v3.21.2

BASIS OF PRESENTATION (Details) $ in Thousands					1 Months Ended		3 Months Ended		9 Months Ended
	Oct. 08, 2021 restaurant item	Jul. 30, 2021 restaurant	May 14, 2020 USD ($)	Jul. 18, 2018	Mar. 29, 2020 restaurant	Dec. 29, 2019	Oct. 03, 2021 USD ($) restaurant country item	Sep. 27, 2020	Oct. 03, 2021 USD ($) restaurant country item	Sep. 27, 2020	Jan. 03, 2021 USD ($)
Business information
Number of restaurants							135		135
Number of countries in which entity operates | country							3		3
Deferred tax asset, net | $							$ 3,400		$ 3,400		$ 4,900
Effective tax rate							0.70%	127.00%	2.30%	(54.20%)
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 | $							$ 1,146		$ 1,146		1,502
Assets held for sale
Assets held for sale | $							$ 1,024		$ 1,024		1,070
Mercury
Business information
Ownership percentage in VIE				20.00%		20.00%
Entity Operated Units
Business information
Number of restaurants							31		31
Franchised Units
Business information
Number of restaurants							104		104
Marketing Development Fund
Restricted cash and marketing fund
Restricted cash | $							$ 1,100		$ 1,100		$ 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
Number of restaurants operating Famous Dave's ghost kitchens | item							8		8
Village Inn Restaurants | Entity Operated Units
Business information
Number of restaurants acquired		21
Village Inn Restaurants | Franchised Units
Business information
Number of restaurants acquired		109
Bakers Square Restaurants | Entity Operated Units
Business information
Number of restaurants acquired		11
Tahoe Joe's Business | Subsequent Event
Business information
Number of restaurants acquired	5
Buffet IP | Subsequent Event
Business information
Number of buffet concepts acquired | item	4

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