Income Taxes (Components of Income Tax Expense) (Details) - USD ($) $ in Thousands	12 Months Ended
Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Components of income tax expense [Line Items]
Current Income Tax Expense (Benefit)	$ (203)	$ 5,397	$ (1,758)
Deferred income taxes	(2,812)	0	27,928
Income tax expense (benefit)	(3,015)	5,397	26,170
United States federal
Components of income tax expense [Line Items]
Current Income Tax Expense (Benefit)	(125)	4,153	(2,043)
Deferred income taxes	(2,878)	0	24,877
State
Components of income tax expense [Line Items]
Current Income Tax Expense (Benefit)	(78)	1,244	285
Deferred income taxes	$ 66	$ 0	$ 3,051

Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations.

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