REVENUE AND MAJOR CUSTOMERS (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Mar. 31, 2012
Revenue from External Customer [Line Items]
Net revenues, international	$ 71,767	$ 75,752	$ 149,054	$ 151,061
Net revenues	179,280	176,948	360,645	352,548
Number of Major Customers, Ten Percent Or Greater, Net Revenues	1	0	0	0
Number of Major Customers, Ten Percent Or Greater, Net Accounts Receivable	0		0		0
U.S. [Member]
Revenue from External Customer [Line Items]
Net revenues, U.S.	107,513	101,196	211,591	201,487
Europe and Africa [Member]
Revenue from External Customer [Line Items]
Net revenues, international	38,951	42,383	80,527	84,523
Asia Pacific [Member]
Revenue from External Customer [Line Items]
Net revenues, international	19,839	21,206	43,418	41,464
Americas, excluding U.S. [Member]
Revenue from External Customer [Line Items]
Net revenues, international	12,977	12,163	25,109	25,074
Office and Contact Center [Member]
Revenue from External Customer [Line Items]
Net revenues	133,119	136,395	267,152	267,394
Mobile [Member]
Revenue from External Customer [Line Items]
Net revenues	33,305	28,341	69,462	60,505
Gaming and Computer Audio [Member]
Revenue from External Customer [Line Items]
Net revenues	7,797	8,381	14,586	15,776
Clarity [Member]
Revenue from External Customer [Line Items]
Net revenues	$ 5,059	$ 3,831	$ 9,445	$ 8,873