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Note 11 - Impairment of Long-Lived Assets, Discontinued Operations and Property Held for Sale (Details) (USD $)
 12 Months Ended
Aug. 27, 2014
Aug. 28, 2013
Aug. 29, 2012
Aug. 30, 2011
Aug. 30, 2010
Aug. 31, 2010
Note 11 - Impairment of Long-Lived Assets, Discontinued Operations and Property Held for Sale (Details) [Line Items]            
Provision For Asset Impairment $ 2,498,000 $ 615,000 $ 451,000      
Gain (Loss) on Disposition of Property Plant Equipment 2,357,000 1,723,000 (278,000)      
Carrying Value Of Intangible Assets 5,300,000          
Disposal Group, Including Discontinued Operation, Other Expense       200,000   700,000
Severance Costs     0 0 0.7  
Disposal Group, Including Discontinued Operation, Property, Plant and Equipment, Current 1,000,000 400,000 600,000      
Newer Properties [Member] | Minimum [Member]
            
Note 11 - Impairment of Long-Lived Assets, Discontinued Operations and Property Held for Sale (Details) [Line Items]            
Time Span for Future Cash Flow 20 years          
Newer Properties [Member] | Maximum [Member]
            
Note 11 - Impairment of Long-Lived Assets, Discontinued Operations and Property Held for Sale (Details) [Line Items]            
Time Span for Future Cash Flow 25 years          
Older Properties [Member] | Minimum [Member]
            
Note 11 - Impairment of Long-Lived Assets, Discontinued Operations and Property Held for Sale (Details) [Line Items]            
Time Span for Future Cash Flow 5 years          
Older Properties [Member] | Maximum [Member]
            
Note 11 - Impairment of Long-Lived Assets, Discontinued Operations and Property Held for Sale (Details) [Line Items]            
Time Span for Future Cash Flow 10 years          
Impairment Charge Related to Locations Previously Closed [Member]
            
Note 11 - Impairment of Long-Lived Assets, Discontinued Operations and Property Held for Sale (Details) [Line Items]            
Lease Impairment $ 0          
Discontinued Properties [Member]
            
Note 11 - Impairment of Long-Lived Assets, Discontinued Operations and Property Held for Sale (Details) [Line Items]            
Number of Restaurants 9          
Underperforming [Member]
            
Note 11 - Impairment of Long-Lived Assets, Discontinued Operations and Property Held for Sale (Details) [Line Items]            
Number of Restaurants     2      
Closure of Leased Locations [Member]
            
Note 11 - Impairment of Long-Lived Assets, Discontinued Operations and Property Held for Sale (Details) [Line Items]            
Number of Restaurants 4   2      
Previuosly Closed [Member]
            
Note 11 - Impairment of Long-Lived Assets, Discontinued Operations and Property Held for Sale (Details) [Line Items]            
Disposal Group Including Discontinued Operation Assets Of Disposal Group Number 24          
Luby's Cafetria [Member]
            
Note 11 - Impairment of Long-Lived Assets, Discontinued Operations and Property Held for Sale (Details) [Line Items]            
Number of Restaurants 1          
Fuddruckers (Member)
            
Note 11 - Impairment of Long-Lived Assets, Discontinued Operations and Property Held for Sale (Details) [Line Items]            
Number of Restaurants 2 1        
Cheeseburger in Paradise [Member]
            
Note 11 - Impairment of Long-Lived Assets, Discontinued Operations and Property Held for Sale (Details) [Line Items]            
Number of Restaurants 2          
Closed Cheeseburger in Paradise [Member]
            
Note 11 - Impairment of Long-Lived Assets, Discontinued Operations and Property Held for Sale (Details) [Line Items]            
Number of Restaurants 9          
Held For Sale [Member]
            
Note 11 - Impairment of Long-Lived Assets, Discontinued Operations and Property Held for Sale (Details) [Line Items]            
Number of Restaurants   1        
Koo Koo Roo Chicken Bistro [Member]
            
Note 11 - Impairment of Long-Lived Assets, Discontinued Operations and Property Held for Sale (Details) [Line Items]            
Number of Restaurants   1