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Summary of Significant Accounting Policies - Supplemental Cash Flow Information (Detail) - USD ($) $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2018 | Apr. 01, 2017 | Dec. 30, 2017 | Dec. 31, 2016
Accounting Policies [Abstract] |  |  |  |
Income taxes | $ 1,023 | $ 3,157 |  |
Interest | 169 | 213 |  |
Unpaid purchases of property, plant and equipment | 1,492 | 1,203 |  |
Unsettled common stock proceeds from option exercises | 794 | 2,560 |  |
Cash and cash equivalents | 369,498 | 343,825 | $ 315,302 |
Restricted cash | 152 | 679 |  |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents | $ 369,650 | $ 344,504 | $ 315,483 | $ 308,198

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