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BUSINESS ACQUISITION - Schedule of Unaudited Pro Forma Information (Details) - Spyce - USD ($)
$ in Thousands
12 Months Ended
Dec. 26, 2021
Dec. 27, 2020
Business Acquisition [Line Items]    
Revenue $ 340,807 $ 220,651
Net loss attributable to Sweetgreen, Inc. $ (156,050) $ (147,777)