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EARNINGS PER SHARE - Schedule of Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ 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
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net income	$ (548)	$ 6,946	$ 10,571	$ 4,979	$ (11,032)	$ 7,870	$ 8,184	$ 3,682	$ 21,948	$ 8,884	$ 22,146
Less: net income attributable to non-controlling interests									6,769	9,204	9,700
Net income (loss) 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
Denominator:
Weighted-average shares of Class A common stock outstanding—basic (shares)									28,299	25,876	22,956
Effect of dilutive securities:
Weighted-average shares of Class A common stock outstanding—diluted (shares)									29,179	25,876	23,449
Earnings per share of Class A common stock—basic (in dollars per share)									$ 0.54	$ (0.01)	$ 0.54
Earnings per share of Class A common stock—diluted (in dollars per share)									$ 0.52	$ (0.01)	$ 0.53
Stock options
Effect of dilutive securities:
Restricted Class B units (shares)									798	0	491
Performance Shares
Effect of dilutive securities:
Restricted Class B units (shares)									63		2
Restricted Stock [Member]
Effect of dilutive securities:
Restricted Class B units (shares)									19

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