Reportable Segments - Segment Reporting Information (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Nov. 18, 2020	Aug. 25, 2021	Aug. 26, 2020
Sales:
Total sales	$ 41,947	$ 41,900	$ 214,022
Segment level profit:
Segment level profit	5,086		14,205
Depreciation and amortization:
Depreciation and amortization	2,142		11,514
Capital expenditures:
Capital expenditures	433		2,120
Loss before income taxes and discontinued operations:
Segment level profit	5,086		14,205
Opening costs	0		(14)
Depreciation and amortization	(2,142)		(11,514)
Selling, general and administrative expenses	(4,267)		(24,571)
Other charges	(416)		(3,401)
Net provision (gain) for asset impairments and restaurant closings	85		(10,193)
Net gain on disposition of property and equipment	(117)		11,557
Interest income	8		60
Interest expense	(1,212)		(6,388)
Other income, net	30		1,195
Loss before income taxes and discontinued operations	(2,945)		(29,064)
Total assets:
Assets			177,403
Intangible assets			29,642
Luby's cafeterias
Sales:
Total sales	31,949		149,691
Segment level profit:
Segment level profit	4,896		12,087
Loss before income taxes and discontinued operations:
Segment level profit	4,896		12,087
Fuddruckers restaurants
Sales:
Total sales	4,550		32,428
Segment level profit:
Segment level profit	(412)		(2,196)
Loss before income taxes and discontinued operations:
Segment level profit	(412)		(2,196)
Fuddruckers restaurants | Trade Names
Total assets:
Intangible assets			6,900
Cheeseburger in Paradise restaurants
Sales:
Total sales	0		1,522
Segment level profit:
Segment level profit	(85)		(308)
Loss before income taxes and discontinued operations:
Segment level profit	(85)		(308)
Cheeseburger in Paradise restaurants | Fuddruckers trade name, Cheeseburger in Paradise liquor licenses, and Jimmy Buffet intangibles
Total assets:
Intangible assets			34
Culinary contract services
Sales:
Total sales	4,918		26,747
Segment level profit:
Segment level profit	451		2,529
Loss before income taxes and discontinued operations:
Segment level profit	451		2,529
Fuddruckers franchise operations
Sales:
Total sales	530		3,634
Segment level profit:
Segment level profit	236		2,093
Loss before income taxes and discontinued operations:
Segment level profit	236		2,093
Fuddruckers franchise operations | Royalty intangibles
Total assets:
Intangible assets			8,400
Operating Segments | Luby's cafeterias
Depreciation and amortization:
Depreciation and amortization	1,530		7,598
Capital expenditures:
Capital expenditures	416		1,841
Loss before income taxes and discontinued operations:
Depreciation and amortization	(1,530)		(7,598)
Total assets:
Assets			90,349
Operating Segments | Fuddruckers restaurants
Depreciation and amortization:
Depreciation and amortization	167		1,507
Capital expenditures:
Capital expenditures	17		148
Loss before income taxes and discontinued operations:
Depreciation and amortization	(167)		(1,507)
Total assets:
Assets			26,502
Operating Segments | Cheeseburger in Paradise restaurants
Depreciation and amortization:
Depreciation and amortization	0		77
Capital expenditures:
Capital expenditures	0		34
Loss before income taxes and discontinued operations:
Depreciation and amortization	0		(77)
Total assets:
Assets			164
Operating Segments | Culinary contract services
Depreciation and amortization:
Depreciation and amortization	8		34
Loss before income taxes and discontinued operations:
Depreciation and amortization	(8)		(34)
Total assets:
Assets			4,744
Operating Segments | Fuddruckers franchise operations
Depreciation and amortization:
Depreciation and amortization	1		298
Capital expenditures:
Capital expenditures	0		9
Loss before income taxes and discontinued operations:
Depreciation and amortization	(1)		(298)
Total assets:
Assets			8,973
Corporate
Depreciation and amortization:
Depreciation and amortization	436		2,000
Capital expenditures:
Capital expenditures	0		88
Loss before income taxes and discontinued operations:
Depreciation and amortization	$ (436)		(2,000)
Total assets:
Assets			$ 46,671