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REVENUE RECOGNITION - Schedule of Contract with Customer, Contract Asset, Contract Liability, and Receivable (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 27, 2022	Mar. 28, 2021	Dec. 26, 2021
Disaggregation of Revenue [Line Items]
Current portion of deferred rent liability	$ 1,622		$ 1,839
Gift Cards
Disaggregation of Revenue [Line Items]
Current portion of deferred rent liability	1,622		$ 1,839
Revenue recognized from gift card liability balance at the beginning of the year	253	$ 131
Sweetgreen Rewards
Contract With Customer, Liability [Roll Forward]
sweetgreen Rewards liability, beginning balance	0	943
Revenue deferred	0	1,701
Revenue recognized	0	(2,208)
sweetgreen Rewards liability, ending balance	$ 0	$ 436

X

- Definition

Contract With Customer, Liability, Increase For Contract Acquired

+ References

No definition available.

+ Details

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X

- Definition

Contract With Customer, Liability, Revenue Deferred And Recognized

+ References

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- Definition

Contract With Customer, Liability

+ References

No definition available.

+ Details

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X

- Definition

Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=123360276&loc=SL49130531-203044

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130549-203045

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section 45
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-URI http://asc.fasb.org/extlink&oid=123360276&loc=SL49130532-203044

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X

- Definition

Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as current.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=123360276&loc=SL49130531-203044

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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-Publisher FASB
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-URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130549-203045

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- Definition

Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due.

+ References

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-Publisher FASB
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-Paragraph 8
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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.

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