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DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 25, 2023 USD ($) restaurant state | Jun. 26, 2022 USD ($) | Jun. 25, 2023 USD ($) segment state restaurant | Jun. 26, 2022 USD ($) | Dec. 25, 2022 USD ($)
Change in Accounting Estimate [Line Items] |  |  |  |  |
Number of restaurants | restaurant | 205 |  | 205 |  |
Number of states | state | 18 |  | 18 |  |
Number of restaurants opened | restaurant | 10 |  | 19 |  |
Operating segments | segment |  |  | 1 |  |
Reportable segments | segment |  |  | 1 |  |
Restaurant operating costs | $ 121,436,000 | $ 101,775,000 | $ 229,561,000 | $ 190,975,000 |
Non-cash impairment | 4,300,000 |  |  |  |
Non-cash impairment and closure costs | 157,000 | $ 182,000 | 347,000 | $ 199,000 |
Contingent consideration liability | 21,275,000 |  | 21,275,000 |  | $ 21,296,000
Accounts receivable | 7,816,000 |  | 7,816,000 |  | 3,244,000
Federal deposit insurance corporation (up to) |  |  | 250,000 |  |
Deferred costs | $ 4,600,000 |  | $ 4,600,000 |  |
Amortization period of deferred costs |  |  | 7 years |  |
New York City Metropolitan Area | Revenue | Geographic |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |
Concentration risk percentage | 29.00% | 33.00% | 30.00% | 32.00% |
Credit Card Processors |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |
Accounts receivable | $ 2,800,000 |  | $ 2,800,000 |  | $ 700,000
Spyce |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |
Contingent consideration liability | 16,400,000 |  | 16,400,000 |  |
Contingent consideration liability | 21,300,000 |  | 21,300,000 |  |
One Spyce Store Closed |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |
Non-cash impairment and closure costs | $ 200,000 | $ 200,000 | $ 300,000 | $ 200,000 |
Corporate Closed Store |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |
Number of restaurants | restaurant | 3 |  | 3 |  |
Occupancy and related expenses |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |
Restaurant operating costs | $ 13,526,000 | 11,150,000 | $ 26,156,000 | 21,667,000 |
Occupancy and related expenses | Revision of Prior Period, Reclassification, Adjustment |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |
Restaurant operating costs |  | (4,600,000) |  | (8,800,000) |
Other restaurant operating costs |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |
Restaurant operating costs | $ 23,405,000 | 19,715,000 | $ 44,070,000 | 36,990,000 |
Other restaurant operating costs | Revision of Prior Period, Reclassification, Adjustment |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |
Restaurant operating costs |  | $ 4,600,000 |  | $ 8,800,000 |

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