Annual report pursuant to Section 13 and 15(d)

Stock-Based Compensation - Summary of Stock Option Activity (Detail)

v3.20.4
Stock-Based Compensation - Summary of Stock Option Activity (Detail) - Stock Options - $ / shares
12 Months Ended
Dec. 26, 2020
Dec. 28, 2019
Dec. 29, 2018
Number of Shares      
Outstanding, beginning balance (in shares) 81,700    
Exercisable, beginning balance (in shares) 0    
Granted (in shares) 11,607    
Exercised or converted (in shares) 7,333 100 200
Forfeited or expired (in shares) 8,582    
Outstanding, ending balance (in shares) 77,392 81,700  
Exercisable, ending balance (in shares) 21,315 0  
Weighted Average Exercise Price Per Share (in whole dollars)      
Exercisable, beginning balance (in dollars per share) $ 0    
Outstanding, beginning balance (in dollars per share) 1,207    
Granted (in dollars per share) 0    
Exercised or converted (in dollars per share) 0    
Forfeited or expired (in dollars per share) 0    
Outstanding, ending balance (in dollars per share) 1,257 $ 1,207  
Exercisable, ending balance (in dollars per share) $ 1,185 $ 0  
Outstanding, Weighted Average Remaining Contractual Term (Years) 8 years 8 years  
Exercisable, Weighted Average Remaining Contractual Term (Years) 7 years