Cover - shares	9 Months Ended
	Sep. 29, 2024	Nov. 05, 2024
Entity Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 29, 2024
Document Transition Report	false
Entity File Number	001-41069
Entity Registrant Name	SWEETGREEN, INC.
Entity Incorporation, State or Country Code	DE
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
Title of 12(b) Security	Class A Common Stock
Trading Symbol	SG
Security Exchange Name	NYSE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Central Index Key	0001477815
Amendment Flag	false
Current Fiscal Year End Date	--12-29
Document Fiscal Year Focus	2024
Document Fiscal Period Focus	Q3
Class A common stock
Entity Information [Line Items]
Entity Common Stock, Shares Outstanding		103,413,793
Class B common stock
Entity Information [Line Items]
Entity Common Stock, Shares Outstanding		12,256,999