Reportable Segments (Details)	12 Months Ended
	Aug. 26, 2020 restaurant segment	Aug. 26, 2020 franchise	Aug. 26, 2020 contract	Aug. 26, 2020 employee	Mar. 31, 2020 restaurant	Aug. 28, 2019 restaurant property contract
Segment Reporting Information [Line Items]
Number of reportable segments | segment	5
Number of restaurants | property						7
Luby's cafeterias
Segment Reporting Information [Line Items]
Number of restaurants	61					79
Luby's Cafeteria and Fuddruckers Restaurant
Segment Reporting Information [Line Items]
Number of restaurants	5
Fuddruckers restaurants
Segment Reporting Information [Line Items]
Number of restaurants	24					44
Cheeseburger in Paradise restaurants
Segment Reporting Information [Line Items]
Number of restaurants	0					1
Culinary contract services
Segment Reporting Information [Line Items]
Number of contracts | contract			26			31
Fuddruckers franchise operations
Segment Reporting Information [Line Items]
Number of restaurants	71	71			90	102
Franchise term	20 years
Fuddruckers franchise operations | Management
Segment Reporting Information [Line Items]
Number of franchise trained employees | employee				3