| Document and Entity Information - USD ($) $ in Millions | 12 Months Ended | ||
| Jan. 02, 2021 | Feb. 26, 2021 | Jun. 27, 2020 | |
| Cover [Abstract] | |||
| Document Type | 10-K/A | ||
| Document Annual Report | true | ||
| Document Period End Date | Jan. 2, 2021 | ||
| Current Fiscal Year End Date | --01-02 | ||
| Document Transition Report | false | ||
| Entity File Number | 001-38854 | ||
| Entity Registrant Name | KONTOOR BRANDS, INC. | ||
| Entity Incorporation, State or Country Code | NC | ||
| Entity Tax Identification Number | 83-2680248 | ||
| Entity Address, Address Line One | 400 N. Elm Street | ||
| Entity Address, City or Town | Greensboro | ||
| Entity Address, State or Province | NC | ||
| Entity Address, Postal Zip Code | 27401 | ||
| City Area Code | 336 | ||
| Local Phone Number | 332-3400 | ||
| Title of 12(b) Security | Common Stock, no par value | ||
| Entity Trading Symbol | KTB | ||
| Security Exchange Name | NYSE | ||
| Entity Well-known Seasoned Issuer | Yes | ||
| 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 | $ 940 | ||
| Entity Common Stock, Shares Outstanding | 57,372,046 | ||
| Entity Central Index Key | 0001760965 | ||
| Document Fiscal Year Focus | 2020 | ||
| Document Fiscal Period Focus | FY | ||
| Amendment Flag | false |
