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Segment Information (Net Sales by Product Categories) (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Net sales to unaffiliated customers and long-lived assets by geographic region
Total net sales	$ 2,221,427	$ 2,018,100	$ 2,004,908
Mobile Speakers
Net sales to unaffiliated customers and long-lived assets by geographic region
Total net sales	301,021	229,718	178,038
Audio-PC & Wearables
Net sales to unaffiliated customers and long-lived assets by geographic region
Total net sales	246,390	196,013	213,496
Gaming
Net sales to unaffiliated customers and long-lived assets by geographic region
Total net sales	314,362	245,101	211,911
Video Collaboration
Net sales to unaffiliated customers and long-lived assets by geographic region
Total net sales	127,009	89,322	62,215
Home Control
Net sales to unaffiliated customers and long-lived assets by geographic region
Total net sales	65,510	59,075	68,060
Pointing Devices
Net sales to unaffiliated customers and long-lived assets by geographic region
Total net sales	501,562	492,543	487,210
Keyboards & Combos
Net sales to unaffiliated customers and long-lived assets by geographic region
Total net sales	480,312	430,190	426,117
Tablet & Other Accessories
Net sales to unaffiliated customers and long-lived assets by geographic region
Total net sales	76,879	103,886	140,994
PC Webcams
Net sales to unaffiliated customers and long-lived assets by geographic region
Total net sales	107,087	98,641	96,680
Other
Net sales to unaffiliated customers and long-lived assets by geographic region
Total net sales	1,295	2,570	2,725
Total net retail sales
Net sales to unaffiliated customers and long-lived assets by geographic region
Total net sales	2,221,427	1,947,059	1,887,446
OEM
Net sales to unaffiliated customers and long-lived assets by geographic region
Total net sales	$ 0	$ 71,041	$ 117,462