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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 12 Months Ended
Sep. 27, 2023
Jun. 28, 2023
Mar. 29, 2023
Sep. 28, 2022
Jun. 29, 2022
Mar. 30, 2022
Dec. 27, 2023
Dec. 28, 2022
Dec. 29, 2021
Numerator:                  
Net income (loss) attributable to Shake Shack Inc.—basic $ 7,627 $ 6,948 $ (1,534) $ (2,024) $ (1,188) $ (10,162) $ 20,264 $ (21,229) $ (4,561)
Reallocation of net income attributable to non-controlling interests from the assumed conversion of Class B shares $ 509 $ 275 $ (88) $ (287) $ (115) $ (1,120) 726 (1,876) (1,456)
Net income (loss) attributable to Shake Shack Inc.—diluted             $ 20,990 $ (21,229) $ (4,561)
Denominator:                  
Weighted average shares of Class A common stock outstanding—basic 39,460 39,416 39,332 39,274 39,227 39,163 39,419 39,237 39,085
Effect of dilutive securities:                  
Weighted average shares of Class A common stock outstanding—diluted 43,978 43,886 39,332 39,274 39,227 39,163 43,899 39,237 39,085
Earnings per share of Class A common stock—basic (in dollars per share) $ 0.19 $ 0.18 $ (0.04) $ (0.05) $ (0.03) $ (0.26) $ 0.51 $ (0.54) $ (0.12)
Earnings per share of Class A common stock—diluted (in dollars per share) $ 0.19 $ 0.16 $ (0.04) $ (0.05) $ (0.03) $ (0.26) $ 0.48 $ (0.54) $ (0.12)
Performance stock units                  
Effect of dilutive securities:                  
Incremental common shares (in shares)             11 0 0
Restricted stock units                  
Effect of dilutive securities:                  
Incremental common shares (in shares)             85 0 0
Convertible Notes                  
Effect of dilutive securities:                  
Incremental common shares (in shares)             1,467 0 0
Class B Common Stock                  
Numerator:                  
Reallocation of net income attributable to non-controlling interests from the assumed conversion of Class B shares             $ 726 $ 0 $ 0
Effect of dilutive securities:                  
Incremental common shares (in shares)             2,842 0 0
Stock options                  
Effect of dilutive securities:                  
Incremental common shares (in shares)             75 0 0