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Cover - USD ($)
 12 Months Ended
Apr. 03, 2020
May 12, 2020
Oct. 04, 2019
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Apr. 03, 2020    
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    
Entity Shell Company false    
Entity Public Float     $ 8,798,715,226
Entity Common Stock, Shares Outstanding   589,028,713  
Documents Incorporated by Reference
Portions of the registrant’s definitive proxy statement for the 2020 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 3, 2020.
 

    
Document Fiscal Year Focus 2020    
Document Fiscal Period Focus FY    
Entity Central Index Key 0000849399    
Current Fiscal Year End Date --04-03    
Amendment Flag false