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DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 26, 2022 USD ($) state restaurant store	Jun. 27, 2021 USD ($)	Jun. 26, 2022 USD ($) state segment restaurant	Jun. 27, 2021 USD ($)	Dec. 26, 2021 USD ($)
Change in Accounting Estimate [Line Items]
Number of restaurants | restaurant	166		166
Number of states | state	13		13
Number of restaurants opened | restaurant	8		16
Operating segments | segment			1
Reportable segments | segment			1
Stores closed | store	1
Closed-store costs	$ 200		$ 152	$ 0
Contingent consideration liability fair value	18,625		18,625		$ 20,477
Accounts receivable	3,513		3,513		2,644
Federal deposit insurance corporation (up to)			300
Deferred costs	3,400		3,400
General and administrative	51,262	$ 26,081	100,934	$ 49,462
Minimum | Cumulative Effect, Period of Adoption, Adjustment | Pro Forma
Change in Accounting Estimate [Line Items]
Operating lease liabilities	295,000		295,000
Right-of-use assets	240,000		240,000
General and administrative			1,500
Minimum | Accumulated Deficit | Cumulative Effect, Period of Adoption, Adjustment | Pro Forma
Change in Accounting Estimate [Line Items]
Cumulative-effect adjustment	4,000		4,000
Maximum | Cumulative Effect, Period of Adoption, Adjustment | Pro Forma
Change in Accounting Estimate [Line Items]
Operating lease liabilities	345,000		345,000
Right-of-use assets	290,000		290,000
General and administrative			2,500
Maximum | Accumulated Deficit | Cumulative Effect, Period of Adoption, Adjustment | Pro Forma
Change in Accounting Estimate [Line Items]
Cumulative-effect adjustment	$ 5,000		$ 5,000
Geographic | Revenue | New York City metropolitan area
Change in Accounting Estimate [Line Items]
Concentration risk percentage	33.00%	33.00%	32.00%	32.00%
Credit card processors
Change in Accounting Estimate [Line Items]
Accounts receivable	$ 2,100		$ 2,100		$ 1,100
Spyce
Change in Accounting Estimate [Line Items]
Research and development cost	3,300		4,700
Contingent consideration liability	16,400		16,400
Contingent consideration liability fair value	$ 18,600		$ 18,600

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