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BASIS OF PRESENTATION - Narrative (Details)
$ in Millions
4 Months Ended 12 Months Ended
Jan. 22, 2023
USD ($)
restaurant
Jan. 23, 2022
USD ($)
Oct. 02, 2022
USD ($)
Net Investment Income [Line Items]      
Contractual obligation | $ $ 0.1   $ 0.0
Marketing and advertising expense | $ $ 12.2 $ 6.1  
Jack in the Box      
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      
Net Investment Income [Line Items]      
Number of operating segments 140    
Company operated | Del Taco      
Net Investment Income [Line Items]      
Number of operating segments 273    
Franchise-operated | Jack in the Box      
Net Investment Income [Line Items]      
Number of operating segments 2,046    
Franchise-operated | Del Taco      
Net Investment Income [Line Items]      
Number of operating segments 319