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DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 25, 2022
USD ($)
restaurant
state
Sep. 26, 2021
USD ($)
restaurant
Sep. 25, 2022
USD ($)
segment
restaurant
state
Sep. 26, 2021
USD ($)
restaurant
Dec. 26, 2021
USD ($)
Change in Accounting Estimate [Line Items]          
Number of restaurants | restaurant 176   176    
Number of states | state 16   16    
Number of restaurants opened | restaurant 10   26    
Operating segments | segment     1    
Reportable segments | segment     1    
Impairment of long-lived assets and closed-store costs $ 1,693 $ 4,415 $ 1,845 $ 4,415  
Business exit costs 9,800   9,800    
Restructuring charges $ 11,081 $ 0 $ 11,081 $ 0  
Workforce reductions percentage 5.00%   5.00%    
Future lease liability $ 2,700   $ 2,700    
Contingent consideration liability fair value 18,322   18,322   $ 20,477
Accounts receivable 4,579   4,579   2,644
Federal deposit insurance corporation (up to)     300    
Deferred costs $ 5,300   $ 5,300    
Amortization period of deferred costs     7 years    
Accounting Standards Update [Extensible Enumeration]     Accounting Standards Update 2016-02 [Member]    
One store intended to close          
Change in Accounting Estimate [Line Items]          
Number of restaurants | restaurant 1   1    
Impairment of long-lived assets and closed-store costs $ 1,700   $ 1,700    
Certain company restaurants and two Spyce stores          
Change in Accounting Estimate [Line Items]          
Number of restaurants | restaurant   2   2  
Impairment of long-lived assets and closed-store costs   $ 4,400   $ 4,400  
One Spyce store closed          
Change in Accounting Estimate [Line Items]          
Number of restaurants | restaurant 1   1    
Business exit costs     $ 200    
Facility Closing          
Change in Accounting Estimate [Line Items]          
Business exit costs $ 6,800   6,800    
Future Lease Liability, Net Sublease          
Change in Accounting Estimate [Line Items]          
Business exit costs 3,000   3,000    
Employee Severance          
Change in Accounting Estimate [Line Items]          
Business exit costs 600   600    
Abandonment of Potential Future Restaurant Sites          
Change in Accounting Estimate [Line Items]          
Business exit costs 600   600    
Other Restructuring          
Change in Accounting Estimate [Line Items]          
Business exit costs 100   100    
Accumulated Deficit | Cumulative-effect adjustment | Pro Forma          
Change in Accounting Estimate [Line Items]          
Cumulative-effect adjustment 4,200   4,200    
Minimum | Cumulative-effect adjustment | Pro Forma          
Change in Accounting Estimate [Line Items]          
Operating lease liabilities 263,000   263,000    
Right-of-use assets 222,000   222,000    
Prepaid rent 1,500   1,500    
Minimum | Accumulated Deficit | Cumulative-effect adjustment | Pro Forma          
Change in Accounting Estimate [Line Items]          
Cumulative-effect adjustment 400   400    
Maximum | Cumulative-effect adjustment | Pro Forma          
Change in Accounting Estimate [Line Items]          
Operating lease liabilities 291,000   291,000    
Right-of-use assets 246,000   246,000    
Prepaid rent 2,000   2,000    
Maximum | Accumulated Deficit | Cumulative-effect adjustment | Pro Forma          
Change in Accounting Estimate [Line Items]          
Cumulative-effect adjustment $ 500   $ 500    
New York City metropolitan area | Geographic | Revenue          
Change in Accounting Estimate [Line Items]          
Concentration risk percentage 32.00% 33.00% 32.00% 33.00%  
Credit card processors          
Change in Accounting Estimate [Line Items]          
Accounts receivable $ 2,100   $ 2,100   $ 1,100
Spyce          
Change in Accounting Estimate [Line Items]          
Research and development cost 400   1,400    
Contingent consideration liability 16,400   16,400    
Contingent consideration liability fair value $ 18,300   $ 18,300