Income Taxes - Income Tax Provision (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Current tax benefit (provision):
Federal, Current		$ (272)	$ 8	$ 65
State, Current		246	(2,027)	(1,973)
Total current tax provision		(26)	(2,019)	(1,908)
Deferred tax benefit (provision):
Federal, Deferred		(23,332)	(14,100)	(10,956)
State, Deferred		810	1,300	1,296
Change in valuation allowance		(208)	109,277	7,994
Total deferred tax benefit (provision)		(22,730)	96,477	(1,666)
Income tax benefit (provision)	$ 96,800	$ (22,756)	$ 94,458	$ (3,574)