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Income Taxes (Reconciliation of Tax Rate) (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Income Tax Disclosure [Abstract]      
Income tax expense at statutory rate $ (8,746) $ (956) $ (7,534)
State income taxes, net of federal tax benefit (12) 302 (531)
Change in federal statutory rate 12,645 0 51
Increase (decrease) in valuation allowance (7,066) 6,192 34,184
Other, net 164 (141) 0
Income tax expense (benefit) $ (3,015) $ 5,397 $ 26,170