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Segment Information (Net Sales by Product Categories) (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Net sales to unaffiliated customers and long-lived assets by geographic region
Total net sales	$ 2,566,863	$ 2,221,427	$ 2,018,100
Mobile Speakers
Net sales to unaffiliated customers and long-lived assets by geographic region
Total net sales	314,817	301,021	229,718
Audio-PC & Wearables
Net sales to unaffiliated customers and long-lived assets by geographic region
Total net sales	252,330	246,390	196,013
Gaming
Net sales to unaffiliated customers and long-lived assets by geographic region
Total net sales	491,995	314,362	245,101
Video Collaboration
Net sales to unaffiliated customers and long-lived assets by geographic region
Total net sales	182,717	127,009	89,322
Smart Home
Net sales to unaffiliated customers and long-lived assets by geographic region
Total net sales	89,373	65,510	59,075
Pointing Devices
Net sales to unaffiliated customers and long-lived assets by geographic region
Total net sales	516,637	501,562	492,543
Keyboards & Combos
Net sales to unaffiliated customers and long-lived assets by geographic region
Total net sales	498,472	480,312	430,190
Tablet & Other Accessories
Net sales to unaffiliated customers and long-lived assets by geographic region
Total net sales	107,942	76,879	103,886
PC Webcams
Net sales to unaffiliated customers and long-lived assets by geographic region
Total net sales	112,147	107,087	98,641
Other
Net sales to unaffiliated customers and long-lived assets by geographic region
Total net sales	433	1,295	2,570
Total Net Retail Sales
Net sales to unaffiliated customers and long-lived assets by geographic region
Total net sales	2,566,863	2,221,427	1,947,059
OEM
Net sales to unaffiliated customers and long-lived assets by geographic region
Total net sales	$ 0	$ 0	$ 71,041