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Earnings Per Unit (Tables)
6 Months Ended
Jun. 25, 2022
Earnings Per Share [Abstract]  
Schedule of Reconciliation of earnings per unit
                    
Income Per Unit Calculation  13 weeks ended   26 weeks ended 
(thousands of dollars, except unit and per unit data)  June 25, 2022   June 26, 2021   June 25, 2022   June 26, 2021 
   (unaudited)   (unaudited)   (unaudited)   (unaudited) 
Basic and diluted earnings per unit:                    
Income attributable to USPB available to unitholders (numerator)                    
Class A  $5,071   $10,233   $11,176   $13,746 
Class B  $45,643   $92,101   $100,585   $123,717 
                     
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  $6.90   $13.92   $15.20   $18.69 
Class B  $60.42   $121.93   $133.16   $163.78