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Summary of Significant Accounting Policies - Supplemental Cash Flow Information (Detail) - USD ($) | 6 Months Ended |  |
--- | --- | --- | ---
Jul. 03, 2021 | Jun. 27, 2020 | Jan. 02, 2021 | Dec. 28, 2019
Accounting Policies [Abstract] |  |  |  |
Interest expense | $ 196,000 | $ 130,000 |  |
Income taxes | 24,152,000 | 10,049,000 |  |
Operating lease liabilities | 3,676,000 | 3,038,000 |  |
ROU assets obtained in exchange for lease liabilities | 4,423,000 | 7,394,000 |  |
Unpaid purchases of property and equipment | 2,381,000 | 3,135,000 |  |
Noncash or Part Noncash Acquisition, Intangible Assets Acquired | 3,000,000 |  |  |
Settlement of promissory note receivable in connection with business combination | $ 0 | 5,100,000 |  |
Transfer to Investments | 6,000 |  |  |
Deposit release to acquire noncontrolling interest(1) | $ 3,374,000 | 0 |  |
Unsettled common stock proceeds from option exercises | 202,000 | 94,000 |  |
Fair value of common stock received for payment of stock option exercise price | 0 | 220,000 |  |
Cash and cash equivalents | 575,955,000 | 631,881,000 | $ 641,447,000 |
Restricted cash | 1,388,000 | 3,376,000 |  |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents | $ 577,343,000 | $ 635,257,000 | $ 645,004,000 | $ 568,075,000

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