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EQUITY-BASED COMPENSATION - Schedule of compensation expense recognized (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 30, 2020	Dec. 25, 2019	Dec. 26, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity-based compensation expense	$ 5,560	$ 7,505	$ 6,143
Total income tax benefit recognized related to equity-based compensation	204	188	172
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity-based compensation expense	322	2,626	3,039
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity-based compensation expense	1,309	3,035	2,449
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity-based compensation expense	3,929	1,844	655
General and administrative expenses
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity-based compensation expense	5,039	7,189	5,991
Labor and related expenses
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity-based compensation expense	$ 521	$ 316	$ 152
Two Thousand and Fifteen Incentive Award Plan | Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value	$ 55.67	$ 51.97
Two Thousand and Fifteen Incentive Award Plan | Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value	$ 54.33	$ 49.87

X

- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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-Publisher FASB
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-Topic 718
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Amount of tax benefit for recognition of expense of award under share-based payment arrangement.

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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