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EARNINGS PER SHARE - Schedule of Earnings (Loss) Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 25, 2024
Dec. 27, 2023
Numerator:      
Net income attributable to Shake Shack Inc.—basic $ 45,725 $ 10,207 $ 20,264
Reallocation of net income attributable to non-controlling interests from the assumed conversion of Class B shares 3,981 613 726
Net income attributable to Shake Shack Inc.—diluted $ 45,725 $ 10,820 $ 20,990
Denominator:      
Weighted average shares of Class A common stock outstanding—basic 40,212 39,830 39,419
Effect of dilutive securities:      
Weighted average shares of Class A common stock outstanding—diluted 41,847 44,203 43,899
Earnings per share of Class A common stock—basic (in dollars per share) $ 1.14 $ 0.26 $ 0.51
Earnings per share of Class A common stock—diluted (in dollars per share) $ 1.09 $ 0.24 $ 0.48
Performance stock units      
Effect of dilutive securities:      
Incremental common shares (in shares) 35 69 11
Restricted stock units      
Effect of dilutive securities:      
Incremental common shares (in shares) 131 173 85
Convertible Notes      
Effect of dilutive securities:      
Incremental common shares (in shares) 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 $ 613 $ 726
Effect of dilutive securities:      
Incremental common shares (in shares) 0 2,612 2,842
Stock options      
Effect of dilutive securities:      
Incremental common shares (in shares) 2 52 75