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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		9 Months Ended
	Sep. 27, 2017	Sep. 28, 2016	Sep. 27, 2017	Sep. 28, 2016
Numerator:
Document period end date			Sep. 27, 2017
Net income	$ 7,870	$ 6,789	$ 19,916	$ 16,689
Less: net income attributable to non-controlling interests	2,873	3,023	7,773	8,163
NET INCOME ATTRIBUTABLE TO SHAKE SHACK INC.	$ 4,997	$ 3,766	$ 12,143	$ 8,526
Denominator:
Weighted-average shares of Class A common stock outstanding—basic (in shares)	26,024	24,023	25,733	22,310
Effect of dilutive securities:
Weighted-average shares of Class A common stock outstanding—diluted (in shares)	26,477	24,554	26,248	22,805
Earnings (loss) per share of Class A common stock—basic (in dollars per share)	$ 0.19	$ 0.16	$ 0.47	$ 0.38
Earnings (loss) per share of Class A common stock—diluted (in dollars per share)	$ 0.19	$ 0.15	$ 0.46	$ 0.37
Performance stock units
Effect of dilutive securities:
Stock options (in shares)	26	0	24	0
Restricted Stock Units (RSUs) [Member]
Effect of dilutive securities:
Stock options (in shares)	16	0	5	0
Employee Stock Option
Effect of dilutive securities:
Stock options (in shares)	411	531	486	495

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