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EARNINGS PER SHARE - Schedule of Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 30, 2020
Sep. 23, 2020
Jun. 24, 2020
Mar. 25, 2020
Dec. 25, 2019
Sep. 25, 2019
Jun. 26, 2019
Mar. 27, 2019
Dec. 30, 2020
Dec. 25, 2019
Dec. 26, 2018
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]                      
Net income $ (20,314) $ (6,110) $ (18,031) $ (1,079) $ (2,073) $ 11,423 $ 11,171 $ 3,607 $ (45,534) $ 24,128 $ 21,948
Less: net income (loss) attributable to non-controlling interests                 (3,376) 4,301 6,769
Net income (loss) attributable to Shake Shack Inc. $ (19,428) $ (5,559) $ (16,211) $ (960) $ (2,093) $ 10,344 $ 9,030 $ 2,546 $ (42,158) $ 19,827 $ 15,179
Denominator:                      
Weighted-average shares of Class A common stock outstanding—basic (shares)                 37,129 31,381 28,299
Effect of dilutive securities:                      
Weighted-average shares of Class A common stock outstanding—diluted (shares)                 37,129 32,251 29,179
Earnings per share of Class A common stock—basic (in dollars per share)                 $ (1.14) $ 0.63 $ 0.54
Earnings per share of Class A common stock—diluted (in dollars per share)                 $ (1.14) $ 0.61 $ 0.52
Stock options                      
Effect of dilutive securities:                      
Restricted Class B units (shares)                 0 743 798
Performance Shares                      
Effect of dilutive securities:                      
Restricted Class B units (shares)                 0 70 63
Restricted Stock                      
Effect of dilutive securities:                      
Restricted Class B units (shares)                 0 57 19