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Equity Agreements and Incentive Equity Plans - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 24, 2021
Sep. 25, 2020
Sep. 24, 2021
Sep. 25, 2020
Dec. 25, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number rights converted (in shares) 2,998   2,998    
Unrecognized compensation expense $ 39,032   $ 39,032    
Weighted average expense period     2 years 5 months 8 days    
B-1 Incentive Units          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period     5 years    
Share-based compensation expense $ 367 $ 1,025      
Units granted (in shares)     4,243,000    
Granted (in dollars per share)     $ 18.00    
Granted (in shares)     833,000    
Units forfeited (in shares)     4,000    
Forfeited (in dollars per share)     $ 18.00    
Vested (in shares)     0    
Vested (in dollars per share)     $ 0    
Nonvested awards (in shares) 829,000   829,000   0
B-2 Incentive Units          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Units granted (in shares)     1,155,000    
Granted (in dollars per share)     $ 18.00    
Granted (in shares)     807,000    
Units forfeited (in shares)     0    
Forfeited (in dollars per share)     $ 0    
Vested (in shares)     0    
Vested (in dollars per share)     $ 0    
Nonvested awards (in shares) 807,000   807,000   0
Market-based options          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period     10 years    
Time-based Options          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period     3 years    
Units granted (in shares)     4,443,000    
Restricted stock units          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Granted (in dollars per share) $ 18.07   $ 18.00    
Granted (in shares) 391,000        
Grant date fair value $ 7,058        
Units forfeited (in shares) 7,000        
Forfeited (in dollars per share) $ 18.00        
Vested (in shares) 0        
Outstanding awards (in shares) 384,000   384,000    
Vested (in dollars per share) $ 18.07        
Restricted stock units | Minimum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period     1 year    
Restricted stock units | Maximum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period     4 years    
Replacement Award          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based compensation expense $ 890 $ 1,538 $ 3,434 $ 6,606  
Units forfeited (in shares) 1        
Vested (in shares)     0    
Nonvested awards (in shares) 83   83    
Unrecognized compensation expense $ 1,560   $ 1,560    
Weighted average expense period     1 year