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RELATED PARTY TRANSACTIONS (Details)	3 Months Ended		9 Months Ended
	Sep. 23, 2020 USD ($)	Sep. 25, 2019 USD ($)	Sep. 23, 2020 USD ($) renewal_option	Sep. 25, 2019 USD ($)	Dec. 25, 2019 USD ($)
Related Party Transaction [Line Items]
Percentage of tax benefits due to equity owners	85.00%		85.00%
Tax receivable agreement payments to related parties	$ 0	$ 0	$ 6,643,000	$ 707,000
Tax receivable agreement liability	228,197,000		228,197,000		$ 234,426,000
Tax distributions payable to non-controlling interest holders	0		0		0
Distributions paid to non-controlling interest holders	164,000	39,000	$ 478,000	1,706,000
Subsidiary to Affiliated Entity
Related Party Transaction [Line Items]
Number of renewal terms | renewal_option			5
Renewal option period			5 years
Share Our Strength
Related Party Transaction [Line Items]
Expenses from transactions with related party	0	30,000	$ 0	30,000
Amount raised through donations	0	190,000	0	190,000
Mobo Systems, Inc. [Member] | Board of Directors Chairman
Related Party Transaction [Line Items]
Expenses from transactions with related party	75,000	44,000	169,000	122,000
Amounts due to related parties, current	0		0		0
Concession Income | Subsidiary to Affiliated Entity
Related Party Transaction [Line Items]
Revenue from related parties	26,000	250,000	60,000	401,000
Due from related parties, current	9,000		9,000		47,000
Rent Expense | Madison Square Park Conservancy
Related Party Transaction [Line Items]
Expenses from transactions with related party	173,000	138,000	392,000	692,000
Amounts due to related parties, current	249,000		249,000		53,000
Mobo Systems, Inc. | Board of Directors Chairman
Related Party Transaction [Line Items]
Expenses from transactions with related party	419,000	$ 487,000	1,208,000	$ 1,195,000
Amounts due to related parties, current	$ 0		$ 0		$ 0

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