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Summary of Significant Accounting Policies (Supplemental Disclosures of Cash Flow Information) (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
Supplemental Cash Flow Information [Abstract]      
Interest, net of interest income $ 4 $ 70 $ 149
Income taxes, net of refunds (352) 2,298 18,889
Non-cash capital expenditures $ 221 $ 147 $ 13,527