MERGERS AND ACQUISITIONS - ALLOCATION OF TANGIBLE AND INTANGIBLE ASSETS ACQUIRED (Details) - USD ($) $ in Thousands	Sep. 26, 2021	Jul. 22, 2021	Dec. 27, 2020	Dec. 10, 2020	Sep. 21, 2020
Business Acquisition [Line Items]
Goodwill	$ 185,861		$ 10,909
GFG Holdings Inc
Business Acquisition [Line Items]
Cash		$ 8,693
Accounts receivable		7,246
Prepaid and other current assets		3,818
Other intangible assets, net		277,700
Goodwill		176,155
Right of use assets		6,514
Fixed assets		8,380
Other assets, noncurrent		1,229
Accounts payable		(2,408)
Accrued expense		(10,168)
Accrued Advertising		(3,207)
Deferred income		(869)
Operating lease liability		(8,744)
Deferred tax liability		(18,867)
Other liabilities		(985)
Total net identifiable liabilities (net deficit)		$ 444,487
Fog Cutter Capital Group Inc
Business Acquisition [Line Items]
Prepaid and other current assets				$ 33
Deferred tax assets				20,402
Other assets, current				100
Accounts payable				(926)
Accrued expense				(6,973)
Current portion of debt				(12,486)
Litigation reserve				(3,980)
Due to affiliates				(43,653)
Total net identifiable liabilities (net deficit)				$ (47,483)
Johnny Rockets
Business Acquisition [Line Items]
Cash					$ 812
Accounts receivable					1,452
Assets held for sale					10,765
Other intangible assets, net					26,900
Goodwill					258
Deferred tax assets					4,039
Other assets, current					438
Accounts payable					(1,113)
Accrued expense					(3,740)
Deferred franchise fees					(4,988)
Operating lease liability					(10,028)
Other liabilities					(65)
Total net identifiable liabilities (net deficit)					$ 24,730