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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)

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