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Summary of Significant Accounting Policies - Net Income per Share (Details) - shares shares in Thousands | 12 Months Ended
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Dec. 26, 2020 | Dec. 28, 2019 | Dec. 29, 2018
Accounting Policies [Abstract] |  |  |
Weighted-average shares used in computing basic net income (loss) per share (in shares) | 76,681 | 74,994 | 73,482
Add potentially dilutive securities (in shares) | 2,320 | 2,292 | 1,700
Weighted-average shares used in computing basic and diluted net income per share (in shares) | 79,001 | 77,286 | 75,182

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