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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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