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Segment Information and Enterprise Reporting Long-lived assets by geographic area (Details) - USD ($) $ in Thousands | Jun. 27, 2020 | Dec. 28, 2019
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Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Long-Lived Assets | $ 265,044 | $ 219,926
Concentration Risk, Long-lived Asset Geographic Area, Percentage | 100.00% | 100.00%
Reportable Geographical Components | United States (U.S.) |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Long-Lived Assets | $ 236,880 | $ 216,650
Concentration Risk, Long-lived Asset Geographic Area, Percentage | 89.40% | 98.50%
Reportable Geographical Components | International |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Long-Lived Assets | $ 28,164 | $ 3,276
Concentration Risk, Long-lived Asset Geographic Area, Percentage | 10.60% | 1.50%

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