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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

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