Document and Entity Information - shares	6 Months Ended
	Jun. 27, 2020	Jul. 25, 2020
Entity Registrant Name	U. S. Premium Beef, LLC
Entity Central Index Key	0001289237
Document Type	10-Q
Document Period End Date	Jun. 27, 2020
Amendment Flag	false
Current Fiscal Year End Date	--12-26
Entity's Reporting Status Current	Yes
Entity Filer Category	Non-accelerated Filer
Document Fiscal Period Focus	Q2
Document Fiscal Year Focus	2020
Entity Emerging Growth	false
Entity Small Business	false
Entity Shell Company	false
Entity Interactive Data Current	Yes
Entity File Number	333-115164
Entity Incorporation, State Country Code	DE
Class A Units [Member]
Entity Common Stock, Shares Outstanding		735,385
Class B Units [Member]
Entity Common Stock, Shares Outstanding		755,385