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Document And Entity Information - shares
6 Months Ended
Mar. 09, 2016
Apr. 13, 2016
Document And Entity Information    
Entity Registrant Name LUBYS INC  
Entity Central Index Key 0000016099  
Trading Symbol lub  
Current Fiscal Year End Date --08-31  
Entity Filer Category Accelerated Filer  
Entity Current Reporting Status Yes  
Entity Voluntary Filers No  
Entity Well-known Seasoned Issuer No  
Entity Common Stock, Shares Outstanding (in shares)   28,920,690
Document Type 10-Q  
Document Period End Date Mar. 09, 2016  
Document Fiscal Year Focus 2016  
Document Fiscal Period Focus Q2  
Amendment Flag false