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NON-CONTROLLING INTERESTS - Changes in Ownership Interests in SSE Holdings (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 25, 2020
Noncontrolling Interest [Line Items]    
Net income (loss) attributable to Shake Shack Inc. $ 1,309 $ (960)
Other comprehensive income:    
Net change related to available-for-sale securities (1) 1
Transfers (to) from non-controlling interests:    
Total effect of changes in ownership interest on equity attributable to Shake Shack Inc. 4,704 (341)
Redemption or Exchange of Units    
Transfers (to) from non-controlling interests:    
Increase (decrease) in additional paid-in capital 36 195
Employee Stock Option    
Transfers (to) from non-controlling interests:    
Increase (decrease) in additional paid-in capital $ 3,359 $ 424