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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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Tax Cuts And Jobs Act Of 2017, Incomplete Accounting, Provisional Income Tax Expense (Benefit)

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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