Intangible Assets and Goodwill (Tables)

12 Months Ended

Mar. 31, 2013

Goodwill and Intangible Assets Disclosure [Abstract]

Intangible Assets

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

	March 31, 2013
	Gross Amount		Accumulated Amortization			Net Amount
Developed technology	$	375,006	$	(69,107	)	$	305,899
Customer-related	194,500		(68,522		)	125,978
Trademarks and trade names	15,730		(3,941		)	11,789
Backlog	24,610		(17,310		)	7,300
In-process technology	78,968		—			78,968
Distribution rights	5,236		(5,101		)	135
Covenants not to compete	400		(333		)	67
	$	694,450	$	(164,314	)	$	530,136

	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 fiscal 2014 through fiscal 2018, absent any future acquisitions or impairment charges (amounts in thousands):

Year ending March 31,	Projected Amortization Expense
2014	$100,673
2015	133,005
2016	88,223
2017	59,183
2018	44,902

Goodwill Activity

Goodwill activity for fiscal years 2013 and 2012 was as follows (amounts in thousands):

	Semiconductor Products Reporting Unit		Technology Licensing Reporting Unit
Balance at March 31, 2011	$	56,818	$	19,200
Additions due to contingent consideration payments	120		—
Additions due to the acquisition of Ident Technology AG	17,375		—
Balance at March 31, 2012	74,313		19,200
Additions due to the acquisition of SMSC	169,065		—
Additions due to the acquisition of Roving Networks	8,652		—
Additions due to contingent consideration payments	118		—
Balance at March 31, 2013	$	252,148	$	19,200