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REVENUE Schedule of Revenue Recognized (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 26, 2018
Sep. 26, 2018
Jun. 27, 2018
Mar. 28, 2018
Dec. 27, 2017
Sep. 27, 2017
Jun. 28, 2017
Mar. 29, 2017
Dec. 26, 2018
Dec. 27, 2017
Dec. 28, 2016
Disaggregation of Revenue [Line Items]                      
TOTAL REVENUE $ 124,265 $ 119,647 $ 116,282 $ 99,116 $ 96,136 $ 94,609 $ 91,316 $ 76,749 $ 459,310 $ 358,810 $ 268,475
Shack sales                      
Disaggregation of Revenue [Line Items]                      
TOTAL REVENUE                 445,589 346,388 259,350
Licensing revenue                      
Disaggregation of Revenue [Line Items]                      
TOTAL REVENUE                 13,721 $ 12,422 $ 9,125
If reported under ASC 605                      
Disaggregation of Revenue [Line Items]                      
TOTAL REVENUE                 459,978    
If reported under ASC 605 | Shack sales                      
Disaggregation of Revenue [Line Items]                      
TOTAL REVENUE                 445,589    
If reported under ASC 605 | Licensing revenue                      
Disaggregation of Revenue [Line Items]                      
TOTAL REVENUE                 14,389    
ASC 2014-09 | Increase (decrease)                      
Disaggregation of Revenue [Line Items]                      
TOTAL REVENUE                 (668)    
ASC 2014-09 | Increase (decrease) | Shack sales                      
Disaggregation of Revenue [Line Items]                      
TOTAL REVENUE                 0    
ASC 2014-09 | Increase (decrease) | Licensing revenue                      
Disaggregation of Revenue [Line Items]                      
TOTAL REVENUE                 $ (668)