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DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) $ / shares in Units, $ in Thousands |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Nov. 21, 2021 | Dec. 28, 2025 USD ($) store segment reportingUnit restaurant hour | Dec. 29, 2024 USD ($) | Dec. 31, 2023 USD ($) | Dec. 28, 2025 USD ($) | Dec. 28, 2025 restaurant | Dec. 28, 2025 state | Dec. 28, 2025 store | Nov. 22, 2021 $ / shares | Sep. 07, 2021 USD ($)
Change in Accounting Estimate [Line Items] |  |  |  |  |  |  |  |  |  |
Number of restaurants | restaurant |  |  |  |  |  | 281 |  |  |  |
Number of states | state |  |  |  |  |  |  | 24 |  |  |
Number of restaurants opened | restaurant |  | 35 |  |  |  |  |  |  |  |
Operating segments | segment |  | 1 |  |  |  |  |  |  |  |
Reportable segments | segment |  | 1 |  |  |  |  |  |  |  |
Accounts receivable |  |  | $ 5,034 |  | $ 5,166 |  |  |  |  |
FDIC insured amount |  |  |  |  | 300 |  |  |  |  |
Deferred cost capitalized in enterprise resource planning |  |  | 3,800 |  | 3,300 |  |  |  |  |
Other assets |  |  | 3,838 |  | 3,341 |  |  |  |  |
Amortization period of deferred costs |  | 7 years |  |  |  |  |  |  |  |
Abandoned sites and other site selection costs |  | $ 1,300 | 200 | $ 300 |  |  |  |  |  |
Internal costs capitalized |  | 4,000 | 4,600 |  |  |  |  |  |  |
Restructuring charges |  | 3,630 | 2,276 | 7,437 |  |  |  |  |  |
Research and development |  | 1,000 | 1,200 |  |  |  |  |  |  |
Payment of contingent consideration |  | $ 0 | 3,868 | 10,421 |  |  |  |  |  |
Number of reporting units | reportingUnit |  | 1 |  |  |  |  |  |  |  |
Lease term |  | 10 years |  |  |  |  |  |  |  |
Impairment of property and equipment and operating lease assets |  | $ 11,300 |  |  |  |  |  |  |  |
Number of stores impaired | store |  | 12 |  |  |  |  |  |  |  |
Operating lease, impairment loss |  | $ 1,594 | 389 | 4,300 |  |  |  |  |  |
Marketing expense |  | $ 19,000 | 16,900 | 14,300 |  |  |  |  |  |
Dividend yield |  | 0.00% |  |  |  |  |  |  |  |
Matching percent |  | 50.00% |  |  |  |  |  |  |  |
Percent of employees' gross pay |  | 3.00% |  |  |  |  |  |  |  |
Eligible worked period |  | 6 months |  |  |  |  |  |  |  |
Employee eligible working hours | hour |  | 500 |  |  |  |  |  |  |  |
Eligible age |  | 21 years |  |  |  |  |  |  |  |
Impairment and closure costs |  | $ 12,065 | 2,218 | 624 |  |  |  |  |  |
One Store |  |  |  |  |  |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |  |  |  |  |  |
Operating lease, impairment loss |  | 400 |  |  |  |  |  |  |  |
Impairment charges |  | 1,300 |  |  |  |  |  |  |  |
Impairment and closure costs |  | 1,700 |  |  |  |  |  |  |  |
Recurring |  |  |  |  |  |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |  |  |  |  |  |
Contingent consideration liability |  |  | 14,974 |  | 7,000 |  |  |  |  |
Level 3 | Recurring |  |  |  |  |  |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |  |  |  |  |  |
Contingent consideration liability |  |  | 14,974 |  | 7,000 |  |  |  |  |
Other Current Liabilities | Level 3 | Recurring |  |  |  |  |  |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |  |  |  |  |  |
Contingent consideration liability |  |  | 9,700 |  |  |  |  |  |  |
Contingent Consideration Liability | Level 3 | Recurring |  |  |  |  |  |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |  |  |  |  |  |
Contingent consideration liability |  |  | 5,300 |  |  |  |  |  |  |
General and Administrative Expense |  |  |  |  |  |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |  |  |  |  |  |
Marketing expense |  | 11,300 | 13,200 | 10,700 |  |  |  |  |  |
Other restaurant operating costs |  |  |  |  |  |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |  |  |  |  |  |
Marketing expense |  | 6,800 | 3,300 | 3,100 |  |  |  |  |  |
Preopening costs |  |  |  |  |  |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |  |  |  |  |  |
Marketing expense |  | 900 | 400 | 500 |  |  |  |  |  |
One Spyce store closed |  |  |  |  |  |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |  |  |  |  |  |
Number of restaurants |  |  |  |  |  | 1 |  | 3 |  |
Impairment and closure costs |  | $ 800 | 500 |  |  |  |  |  |  |
Minimum |  |  |  |  |  |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |  |  |  |  |  |
Lease term |  | 10 years |  |  |  |  |  |  |  |
Renewal term |  | 5 years |  |  |  |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |  |  |  |  |  |
Lease term |  | 15 years |  |  |  |  |  |  |  |
Renewal term |  | 15 years |  |  |  |  |  |  |  |
Internal use software |  |  |  |  |  |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |  |  |  |  |  |
Useful life |  | 3 years |  |  |  |  |  |  |  |
Developed technology |  |  |  |  |  |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |  |  |  |  |  |
Useful life |  | 5 years |  |  |  |  |  |  |  |
Operating Lease Costs |  |  |  |  |  |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |  |  |  |  |  |
Restructuring charges |  | $ 1,400 | 1,500 | $ 1,800 |  |  |  |  |  |
Variable Lease Costs |  |  |  |  |  |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |  |  |  |  |  |
Restructuring charges |  | $ 600 | $ 500 |  |  |  |  |  |  |
New York City metropolitan area | Revenue | Geographic |  |  |  |  |  |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |  |  |  |  |  |
Concentration risk percentage |  | 24.00% | 25.00% | 28.00% |  |  |  |  |  |
Credit card processors |  |  |  |  |  |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |  |  |  |  |  |
Accounts receivable |  |  | $ 2,300 |  | 3,600 |  |  |  |  |
PSU |  |  |  |  |  |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |  |  |  |  |  |
Vesting period |  | 1 year |  |  |  |  |  |  |  |
Options |  |  |  |  |  |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |  |  |  |  |  |
Dividend yield |  | 0.00% | 0.00% | 0.00% |  |  |  |  |  |
Options | Minimum |  |  |  |  |  |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |  |  |  |  |  |
Vesting period |  | 12 months |  |  |  |  |  |  |  |
Options | Maximum |  |  |  |  |  |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |  |  |  |  |  |
Vesting period |  | 4 years |  |  |  |  |  |  |  |
RSUs |  |  |  |  |  |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |  |  |  |  |  |
Vesting period | 4 years |  |  |  |  |  |  |  |  |
Spyce |  |  |  |  |  |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |  |  |  |  |  |
Contingent consideration liability |  |  | $ 15,000 |  | $ 7,000 |  |  |  |  | $ 16,400
Spyce | Other Current Liabilities |  |  |  |  |  |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |  |  |  |  |  |
Contingent consideration liability |  |  | 9,700 |  |  |  |  |  |  |
Spyce | Contingent Consideration Liability |  |  |  |  |  |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |  |  |  |  |  |
Contingent consideration liability |  |  | $ 5,300 |  |  |  |  |  |  |
Spyce | Maximum |  |  |  |  |  |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |  |  |  |  |  |
Contingent consideration liability |  |  |  |  |  |  |  |  |  | $ 20,000
IPO |  |  |  |  |  |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |  |  |  |  |  |
Shares issued (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  | $ 28.00 |

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