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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