Income Taxes - Components of Income Tax Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Income Taxes [Abstract]
Current Federal Tax Expense	$ (3,092)	$ 762	$ 417
Deferred Federal Income Tax Expense	6,384	(97,093)	(564)
Current State and Local Tax Expense	1,432	952	729
Deferred State and Local Income Tax Expense (Benefit)	487	(1,738)	79
Income Tax Expense (Benefit), Total	$ 5,211	$ (97,117)	$ 661