| COVER PAGE | Jan. 31, 2022 |
| Entity Information [Line Items] | |
| Document Type | 8-K |
| Document Period End Date | Jan. 31, 2022 |
| Entity Registrant Name | LUBY’S, INC. |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 1-8308 |
| Entity Tax Identification Number | 74-1335253 |
| Entity Address, Address Line One | 13111 Northwest Freeway |
| Entity Address, Address Line Two | Suite 600 |
| Entity Address, City or Town | Houston |
| Entity Address, State or Province | TX |
| Entity Address, Postal Zip Code | 77040 |
| City Area Code | 713 |
| Local Phone Number | 329-6800 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| Amendment Flag | false |
| Entity Central Index Key | 0000016099 |
| Common Stock | |
| Entity Information [Line Items] | |
| Title of 12(b) Security | Common Stock ($0.32 par value per share) |
| Trading Symbol | LUB |
| Security Exchange Name | NYSE |
| Common Stock Purchase Rights | |
| Entity Information [Line Items] | |
| Title of 12(b) Security | Common Stock Purchase Rights |
| Trading Symbol | N/A |
| Security Exchange Name | NYSE |
