Income Taxes - Components of Income Tax Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Income Tax Disclosure [Abstract]
Current federal	$ (64)	$ (44,789)	$ (4,409)
Current state	520	322	(394)
Deferred federal	(314,651)	2,385	1,476
Deferred state	(10,374)	285	(162)
Total	$ (324,569)	$ (41,797)	$ (3,489)