Quarterly report pursuant to Section 13 or 15(d)

Document And Entity Information

v3.10.0.1
Document And Entity Information - shares
9 Months Ended
Sep. 30, 2018
Oct. 26, 2018
Document Information [Line Items]    
Entity Registrant Name Ruths Hospitality Group, Inc.  
Entity Central Index Key 0001324272  
Trading Symbol ruth  
Current Fiscal Year End Date --12-30  
Entity Filer Category Accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Document Type 10-Q  
Document Period End Date Sep. 30, 2018  
Document Fiscal Year Focus 2018  
Document Fiscal Period Focus Q3  
Amendment Flag false  
Common Stock [Member]    
Document Information [Line Items]    
Entity Common Stock, Shares Outstanding (in shares)   30,809,350
Unvested Restricted Stock [Member]    
Document Information [Line Items]    
Entity Common Stock, Shares Outstanding (in shares)   1,078,571