GEOGRAPHIC INFORMATION (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended									12 Months Ended
	Mar. 31, 2013	Dec. 31, 2012		Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2013 Customer	Mar. 31, 2012 Customer	Mar. 31, 2011 Customer
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues from unaffiliated customers										$ 762,226	$ 713,368	$ 683,602
Net revenues from unaffiliated customers, international										325,779	307,135	283,310
Net revenues	204,179	197,402	[1]	179,280	181,365	177,584	183,236	176,948	175,600	762,226	713,368	683,602
Number of Major Customers, Ten Percent Or Greater, Net Revenues										0	0	0
Total long-Lived Assets	99,111					76,159				99,111	76,159
U.S.
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues from unaffiliated customers, U.S.										436,447	406,233	400,292
Long-Lived Assets in U.S.	62,263					56,420				62,263	56,420
Europe and Africa
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues from unaffiliated customers, international										181,439	177,157	165,800
Asia Pacific
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues from unaffiliated customers, international										92,193	78,853	66,419
Americas, excluding U.S.
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues from unaffiliated customers, international										52,147	51,125	51,091
Mexico
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-Lived Assets in Foreign Countries	24,033					6,728				24,033	6,728
Other countries
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-Lived Assets in Foreign Countries	12,815					13,011				12,815	13,011
Office and Contact Center
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues from unaffiliated customers										549,301	531,709	490,472
Mobile
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues from unaffiliated customers										163,460	131,825	137,530
Gaming and Computer Audio
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues from unaffiliated customers										30,747	31,855	36,736
Clarity
Revenues from External Customers and Long-Lived Assets [Line Items]
Net revenues from unaffiliated customers										$ 18,718	$ 17,979	$ 18,864

[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.