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NON-CONTROLLING INTERESTS - Redemption of LLC Interests (Details) - shares
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
Limited Liability Company                  
Class of Stock [Line Items]                  
Number of LLC Interests received by Shake Shack Inc. (in shares)             189,317    
Number of units redeemed (in shares)             35,000 52,074 29,601
Stock options                  
Class of Stock [Line Items]                  
Number of LLC Interests received by Shake Shack Inc. (in shares)             154,317 90,527 395,006
Redemptions by NCI Holders | Limited Liability Company                  
Class of Stock [Line Items]                  
Number of units redeemed (in shares)             35,000 52,074 29,601
Common stock | Class A Common Stock                  
Class of Stock [Line Items]                  
Shares of Class A common stock issued in connection with redemptions of LLC Interests (in shares) 10,000 0 25,000 2,000 40,074 10,000 35,000 52,074 29,601
Common stock | Class B Common Stock                  
Class of Stock [Line Items]                  
Shares of Class A common stock issued in connection with redemptions of LLC Interests (in shares) (10,000) 0 (25,000) (2,000) (40,074) (10,000) (35,000) (52,074) (29,601)
Shares of Class B common stock surrendered and canceled (in shares)             35,000 52,074 29,601