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NON-CONTROLLING INTERESTS - Changes in Ownership Interests in SSE Holdings (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 27, 2017
Sep. 28, 2016
Sep. 27, 2017
Sep. 28, 2016
Noncontrolling Interest [Line Items]        
Net Income (Loss) Attributable to Parent $ 4,997 $ 3,766 $ 12,143 $ 8,526
Net unrealized losses related to available-for-sale securities 67 (8) 64 (16)
Total effect of changes in ownership interest on equity attributable to Shake Shack Inc. 5,963 8,486 18,651 24,023
Redemption or Exchange of Units        
Noncontrolling Interest [Line Items]        
Increase (decrease) in additional paid-in capital 841 4,708 2,883 15,086
Employee Stock Option        
Noncontrolling Interest [Line Items]        
Increase (decrease) in additional paid-in capital 78 17 3,580 421
Accumulated Other Comprehensive Loss        
Noncontrolling Interest [Line Items]        
Net unrealized losses related to available-for-sale securities $ 47 $ (5) $ 45 $ (10)