Annual report pursuant to Section 13 and 15(d)

Document And Entity Information

Document And Entity Information - USD ($)
12 Months Ended
Dec. 26, 2021
Feb. 03, 2022
Jun. 27, 2021
Document Information [Line Items]      
Entity Registrant Name Ruth’s Hospitality Group, Inc.    
Entity Central Index Key 0001324272    
Trading Symbol RUTH    
Current Fiscal Year End Date --12-26    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
Entity Shell Company false    
Entity Current Reporting Status Yes    
Entity Voluntary Filers No    
Entity Well-known Seasoned Issuer Yes    
Entity Public Float     $ 813,506,300
Document Type 10-K    
Document Period End Date Dec. 26, 2021    
Document Fiscal Year Focus 2021    
Document Fiscal Period Focus FY    
Amendment Flag false    
Title of 12(b) Security Common stock, par value $0.01 per share    
Security Exchange Name NASDAQ    
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 Suite 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    
Entity Interactive Data Current Yes    
Document Annual Report true    
Document Transition Report false    
Documents Incorporated by Reference [Text Block] The information required by Part III of Annual Report on Form 10-K, to the extent not set forth herein, is incorporated herein by reference to the registrant’s Proxy Statement for the 2022 Annual Meeting of Stockholders, to be filed with the Securities and Exchange Commission pursuant to Regulation 14A not later than 120 days after the close of the registrant’s fiscal year.    
ICFR Auditor Attestation Flag true    
Auditor Name KPMG LLC    
Auditor Location Orlando, FL    
Auditor Firm ID 185    
Common Stock [Member]      
Document Information [Line Items]      
Entity Common Stock, Shares Outstanding (in shares)   33,575,337  
Unvested Restricted Stock [Member]      
Document Information [Line Items]      
Entity Common Stock, Shares Outstanding (in shares)   738,269