Summary of Significant Accounting Policies Long-lived assets (Details) - USD ($) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 29, 2018 |
Dec. 30, 2017 |
Dec. 31, 2016 |
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| Property, Plant and Equipment [Abstract] | |||
| Impairment of Long-Lived Assets to be Disposed of | $ 837 | $ 1,569 | $ 0 |
| X | ||||||||||
- Definition The aggregate amount of write-downs for impairments recognized during the period for long-lived assets held for abandonment, exchange or sale. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- References No definition available.
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