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Provision for Income Taxes - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 29, 2018 | Sep. 30, 2017 | Sep. 29, 2018 | Sep. 30, 2017 | Dec. 30, 2017
Income Tax Disclosure [Abstract] |  |  |  |  |
Provisional net income tax expense |  |  | $ 792 |  |
Provision for income taxes | $ 6,443 | $ 4,860 | $ 15,575 | $ 10,550 |
Effective tax rate |  |  | 27.00% | 26.00% |
Statutory tax rate |  |  | 21.00% |  | 35.00%

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