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Discontinued Operations (Amortization, Depreciation, and Purchase of PPE) (Details) - Etherios, Inc. - Discontinued Operations, Disposed of by Sale - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Amortization of identifiable intangible assets $ 30 $ 483 $ 513
Depreciation of property, equipment and improvements 0 29 21
Purchases of property, equipment, improvements and certain other intangible assets $ 0 $ (11) $ (144)