Intangible Assets and Goodwill (Tables)

12 Months Ended

Mar. 31, 2017

Goodwill and Intangible Assets Disclosure [Abstract]

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



	March 31, 2017
	Gross Amount		Accumulated Amortization			Net Amount
Core and developed technology	$	1,932,329	$	(419,468	)	$	1,512,861
Customer-related	716,945		(123,616		)	593,329
Trademarks and trade names	11,700		(9,636		)	2,064
In-process research and development	38,511		—			38,511
Distribution rights	5,578		(5,346		)	232
Other	1,449		(354		)	1,095
Total	$	2,706,512	$	(558,420	)	$	2,148,092



	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 research and development	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 fiscal 2018 through fiscal 2022, absent any future acquisitions or impairment charges (amounts in thousands):



Fiscal Year Ending March 31,	Projected Amortization Expense
2018	$490,382
2019	361,988
2020	313,288
2021	256,930
2022	189,881

Goodwill Activity

Goodwill activity for fiscal 2017 and fiscal 2016 was as follows (amounts in thousands):



	Semiconductor Products Reporting Unit			Technology Licensing Reporting Unit
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
Additions due to the acquisition of Atmel	1,286,371			—
Adjustments due to the acquisition of Micrel	(14		)	—
Balance at March 31, 2017	$	2,279,809		$	19,200