Document And Entity Information
| Document And Entity Information | May 07, 2020 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | May 7, 2020 |
| Entity Registrant Name | RUTH’S HOSPITALITY GROUP, INC. |
| Entity Central Index Key | 0001324272 |
| Entity Emerging Growth Company | false |
| Entity File Number | 000-51485 |
| Entity Incorporation, State or Country Code | DE |
| Entity Tax Identification Number | 72-1060618 |
| Entity Address, Address Line One | 1030 W. Canton Avenue |
| Entity Address, Address Line Two | Ste. 100 |
| Entity Address, City or Town | Winter Park |
| Entity Address, State or Province | FL |
| Entity Address, Postal Zip Code | 32789 |
| City Area Code | 407 |
| Local Phone Number | 333-7440 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of each class | Common Stock, par value $0.01 per share |
| Trading Symbol(s) | RUTH |
| Name of each exchange on which registered | NASDAQ |