Intangible Assets and Goodwill (Tables)

12 Months Ended

Mar. 31, 2021

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Intangible Assets, Indefinite-Lived

Intangible assets consist of the following (in millions):

	March 31, 2021
	Gross Amount		Accumulated Amortization		Net Amount
Core and developed technology	$	7,371.3	$	(2,771.0)	$	4,600.3
Customer-related	835.2		(702.6)		132.6
In-process research and development	7.7		—		7.7
Distribution rights and other	130.2		(76.0)		54.2
Total	$	8,344.4	$	(3,549.6)	$	4,794.8

	March 31, 2020
	Gross Amount		Accumulated Amortization		Net Amount
Core and developed technology	$	7,331.9	$	(1,924.6)	$	5,407.3
Customer-related	903.6		(674.7)		228.9
In-process research and development	8.8		—		8.8
Distribution rights and other	126.0		(68.7)		57.3
Total	$	8,370.3	$	(2,668.0)	$	5,702.3

Schedule of Intangible Assets, Finite-Lived

Intangible assets consist of the following (in millions):

	March 31, 2021
	Gross Amount		Accumulated Amortization		Net Amount
Core and developed technology	$	7,371.3	$	(2,771.0)	$	4,600.3
Customer-related	835.2		(702.6)		132.6
In-process research and development	7.7		—		7.7
Distribution rights and other	130.2		(76.0)		54.2
Total	$	8,344.4	$	(3,549.6)	$	4,794.8

	March 31, 2020
	Gross Amount		Accumulated Amortization		Net Amount
Core and developed technology	$	7,331.9	$	(1,924.6)	$	5,407.3
Customer-related	903.6		(674.7)		228.9
In-process research and development	8.8		—		8.8
Distribution rights and other	126.0		(68.7)		57.3
Total	$	8,370.3	$	(2,668.0)	$	5,702.3

Schedule of Projected Amortization Expense

The following is an expected amortization schedule for the intangible assets for fiscal 2022 through fiscal 2026, absent any future acquisitions or impairment charges (in millions):

Fiscal Year Ending March 31,	Projected Amortization Expense
2022	$	912.0
2023	$	707.2
2024	$	627.7
2025	$	508.1
2026	$	445.3

Schedule of Amortization Expense by Intangible Asset Class

Amortization expense attributed to intangible assets are assigned to cost of sales and operating expenses as follows (in millions):

	Fiscal Year Ended March 31,
	2021		2020		2019
Amortization expense charged to cost of sales	$	9.4	$	8.9	$	9.6
Amortization expense charged to operating expense	983.3		1,037.8		686.2
Total amortization expense	$	992.7	$	1,046.7	$	695.8

Schedule of Goodwill Activity

Goodwill activity by segment was as follows (in millions):

	Semiconductor Products Reporting Unit		Technology Licensing Reporting Unit
Balance at March 31, 2019	$	6,644.7	$	19.2
Additions	0.9		—
Balance at March 31, 2020	6,645.6		19.2
Additions	5.8		—
Balance at March 31, 2021	$	6,651.4	$	19.2