Cover - USD ($)	12 Months Ended
	Apr. 02, 2021	May 11, 2021	Oct. 02, 2020
Cover [Abstract]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Apr. 02, 2021
Current Fiscal Year End Date	--04-02
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 Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
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
ICFR Auditor Attestation Flag	true
Entity Shell Company	false
Entity Public Float			$ 6,903,176,338
Entity Common Stock, Shares Outstanding		579,944,942
Documents Incorporated by Reference	Portions of the registrant’s definitive proxy statement for the 2021 annual meeting of stockholders are incorporated herein by reference into Part III of this Annual Report on Form 10-K where indicated. Such Proxy Statement will be filed with the Securities and Exchange Commission within 120 days of the registrant’s fiscal year ended April 2, 2021.
Amendment Flag	false
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	FY
Entity Central Index Key	0000849399