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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)

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