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SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED) (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	3 Months Ended								11 Months Ended	12 Months Ended
	Feb. 03, 2015	Dec. 28, 2016	Sep. 28, 2016	Jun. 29, 2016	Mar. 30, 2016	Dec. 30, 2015	Sep. 30, 2015	Jul. 01, 2015	Apr. 01, 2015	Dec. 30, 2015	Dec. 28, 2016	Dec. 30, 2015	Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract]
Total revenue		$ 73,271	$ 74,567	$ 66,472	$ 54,165	$ 51,061	$ 53,273	$ 48,450	$ 37,808		$ 268,475	$ 190,592	$ 118,530
Operating income		4,988	9,170	8,933	4,714	3,654	7,804	6,244	(10,949)		27,805	6,753	3,143
Net income	$ (13,049)	5,457	6,789	6,549	3,351	3,046	6,193	5,145	(11,260)	$ 16,173	22,146	3,124	2,118
Net income attributable to Shake Shack Inc.		$ 3,920	$ 3,766	$ 3,298	$ 1,462	$ 1,246	$ 1,528	$ 1,118	$ (12,668)		$ 12,446	$ (8,776)	$ 2,118
Earnings (loss) per share
Basic (in dollars per share)		$ 0.16	$ 0.16	$ 0.15	$ 0.07	$ 0.08	$ 0.11	$ 0.09	$ (1.06)
Diluted (in dollars per share)		$ 0.15	$ 0.15	$ 0.14	$ 0.07	$ 0.07	$ 0.10	$ 0.08	$ (1.06)
Fiscal period duration											364 days	364 days	371 days

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