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Document and Entity Information - shares
 9 Months Ended
Sep. 24, 2019
Oct. 23, 2019
Document and Entity Information [Abstract]    
Entity Registrant Name Texas Roadhouse, Inc.  
Entity Central Index Key 0001289460  
Document Type 10-Q  
Document Period End Date Sep. 24, 2019  
Amendment Flag false  
Current Fiscal Year End Date --12-31  
Entity Current Reporting Status Yes  
Entity Filer Category Large Accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Trading Symbol TXRH  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   69,409,291
Document Fiscal Year Focus 2019  
Document Fiscal Period Focus Q3  
Document Quarterly Report true  
Document Transition Report false  
Entity File Number 000-50972  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 20-1083890  
Entity Address, Address Line One 6040 Dutchmans Lane, Suite 200  
Entity Address, City or Town Louisville  
Entity Address, State or Province KY  
Entity Address, Postal Zip Code 40205  
City Area Code 502  
Local Phone Number 426-9984  
Title of 12(b) Security Common Stock  
Security Exchange Name NASDAQ  
Entity Interactive Data Current Yes