Segment Reporting - Reconciliation of Operating Income to Restaurant-Level EBITDA (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 25, 2019	Jun. 26, 2018	Jun. 25, 2019	Jun. 26, 2018
Segment Reporting [Abstract]
Operating loss	$ (608)	$ (3,014)	$ (12,422)	$ (2,705)
Pre-opening costs	1,301	1,403	4,050	2,549
General and administrative costs	17,117	7,988	33,489	15,778
Donations	163	16	195	58
Consulting project costs	3,450	621	7,954	854
Acquisition costs	0	4,338	0	4,946
Reorganization severance	480	0	777	113
Lease termination and closing costs	(1,754)	589	1,154	591
Depreciation and amortization	8,144	4,237	15,795	8,372
Restaurant-level EBITDA	$ 28,293	$ 16,178	$ 50,992	$ 30,556

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Donation Expense

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Restaurant Level Earnings Before Interest Taxes Depreciation And Amortization

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This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities.

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Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Includes, but is not limited to, one-time termination benefits, termination of an operating lease or other contract, consolidating or closing facilities, and relocating employees, and termination benefits associated with an ongoing benefit arrangement. Excludes expenses associated with special or contractual termination benefits, a discontinued operation or an asset retirement obligation.

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The aggregate total of expenses of managing and administering the affairs of an entity, including affiliates of the reporting entity, which are not directly or indirectly associated with the manufacture, sale or creation of a product or product line.

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The net result for the period of deducting operating expenses from operating revenues.

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Expenditures associated with opening new locations which are noncapital in nature and expensed as incurred.

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Amount of expenses for special or contractual termination benefits provided to current employees involuntarily terminated under a benefit arrangement associated exit or disposal activities pursuant to an authorized plan. Excludes expenses related to one-time termination benefits, a discontinued operation or an asset retirement obligation.

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