v3.21.2

BASIS OF PRESENTATION (Details) $ in Thousands					1 Months Ended		3 Months Ended		6 Months Ended
	Jul. 30, 2021 restaurant	Jul. 30, 2021 item	May 14, 2020 USD ($)	Jul. 18, 2018	Mar. 29, 2020 restaurant	Dec. 29, 2019	Jul. 04, 2021 USD ($) restaurant country	Jun. 28, 2020	Jul. 04, 2021 USD ($) restaurant country	Jun. 28, 2020	Jan. 03, 2021 USD ($)
Business information
Number of restaurants							127		127
Number of countries in which entity operates | country							3		3
Deferred tax asset, net | $							$ 4,600		$ 4,600		$ 4,900
Effective tax rate							2.40%	23.40%	2.70%	(46.20%)
Cash and Cash Equivalents, at Carrying Value [Abstract]
Certificate of deposit | $			$ 3,500
CD interest rate			3.00%
Frequency of compounding interest on a CD			30 days
Restricted cash and marketing fund
Restricted cash | $							$ 824		$ 824		1,502
Assets held for sale
Assets held for sale | $							1,024		1,024		1,070
Contract sale price for assets held for sale | $							$ 2,500		$ 2,500
Mercury
Business information
Ownership percentage in VIE				20.00%		20.00%
Entity Operated Units
Business information
Number of restaurants							27		27
Franchised Units
Business information
Number of restaurants							100		100
Marketing Development Fund
Restricted cash and marketing fund
Restricted cash | $							$ 824		$ 824		$ 1,500
Real Urban Barbecue Restaurant
Business information
Number of restaurants acquired					1
Granite City Food & Brewery Restaurants
Business information
Number of restaurants acquired					18
Village Inn Restaurants | Entity Operated Units | Subsequent Event
Business information
Number of restaurants acquired	21
Village Inn Restaurants | Franchised Units | Subsequent Event
Business information
Number of restaurants acquired	114	114
Bakers Square Restaurants | Entity Operated Units | Subsequent Event
Business information
Number of restaurants acquired	13

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