Basis Of Presentation (Details) $ in Millions	Jul. 03, 2016 restaurant	Sep. 27, 2015 USD ($)	Jul. 05, 2015 restaurant
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]
Current Deferred Tax Assets Reclassified to Noncurrent | $		$ 40.0
Jack in the box brand restaurant operations [Member]
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]
Number of restaurants	2,254		2,248
Jack in the box brand restaurant operations [Member] | Entity Operated Units [Member]
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]
Number of restaurants	415		413
Jack in the box brand restaurant operations [Member] | Franchised Units [Member]
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]
Number of restaurants	1,839		1,835
Qdoba brand restaurant operations [Member]
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]
Number of restaurants	688		648
Qdoba brand restaurant operations [Member] | Entity Operated Units [Member]
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]
Number of restaurants	344		314
Qdoba brand restaurant operations [Member] | Franchised Units [Member]
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]
Number of restaurants	344		334