Cover Page - shares	6 Months Ended
	Oct. 01, 2021	Oct. 28, 2021
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Oct. 01, 2021
Document Transition Report	false
Entity File Number	000-17781
Entity Registrant Name	NortonLifeLock Inc.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	77-0181864
Entity Address, Address Line One	60 E. Rio Salado Parkway,
Entity Address, Address Line Two	Suite 1000,
Entity Address, City or Town	Tempe,
Entity Address, State or Province	AZ
Entity Address, Postal Zip Code	85281
City Area Code	650
Local Phone Number	527-8000
Title of 12(b) Security	Common Stock,
Trading Symbol	NLOK
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		581,755,019
Amendment Flag	false
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	Q2
Entity Central Index Key	0000849399
Current Fiscal Year End Date	--04-01