OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Revenue Recognition (Details) - USD ($) $ in Millions		9 Months Ended
Jan. 01, 2023	Oct. 01, 2023
Accounting Policies [Abstract]
Promotional program reserve	$ 46.3	$ 21.9
Promotional program reserve increase (decrease) during period	$ 32.8	$ 12.4

Promotional Program Reserve Increase (Decrease) During Period

No definition available.

Name:	utz_PromotionalProgramReserveIncreaseDecreaseDuringPeriod
Namespace Prefix:	utz_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration