Intangible Assets and Goodwill (Tables)

12 Months Ended

Mar. 31, 2016

Goodwill and Intangible Assets Disclosure [Abstract]

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



	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



	March 31, 2015
	Gross Amount		Accumulated Amortization			Net Amount
Core and developed technology	$	549,415	$	(189,149	)	$	360,266
Customer-related	262,769		(192,283		)	70,486
Trademarks and trade names	13,180		(6,979		)	6,201
In-process technology	67,142		—			67,142
Distribution rights	5,580		(5,258		)	322
Total	$	898,086	$	(393,669	)	$	504,417

Projected Amortization Expense

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



Year ending March 31,	Projected Amortization Expense
2017	$137,321
2018	110,811
2019	94,573
2020	76,683
2021	50,974

Goodwill Activity

Goodwill activity for fiscal years 2016 and 2015 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	143,160			—
Additions due to acquisition of controlling interest in ISSC	154,399			—
Adjustments due to other acquisitions	624			—
Foreign currency translation adjustments	(3,009		)	—
Balance at March 31, 2015	552,071			19,200
Additions due to the acquisition of Micrel	440,992			—
Adjustments due to the acquisition of ISSC	389			—
Balance at March 31, 2016	$	993,452		$	19,200