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Discontinued Operations (Capital Loss Carryforward) (Details) - Etherios, Inc. - Discontinued Operations, Disposed of by Sale - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
Oct. 23, 2015
Tax Credit Carryforward [Line Items]        
Income tax benefit on discontinued operations $ (476) $ (1,627) $ (1,522)  
Capital Loss on Sale        
Tax Credit Carryforward [Line Items]        
Deferred Tax Assets, Capital Loss on Sale       $ 13,700
Tax Credit Carryforward, Valuation Allowance       $ 5,100