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SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 26, 2018	Sep. 26, 2018	Jun. 27, 2018	Mar. 28, 2018	Dec. 27, 2017	Sep. 27, 2017	Jun. 28, 2017	Mar. 29, 2017	Dec. 26, 2018	Dec. 27, 2017	Dec. 28, 2016
Quarterly Financial Information Disclosure [Abstract]
TOTAL REVENUE	$ 124,265	$ 119,647	$ 116,282	$ 99,116	$ 96,136	$ 94,609	$ 91,316	$ 76,749	$ 459,310	$ 358,810	$ 268,475
Operating income	2,836	9,343	13,018	6,514	5,838	10,610	11,737	5,628	31,711	33,813	27,805
Net income	(548)	6,946	10,571	4,979	(11,032)	7,870	8,184	3,682	21,948	8,884	22,146
Net income attributable to Shake Shack Inc.	$ (958)	$ 5,025	$ 7,604	$ 3,508	$ (12,463)	$ 4,997	$ 4,879	$ 2,267	$ 15,179	$ (320)	$ 12,446
Earnings (loss) per share
Basic (in dollars per share)	$ (0.03)	$ 0.17	$ 0.27	$ 0.13	$ (0.47)	$ 0.19	$ 0.19	$ 0.09
Diluted (in dollars per share)	$ (0.03)	$ 0.17	$ 0.26	$ 0.13	$ (0.47)	$ 0.19	$ 0.19	$ 0.09

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