v3.25.2
Loss/Income Per Unit (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 28, 2025
Jun. 29, 2024
Jun. 28, 2025
Jun. 29, 2024
Class A Units [Member]        
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]        
(Loss) income attributable to USPB available to members (numerator) $ (474) $ 528 $ (1,533) $ 459
Weighted average outstanding units, Basic 735,385 735,385 735,385 735,385
Weighted average outstanding units, Diluted 735,385 735,385 735,385 735,385
Income per unit, Basic $ (0.64) $ 0.72 $ (2.08) $ 0.62
Income per unit, Diluted $ (0.64) $ 0.72 $ (2.08) $ 0.62
Class B Units [Member]        
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]        
(Loss) income attributable to USPB available to members (numerator) $ (4,268) $ 4,750 $ (13,793)  
(Loss) income attributable to USPB available to members (numerator)       $ 4,128
Weighted average outstanding units, Basic 755,385 755,385 755,385 755,385
Weighted average outstanding units, Diluted 755,385 755,385 755,385 755,385
Income per unit, Basic $ (5.65) $ 6.29 $ (18.26) $ 5.47
Income per unit, Diluted $ (5.65) $ 6.29 $ (18.26) $ 5.47