Intangible Assets and Goodwill (Tables)

6 Months Ended

Sep. 30, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of intangible assets

Intangible assets consist of the following (in millions):

	September 30, 2018
	Gross Amount		Accumulated Amortization			Net Amount
Core and developed technology	$	6,266.4	$	(844.9	)	$	5,421.5
Customer-related	1,043.9		(464.0		)	579.9
Backlog	27.9		(11.2		)	16.7
In-process research and development	801.9		—			801.9
Distribution rights	0.4		(0.2		)	0.2
Other	7.2		(1.5		)	5.7
Total	$	8,147.7	$	(1,321.8	)	$	6,825.9

	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

Schedule of projected amortization expense

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

Fiscal Year Ending March 31,	Projected Amortization Expense
2019	$393.9
2020	$991.9
2021	$926.6
2022	$852.0
2023	$660.4

Schedule of goodwill activity

Goodwill activity for the three and six months ended September 30, 2018 was as follows (in millions):

	Semiconductor Products Reporting Unit		Technology Licensing Reporting Unit
Balance at March 31, 2018	$	2,279.8	$	19.2
Additions due to the acquisition of Microsemi	4,488.5		—
Balance at September 30, 2018	$	6,768.3	$	19.2