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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 |  |  |

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