| Cover | Nov. 07, 2019 |
| Cover [Abstract] | |
| Document Type | 8-K/A |
| Amendment Flag | true |
| Amendment Description | On November 7, 2019, NortonLifeLock Inc. (the "Company") filed a Current Report on Form 8-K to report, among other things, the appointment of Matthew Brown as the Company's interim Chief Financial Officer. On November 12, 2019, the Company filed an amendment to the aforementioned Form 8-K (Amendment No. 1) to disclose the details of Mr. Pilette's equity award, which was granted in connection with his appointment but was not determined at the time of the initial filing. The Company is filing this Form 8-K/A as an amendment (Amendment No. 2) to the aforementioned Form 8-K to disclose the details of Mr. Brown’s additional compensation, which was awarded in connection with his appointment but was not determined at the time of the previous filings. |
| Document Period End Date | Nov. 7, 2019 |
| Entity File Number | 000-17781 |
| Entity Registrant Name | NortonLifeLock Inc. |
| Entity Central Index Key | 0000849399 |
| Entity Tax Identification Number | 77-0181864 |
| Entity Incorporation, State or Country Code | DE |
| 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 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common Stock, par value $0.01 per share |
| Trading Symbol | NLOK |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
