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EARNINGS (LOSS) PER SHARE - Schedule of Earnings (Loss) Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 26, 2024
Jun. 28, 2023
Jun. 26, 2024
Jun. 28, 2023
Numerator:        
Net income attributable to Shake Shack Inc.—basic $ 9,668 $ 6,948 $ 11,708 $ 5,414
Reallocation of net income attributable to non-controlling interests from the assumed conversion of Class B shares 714 275 888 187
Net income attributable to Shake Shack Inc.—diluted $ 9,668 $ 7,223 $ 11,708 $ 5,601
Denominator:        
Weighted average shares of Class A common stock outstanding—basic 39,750 39,416 39,632 39,374
Effect of dilutive securities:        
Weighted average shares of Class A common stock outstanding—diluted 41,480 43,886 41,369 43,837
Earnings per share of Class A common stock—basic (in dollars per share) $ 0.24 $ 0.18 $ 0.30 $ 0.14
Earnings per share of Class A common stock—diluted (in dollars per share) $ 0.23 $ 0.16 $ 0.28 $ 0.13
Performance stock units        
Effect of dilutive securities:        
Incremental common shares (in shares) 63 6 39 11
Restricted stock units        
Effect of dilutive securities:        
Incremental common shares (in shares) 140 73 166 58
Convertible Notes        
Effect of dilutive securities:        
Incremental common shares (in shares) 1,467 1,467 1,467 1,467
Class B Common Stock        
Numerator:        
Reallocation of net income attributable to non-controlling interests from the assumed conversion of Class B shares $ 0 $ 275 $ 0 $ 187
Effect of dilutive securities:        
Incremental common shares (in shares) 0 2,845 0 2,848
Stock options        
Effect of dilutive securities:        
Incremental common shares (in shares) 60 79 65 79