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Reconciliation of the Total Amounts of Unrecognized Tax Liabilities (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2015
Income Tax Disclosure [Abstract]      
Unrecognized Tax Liabilities, Beginning Balance $ 1 $ 75 $ 301
Change in prior year tax positions $ (1) (70) (187)
Current tax positions     17
Settlements with taxing authorities   0  
Lapse of statute of limitations   (4) (56)
Unrecognized Tax Liabilities, Ending Balance   $ 1 $ 75