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Provision for Income Taxes - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2018 | Jul. 01, 2017 | Jun. 30, 2018 | Jul. 01, 2017 | Dec. 30, 2017
Income Tax Disclosure [Abstract] |  |  |  |  |
Provisional net income tax expense |  |  | $ 792 |  |
Provision for income taxes | $ 5,271 | $ 2,955 | $ 9,132 | $ 5,690 |
Effective tax rate |  |  | 28.00% | 25.00% |
Statutory tax rate |  |  | 21.00% |  | 35.00%
Tax expense related to repatriating earnings of certain foreign subsidiaries |  |  | $ 426 |  |

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