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Acquisitions - Zentri (Details) - USD ($) $ in Thousands | Jan. 20, 2017 | Dec. 29, 2018 | Dec. 30, 2017 | Dec. 31, 2016
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Purchase price allocation |  |  |  |
Goodwill |  | $ 397,344 | $ 288,227 | $ 276,130
Zentri |  |  |  |
Acquisitions |  |  |  |
Purchase price of acquisition | $ 18,100 |  |  |
Cash consideration | 14,300 |  |  |
Potential additional consideration with estimated fair value | 3,800 |  |  |
Purchase price allocation |  |  |  |
Intangible assets | 6,700 |  |  |
Goodwill | 12,100 |  |  |
Other net liabilities | $ 700 |  |  |

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