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Summary of Significant Accounting Policies - Supplemental Cash Flow Information (Detail) - USD ($)
 9 Months Ended
Sep. 26, 2020
Sep. 28, 2019
Dec. 28, 2019
Dec. 29, 2018
Accounting Policies [Abstract]        
Interest expense $ 194,000 $ 134,000    
Income taxes 35,961,000 34,123,000    
Operating lease liabilities 4,699,000 5,076,000    
ROU assets obtained in exchange for lease liabilities 9,900,000 25,965,000    
Unpaid purchases of property and equipment 3,988,000 4,170,000    
Settlement of promissory note receivable in connection with business combination 5,100,000 0    
Unsettled common stock proceeds from option exercises 27,000 0    
Fair value of common stock received for payment of stock option exercise price 220,000 0    
Cash and cash equivalents 669,056,000 513,360,000 $ 567,687,000  
Restricted cash 3,384,000 152,000    
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents $ 672,440,000 $ 513,512,000 $ 568,075,000 $ 552,641,000