Summary of Significant Accounting Policies-Cash Flow Information (Details) - USD ($)	12 Months Ended
	Jan. 01, 2022	Jan. 02, 2021	Dec. 28, 2019	Dec. 29, 2018
Cash paid during the year for:
Interest expense	$ 285,000	$ 270,000	$ 211,000
Income taxes	43,947,000	39,491,000	42,270,000
Operating lease liabilities	7,306,000	6,276,000	6,676,000
Non-cash investing activities:
ROU assets obtained in exchange for lease liabilities(1)	6,042,000	15,387,000	26,484,000
Unpaid purchases of property and equipment	0	2,053,000	6,686,000
Settlement of promissory note in connection with acquisition option exercise	0	5,100,000	0
Unsettled common stock proceeds from option exercises	694,000	3,011,000	14,000
Fair value of common stock received for payment of stock option exercise price	0	1,616,000	0
Cash and Cash Equivalents, at Carrying Value	745,250,000	641,447,000	567,687,000
Restricted cash	3,127,000	3,557,000	388,000
Total cash, cash equivalents and restricted cash shown in the statement of cash flows	$ 748,377,000	$ 645,004,000	$ 568,075,000	$ 552,641,000