v3.26.1
Loss Per Unit (Tables)
6 Months Ended
Jun. 27, 2026
Earnings Per Share [Abstract]  
Schedule of income per unit calculation
                    
Net Loss Per Unit Calculation  13-weeks ended  26-weeks ended
(thousands of dollars, except unit and per unit data)  June 27, 2026  June 28, 2025  June 27, 2026  June 28, 2025
   (unaudited)  (unaudited)  (unaudited)  (unaudited)
Basic and diluted loss per unit:                    
Loss attributable to USPB available to members (numerator)                    
Class A  $(525)  $(474)  $(1,224)  $(1,533)
Class B  $(4,722)  $(4,268)  $(11,016)  $(13,793)
                     
Weighted average outstanding units (denominator)                    
Class A   735,385    735,385    735,385    735,385 
Class B   755,385    755,385    755,385    755,385 
                     
Per unit amount                    
Class A  $(0.71)  $(0.64)  $(1.66)  $(2.08)
Class B  $(6.25)  $(5.65)  $(14.58)  $(18.26)