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BUSINESS ACQUISITION - Supplemental Unaudited Pro Forma Information (Details) - Spyce - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 27, 2021	Jun. 27, 2021
Business Acquisition [Line Items]
Revenue	$ 86,522	$ 148,073
Net loss attributable to Sweetgreen, Inc.	$ (27,401)	$ (58,345)

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(3)
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- Definition

The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period.

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-Name Accounting Standards Codification
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-URI https://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463

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-Name Accounting Standards Codification
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