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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