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Segment Information and Enterprise Reporting Long-lived assets by geographic area (Details) - USD ($) $ in Thousands | Mar. 30, 2019 | Dec. 29, 2018
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Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Long-Lived Assets | $ 248,409 | $ 296,309
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 | $ 229,088 | $ 280,215
Concentration Risk, Long-lived Asset Geographic Area, Percentage | 92.20% | 94.60%
Reportable Geographical Components | International |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Long-Lived Assets | $ 19,321 | $ 16,094
Concentration Risk, Long-lived Asset Geographic Area, Percentage | 7.80% | 5.40%

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