Schedule of Stock Options and SSARs Outstanding and Related Activity (Details) - Stock Options - $ / shares	12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Shares [Roll Forward]
Outstanding at beginning of period (in shares)	643,907	650,223	560,784
Granted (in shares)	125,449	0	161,010
Exercised (in shares)	0	(1,209)	(2,788)
Expired (in shares)	(86,606)	0	(55,811)
Forfeited (in shares)	(10,081)	(5,107)	(12,972)
Outstanding at end of period (in shares)	672,669	643,907	650,223
Exercisable at end of period (in shares)	503,594	491,029	355,703
Vested or expected to vet in the future (in shares)	672,669	643,877	649,773
Weighted-Average Exercise Price [Roll Forward]
Outstanding at beginning or period (in dollars per share)	$ 18.13	$ 18.12	$ 33.01
Granted (in dollars per share)	9.19	0.00	19.11
Exercised (in dollars per share)	0.00	12.07	14.29
Expired (in dollars per share)	19.70	0.00	170.32
Forfeited (in dollars per share)	10.98	19.05	19.85
Outstanding at end of period (in dollars per share)	16.49	18.13	18.12
Exercisable at end of period (in dollars per share)	17.76	18.40	19.74
Vested or expected to vest in the future (in dollars per share)	$ 16.49	$ 18.13	$ 18.12