Income Taxes - Effective Tax Rate Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Effective Income Tax Rate Reconciliation [Line Items]
Income Tax Reconciliation, Income Tax Expense (Benefit), at Federal Statutory Income Tax Rate	$ 8,316	$ 6,139	$ 2,195
Income Tax Expense (Benefit)	(97,117)	661	748
Increase Resulting From [Member]
Effective Income Tax Rate Reconciliation [Line Items]
Alternative Minimum Tax	0	417	0
Income Tax Reconciliation, Nondeductible Expense	1,557	753	563
Long-lived Assets	0	69	0
Income Tax Reconciliation, State and Local Income Taxes	1,105	937	544
Contingent Tax Liabilities	0	51	0
Effective Income Tax Rate Rec Other	0	54	0
Decrease Resulting From [Member]
Effective Income Tax Rate Reconciliation [Line Items]
Contingent Tax Liabilities	(96)	0	(1)
Effective Income Tax Rate Rec Other	988	0	(6)
Change in valuation allowance	(108,987)	(7,034)	(2,547)
Valuation Allowance Adjustment Acquisition	$ 0	$ (725)	$ 0