v3.26.1
EARNINGS PER SHARE - Schedule of Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jul. 01, 2026
Jun. 25, 2025
Jul. 01, 2026
Jun. 25, 2025
Numerator:        
Net income attributable to Shake Shack Inc.—basic $ 15,680 $ 17,148 $ 15,390 $ 21,393
Net income attributable to Shake Shack Inc.—diluted $ 15,680 $ 17,148 $ 15,390 $ 21,393
Denominator:        
Weighted average shares of Class A common stock outstanding—basic 40,358 40,226 40,323 40,173
Effect of dilutive securities:        
Weighted average shares of Class A common stock outstanding—diluted 41,866 41,819 41,873 41,842
Earnings per share of Class A common stock—basic (in dollars per share) $ 0.39 $ 0.43 $ 0.38 $ 0.53
Earnings per share of Class A common stock—diluted (in dollars per share) $ 0.37 $ 0.41 $ 0.37 $ 0.51
Stock options        
Effect of dilutive securities:        
Incremental common shares (in shares) 1 2 1 3
Performance stock units        
Effect of dilutive securities:        
Incremental common shares (in shares) 6 23 15 53
Restricted stock units        
Effect of dilutive securities:        
Incremental common shares (in shares) 34 101 67 146
Convertible Notes        
Effect of dilutive securities:        
Incremental common shares (in shares) 1,467 1,467 1,467 1,467