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Summary of Significant Accounting Policies-Cash Flow Information (Details) - USD ($)
 12 Months Ended
Jan. 02, 2021
Dec. 28, 2019
Dec. 29, 2018
Dec. 30, 2017
Cash paid during the year for:        
Interest expense $ 270,000 $ 211,000 $ 193,000  
Income taxes 39,491,000 42,270,000 36,589,000  
Operating lease liabilities 6,276,000 6,676,000 0  
Non-cash investing activities:        
ROU assets obtained in exchange for lease liabilities(1) 15,387,000 26,484,000 0  
Unpaid purchases of property and equipment 2,053,000 6,686,000 2,391,000  
Settlement of promissory note in connection with acquisition option exercise 5,100,000 0 0  
Unsettled common stock proceeds from option exercises 3,011,000 14,000 4,000  
Fair value of common stock received for payment of stock option exercise price 1,616,000 0 0  
Cash and cash equivalents 641,447,000 567,687,000 552,490,000  
Restricted cash 3,557,000 388,000 151,000  
Total cash, cash equivalents and restricted cash shown in the statement of cash flows $ 645,004,000 $ 568,075,000 $ 552,641,000 $ 315,483,000