| Cover Page | Mar. 18, 2021 | Feb. 04, 2021 | Dec. 10, 2020 |
| Document Information [Line Items] | |||
| Document Type | 8-K | ||
| Document Period End Date | Mar. 18, 2021 | ||
| Entity Registrant Name | Utz Brands, Inc. | ||
| Entity Incorporation, State or Country Code | DE | ||
| Entity File Number | 001-38686 | ||
| Entity Tax Identification Number | 85-2751850 | ||
| 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 | ||
| Entity Emerging Growth Company | true | ||
| Entity Ex Transition Period | false | ||
| Entity Central Index Key | 0001739566 | ||
| Amendment Flag | false | ||
| Former Address | |||
| Document Information [Line Items] | |||
| Entity Registrant Name | N/A |
