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Income and other Taxes (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2017
Mar. 31, 2016
Sep. 30, 2016
Income Tax Disclosure [Abstract]          
Income tax benefit $ 8 $ 155 $ (112) $ 153  
Income tax expense, discontinued operations $ 0 $ (200)   $ (184)  
Effective tax rate 0.40% (48.90%) (3.00%) (34.10%)  
Income tax penalties and interest accrued $ 300   $ 300   $ 300