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BASIS OF PRESENTATION - Narrative (Details)
$ in Millions
3 Months Ended 6 Months Ended
Apr. 14, 2024
USD ($)
Apr. 16, 2023
USD ($)
Apr. 14, 2024
USD ($)
restaurant
reporting_unit
segment
Apr. 16, 2023
USD ($)
Net Investment Income [Line Items]        
Number of operating segments | segment     2  
Contractual obligation | $     $ 0.2 $ 0.1
Marketing and advertising expense | $ $ 7.8 $ 9.2 $ 18.2 $ 21.3
Number of reporting units | reporting_unit     2  
Jack in the Box restaurant operations        
Net Investment Income [Line Items]        
Contractual obligation (percent)     5.00% 5.00%
Del Taco        
Net Investment Income [Line Items]        
Contractual obligation (percent)     4.00%  
Company operated | Jack in the Box restaurant operations        
Net Investment Income [Line Items]        
Number of operating segments     144  
Company operated | Del Taco        
Net Investment Income [Line Items]        
Number of operating segments     166  
Franchise-operated | Jack in the Box restaurant operations        
Net Investment Income [Line Items]        
Number of operating segments     2,051  
Franchise-operated | Del Taco        
Net Investment Income [Line Items]        
Number of operating segments     429