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COMMON STOCK - Narrative (Details)
$ / shares in Units, $ in Millions
 1 Months Ended
Nov. 22, 2021
USD ($)
vote
$ / shares
shares
Sep. 30, 2021
shares
Dec. 25, 2022
shares
Dec. 26, 2021
shares
Class of Stock [Line Items]        
Death or permanent disability of founder 1 year      
Common stock, shares outstanding (in shares) 92,754,432      
Series J Warrants automatically exercised        
Class of Stock [Line Items]        
Number of securities called by warrants or rights (in shares) 1,557,686      
IPO        
Class of Stock [Line Items]        
Issued and sold (in shares) 14,950,000      
Shares issued (in dollars per share) | $ / shares $ 28.00      
Net proceeds | $ $ 384.7      
Preferred stock automatically converted to common stock        
Class of Stock [Line Items]        
Converted common stock (in shares) 69,231,197      
Class S Stock Converted To Common Stock        
Class of Stock [Line Items]        
Converted common stock (in shares) 1,316,763      
Class B Common Stock Converted To Class A Common Stock        
Class of Stock [Line Items]        
Death or permanent disability of founder 9 months      
Registration statement for the company’s IPO occurs 10 years      
Sweetgreen, Inc. Founders | Series J Preferred Stock Converted To Common Stock        
Class of Stock [Line Items]        
Converted common stock (in shares) 13,477,303      
Conversion ratio 1      
Common Class B        
Class of Stock [Line Items]        
Votes per share | vote 10      
Common stock, shares outstanding (in shares)     13,476,303 13,477,303
Common Class A        
Class of Stock [Line Items]        
Votes per share | vote 1      
Common stock, shares outstanding (in shares)     97,656,690 95,868,394
Common Class A | Series J Warrants automatically exercised        
Class of Stock [Line Items]        
Number of securities called by warrants or rights (in shares) 1,557,686      
Common Class A | IPO        
Class of Stock [Line Items]        
Issued and sold (in shares) 14,950,000      
Shares issued (in dollars per share) | $ / shares $ 28.00      
Common Class A | Preferred stock automatically converted to common stock        
Class of Stock [Line Items]        
Converted common stock (in shares) 69,231,197      
Class S Shares | Spyce        
Class of Stock [Line Items]        
Equity interest issued (in shares)   1,843,493