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Discontinued Operations (Details) - Computer Systems Segment - NewNet Communication Technologies, LLC - USD ($)
$ in Millions
Dec. 01, 2014
Apr. 30, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Note receivable $ 10.0  
Interest rate 0.50%  
Payment term 4 years  
Capital interest percentage 20.00%  
Notes receivable, fair value $ 8.4  
Unamortized discount   $ 1.1