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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