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Segment Information (Net Sales by Product Categories) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2017
Net sales to unaffiliated customers and long-lived assets by geographic region |  |  |
Total net sales | $ 2,788,322 | $ 2,566,863 | $ 2,221,427
Pointing Devices |  |  |
Net sales to unaffiliated customers and long-lived assets by geographic region |  |  |
Total net sales | 536,890 | 516,637 | 501,562
Keyboards & Combos |  |  |
Net sales to unaffiliated customers and long-lived assets by geographic region |  |  |
Total net sales | 536,619 | 498,472 | 480,312
PC Webcams |  |  |
Net sales to unaffiliated customers and long-lived assets by geographic region |  |  |
Total net sales | 121,282 | 112,147 | 107,087
Tablet & Other Accessories |  |  |
Net sales to unaffiliated customers and long-lived assets by geographic region |  |  |
Total net sales | 128,315 | 107,942 | 76,879
Video Collaboration |  |  |
Net sales to unaffiliated customers and long-lived assets by geographic region |  |  |
Total net sales | 259,521 | 182,717 | 127,009
Mobile Speakers |  |  |
Net sales to unaffiliated customers and long-lived assets by geographic region |  |  |
Total net sales | 230,378 | 314,817 | 301,021
Audio & Wearables |  |  |
Net sales to unaffiliated customers and long-lived assets by geographic region |  |  |
Total net sales | 277,429 | 252,330 | 246,390
Gaming |  |  |
Net sales to unaffiliated customers and long-lived assets by geographic region |  |  |
Total net sales | 648,130 | 491,995 | 314,362
Smart Home |  |  |
Net sales to unaffiliated customers and long-lived assets by geographic region |  |  |
Total net sales | 49,344 | 89,373 | 65,510
Other |  |  |
Net sales to unaffiliated customers and long-lived assets by geographic region |  |  |
Total net sales | $ 414 | $ 433 | $ 1,295

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