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Commitments (Rent Expense) (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2015
Leases, Operating [Abstract]      
Rentals $ 1,342 $ 1,613 $ 2,076
Less: sublease rentals 0 (46) (56)
Total rental expense $ 1,342 $ 1,567 $ 2,020