REVENUE AND MAJOR CUSTOMERS (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Sep. 30, 2013 Customer	Sep. 30, 2012 Customer	Sep. 30, 2013 Customer	Sep. 30, 2012 Customer	Mar. 31, 2013 Customer
Revenue from External Customer [Line Items]
Total net revenues	$ 193,980	$ 179,280	$ 396,798	$ 360,645
Number of Major Customers, Ten Percent Or Greater, Net Revenues	1	1	1	0
Number of Major Customers, Ten Percent Or Greater, Net Accounts Receivable	1		1		1
Concentration, net revenues	10.10%	10.00%	10.30%
Concentration, accounts receivable	11.70%		11.70%		10.30%
US
Revenue from External Customer [Line Items]
Net revenues	115,795	107,513	237,113	211,591
Europe and Africa [Member]
Revenue from External Customer [Line Items]
Net revenues	43,094	38,951	87,479	80,527
Asia Pacific [Member]
Revenue from External Customer [Line Items]
Net revenues	23,280	19,839	47,160	43,418
Americas, excluding U.S. [Member]
Revenue from External Customer [Line Items]
Net revenues	11,811	12,977	25,046	25,109
Total international net revenues
Revenue from External Customer [Line Items]
Net revenues	78,185	71,767	159,685	149,054
Office and Contact Center [Member]
Revenue from External Customer [Line Items]
Net revenues	139,945	133,119	291,128	267,152
Mobile [Member]
Revenue from External Customer [Line Items]
Net revenues	42,685	33,305	84,309	69,462
Gaming and Computer Audio [Member]
Revenue from External Customer [Line Items]
Net revenues	8,156	7,797	14,607	14,586
Clarity [Member]
Revenue from External Customer [Line Items]
Net revenues	$ 3,194	$ 5,059	$ 6,754	$ 9,445