Intangible Assets and Goodwill (Tables)

6 Months Ended

Sep. 30, 2016

Goodwill and Intangible Assets Disclosure [Abstract]

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



	September 30, 2016
	Gross Amount		Accumulated Amortization			Net Amount
Core and developed technology	$	1,813,689	$	(347,137	)	$	1,466,552
Customer-related	909,141		(258,151		)	650,990
Trademarks and trade names	11,700		(8,604		)	3,096
Backlog	28,300		(14,150		)	14,150
In-process technology	186,067		—			186,067
Distribution rights	5,580		(5,324		)	256
Other	1,805		(210		)	1,595
Total	$	2,956,282	$	(633,576	)	$	2,322,706



	March 31, 2016
	Gross Amount		Accumulated Amortization			Net Amount
Core and developed technology	$	724,883	$	(255,460	)	$	469,423
Customer-related	278,542		(200,331		)	78,211
Trademarks and trade names	11,700		(7,571		)	4,129
In-process technology	54,308		—			54,308
Distribution rights	5,580		(5,302		)	278
Total	$	1,075,013	$	(468,664	)	$	606,349

Projected Amortization Expense

The following is an expected amortization schedule for the intangible assets for the remainder of fiscal 2017 through fiscal 2021, absent any future acquisitions or impairment charges (amounts in thousands):



Year ending March 31,	Projected Amortization Expense
2017	$170,507
2018	492,584
2019	364,138
2020	314,558
2021	257,223

Goodwill Activity

Goodwill activity for the six months ended September 30, 2016 was as follows (amounts in thousands):



	Semiconductor Products Reporting Unit			Technology Licensing Reporting Unit
Balance at March 31, 2016	$	993,452		$	19,200
Additions due to the acquisition of Atmel	1,372,102			—
Adjustments due to the acquisition of Micrel	(14		)	—
Balance at September 30, 2016	$	2,365,540		$	19,200