| Cover | Jan. 20, 2021 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Jan. 20, 2021 |
| Entity File Number | 001-38686 |
| Entity Registrant Name | Utz Brands, Inc. |
| Entity Central Index Key | 0001739566 |
| Entity Tax Identification Number | 85-2751850 |
| Entity Incorporation, State or Country Code | DE |
| Entity Address, Address Line One | 900 High Street |
| Entity Address, City or Town | Hanover |
| Entity Address, State or Province | PA |
| Entity Address, Postal Zip Code | 17331 |
| City Area Code | 717 |
| Local Phone Number | 637-6644 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Class A Common Stock, par value $0.0001 per share |
| Trading Symbol | UTZ |
| Security Exchange Name | NYSE |
| Entity Emerging Growth Company | true |
| Elected Not To Use the Extended Transition Period | false |
