Intangible Assets and Goodwill (Tables)

6 Months Ended

Sep. 30, 2014

Goodwill and Intangible Assets Disclosure [Abstract]

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



	September 30, 2014
	Gross Amount		Accumulated Amortization			Net Amount
Developed technology	$	559,828	$	(161,145	)	$	398,683
Customer-related	263,805		(147,489		)	116,316
Trademarks and trade names	15,730		(8,323		)	7,407
Backlog	26,302		(25,331		)	971
In-process technology	75,280		—			75,280
Distribution rights	5,585		(5,217		)	368
Covenants not to compete	400		(400		)	—
	$	946,930	$	(347,905	)	$	599,025



	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

Projected Amortization Expense

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



Year ending March 31,	Projected Amortization Expense
2015	$99,063
2016	150,298
2017	92,227
2018	73,926
2019	65,650

Goodwill Activity

Goodwill activity for the six months ended September 30, 2014 was as follows (amounts in thousands):



	Semiconductor Products Reporting Unit			Technology Licensing Reporting Unit
Balance at March 31, 2014	$	256,897		$	19,200
Additions due to the acquisition of Supertex	132,508			—
Additions due to acquisition of controlling interest in ISSC	152,243			—
Adjustments due to other acquisitions	625			—
Foreign currency translation adjustments	(3,508		)	—
Balance at September 30, 2014	$	538,765		$	19,200