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RELATED PARTY TRANSACTIONS (Details)	3 Months Ended		9 Months Ended
	Sep. 27, 2017 USD ($)	Sep. 28, 2016 USD ($)	Sep. 27, 2017 USD ($) renewal_option	Sep. 28, 2016 USD ($)	Dec. 28, 2016 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	$ 1,471,000	$ 0
Tax receivable agreement liability	283,961,000		283,961,000		$ 272,482,000
Distributions paid to non-controlling interest holders	13,000	0	2,392,000	1,602,000
Tax distributions payable to non-controlling interest holders	0		0		607,000
Affiliated Entity
Related Party Transaction [Line Items]
Amount paid to USHG for general corporate expenses	0	1,000	6,000	7,000
Due from related parties, current	0		0		0
Amounts due to related parties, current	0		0		1,000
Share Our Strength [Member]
Related Party Transaction [Line Items]
Expenses from transactions with related party	29,000	17,000	148,000	115,000
Charitable campaign flow through	0	0	631,000	587,000
Daily Provisions
Related Party Transaction [Line Items]
Amounts due to related parties, current and noncurrent	1,000		1,000
Revenue from related parties		0	$ 4,000	0
Amounts due to related parties, current					0
Subsidiary to Affiliated Entity [Member]
Related Party Transaction [Line Items]
Number of renewal terms | renewal_option			5
Renewal option period			5 years
Concession Income [Member] | Subsidiary to Affiliated Entity [Member]
Related Party Transaction [Line Items]
Due from related parties, current	75,000		$ 75,000		11,000
Revenue from Related Parties	193,000	174,000	328,000	277,000
Rent Expense [Member] | Madison Square Park Conservancy
Related Party Transaction [Line Items]
Expenses from transactions with related party	199,000	195,000	531,000	585,000
Amounts due to related parties, current	0		0		1,000
Tenant Improvement Allowance [Member] | Madison Square Park Conservancy
Related Party Transaction [Line Items]
Accounts Receivable, Related Parties, Current	0		0		200,000
Related Party Transaction, Other Revenues from Transactions with Related Party	0	0	200,000	0
Mobo Systems, Inc. [Member] | Board of Directors Chairman
Related Party Transaction [Line Items]
Expenses from transactions with related party	19,000	$ 0	57,000	$ 0
Amounts due to related parties, current	$ 0		$ 0		$ 0

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