Intangible Assets and Goodwill (Tables)

6 Months Ended

Sep. 30, 2012

Goodwill and Intangible Assets Disclosure [Abstract]

Intangible Assets

Intangible assets consist of the following (amounts in thousands):

	September 30, 2012
	Gross Amount		Accumulated Amortization			Net Amount
Developed technology	$	353,309	$	(46,199	)	$	307,110
Customer-related	194,500		(22,722		)	171,778
Trademarks and trade names	15,730		(1,585		)	14,145
Backlog	24,610		(6,254		)	18,356
In-process technology	95,286		—			95,286
Distribution rights	5,236		(4,917		)	319
Covenants not to compete	400		(267		)	133
	$	689,071	$	(81,944	)	$	607,127

	March 31, 2012
	Gross Amount		Accumulated Amortization			Net Amount
Developed technology	$	94,681	$	(35,920	)	$	58,761
Customer-related	20,400		(4,633		)	15,767
Trademarks and trade names	1,730		(684		)	1,046
Backlog	2,410		(2,410		)	—
In-process technology	14,086		—			14,086
Distribution rights	5,236		(4,660		)	576
Covenants not to compete	400		(200		)	200
	$	138,943	$	(48,507	)	$	90,436

Projected Amortization Expense

The following is an expected amortization schedule for the intangible assets for the remainder of fiscal year 2013 through fiscal year 2017, absent any future acquisitions or impairment charges (amounts in thousands):

Year ending March 31,	Projected Amortization Expense
2013	$82,147
2014	102,763
2015	137,477
2016	88,724
2017	56,958

Goodwill Activity

Goodwill activity for the six months ended September 30, 2012 was as follows (amounts in thousands):

	Semiconductor Products Reporting Unit		Technology Licensing Reporting Unit
Balance at March 31, 2012	$	74,313	$	19,200
Additions due to the acquisition of SMSC	157,840		—
Additions due to the acquisition of Roving Networks	8,652		—
Additions due to contingent consideration payments to previous owners of R&E International	54		—
Balance at September 30, 2012	$	240,859	$	19,200