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Summary of Significant Accounting Policies - Supplemental Cash Flow Information (Detail) - USD ($)	3 Months Ended
	Apr. 03, 2021	Mar. 28, 2020	Jan. 02, 2021	Dec. 28, 2019
Accounting Policies [Abstract]
Interest expense	$ 66,000	$ 66,000
Income taxes	1,118,000	3,886,000
Operating lease liabilities	1,763,000	1,463,000
ROU assets obtained in exchange for lease liabilities	3,316,000	8,144,000
Unpaid purchases of property and equipment	1,608,000	4,240,000
Deposit release to acquire noncontrolling interest(1)	3,374,000	0
Unsettled common stock proceeds from option exercises	142,000	466,000
Cash and cash equivalents	551,992,000	605,916,000	$ 641,447,000
Restricted cash	2,224,000	376,000
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	$ 554,216,000	$ 606,292,000	$ 645,004,000	$ 568,075,000

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