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Discontinued Operations (Gain on Sale Subject to Working Capital Adjustments) (Details) - 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]        
Net cash proceeds   $ 2,849 $ 0 $ 0
Etherios, Inc. | Discontinued Operations, Disposed of by Sale        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Gross proceeds $ 4,096      
Employee related liabilities (1,134)      
Working capital adjustment (113)      
Net cash proceeds 2,849      
Present value of receivable due on October 23, 2016 2,941      
Present value of receivable due on October 23, 2017 1,922      
Total fair value of consideration received 7,712      
Less:        
Net assets of Etherios (3,383)      
Facility abandonment costs (725)      
Transaction costs, primarily professional fees (734)      
Gain on sale of discontinued operations, before income taxes $ 2,870 $ 2,870 $ 0 $ 0