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DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details)
 3 Months Ended 9 Months Ended
Sep. 24, 2023
USD ($)
restaurant
state
Sep. 25, 2022
USD ($)
Sep. 24, 2023
USD ($)
segment
state
restaurant
Sep. 25, 2022
USD ($)
Dec. 25, 2022
USD ($)
Change in Accounting Estimate [Line Items]          
Number of restaurants | restaurant 220   220    
Number of states | state 18   18    
Number of restaurants opened | restaurant 15   34    
Operating segments | segment     1    
Reportable segments | segment     1    
Total restaurant operating costs $ 124,315,000 $ 104,097,000 $ 353,876,000 $ 295,072,000  
Non-cash impairment 4,300,000        
Impairment charges   14,300,000   14,300,000  
Non-cash impairment charges   8,527,000   8,527,000  
Operating lease assets, impairment losses 0 5,840,000 4,291,000 5,840,000  
Impairment and closure costs 132,000 $ 1,722,000 479,000 $ 1,921,000  
Workforce reductions percentage   5.00%   5.00%  
Other restructuring costs   $ 500,000   $ 500,000  
Contingent consideration liability 22,887,000   22,887,000   $ 21,296,000
Accounts receivable 9,891,000   9,891,000   3,244,000
Federal deposit insurance corporation (up to)     250,000    
Deferred costs $ 4,400,000   $ 4,400,000    
Amortization period of deferred costs     7 years    
New York City Metropolitan Area | Revenue | Geographic          
Change in Accounting Estimate [Line Items]          
Concentration risk percentage 28.00% 32.00% 29.00% 32.00%  
Credit Card Processors          
Change in Accounting Estimate [Line Items]          
Accounts receivable $ 2,800,000   $ 2,800,000   $ 700,000
Spyce          
Change in Accounting Estimate [Line Items]          
Contingent consideration liability 16,400,000   16,400,000    
Contingent consideration liability 22,900,000   22,900,000    
One Spyce Store Closed          
Change in Accounting Estimate [Line Items]          
Non-cash impairment and closure costs $ 100,000 $ 100,000 $ 500,000 $ 200,000  
Corporate Closed Store          
Change in Accounting Estimate [Line Items]          
Number of restaurants | restaurant 3   3    
Vacated Sweetgreen Support Center          
Change in Accounting Estimate [Line Items]          
Impairment and closure costs       6,800,000  
Certain Store Locations          
Change in Accounting Estimate [Line Items]          
Impairment and closure costs       1,700,000  
Employee Severance          
Change in Accounting Estimate [Line Items]          
Severance and related benefits costs   600,000   600,000  
Abandonment Of Potential Future Restaurant Sites          
Change in Accounting Estimate [Line Items]          
Business exit costs   600,000   600,000  
Other restaurant operating costs          
Change in Accounting Estimate [Line Items]          
Total restaurant operating costs $ 24,850,000 20,113,000 $ 68,920,000 57,103,000  
Other restaurant operating costs | Revision of Prior Period, Reclassification, Adjustment          
Change in Accounting Estimate [Line Items]          
Total restaurant operating costs   5,600,000   14,400,000  
Occupancy and related expenses          
Change in Accounting Estimate [Line Items]          
Total restaurant operating costs $ 13,961,000 11,504,000 $ 40,117,000 33,171,000  
Occupancy and related expenses | Revision of Prior Period, Reclassification, Adjustment          
Change in Accounting Estimate [Line Items]          
Total restaurant operating costs   $ (5,600,000)   $ (14,400,000)