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Discontinued Operations (Income (loss) from Discontinued Operations, Net of Tax) (Details) - Etherios, Inc. - Discontinued Operations, Disposed of by Sale - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Service revenue $ 891 $ 9,011
Cost of service 713 8,101
Gross profit 178 910
Operating expenses:    
Sales and marketing 148 1,970
Research and development 103 2,098
General and administrative 43 1,208
Restructuring 0 106
Total operating expenses 294 5,382
Loss from discontinued operations, before income taxes (116) (4,472)
Gain on sale of discontinued operations, before income taxes 2,870 0
Income (loss) from discontinued operations, before income taxes 2,754 (4,472)
Income tax benefit on discontinued operations (476) (1,627)
Income (loss) from discontinued operations, after income taxes $ 3,230 $ (2,845)