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SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED) (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 11 Months Ended 12 Months Ended
Feb. 03, 2015
Dec. 28, 2016
Sep. 28, 2016
Jun. 29, 2016
Mar. 30, 2016
Dec. 30, 2015
Sep. 30, 2015
Jul. 01, 2015
Apr. 01, 2015
Dec. 30, 2015
Dec. 28, 2016
Dec. 30, 2015
Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract]                          
Total revenue   $ 73,271 $ 74,567 $ 66,472 $ 54,165 $ 51,061 $ 53,273 $ 48,450 $ 37,808   $ 268,475 $ 190,592 $ 118,530
Operating income   4,988 9,170 8,933 4,714 3,654 7,804 6,244 (10,949)   27,805 6,753 3,143
Net income $ (13,049) 5,457 6,789 6,549 3,351 3,046 6,193 5,145 (11,260) $ 16,173 22,146 3,124 2,118
Net income attributable to Shake Shack Inc.   $ 3,920 $ 3,766 $ 3,298 $ 1,462 $ 1,246 $ 1,528 $ 1,118 $ (12,668)   $ 12,446 $ (8,776) $ 2,118
Earnings (loss) per share                          
Basic (in dollars per share)   $ 0.16 $ 0.16 $ 0.15 $ 0.07 $ 0.08 $ 0.11 $ 0.09 $ (1.06)        
Diluted (in dollars per share)   $ 0.15 $ 0.15 $ 0.14 $ 0.07 $ 0.07 $ 0.10 $ 0.08 $ (1.06)        
Fiscal period duration                     364 days 364 days 371 days