Impairment of Long-Lived Assets, Discontinued Operations and Property Held for Sale (Details Textual)	3 Months Ended			5 Months Ended	6 Months Ended	12 Months Ended
	Mar. 09, 2016 USD ($) properties location restaurant	Feb. 11, 2015 USD ($)	Nov. 18, 2009 location	Feb. 11, 2015 USD ($) location	Mar. 09, 2016 USD ($) properties location restaurant	Aug. 26, 2015 USD ($) properties restaurant	Aug. 27, 2014 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Asset Impairment Charges | $	$ 37,000	$ 218,000		$ 218,000	$ 37,000
Gain (Loss) on Disposition of Property Plant Equipment | $	556,000	$ 1,377,000		$ 1,087,000	$ 835,000
Disposal Group Including Discontinued Operation Assets of Disposal Group Number | properties					3	4
Property and equipment, net | $	198,697,000				$ 198,697,000	$ 200,202,000
Disposal Group, Including Discontinued Operation, Property, Plant and Equipment, Current | $	$ 3,100,000				$ 3,100,000	$ 4,500,000
Company Owned Restaurants [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of Restaurants | restaurant	178				178	177
Property and equipment, net | $							$ 1,500,000
Discontinued Operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of Restaurants | properties	4				4
Impairment of Leasehold | $					$ 0
Discontinued Operations [Member] | Luby's Cafeteria [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group Including Discontinued Operation Assets of Disposal Group Number | location			24
Discontinued Operations [Member] | Company Owned Restaurants [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Property and equipment, net | $	$ 1,900,000				$ 1,900,000
Cheeseburger in Paradise [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of Underperforming Restaurants | location				1	1
Goodwill, Impairment Loss | $	$ 38,000			$ 38,000		$ 38,000	$ 500,000
Number of Restaurants Closed for Disposal | location					2
Number of Restaurants | location	8				8
Fuddruckers [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number Of Restaurants Subject To Impairment | location				3
Number of Restaurants Reclassified to Continuing Operations | location	1				1
Minimum [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Expected Disposal Period					1 year
Minimum [Member] | Cheeseburger in Paradise [Member] | Discontinued Operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of Restaurants Closed for Disposal | location					3
Maximum [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Expected Disposal Period					3 years
Newer Properties [Member] | Minimum [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Time Span For Future Cash Flow					20 years
Newer Properties [Member] | Maximum [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Time Span For Future Cash Flow					25 years
Older Properties [Member] | Minimum [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Time Span For Future Cash Flow					5 years
Older Properties [Member] | Maximum [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Time Span For Future Cash Flow					10 years
Discontinued Operations, Held-for-sale [Member] | Discontinued Operations [Member] | Luby's Cafeteria [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of Restaurants | location	1				1