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Acquisitions - Zentri (Details) - USD ($) $ in Thousands | Jan. 20, 2017 | Dec. 28, 2019 | Dec. 29, 2018 | Dec. 30, 2017
--- | --- | --- | --- | ---
Purchase price allocation |  |  |  |
Goodwill |  | $ 398,402 | $ 397,344 | $ 288,227
Zentri |  |  |  |
Acquisitions |  |  |  |
Purchase price of acquisition | $ 18,100 |  |  |
Cash consideration | 14,300 |  |  |
Fair value of contingent consideration | 3,800 |  |  |
Purchase price allocation |  |  |  |
Intangible assets | 6,700 |  |  |
Goodwill | 12,100 |  |  |
Other net liabilities | $ 700 |  |  |

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