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Basis Of Presentation (Details)
$ in Millions
4 Months Ended
Jan. 17, 2016
restaurant
Sep. 27, 2015
USD ($)
Jan. 18, 2015
restaurant
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]      
Current Deferred Tax Assets Reclassified to Noncurrent | $   $ 40.0  
Document Period End Date Jan. 17, 2016    
Document Fiscal Year Focus 2016    
Jack in the box brand restaurant operations [Member]      
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]      
Number of restaurants 2,253   2,253
Qdoba brand restaurant operations [Member]      
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]      
Number of restaurants 674   641
Entity Operated Units [Member] | Jack in the box brand restaurant operations [Member]      
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]      
Number of restaurants 413   431
Entity Operated Units [Member] | Qdoba brand restaurant operations [Member]      
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]      
Number of restaurants 330   311
Franchised Units [Member] | Jack in the box brand restaurant operations [Member]      
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]      
Number of restaurants 1,840   1,822
Franchised Units [Member] | Qdoba brand restaurant operations [Member]      
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]      
Number of restaurants 344   330
2013 Qdoba Closures [Member]      
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]      
Number of restaurants 62