GOODWILL AND INTANGIBLE ASSETS (Tables)

6 Months Ended

Sep. 30, 2012

Purchased Intangible Assets

Our purchased intangible assets as of the dates indicated below were as follows (in thousands):

	September 30, 2012							April 1, 2012
	Carrying Amount		Accumulated Amortization			Net Carrying Amount		Carrying Amount		Accumulated Amortization			Net Carrying Amount
Existing technology	$	35,271	$	(28,991	)	$	6,280	$	34,848	$	(27,286	)	$	7,562
Patents/Core technology		3,459		(3,084	)		375		3,736		(2,855	)		881
Distributor relationships		1,264		(1,169	)		95		1,264		(1,119	)		145
Customer relationships		2,905		(1,915	)		990		2,905		(1,751	)		1,154
Tradenames/Trademarks		1,025		(1,025	)		—		1,025		(1,012	)		13
Total	$	43,924	$	(36,184	)	$	7,740	$	43,778	$	(34,023	)	$	9,755

Aggregate Amortization Expenses for Our Purchased Intangible Assets

The aggregate amortization expenses for our purchased intangible assets for the periods indicated below were as follows (in thousands):

	Three Months Ended				Six Months Ended
	September  30, 2012		October  2, 2011		September  30, 2012		October  2, 2011
Amortization expense	$	1,048	$	1,279	$	2,161	$	2,530

Estimated Future Amortization Expenses for Our Purchased Intangible Assets

The estimated future amortization expenses for our purchased intangible assets are summarized below (in thousands):

Amortization Expense (by fiscal year)
2013 (6 months remaining)	$	1,984
2014		3,530
2015		1,304
2016		713
2017		185
Thereafter		24
Total estimated amortization	$	7,740