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Contingencies and Legal Matters (Details) - USD ($)
$ in Millions
1 Months Ended 9 Months Ended
Jan. 09, 2020
Jun. 11, 2019
Jan. 31, 2019
Nov. 30, 2019
Oct. 31, 2019
Feb. 28, 2019
Jul. 05, 2020
Sep. 29, 2019
Loss Contingencies [Line Items]                
Accrual of loss contingency             $ 14.9 $ 10.0
Gessele v. Jack in the Box Inc.                
Loss Contingencies [Line Items]                
Alleged total potential damages     $ 62.0     $ 42.0    
Claimed damages disallowed by the court       $ 25.0        
Ramirez v. Jack in the Box Inc.                
Loss Contingencies [Line Items]                
Net charge for estimated litigation liability             7.3  
Litigation insurance recovery receivable             $ 7.3  
Ramirez v. Jack in the Box Inc. | Judicial Ruling                
Loss Contingencies [Line Items]                
Jury verdict for compensatory damages   $ 5.4            
Jury verdict for punitive damages   10.0            
Plaintiff motion for attorney's fees, amount         $ 5.1      
Attorney fees awarded $ 4.1              
Ramirez v. Jack in the Box Inc. | Judicial Ruling | Maximum                
Loss Contingencies [Line Items]                
Damages awarded   15.4            
Ramirez v. Jack in the Box Inc. | Judicial Ruling | Minimum                
Loss Contingencies [Line Items]                
Damages awarded   $ 3.2