Intangible Assets and Goodwill (Tables)

12 Months Ended

Mar. 31, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

Intangible Assets

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

	March 31, 2018
	Gross Amount		Accumulated Amortization			Net Amount
Core and developed technology	$	1,952.3	$	(644.4	)	$	1,307.9
Customer-related	716.9		(375.9		)	341.0
In-process research and development	12.1		—			12.1
Distribution rights	0.3		(0.1		)	0.2
Other	1.5		(0.7		)	0.8
Total	$	2,683.1	$	(1,021.1	)	$	1,662.0

	March 31, 2017
	Gross Amount		Accumulated Amortization			Net Amount
Core and developed technology	$	1,932.3	$	(419.5	)	$	1,512.8
Customer-related	716.9		(123.6		)	593.3
Trademarks and trade names	11.7		(9.6		)	2.1
In-process research and development	38.5		—			38.5
Distribution rights	5.6		(5.3		)	0.3
Other	1.5		(0.4		)	1.1
Total	$	2,706.5	$	(558.4	)	$	2,148.1

Projected Amortization Expense

The following is an expected amortization schedule for the intangible assets for fiscal 2019 through fiscal 2023, absent any future acquisitions or impairment charges (amounts in millions):

Fiscal Year Ending March 31,	Projected Amortization Expense
2019	$362.8
2020	314.6
2021	259.3
2022	192.5
2023	143.7

Goodwill Activity

Goodwill activity for fiscal 2018 and fiscal 2017 was as follows (amounts in millions):

	Semiconductor Products Reporting Unit		Technology Licensing Reporting Unit
Balance at March 31, 2016	$	993.5	$	19.2
Additions due to the acquisition of Atmel	1,286.3		—
Balance at March 31, 2017	2,279.8		19.2
Balance at March 31, 2018	$	2,279.8	$	19.2