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5. Earnings Per Unit (Tables)
6 Months Ended
Jun. 27, 2020
Earnings Per Share [Abstract]  
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 27, 2020     June 29, 2019     June 27, 2020     June 29, 2019
  (unaudited)     (unaudited)     (unaudited)     (unaudited)
Basic and diluted earnings per unit:                      
Income attributable to USPB available to                      
   unitholders (numerator)                      
      Class A $ 10,120   $ 2,475   $ 11,338   $ 3,529
      Class B $ 91,084   $ 22,273   $ 102,042   $ 31,757
                       
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 $ 13.76   $ 3.37   $ 15.42   $ 4.80
   Class B $ 120.58   $ 29.49   $ 135.09   $ 42.04