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FAIR VALUE - Narrative (Details)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 07, 2021
milestone
$ / shares
shares
Sep. 24, 2023
USD ($)
$ / shares
shares
Sep. 25, 2022
USD ($)
Sep. 24, 2023
USD ($)
$ / shares
shares
Sep. 25, 2022
USD ($)
Jun. 25, 2023
USD ($)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Change in fair value of contingent consideration liability       $ 1,591 $ (2,155)  
Performance based milestone targets | milestone 3          
Operating lease assets, impairment losses   $ 0 $ 5,840 4,291 5,840  
Impairment charges     14,300   14,300  
Non-cash impairment charges     8,527   8,527  
Impairment and closure costs   132 $ 1,722 479 1,921  
Vacated Sweetgreen Support Center            
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Impairment and closure costs         6,800  
Certain Store Locations            
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Impairment and closure costs         $ 1,700  
IPO            
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Shares issued (in dollars per share) | $ / shares $ 28.00          
Spyce            
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Additional shares issued (in shares) | shares 714,285          
Covenant, acquisition company share holders (in shares) | shares 1,316,763          
Contingent consideration liability   $ 16,400   $ 16,400    
Spyce | Former Equity Holders, Additional Equity            
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Upfront portion (in dollars per share) | $ / shares   $ 13.62   $ 13.62    
Change in fair value of contingent consideration liability       $ 10,200    
Acquisition company share holders, not continuously held (in shares) | shares   570,249   570,249    
Contingent consideration liability           $ 8,900