Annual report pursuant to Section 13 and 15(d)

Stockholders' Equity - Restricted Stock Award Activity (Details)

v3.20.4
Stockholders' Equity - Restricted Stock Award Activity (Details) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 26, 2019
Dec. 27, 2018
Restricted Stock Awards      
Weighted Average Grant Date Fair Value      
Unrecognized compensation cost amount $ 15,200,000 $ 1,100,000  
Unrecognized compensation cost period for recognition (in years) 2 years 7 months 6 days    
Fair value of restricted stock awards vested $ 500,000 $ 500,000 $ 0
Service-based      
Restricted Stock Awards      
Beginning balance (in shares) 37,032    
Granted (in shares) 103,767    
Vested (in shares) (8,955)    
Forfeited (in shares) 0    
Ending balance (in shares) 131,844 37,032  
Weighted Average Grant Date Fair Value      
Beginning balance (in dollars per share) $ 35.78    
Granted (in dollars per share) 57.84    
Vested (in dollars per share) 27.23    
Forfeited (in dollars per share) 0    
Ending balance (in dollars per share) $ 53.72 $ 35.78  
Performance-based      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period (in years) 3 years    
Restricted Stock Awards      
Beginning balance (in shares) 0    
Granted (in shares) 160,315    
Vested (in shares) 0    
Forfeited (in shares) 0    
Ending balance (in shares) 160,315 0  
Weighted Average Grant Date Fair Value      
Beginning balance (in dollars per share) $ 0    
Granted (in dollars per share) 57.70    
Vested (in dollars per share) 0    
Forfeited (in dollars per share) 0    
Ending balance (in dollars per share) $ 57.70 $ 0  
Performance-based | Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Grantee's continued service through the vesting date period (in years) 3 years    
Performance-based | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Grantee's continued service through the vesting date period (in years) 4 years    
TSR      
Restricted Stock Awards      
Beginning balance (in shares) 0    
Granted (in shares) 104,456    
Vested (in shares) 0    
Forfeited (in shares) 0    
Ending balance (in shares) 104,456 0  
Weighted Average Grant Date Fair Value      
Beginning balance (in dollars per share) $ 0    
Granted (in dollars per share) 44.28    
Vested (in dollars per share) 0    
Forfeited (in dollars per share) 0    
Ending balance (in dollars per share) $ 44.28 $ 0  
TSR | Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Grantee's continued service through the vesting date period (in years) 3 years    
TSR | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Grantee's continued service through the vesting date period (in years) 4 years