Intangible Assets and Goodwill (Tables)

12 Months Ended

Mar. 31, 2014

Goodwill and Intangible Assets Disclosure [Abstract]

Intangible Assets

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

	March 31, 2014
	Gross Amount		Accumulated Amortization			Net Amount
Developed technology	$	402,669	$	(117,222	)	$	285,447
Customer-related	195,800		(109,170		)	86,630
Trademarks and trade names	15,730		(7,118		)	8,612
Backlog	24,610		(24,610		)	—
In-process technology	64,396		—			64,396
Distribution rights	5,585		(5,171		)	414
Covenants not to compete	400		(400		)	—
	$	709,190	$	(263,691	)	$	445,499

	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

Projected Amortization Expense

The following is an expected amortization schedule for the intangible assets for fiscal 2015 through fiscal 2019, absent any future acquisitions or impairment charges (amounts in thousands):

Year ending March 31,	Projected Amortization Expense
2015	$132,951
2016	91,711
2017	61,997
2018	46,724
2019	38,730

Goodwill Activity

Goodwill activity for fiscal years 2014 and 2013 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	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
Adjustments due to the acquisition of SMSC	(3,473		)	—
Additions due to other acquisitions	8,111			—
Additions due to contingent consideration payments	111			—
Balance at March 31, 2014	$	256,897		$	19,200