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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
Oct. 23, 2015
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Service revenue   $ 891 $ 9,011 $ 9,528
Cost of service   713 8,101 9,421
Gross profit   178 910 107
Operating expenses:        
Sales and marketing   148 1,970 1,825
Research and development   103 2,098 877
General and administrative   43 1,208 1,669
Restructuring   0 106 0
Total operating expenses   294 5,382 4,371
Loss from discontinued operations, before income taxes   (116) (4,472) (4,264)
Gain on sale of discontinued operations, before income taxes $ 2,870 2,870 0 0
Income (loss) from discontinued operations, before income taxes   2,754 (4,472) (4,264)
Income tax benefit on discontinued operations   (476) (1,627) (1,522)
Income (loss) from discontinued operations, after income taxes   $ 3,230 $ (2,845) $ (2,742)