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NON-CONTROLLING INTERESTS - Redemption of LLC Interests (Details) - shares	3 Months Ended						12 Months Ended
	Sep. 27, 2023	Jun. 28, 2023	Mar. 29, 2023	Sep. 28, 2022	Jun. 29, 2022	Mar. 30, 2022	Dec. 27, 2023	Dec. 28, 2022	Dec. 29, 2021
Limited Liability Company
Class of Stock [Line Items]
Number of LLC Interests received by Shake Shack Inc. (in shares)							189,317
Number of units redeemed (in shares)							35,000	52,074	29,601
Stock options
Class of Stock [Line Items]
Number of LLC Interests received by Shake Shack Inc. (in shares)							154,317	90,527	395,006
Redemptions by NCI Holders | Limited Liability Company
Class of Stock [Line Items]
Number of units redeemed (in shares)							35,000	52,074	29,601
Common stock | Class A Common Stock
Class of Stock [Line Items]
Shares of Class A common stock issued in connection with redemptions of LLC Interests (in shares)	10,000	0	25,000	2,000	40,074	10,000	35,000	52,074	29,601
Common stock | Class B Common Stock
Class of Stock [Line Items]
Shares of Class A common stock issued in connection with redemptions of LLC Interests (in shares)	(10,000)	0	(25,000)	(2,000)	(40,074)	(10,000)	(35,000)	(52,074)	(29,601)
Shares of Class B common stock surrendered and canceled (in shares)							35,000	52,074	29,601

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