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Basis of Presentation Narrative (Details)
$ in Thousands
4 Months Ended
Mar. 10, 2021
USD ($)
restaurant
Nov. 19, 2020
segment
Nov. 18, 2020
segment
restaurant
Mar. 10, 2021
USD ($)
restaurant
Apr. 23, 2021
restaurant
Apr. 05, 2021
property
Apr. 01, 2021
restaurant
Mar. 16, 2021
restaurant
Mar. 11, 2021
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                  
Changes in estimated cash flows during liquidation | $       $ (594)              
Disposal Group, Disposed of by Sale, Not Discontinued Operation                      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                      
Changes in estimated cash flows during liquidation | $ $ 800                    
Disposal Group, Disposed of by Sale, Not Discontinued Operation | Subsequent Event                      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                      
Number of restaurants, sold | property           1          
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 81     81              
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 58     58              
Fuddruckers restaurants                      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                      
Number of restaurants     24             24  
Fuddruckers restaurants | Franchise Agreement                      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                      
Number of restaurants, lease obligations assumed                 9    
Changes in estimated cash flows during liquidation | $ $ 3,400     $ 3,400              
Fuddruckers restaurants | Franchise Agreement | Subsequent Event | Third-Party                      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                      
Number of restaurants         2,000,000   1 8      
Number of restaurants, lease obligations assumed             9        
Fuddruckers restaurants | Management Agreement | Subsequent Event | Third-Party                      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                      
Number of restaurants             1,000,000        
Fuddruckers restaurants | COVID 19                      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                      
Number of restaurants 23     23              
Fuddruckers franchise operations                      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                      
Number of restaurants 90   71 90           71  
Fuddruckers franchise operations | COVID 19                      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                      
Number of restaurants 72     72              
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