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Summary of Significant Accounting Policies - Supplemental Cash Flow Information (Detail) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 27, 2020
Jun. 29, 2019
Dec. 28, 2019
Dec. 29, 2018
Accounting Policies [Abstract]        
Interest expense $ 130 $ 73    
Income taxes 10,049 26,975    
Operating lease liabilities 3,038 3,409    
ROU assets obtained in exchange for lease liabilities 7,394 24,093    
Unpaid purchases of property and equipment 3,135 1,216    
Settlement of promissory note in connection with acquisition option exercise 5,100      
Unsettled common stock proceeds from option exercises 94 283    
Fair value of common stock received for payment of stock option exercise price 220      
Cash and cash equivalents 631,881 408,784 $ 567,687  
Restricted cash 3,376 155    
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents $ 635,257 $ 408,939 $ 568,075 $ 552,641