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Employee Benefit Plans Employee Benefit Plans Narrative 3 (Details) $ in Thousands | 12 Months Ended
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Dec. 28, 2019 USD ($) plan | Dec. 29, 2018 USD ($) | Dec. 30, 2017 USD ($)
Employee Benefit Plans [Abstract] |  |  |
Number of Multiemployer Plans, Certified Red Zone | 5 |  |
Number Of Multiemployer Plans, Withdrawal Obligation Could Be Material | 2 |  |
Number of Multiemployer Plans, Certified Yellow Zone | 2 |  |
Contributions | $ | $ 3,626 | $ 3,547 | $ 3,472
Multiemployer Plans, Withdrawal Obligation | $ | $ 6,000 |  |

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- Definition Amount of the obligation recognized by withdrawing from a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers. + References No definition available. + Details
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