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Basis of Presentation Narrative (Details)
$ in Thousands
Jan. 27, 2021
USD ($)
Nov. 19, 2020
segment
Nov. 18, 2020
segment
restaurant
Dec. 16, 2020
restaurant
Aug. 26, 2020
restaurant
Mar. 12, 2020
restaurant
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Number of reportable segments | segment   1        
Interim President and Chief Executive Officer | Subsequent Event            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Professional fees | $ $ 50          
Monthly professional fees | $ $ 20          
Luby’s cafeterias, Fuddruckers restaurants, Cheeseburger in Paradise restaurant, Fuddruckers franchise operations, and Culinary Contract Services            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Number of reportable segments | segment     5      
Company-owned restaurants            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Number of restaurants         61 118
Company-owned restaurants | COVID 19            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Number of restaurants       83    
Luby's cafeterias            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Number of restaurants     60      
Luby's cafeterias | COVID 19            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Number of restaurants       59    
Fuddruckers restaurants            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Number of restaurants     24   24  
Fuddruckers restaurants | COVID 19            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Number of restaurants       24    
Fuddruckers franchise operations            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Number of restaurants     71   71 90
Fuddruckers franchise operations | COVID 19            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Number of restaurants       71