Nature of Operations and Significant Accounting Policies - Narrative (Details) $ in Thousands	12 Months Ended
	Aug. 26, 2020 USD ($) segment business	Aug. 28, 2019 USD ($) restaurant property segment	Aug. 29, 2018 USD ($)	Aug. 26, 2020 restaurant	Aug. 26, 2020 franchise	Mar. 31, 2020 restaurant	Aug. 29, 2019 USD ($)
Nature of Operations and Significant Accounting Policies (Details) [Line Items]
Number of restaurants | property		7
Number of lines of businesses | business	4
Reclassification adjustment		$ 196
Number of reportable segments | segment	5
Marketing and advertising expense	$ 3,900	$ 4,000
Accounting standards update		us-gaap:AccountingStandardsUpdate201602Member	us-gaap:AccountingStandardsUpdate201409Member
Operating lease liabilities	21,700
Operating lease liabilities - current	3,903						$ 8,061
Total Current Assets		$ 27,395					27,240
Total Shareholders' Equity	73,599	101,030	$ 112,628				102,057
Cumulative Effect, Period of Adoption, Adjustment
Nature of Operations and Significant Accounting Policies (Details) [Line Items]
Total Shareholders' Equity		1,027	$ 2,479
Other operating expense
Nature of Operations and Significant Accounting Policies (Details) [Line Items]
Marketing and advertising expense	500	100
Selling, general and administrative expense
Nature of Operations and Significant Accounting Policies (Details) [Line Items]
Reclassification adjustment		506
Marketing and advertising expense	$ 3,400	$ 3,900
Company-owned restaurants
Nature of Operations and Significant Accounting Policies (Details) [Line Items]
Number of restaurants | restaurant				85
Company-owned restaurants | Texas
Nature of Operations and Significant Accounting Policies (Details) [Line Items]
Number of restaurants | restaurant				78
Fuddruckers franchise operations
Nature of Operations and Significant Accounting Policies (Details) [Line Items]
Number of restaurants		102		71	71	90
Luby’s cafeterias, Fuddruckers restaurants, Cheeseburger in Paradise restaurant, Fuddruckers franchise operations, and Culinary Contract Services
Nature of Operations and Significant Accounting Policies (Details) [Line Items]
Number of reportable segments | segment	5	5
Accounting Standards Update 2016-02 | Cumulative Effect, Period of Adoption, Adjustment
Nature of Operations and Significant Accounting Policies (Details) [Line Items]
Operating lease liabilities							32,400
Operating lease liabilities - current							8,061
Total Current Assets							(155)
Total Shareholders' Equity							1,027
Sale Leaseback Transaction, Deferred Gain, Gross | Accounting Standards Update 2016-02 | Cumulative Effect, Period of Adoption, Adjustment
Nature of Operations and Significant Accounting Policies (Details) [Line Items]
Total Shareholders' Equity							$ 2,000