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Segment Information (Net Sales by Product Categories) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2018
Net sales to unaffiliated customers and long-lived assets by geographic region |  |  |
Total net sales | $ 2,975,851 | $ 2,788,322 | $ 2,566,863
Pointing Devices |  |  |
Net sales to unaffiliated customers and long-lived assets by geographic region |  |  |
Total net sales | 544,519 | 536,890 | 516,637
Keyboards & Combos |  |  |
Net sales to unaffiliated customers and long-lived assets by geographic region |  |  |
Total net sales | 571,720 | 536,619 | 498,472
PC Webcams |  |  |
Net sales to unaffiliated customers and long-lived assets by geographic region |  |  |
Total net sales | 129,193 | 121,282 | 112,147
Tablet & Other Accessories |  |  |
Net sales to unaffiliated customers and long-lived assets by geographic region |  |  |
Total net sales | 135,309 | 128,315 | 107,942
Video Collaboration |  |  |
Net sales to unaffiliated customers and long-lived assets by geographic region |  |  |
Total net sales | 365,616 | 259,521 | 182,717
Mobile Speakers |  |  |
Net sales to unaffiliated customers and long-lived assets by geographic region |  |  |
Total net sales | 221,791 | 230,378 | 314,817
Audio & Wearables |  |  |
Net sales to unaffiliated customers and long-lived assets by geographic region |  |  |
Total net sales | 273,752 | 277,429 | 252,330
Gaming |  |  |
Net sales to unaffiliated customers and long-lived assets by geographic region |  |  |
Total net sales | 690,174 | 648,130 | 491,995
Smart Home |  |  |
Net sales to unaffiliated customers and long-lived assets by geographic region |  |  |
Total net sales | 43,404 | 49,344 | 89,373
Other |  |  |
Net sales to unaffiliated customers and long-lived assets by geographic region |  |  |
Total net sales | $ 373 | $ 414 | $ 433

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