Intangible Assets and Goodwill (Tables)

9 Months Ended

Dec. 31, 2012

Goodwill and Intangible Assets Disclosure [Abstract]

Intangible Assets

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

	December 31, 2012
	Gross Amount		Accumulated Amortization			Net Amount
Developed technology	$	360,956	$	(57,159	)	$	303,797
Customer-related	194,500		(45,914		)	148,586
Trademarks and trade names	15,730		(2,763		)	12,967
Backlog	24,610		(11,835		)	12,775
In-process technology	92,386		—			92,386
Distribution rights	5,236		(5,043		)	193
Covenants not to compete	400		(300		)	100
	$	693,818	$	(123,014	)	$	570,804

	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	$41,148
2014	104,435
2015	136,790
2016	88,635
2017	57,346

Goodwill Activity

Goodwill activity for the nine months ended December 31, 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	161,063		—
Additions due to the acquisition of Roving Networks	8,652		—
Additions due to contingent consideration payments	83		—
Balance at December 31, 2012	$	244,111	$	19,200