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DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) $ / shares in Units, $ in Thousands |  |  | 1 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Nov. 22, 2021 USD ($) $ / shares shares | Nov. 21, 2021 | Sep. 30, 2021 shares | Dec. 31, 2023 USD ($) restaurant state hour reportingUnit segment shares | Dec. 25, 2022 USD ($) restaurant shares | Dec. 26, 2021 USD ($) restaurant shares | Nov. 22, 2022 shares | Sep. 07, 2021 USD ($) | Dec. 27, 2020 shares
Change in Accounting Estimate [Line Items] |  |  |  |  |  |  |  |  |
Number of restaurants | restaurant |  |  |  | 221 |  |  |  |  |
Number of states | state |  |  |  | 18 |  |  |  |  |
Number of restaurants opened | restaurant |  |  |  | 35 |  |  |  |  |
Operating segments | segment |  |  |  | 1 |  |  |  |  |
Reportable segments | segment |  |  |  | 1 |  |  |  |  |
Underwriting discounts and commissions |  |  |  |  | $ 33,900 |  |  |  |
Common stock, shares outstanding (in shares) | shares | 92,754,432 |  |  |  |  |  |  |  |
Change in fair value of preferred stock warrant liability |  |  |  | $ 0 | 0 | $ 14,955 |  |  |
Total stock-based compensation |  |  |  | 49,532 | 78,736 | 28,897 |  |  |
Accounts receivable |  |  |  | 3,502 | 3,244 |  |  |  |
FDIC insured amount |  |  |  | 300 |  |  |  |  |
Tenant improvement receivable |  |  |  | 800 | 300 |  |  |  |
Deferred cost capitalized in enterprise resource planning |  |  |  | 4,200 | 4,800 |  |  |  |
Other assets |  |  |  | $ 4,218 | 4,767 |  |  |  |
Amortization period of deferred costs |  |  |  | 7 years |  |  |  |  |
Abandoned sites and other site selection costs |  |  |  | $ 300 | 900 | 1,200 |  |  |
Internal costs capitalized |  |  |  | 4,700 | 4,000 |  |  |  |
Business exit costs |  |  |  |  | 400 |  |  |  |
Restructuring charges |  |  |  | 7,437 | 14,442 | 0 |  |  |
Non-cash restructuring expense |  |  |  |  | $ 13,000 |  |  |  |
Workforce reductions percentage |  |  |  |  | 5.00% |  |  |  |
Other related expenses |  |  |  |  | $ 200 |  |  |  |
Research and development |  |  |  | 1,200 | 2,000 |  |  |  |
Payment of contingent consideration |  |  |  | $ 10,421 | 0 | 0 |  |  |
Number of reporting units | reportingUnit |  |  |  | 1 |  |  |  |  |
Lease term |  |  |  | 10 years |  |  |  |  |
Amortization of lease acquisition costs |  |  |  | $ 92 | 93 | 402 |  |  |
Total lease acquisition costs, net of accumulated amortization |  |  |  | 500 | 600 |  |  |  |
Legal fee expense associated to obtaining lease |  |  |  | 1,700 |  |  |  |  |
Operating lease, impairment loss |  |  |  | 4,300 | 6,200 |  |  |  |
Impairment and closure costs |  |  |  |  | 15,000 | 4,400 |  |  |
Marketing expense |  |  |  | $ 14,300 | 14,500 | $ 9,900 |  |  |
Dividend yield |  |  |  | 0.00% |  |  |  |  |
Redeemable convertible preferred stock issued (in shares) | shares |  |  |  | 0 |  |  |  |  |
Redeemable convertible preferred stock outstanding (in shares) | shares |  |  |  | 0 |  | 0 |  |  | 62,562,051
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 | $ 1,200 |  |  |
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 |  |  |  | $ 10,700 | $ 10,900 | 7,900 |  |  |
Other restaurant operating costs |  |  |  |  |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |  |  |  |  |
Marketing expense |  |  |  | 3,100 | 2,700 | 1,800 |  |  |
Preopening costs |  |  |  |  |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |  |  |  |  |
Marketing expense |  |  |  | 500 | 1,000 | 200 |  |  |
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 |  |  |  |
Certain Of The Company’s Stores |  |  |  |  |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |  |  |  |  |
Impairment and closure costs |  |  |  |  |  | $ 4,400 |  |  |
Two Spyce store closed |  |  |  |  |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |  |  |  |  |
Number of restaurants | restaurant |  |  |  |  |  | 2 |  |  |
One Spyce store closed |  |  |  |  |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |  |  |  |  |
Number of restaurants | restaurant |  |  |  | 3 | 1 | 1 |  |  |
Impairment and closure costs |  |  |  | $ 600 | $ 500 | $ 500 |  |  |
Cumulative-effect adjustment |  |  |  |  |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |  |  |  |  |
Legal fees |  |  |  | 4,200 |  |  |  |  |
Operating lease, impairment loss |  |  |  | $ 700 |  |  |  |  |
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 |  |  |  |  |
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 |  |  |  |  | 6,800 |  |  |  |
Contract Termination |  |  |  |  |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |  |  |  |  |
Restructuring charges |  |  |  |  | 5,800 |  |  |  |
Employee Severance |  |  |  |  |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |  |  |  |  |
Severance |  |  |  |  | $ 600 |  |  |  |
New York City metropolitan area | Revenue | Geographic |  |  |  |  |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |  |  |  |  |
Concentration risk percentage |  |  |  | 28.00% | 32.00% | 33.00% |  |  |
Credit card processors |  |  |  |  |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |  |  |  |  |
Accounts receivable |  |  |  | $ 3,000 | $ 700 |  |  |  |
PSU |  |  |  |  |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |  |  |  |  |
Total stock-based compensation | $ 5,400 |  |  | $ 32,097 | 36,194 | $ 6,264 |  |  |
Vesting period |  |  |  | 1 year |  |  |  |  |
Options |  |  |  |  |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |  |  |  |  |
Total stock-based compensation |  |  |  | $ 8,878 | $ 10,505 | $ 15,414 |  |  |
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] |  |  |  |  |  |  |  |  |
Total stock-based compensation |  |  |  | $ 8,557 | $ 32,037 | $ 7,219 |  |  |
Vesting period |  | 4 years |  |  |  |  |  |  |
Series J Warrants automatically exercised |  |  |  |  |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |  |  |  |  |
Number of securities called by warrants or rights (in shares) | shares | 1,557,686 |  |  |  |  |  |  |  |
Series F Preferred Stock [Member] |  |  |  |  |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |  |  |  |  |
Number of securities called by warrants or rights (in shares) | shares |  |  |  |  |  |  | 235,000 |  |
Spyce |  |  |  |  |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |  |  |  |  |
Contingent consideration liability |  |  |  | 8,400 | 21,300 |  |  | $ 16,400 |
Spyce | PSU |  |  |  |  |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |  |  |  |  |
Total stock-based compensation |  |  |  | $ 2,400 | $ 3,400 |  |  |  |
Preferred stock automatically converted to common stock |  |  |  |  |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |  |  |  |  |
Converted common stock (in shares) | shares | 69,231,197 |  |  |  |  |  |  |  |
Class S Stock Converted To Common Stock |  |  |  |  |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |  |  |  |  |
Converted common stock (in shares) | shares | 1,316,763 |  |  |  |  |  |  |  |
Shares converted (in shares) | shares | 1,316,763 |  |  |  |  |  |  |  |
Series J Preferred Stock Converted To Common Stock | Sweetgreen, Inc. Founders |  |  |  |  |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |  |  |  |  |
Converted common stock (in shares) | shares | 13,477,303 |  |  |  |  |  |  |  |
IPO |  |  |  |  |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |  |  |  |  |
Issued and sold (in shares) | shares | 14,950,000 |  |  |  |  |  |  |  |
Shares issued (in dollars per share) | $ / shares | $ 28.00 |  |  |  |  |  |  |  |
Net proceeds | $ 384,700 |  |  |  |  |  |  |  |
Underwriting discounts and commissions | 26,400 |  |  |  |  |  |  |  |
Offering costs | $ 7,500 |  |  |  |  |  |  |  |
Common Class A |  |  |  |  |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |  |  |  |  |
Common stock, shares outstanding (in shares) | shares |  |  |  | 99,700,052 | 97,656,690 |  |  |  |
Common Class A | Series J Warrants automatically exercised |  |  |  |  |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |  |  |  |  |
Number of securities called by warrants or rights (in shares) | shares | 1,557,686 |  |  |  |  |  |  |  |
Common Class A | Preferred stock automatically converted to common stock |  |  |  |  |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |  |  |  |  |
Converted common stock (in shares) | shares | 69,231,197 |  |  |  |  |  |  |  |
Common Class A | IPO |  |  |  |  |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |  |  |  |  |
Issued and sold (in shares) | shares | 14,950,000 |  |  |  |  |  |  |  |
Shares issued (in dollars per share) | $ / shares | $ 28.00 |  |  |  |  |  |  |  |
Class S Shares | Spyce |  |  |  |  |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |  |  |  |  |
Equity interest issued (in shares) | shares |  |  | 1,843,493 |  |  |  |  |  |
Series J Warrants |  |  |  |  |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |  |  |  |  |
Change in fair value of preferred stock warrant liability | $ 14,300 |  |  |  |  |  |  |  |

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