Intangible Assets and Goodwill (Tables)

12 Months Ended

Mar. 31, 2019

Goodwill and Intangible Assets Disclosure [Abstract]

Intangible Assets

Intangible assets consist of the following (in millions):

	March 31, 2019
	Gross Amount		Accumulated Amortization			Net Amount
Core and developed technology	$	7,413.0	$	(1,112.9	)	$	6,300.1
Customer-related	917.1		(544.0		)	373.1
In-process research and development	7.7		—			7.7
Distribution rights	0.3		(0.2		)	0.1
Other	7.3		(2.7		)	4.6
Total	$	8,345.4	$	(1,659.8	)	$	6,685.6

	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

Projected Amortization Expense

The following is an expected amortization schedule for the intangible assets for fiscal 2020 through fiscal 2024, absent any future acquisitions or impairment charges (in millions):

Fiscal Year Ending March 31,	Projected Amortization Expense
2020	$1,005.8
2021	$944.1
2022	$873.1
2023	$680.0
2024	$608.3

Goodwill Activity

Goodwill activity for fiscal 2019 and fiscal 2018 was as follows (in millions):

	Semiconductor Products Reporting Unit		Technology Licensing Reporting Unit
Balance at March 31, 2017 and 2018	$	2,279.8	$	19.2
Additions due to the acquisition of Microsemi	4,364.9		—
Balance at March 31, 2019	$	6,644.7	$	19.2