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EARNINGS PER SHARE - Schedule of Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 25, 2020
Numerator:    
NET INCOME (LOSS) ATTRIBUTABLE TO SHAKE SHACK INC. $ 1,309 $ (960)
Reallocation of net loss attributable to non-controlling interests from the assumed conversion of Class B shares $ (734) $ (119)
Denominator:    
Weighted-average shares of Class A common stock outstanding—basic (in shares) 38,948 34,444
Effect of dilutive securities:    
Weighted-average shares of Class A common stock outstanding—diluted (in shares) 42,789 34,444
Earnings per share of Class A common stock—basic (in dollars per share) $ 0.03 $ (0.03)
Earnings per share of Class A common stock—diluted (in dollars per share) $ 0.01 $ (0.03)
Performance stock units    
Effect of dilutive securities:    
Stock options (in shares) 53 0
Restricted stock units    
Effect of dilutive securities:    
Stock options (in shares) 164 0
Convertible Notes    
Effect of dilutive securities:    
Stock options (in shares) 451 0
Class B Common Stock    
Numerator:    
Reallocation of net loss attributable to non-controlling interests from the assumed conversion of Class B shares $ (734) $ 0
Effect of dilutive securities:    
Stock options (in shares) 2,941 0
Stock options    
Effect of dilutive securities:    
Stock options (in shares) 232 0