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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)

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
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