Equity Securities and Stock-Based Compensation - Stock Options (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Stock options
Shares
Outstanding, Beginning Balance	96	181	618
Forfeited or expired	(72)	(85)	(437)
Outstanding, Ending Balance	24	96	181
Exercisable	24	96	181
Weighted-average exercise price
Beginning Balance	$ 27.99	$ 30.17	$ 27.42
Forfeited or expired	32.80	32.62	26.28
Ending Balance	13.57	27.99	30.17
Exercisable	$ 13.57	$ 27.99	$ 30.17
Additional Disclosures
Weighted-average remaining contractual term, Outstanding	1 year 1 month 6 days	9 months 18 days	1 year
Weighted-average remaining contractual term, Exercisable	1 year 1 month 6 days	9 months 18 days	1 year
Aggregate intrinsic value, Outstanding	$ 80	$ 126	$ 0
Aggregate intrinsic value, Exercisable	$ 80	$ 126	$ 0
Stock Appreciation Rights (SARs)
Shares
Outstanding, Beginning Balance	3,578	3,730	3,639
Granted	173	234	314
Exercised	(195)	(344)	(146)
Forfeited or expired	(81)	(42)	(77)
Outstanding, Ending Balance	3,475	3,578	3,730
Exercisable	3,283	3,320	3,418
Weighted-average exercise price
Beginning Balance	$ 7.52	$ 7.31	$ 7.25
Granted	17.83	13.03	9.19
Exercised	7.85	6.92	5.18
Forfeited or expired	30.73	24.83	16.15
Ending Balance	7.47	7.52	7.31
Exercisable	$ 6.98	$ 7.21	$ 7.21
Additional Disclosures
Weighted-average remaining contractual term, Outstanding	4 years 6 months	5 years 1 month 6 days	5 years 8 months 12 days
Weighted-average remaining contractual term, Exercisable	4 years 2 months 12 days	4 years 9 months 18 days	5 years 6 months
Aggregate intrinsic value, Outstanding	$ 33,461	$ 41,685	$ 22,893
Aggregate intrinsic value, Exercisable	$ 33,161	$ 39,793	$ 21,604
Weighted-average grant-date fair value of SARs granted	$ 9.37	$ 6.41	$ 4.40
Total intrinsic value	$ 2,100	$ 3,900	$ 1,100