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Summary of Significant Accounting Policies (Details)
3 Months Ended 12 Months Ended
Dec. 31, 2019
USD ($)
restaurant
$ / shares
Dec. 29, 2020
USD ($)
restaurant
$ / shares
Sep. 29, 2020
USD ($)
$ / shares
Jun. 30, 2020
USD ($)
$ / shares
Mar. 31, 2020
USD ($)
$ / shares
Dec. 31, 2019
USD ($)
restaurant
$ / shares
Sep. 24, 2019
USD ($)
$ / shares
Jun. 25, 2019
USD ($)
$ / shares
Mar. 26, 2019
USD ($)
$ / shares
Dec. 29, 2020
USD ($)
restaurant
$ / shares
Dec. 31, 2019
USD ($)
restaurant
$ / shares
Dec. 25, 2018
USD ($)
$ / shares
Fiscal Year                        
Length of fiscal year                   364 days 371 days 364 days
Revenue   $ 637,989,000 $ 631,185,000 $ 476,425,000 $ 652,524,000 $ 725,238,000 $ 650,489,000 $ 689,828,000 $ 690,608,000 $ 2,398,123,000 $ 2,756,163,000 $ 2,457,449,000
Earnings Per Share, Diluted | $ / shares   $ 0.28 $ 0.42 $ (0.48) $ 0.23 $ 0.61 $ 0.52 $ 0.63 $ 0.70 $ 0.45 $ 2.46 $ 2.20
Cash and Cash Equivalents                        
Cash and cash equivalents included receivables from credit card entity $ 22,400,000 $ 18,100,000       $ 22,400,000       $ 18,100,000 $ 22,400,000  
Settlement period of credit card receivables, minimum                   2 days    
Settlement period of credit card receivables, maximum                   3 days    
Income Taxes                        
Deferred Income Tax, Valuation Allowance $ 0         $ 0         $ 0 $ 0
Receivables                        
Minimum number of days receivable are past due, warranting individual evaluation for collectability                   120 days    
Franchise                        
Principles of Consolidation                        
Number of restaurants | restaurant 97 97       97       97 97  
Minimum                        
Fiscal Year                        
Length of fiscal year                   364 days    
Length of fiscal quarter                   91 days    
Maximum                        
Fiscal Year                        
Length of fiscal year                   371 days    
Length of fiscal quarter                   98 days    
Unconsolidated | Franchise                        
Principles of Consolidation                        
Number of restaurants | restaurant 24 24       24       24 24  
Unconsolidated | Non-Texas Roadhouse restaurants                        
Principles of Consolidation                        
Ownership percentage by entity 40.00% 40.00%       40.00%       40.00% 40.00%  
Number of restaurants | restaurant 4 4       4       4 4  
Unconsolidated | Minimum | Franchise                        
Principles of Consolidation                        
Ownership percentage by entity 5.00% 5.00%       5.00%       5.00% 5.00%  
Unconsolidated | Maximum | Franchise                        
Principles of Consolidation                        
Ownership percentage by entity 10.00% 10.00%       10.00%       10.00% 10.00%  
Restaurant and other sales                        
Fiscal Year                        
Revenue $ 59,000,000.0                 $ 2,380,177,000 $ 2,734,177,000 $ 2,437,115,000
Restaurant and other sales | Minimum                        
Fiscal Year                        
Earnings Per Share, Diluted | $ / shares $ 0.10         $ 0.10            
Restaurant and other sales | Maximum                        
Fiscal Year                        
Earnings Per Share, Diluted | $ / shares $ 0.11         $ 0.11