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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
shares
Sep. 30, 2021
shares
Dec. 25, 2022
USD ($)
restaurant
hour
state
segment
reportingUnit
shares
Dec. 26, 2021
USD ($)
restaurant
shares
Dec. 27, 2020
USD ($)
shares
Nov. 22, 2022
shares
Dec. 27, 2021
USD ($)
Sep. 07, 2021
USD ($)
Feb. 28, 2021
shares
Dec. 28, 2019
shares
Dec. 31, 2016
shares
Change in Accounting Estimate [Line Items]                        
Number of restaurants | restaurant       186                
Number of states | state       16                
Number of restaurants opened | restaurant       36                
Operating segments | segment       1                
Reportable segments | segment       1                
Underwriting discounts and commissions         $ 33,900              
Common shares outstanding (in shares) | shares 92,754,432                      
Change in fair value of preferred stock warrant liability       $ 0 14,955 $ 245            
Total stock-based compensation       78,736 28,897 4,912            
Total restaurant operating costs       400,819 299,469 229,317            
Accounts receivable       3,244 2,644              
Deferred cost capitalized in enterprise resource planning       $ 5,800                
Amortization period of deferred costs       7 years                
Tenant Improvements       $ 300                
Abandoned sites and other site selection costs       900 1,200 200            
Internal costs capitalized       4,000 2,200              
Restructuring charges       14,442 0 0            
Non-cash restructuring expense       13,000                
Business exit costs       400                
Other related expenses       $ 200                
Workforce reductions percentage       5.00%                
Research and development       $ 2,000                
Number of reporting units | reportingUnit       1                
Lease term       10 years                
Accumulated amortization         4,900              
Total lease acquisition costs, net of accumulated amortization       $ 600                
Amortization expense       93 402 344            
Legal fee expense associated to obtaining lease       1,700                
Impairment and closure costs       15,000 4,400 1,500            
Marketing expense       $ 14,500 $ 9,900 $ 10,700            
Dividend yield       0.00%                
Preferred shares outstanding (in shares) | shares       0 0 62,562,051         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 $ 1,100            
Other current assets       1,654 155     $ 1,650        
Cumulative-effect adjustment                        
Change in Accounting Estimate [Line Items]                        
Legal fees       4,200                
Other current assets         1,495              
Facility Closing                        
Change in Accounting Estimate [Line Items]                        
Restructuring charges       6,800                
Employee Severance                        
Change in Accounting Estimate [Line Items]                        
Severance       600                
Abandonment of Potential Future Restaurant Sites                        
Change in Accounting Estimate [Line Items]                        
Business exit costs       600                
Contract Termination                        
Change in Accounting Estimate [Line Items]                        
Restructuring charges       5,800                
Occupancy and related expenses                        
Change in Accounting Estimate [Line Items]                        
Total restaurant operating costs       45,238 35,863 32,308            
Other restaurant operating costs                        
Change in Accounting Estimate [Line Items]                        
Total restaurant operating costs       77,971 59,539 47,164            
Revision of Prior Period, Reclassification, Adjustment | Occupancy and related expenses                        
Change in Accounting Estimate [Line Items]                        
Total restaurant operating costs       (19,800) (14,300) (11,500)            
Revision of Prior Period, Reclassification, Adjustment | Other restaurant operating costs                        
Change in Accounting Estimate [Line Items]                        
Total restaurant operating costs       19,800 14,300 11,500            
General and Administrative Expense                        
Change in Accounting Estimate [Line Items]                        
Marketing expense       10,900 7,900 8,000            
Other restaurant operating costs                        
Change in Accounting Estimate [Line Items]                        
Marketing expense       2,700 1,800 2,400            
Preopening costs                        
Change in Accounting Estimate [Line Items]                        
Marketing expense       1,000 200 300            
Restructuring charges                        
Change in Accounting Estimate [Line Items]                        
Impairment and closure costs       $ 12,600                
Impairment, Long-Lived Asset, Held-for-Use, Statement of Income or Comprehensive Income [Extensible Enumeration]       Restructuring charges                
Impairment and closure costs                        
Change in Accounting Estimate [Line Items]                        
Impairment and closure costs       $ 2,400                
Impairment, Long-Lived Asset, Held-for-Use, Statement of Income or Comprehensive Income [Extensible Enumeration]       Impairment and closure costs                
Series J Warrants                        
Change in Accounting Estimate [Line Items]                        
Number of securities called by warrants or rights (in shares) | shares   235,000               2,000,715   235,000
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                        
Change in Accounting Estimate [Line Items]                        
Number of securities called by warrants or rights (in shares) | shares             235,000          
Certain Of The Company’s Stores                        
Change in Accounting Estimate [Line Items]                        
Impairment and closure costs         $ 4,400 $ 1,500            
Certain Of The Company’s Stores | Restructuring charges                        
Change in Accounting Estimate [Line Items]                        
Impairment, Long-Lived Asset, Held-for-Use, Statement of Income or Comprehensive Income [Extensible Enumeration]       Restructuring charges                
Certain Of The Company’s Stores | Impairment and closure costs                        
Change in Accounting Estimate [Line Items]                        
Impairment, Long-Lived Asset, Held-for-Use, Statement of Income or Comprehensive Income [Extensible Enumeration]       Impairment and closure costs                
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, Long-Lived Asset, Held-for-Use, Statement of Income or Comprehensive Income [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, Long-Lived Asset, Held-for-Use, Statement of Income or Comprehensive Income [Extensible Enumeration]       Impairment and closure costs                
Vacated Sweetgreen Support Center                        
Change in Accounting Estimate [Line Items]                        
Impairment and closure costs       $ 6,800                
Impairment, Long-Lived Asset, Held-for-Use, Statement of Income or Comprehensive Income [Extensible Enumeration]       Restructuring charges                
Vacated Sweetgreen Support Center | Restructuring charges                        
Change in Accounting Estimate [Line Items]                        
Impairment and closure costs       $ 5,800                
Impairment, Long-Lived Asset, Held-for-Use, Statement of Income or Comprehensive Income [Extensible Enumeration]       Restructuring charges                
Vacated Sweetgreen Support Center | Impairment and closure costs                        
Change in Accounting Estimate [Line Items]                        
Impairment and closure costs       $ 400                
Impairment, Long-Lived Asset, Held-for-Use, Statement of Income or Comprehensive Income [Extensible Enumeration]       Impairment and closure costs                
Property Subject to Operating Lease                        
Change in Accounting Estimate [Line Items]                        
Impairment and closure costs       $ 6,200                
Property Subject to Operating Lease | Restructuring charges                        
Change in Accounting Estimate [Line Items]                        
Impairment and closure costs       $ 5,800                
Impairment, Long-Lived Asset, Held-for-Use, Statement of Income or Comprehensive Income [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, Long-Lived Asset, Held-for-Use, Statement of Income or Comprehensive Income [Extensible Enumeration]       Impairment and closure costs                
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       1 1              
Impairment and closure costs       $ 500 $ 500              
One Spyce store closed | Restructuring charges                        
Change in Accounting Estimate [Line Items]                        
Impairment and closure costs       $ 400                
Impairment, Long-Lived Asset, Held-for-Use, Statement of Income or Comprehensive Income [Extensible Enumeration]       Restructuring charges                
One Spyce store closed | Impairment and closure costs                        
Change in Accounting Estimate [Line Items]                        
Impairment and closure costs       $ 100                
Impairment, Long-Lived Asset, Held-for-Use, Statement of Income or Comprehensive Income [Extensible Enumeration]       Impairment and closure costs                
Certain Store Locations                        
Change in Accounting Estimate [Line Items]                        
Impairment and closure costs       $ 2,000                
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                
Recurring                        
Change in Accounting Estimate [Line Items]                        
Contingent consideration liability       $ 21,296 20,477              
Level 3 | Recurring                        
Change in Accounting Estimate [Line Items]                        
Contingent consideration liability       $ 21,296 $ 20,477              
New York City metropolitan area | Geographic | Revenue                        
Change in Accounting Estimate [Line Items]                        
Concentration risk percentage       32.00% 33.00% 39.00%            
Credit card processors                        
Change in Accounting Estimate [Line Items]                        
Accounts receivable       $ 700 $ 1,100              
PSU                        
Change in Accounting Estimate [Line Items]                        
Total stock-based compensation $ 5,400     $ 36,194 6,264 $ 0            
Vesting period       1 year                
Options                        
Change in Accounting Estimate [Line Items]                        
Total stock-based compensation       $ 10,505 $ 15,414 $ 4,912            
Dividend yield       0.00% 0.00% 0.00%            
RSUs                        
Change in Accounting Estimate [Line Items]                        
Total stock-based compensation       $ 32,037 $ 7,219 $ 0            
Vesting period   4 years                    
Common Stock                        
Change in Accounting Estimate [Line Items]                        
Common shares outstanding (in shares) | shares       111,132,993 109,345,697 16,731,625         15,340,159  
Series J Warrants                        
Change in Accounting Estimate [Line Items]                        
Change in fair value of preferred stock warrant liability $ 14,300                      
Common Class B                        
Change in Accounting Estimate [Line Items]                        
Common shares outstanding (in shares) | shares       13,476,303 13,477,303              
Common Class A                        
Change in Accounting Estimate [Line Items]                        
Common shares outstanding (in shares) | shares       97,656,690 95,868,394              
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                      
Spyce                        
Change in Accounting Estimate [Line Items]                        
Contingent consideration liability       $ 21,300 $ 20,500       $ 16,400      
Spyce | PSU                        
Change in Accounting Estimate [Line Items]                        
Total stock-based compensation       $ 3,400 $ 1,000              
Spyce | Class S Shares                        
Change in Accounting Estimate [Line Items]                        
Equity interest issued (in shares) | shares     1,843,493                  
Preferred stock automatically converted to common stock                        
Change in Accounting Estimate [Line Items]                        
Converted common stock (in shares) | shares 69,231,197                      
Preferred stock automatically converted to common stock | Common Class A                        
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                      
IPO | Common Class A                        
Change in Accounting Estimate [Line Items]                        
Issued and sold (in shares) | shares 14,950,000                      
Shares issued (in dollars per share) | $ / shares $ 28.00