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REVENUE Disaggregation of Revenue (Details) - USD ($) $ 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
Disaggregation of Revenue [Line Items]
TOTAL REVENUE	$ 157,510	$ 130,401	$ 91,786	$ 143,170	$ 151,435	$ 157,762	$ 152,713	$ 132,609	$ 522,867	$ 594,519	$ 459,310
Shack sales
Disaggregation of Revenue [Line Items]
TOTAL REVENUE									506,339	574,625	445,589
Sales-based royalties
Disaggregation of Revenue [Line Items]
TOTAL REVENUE									15,773	19,318	13,422
Initial territory and opening fees
Disaggregation of Revenue [Line Items]
TOTAL REVENUE									$ 755	$ 576	$ 299

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

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