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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. 29, 2024 USD ($) restaurant hour segment state reportingUnit | Dec. 31, 2023 USD ($) | Dec. 25, 2022 USD ($) restaurant | Nov. 22, 2021 $ / shares | Sep. 07, 2021 USD ($)
Change in Accounting Estimate [Line Items] |  |  |  |  |  |
Number of restaurants | restaurant |  | 246 |  |  |  |
Number of states | state |  | 22 |  |  |  |
Number of restaurants opened | restaurant |  | 25 |  |  |  |
Operating segments | segment |  | 1 |  |  |  |
Reportable segments | segment |  | 1 |  |  |  |
Stock-based compensation |  | $ 39,024 | $ 49,532 | $ 78,736 |  |
Accounts receivable |  | 5,034 | 3,502 |  |  |
FDIC insured amount |  | 300 |  |  |  |
Deferred cost capitalized in enterprise resource planning |  | 3,800 | 4,200 |  |  |
Other assets |  | $ 3,838 | 4,218 |  |  |
Amortization period of deferred costs |  | 7 years |  |  |  |
Abandoned sites and other site selection costs |  | $ 200 | 300 | 900 |  |
Internal costs capitalized |  | 4,600 | 4,700 |  |  |
Business exit costs |  |  |  | 400 |  |
Restructuring charges |  | 2,276 | 7,437 | 14,442 |  |
Non-cash restructuring expense |  |  |  | $ 13,000 |  |
Workforce reductions percentage |  |  |  | 5.00% |  |
Other related expenses |  |  |  | $ 200 |  |
Research and development |  | 1,000 | 1,200 | 2,000 |  |
Payment of contingent consideration |  | $ 3,868 | 10,421 | 0 |  |
Number of reporting units | reportingUnit |  | 1 |  |  |  |
Lease term |  | 10 years |  |  |  |
Impairment of property and equipment and operating lease assets |  | $ 1,700 |  |  |  |
Operating lease, impairment loss |  | 389 | 4,291 | 6,200 |  |
Impairment and closure costs |  | 1,300 |  | 15,000 |  |
Marketing expense |  | $ 16,900 | 14,300 | 14,500 |  |
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 |  |  |  |
Matching contribution |  |  | 1,000 |  |  |
Letter of Credit |  |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |  |
Restricted Cash |  | $ 2,500 |  |  |  |
Restructuring charges |  |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |  |
Impairment and closure costs |  |  |  | $ 12,600 |  |
Impairment and closure costs, extensible enumeration |  |  |  | Restructuring charges |  |
Impairment and closure costs |  |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |  |
Impairment and closure costs |  |  |  | $ 2,400 |  |
Impairment and closure costs, extensible enumeration |  |  |  | Impairment and closure costs |  |
General and Administrative Expense |  |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |  |
Marketing expense |  | 13,200 | 10,700 | $ 10,900 |  |
Other restaurant operating costs |  |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |  |
Marketing expense |  | 3,300 | 3,100 | 2,700 |  |
Preopening costs |  |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |  |
Marketing expense |  | 400 | 500 | 1,000 |  |
Property, Plant and Equipment |  |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |  |
Impairment and closure costs |  |  |  | 8,800 |  |
Property, Plant and Equipment | Restructuring charges |  |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |  |
Impairment and closure costs |  | $ 6,800 |  |  |  |
Impairment and closure costs, extensible enumeration |  | Restructuring charges |  |  |  |
Property, Plant and Equipment | Impairment and closure costs |  |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |  |
Impairment and closure costs |  | $ 2,000 |  |  |  |
Impairment and closure costs, extensible enumeration |  | Impairment and closure costs |  |  |  |
Property Subject to Operating Lease |  |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |  |
Impairment and closure costs |  |  | 6,200 |  |  |
Impairment and closure costs, extensible enumeration |  | Restructuring charges |  |  |  |
Property Subject to Operating Lease | Restructuring charges |  |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |  |
Impairment and closure costs |  |  | $ 5,800 |  |  |
Impairment and closure costs, extensible enumeration |  |  | Restructuring charges |  |  |
Property Subject to Operating Lease | Impairment and closure costs |  |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |  |
Impairment and closure costs |  |  | $ 400 |  |  |
Impairment and closure costs, extensible enumeration |  |  | Restructuring charges |  |  |
Vacated Sweetgreen Support Center |  |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |  |
Impairment and closure costs |  |  |  | $ 6,800 |  |
Impairment and closure costs, extensible enumeration |  |  |  | Restructuring charges |  |
Vacated Sweetgreen Support Center | Restructuring charges |  |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |  |
Impairment and closure costs |  |  |  | $ 5,800 |  |
Impairment and closure costs, extensible enumeration |  |  |  | Restructuring charges |  |
Vacated Sweetgreen Support Center | Impairment and closure costs |  |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |  |
Impairment and closure costs |  |  |  | $ 400 |  |
Impairment and closure costs, extensible enumeration |  |  |  | Impairment and closure costs |  |
Certain Store Locations |  |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |  |
Impairment and closure costs |  |  |  | $ 2,000 |  |
One Spyce store closed |  |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |  |
Number of restaurants | restaurant |  | 3 |  | 1 |  |
Impairment and closure costs |  | $ 500 |  | $ 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 |  |  |  |
Abandonment of Potential Future Restaurant Sites |  |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |  |
Business exit costs |  |  |  | 600 |  |
Facility Closing |  |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |  |
Restructuring charges |  | $ 2,300 | $ 7,400 | 6,800 |  |
Contract Termination |  |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |  |
Restructuring charges |  |  |  | 5,800 |  |
Employee Severance |  |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |  |
Severance |  |  |  | $ 600 |  |
Operating Lease Costs |  |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |  |
Restructuring charges |  | 1,500 | 1,800 |  |  |
Variable Lease Costs |  |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |  |
Restructuring charges |  | $ 500 | $ 500 |  |  |
New York City metropolitan area | Revenue | Geographic |  |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |  |
Concentration risk percentage |  | 25.00% | 28.00% | 32.00% |  |
Credit card processors |  |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |  |
Accounts receivable |  | $ 2,300 | $ 3,000 |  |  |
PSU |  |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |  |
Stock-based compensation |  | $ 18,705 | 32,097 | $ 36,194 |  |
Vesting period |  | 1 year |  |  |  |
Options |  |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |  |
Stock-based compensation |  | $ 11,773 | $ 8,878 | $ 10,505 |  |
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] |  |  |  |  |  |
Stock-based compensation |  | $ 8,546 | $ 8,557 | $ 32,037 |  |
Vesting period | 4 years |  |  |  |  |
Spyce |  |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |  |
Contingent consideration liability |  | 14,974 | 8,400 |  |  | $ 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 | PSU |  |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |  |
Stock-based compensation |  | $ 2,400 | $ 3,400 |  |  |
IPO |  |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |  |
Shares issued (in dollars per share) | $ / shares |  |  |  |  | $ 28.00 |

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