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SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED) (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 30, 2020	Sep. 23, 2020	Jun. 24, 2020	Mar. 25, 2020	Dec. 25, 2019	Sep. 25, 2019	Jun. 26, 2019	Mar. 27, 2019
Quarterly Financial Information Disclosure [Abstract]
TOTAL REVENUE	$ 157,510	$ 130,401	$ 91,786	$ 143,170	$ 151,435	$ 157,762	$ 152,713	$ 132,609
Operating loss	(12,216)	(6,798)	(24,075)	(787)	488	8,164	11,871	5,162
Net income	(20,314)	(6,110)	(18,031)	(1,079)	(2,073)	11,423	11,171	3,607
Net income attributable to Shake Shack Inc.	$ (19,428)	$ (5,559)	$ (16,211)	$ (960)	$ (2,093)	$ 10,344	$ 9,030	$ 2,546
Earnings (loss) per share
Basic (in dollars per share)	$ (0.50)	$ (0.15)	$ (0.43)	$ (0.03)	$ (0.06)	$ 0.32	$ 0.30	$ 0.09
Diluted (in dollars per share)	$ (0.50)	$ (0.15)	$ (0.43)	$ (0.03)	$ (0.06)	$ 0.31	$ 0.29	$ 0.08

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