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Discontinued Operations (Video Conference Segment) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Net loss from discontinued operations $ 0 $ 0 $ (9,045)
Lifesize | Discontinued Operations, Disposed of by Sale | Video conferencing      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Net sales     65,554
Cost of goods sold     24,951
Gross profit     40,603
Marketing and selling     32,260
Research and development     16,526
General and administrative     5,254
Restructuring charges, net     7,900
Operating expenses     61,940
Operating loss from discontinued operations     (21,337)
Interest and other expense, net     (205)
Gain on divestiture of discontinued operations     13,684
Loss from discontinued operations before income taxes     (7,858)
Provision for income taxes     1,187
Net loss from discontinued operations     $ (9,045)