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Discontinued Operations (Video Conference Segment) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Impairment of goodwill $ 0 $ 0 $ 122,734
Net loss from discontinued operations $ 0 (9,045) (139,146)
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   65,554 109,039
Cost of goods sold   24,951 40,299
Gross profit   40,603 68,740
Marketing and selling   32,260 56,856
Research and development   16,526 22,706
General and administrative   5,254 5,439
Impairment of goodwill   0 122,734
Restructuring charges (credits), net   7,900 (111)
Operating expenses   61,940 207,624
Operating loss from discontinued operations   (21,337) (138,884)
Interest and other expense, net   205 426
Gain on disposal of discontinued operations   13,684 0
Loss from discontinued operations before income taxes   (7,858) (139,310)
Provision for (benefit from) income taxes   1,187 (164)
Net loss from discontinued operations   $ (9,045) $ (139,146)