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COMMON STOCK - Narrative (Details)
Nov. 22, 2021
vote
$ / shares
Dec. 28, 2025
shares
Dec. 29, 2024
shares
Class of Stock [Line Items]      
Death or permanent disability of founder 1 year    
IPO      
Class of Stock [Line Items]      
Shares issued (in dollars per share) | $ / shares $ 28.00    
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]      
Conversion ratio 1    
Common Class B      
Class of Stock [Line Items]      
Votes per share | vote 10    
Common stock, shares outstanding (in shares) | shares   11,893,558 11,915,758
Common Class A      
Class of Stock [Line Items]      
Votes per share | vote 1    
Common stock, shares outstanding (in shares) | shares   106,554,859 105,200,553