Document And Entity Information - shares	6 Months Ended
	Mar. 13, 2019	Apr. 17, 2019
Document And Entity Information
Entity Registrant Name	LUBYS INC
Entity Central Index Key	0000016099
Trading Symbol	lub
Current Fiscal Year End Date	--08-30
Entity Filer Category	Accelerated Filer
Document Type	10-Q
Document Period End Date	Mar. 13, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q2
Amendment Flag	false
Entity Common Stock, Shares Outstanding		29,875,791
Entity Emerging Growth Company	false
Entity Small Business	true