GEOGRAPHIC INFORMATION (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended									12 Months Ended
	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012		Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2014 Customer	Mar. 31, 2013 Customer	Mar. 31, 2012 Customer
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues	$ 209,070	$ 212,739	$ 193,980	$ 202,818	$ 204,179	$ 197,402	[1]	$ 179,280	$ 181,365	$ 818,607	$ 762,226	$ 713,368
Number of customers representing 10% or more or Net Revenue										0	0	0
Long-Lived Assets	134,402				99,111					134,402	99,111
U.S.
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues										475,278	436,447	406,233
Long-Lived Assets	74,092				62,263					74,092	62,263
Europe and Africa
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues										195,385	181,439	177,157
Asia Pacific
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues										94,455	92,193	78,853
Americas, excluding U.S.
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues										53,489	52,147	51,125
Mexico
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-Lived Assets	38,453				24,033					38,453	24,033
Other countries
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-Lived Assets	21,857				12,815					21,857	12,815
International
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues										343,329	325,779	307,135
Office and Contact Center
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues										588,265	549,301	531,709
Mobile
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues										186,206	163,460	131,825
Gaming and Computer Audio
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues										29,674	30,747	31,855
Clarity
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues										$ 14,462	$ 18,718	$ 17,979

[1] We initiated a restructuring plan during the third quarter of fiscal year 2013. Under the plan, we eliminated certain positions in the US., Mexico, China, and Europe, and transitioned some of these positions to lower cost locations. The pre-tax charges incurred during fiscal year 2013 included $1.9 million for severance and related benefits and an immaterial amount of accelerated amortization on leasehold assets with no alternative future use.