Document And Entity Information (USD $)	12 Months Ended
	Aug. 28, 2013	Nov. 04, 2013	Feb. 13, 2013
Document and Entity Information [Abstract]
Entity Registrant Name	LUBYS INC
Document Type	10-K
Current Fiscal Year End Date	--08-28
Entity Common Stock, Shares Outstanding		28,314,984
Entity Public Float			$ 152,309,024
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	Aug. 28, 2013
Document Fiscal Year Focus	2013
Document Fiscal Period Focus	FY