Equity Transactions - Restricted Shares (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Unvested awards
Stock price (in dollars per share)	$ 5.90
Restricted shares
Restricted share activity
Unvested restricted shares at the beginning of the period (in shares)	2,661,245	2,367,187	1,897,827
Restricted shares granted (in shares)	849,352	1,504,655	1,298,604
Restricted shares vested (in shares)	(748,266)	(715,188)	(343,204)
Restricted shares cancelled (in shares)	(571,900)	(495,409)	(486,040)
Unvested restricted shares at the end of the period (in shares)	2,190,431	2,661,245	2,367,187
Weighted-Average Fair Value
Unvested restricted shares at the beginning of the period (in dollars per share)	$ 9.34	$ 16.08	$ 24.96
Granted (in dollars per share)	8.78	5.54	10.04
Restricted shares vested (in dollars per share)	11.04	16.09	27.50
Restricted shares cancelled (in dollars per share)	9.81	20.25	26.54
Unvested restricted shares at the end of the period (in dollars per share)	$ 8.42	$ 9.34	$ 16.08
Unvested awards
Intrinsic value of unvested restricted shares	$ 12.9
Weighted average remaining contractual life of unvested restricted shares	8 years 4 months 15 days
Service-based restricted stock options expected to vest (in options)	1,200,000