Document And Entity Information	9 Months Ended
	May 06, 2015	Jun. 10, 2015
Document and Entity Information [Abstract]
Entity Registrant Name	LUBYS INC
Document Type	10-Q
Current Fiscal Year End Date	--08-26
Entity Common Stock, Shares Outstanding		28,597,902
Amendment Flag	false
Entity Central Index Key	0000016099
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Accelerated Filer
Entity Well-known Seasoned Issuer	No
Document Period End Date	May 06, 2015
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	Q3