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Fair Value Measurements (Details) - Recurring - USD ($) $ in Thousands | Dec. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Assets: |  |
Investments in rabbi trust | $ 8,198 | $ 9,292
Total assets measured at fair value | 8,198 | 9,292
Level 1 |  |
Assets: |  |
Investments in rabbi trust | 8,198 | 9,292
Total assets measured at fair value | 8,198 | 9,292
Level 2 |  |
Assets: |  |
Investments in rabbi trust | 0 | 0
Total assets measured at fair value | 0 | 0
Level 3 |  |
Assets: |  |
Investments in rabbi trust | 0 | 0
Total assets measured at fair value | $ 0 | $ 0

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