Intangible Assets and Goodwill (Tables)

9 Months Ended

Dec. 31, 2014

Goodwill and Intangible Assets Disclosure [Abstract]

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



	December 31, 2014
	Gross Amount		Accumulated Amortization			Net Amount
Developed technology	$	563,272	$	(185,391	)	$	377,881
Customer-related	263,969		(170,719		)	93,250
Trademarks and trade names	15,730		(8,926		)	6,804
Backlog	26,302		(25,818		)	484
In-process technology	72,442		—			72,442
Distribution rights	5,585		(5,236		)	349
Covenants not to compete	400		(400		)	—
	$	947,700	$	(396,490	)	$	551,210



	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	$48,377
2016	146,898
2017	91,833
2018	69,488
2019	62,732

Goodwill Activity

Goodwill activity for the nine months ended December 31, 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	137,178			—
Additions due to acquisition of controlling interest in ISSC	154,399			—
Adjustments due to other acquisitions	625			—
Foreign currency translation adjustments	(3,009		)	—
Balance at December 31, 2014	$	546,090		$	19,200