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Income Taxes - Reconciliation to Federal Statutory Amount (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 30, 2017	Dec. 31, 2016	Jan. 02, 2016
Income Tax Disclosure [Abstract]
Expense (benefit) from income taxes computed at the federal statutory tax rate	$ 3,355	$ 6,022	$ (3,998)
Expense (benefit) from state income taxes, net of federal benefit	253	595	(474)
Valuation allowance change	(87,137)	(6,319)	4,318
Nondeductible items	664	403	288
Alternative minimum tax	0	232	0
Tax Cuts and Jobs Act of 2017	29,387	0	0
Other	69	188	19
(Benefit from) provision for income taxes	$ (53,409)	$ 1,121	$ 153

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

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in the valuation allowance for deferred tax assets.

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