| Cover Page | Dec. 06, 2022 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Document Period End Date | Dec. 06, 2022 |
| Entity Registrant Name | SWEETGREEN, INC. |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 001-41069 |
| Entity Tax Identification Number | 27-1159215 |
| Entity Address, Address Line One | 3102 36th Street |
| Entity Address, City or Town | Los Angeles, |
| Entity Address, State or Province | CA |
| Entity Address, Postal Zip Code | 90018 |
| City Area Code | 323 |
| Local Phone Number | 990-7040 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Class A Common Stock, $0.001 par value per share |
| Trading Symbol | SG |
| Security Exchange Name | NYSE |
| Entity Emerging Growth Company | true |
| Entity Ex Transition Period | false |
| Entity Central Index Key | 0001477815 |
| Amendment Flag | false |
