RELATED PARTY TRANSACTIONS (Details)	3 Months Ended
Mar. 28, 2018 USD ($) renewal_option	Mar. 29, 2017 USD ($)	Dec. 27, 2017 USD ($)
Related Party Transaction [Line Items]
Percentage of tax benefits due to equity owners	85.00%
Tax receivable agreement payments to related parties	$ 0	$ 1,471,000
Tax receivable agreement liability	172,053,000		$ 159,373,000
Distributions paid to non-controlling interest holders	83,000	355,000
Tax distributions payable to non-controlling interest holders	0		0
Affiliated Entity
Related Party Transaction [Line Items]
Amount paid to USHG for general corporate expenses	2,000	5,000
Amounts due to related parties, current	1,000		0
Due from related parties, current	0		0
Daily Provisions
Related Party Transaction [Line Items]
Amounts due to related parties, current and noncurrent	0		0
Amounts of transaction	$ 0	0
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]
Charitable campaign flow through	$ 0	0
Concession Income \| Subsidiary to Affiliated Entity
Related Party Transaction [Line Items]
Due from related parties, current	24,000		18,000
Revenue from related parties	47,000	20,000
Rent Expense \| Madison Square Park Conservancy
Related Party Transaction [Line Items]
Amounts due to related parties, current	0		0
Revenues from transactions with related party	0	200,000
Expenses from transactions with related party	267,000	199,000
Tenant Improvement Allowance \| Madison Square Park Conservancy
Related Party Transaction [Line Items]
Amount due from MSP conservancy	0		0
Mobo Systems, Inc. \| Board of Directors Chairman
Related Party Transaction [Line Items]
Amounts due to related parties, current	0		0
Expenses from transactions with related party	25,000	18,000
Square, Inc \| Board of Directors Chairman
Related Party Transaction [Line Items]
Amounts due to related parties, current	0		$ 0
Expenses from transactions with related party	$ 43,000	$ 0

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