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Equity-Based Compensation Plans (Tables)
 9 Months Ended 12 Months Ended
Sep. 26, 2021
Dec. 31, 2020
Summary of Share-based Compensation Arrangements by Share-based Payment Award  
The tables below summarize the PIU activity during the years ended December 31, 2020 and 2019:
 
     Outstanding
PIUs		      Weighted
Average Grant
Date Fair Value		  
December 31, 2017
      —      $ —  
Granted
      27,925        0.27  
  
 
 
     
December 31, 2018
      27,925        0.27  
Granted
      3,906        0.25  
  
 
 
     
December 31, 2019
      31,831        0.27  
Granted
      5,932        0.28  
Forfeited
      (2,193 )      0.27  
  
 
 
     
December 31, 2020
      35,570      $ 0.27  
  
 
 
     
Schedule of Components of Equity-based compensation expense
Equity-based compensation expense included the following components:
 
     For the thirteen weeks ended      For the thirty-nine weeks ended  
     September 26,
2021		      September 27,
2020		      September 26,
2021		      September 27,
2020		  
Stock options
    $ 376      $ —        $ 376      $ —    
Profit interest units
      2,110        121        2,372        356  
The following table presents the effects of equity-based compensation on the consolidated statements of comprehensive income (loss) during the periods presented:
 
     Year ended December 31,  
     2020      2019      2018  
Selling, general and administrative
    $ 487      $ 437      $ —
Schedule Of Share-Based Payment Award Stock Options Valuation using Black-Scholes option pricing model
The fair value of each stock option granted on July 16, 2021 was estimated on the grant date using the Black-Scholes option pricing model with the following assumptions:
 
Weighted-average expected term
      6.0  
Expected volatility
      40.3 % 
Expected dividend
    $ —    
Risk-free interest rate
      0.94 % 
  
Profit Interest Units [Member]    
Schedule Of Share-Based Payment Award Stock Options Valuation using Black-Scholes option pricing model  
The fair value of PIUs is estimated on the grant date with the following assumptions:
 
     Year ended
December 31,		  
     2020     2019     2018  
Weighted-average expected term
      3.4       4.1       4.8  
Expected volatility
      72.5 %     72.5 %     62.5 %
Expected dividend
      —       —       —  
Risk-free interest rate
      0.3 %     1.5 %     2.5 %