Subsequent Events (Details)	3 Months Ended				4 Months Ended	9 Months Ended
	Oct. 01, 2017 $ / shares	Jul. 09, 2017 restaurant $ / shares	Apr. 16, 2017 $ / shares	Jul. 03, 2016 restaurant $ / shares	Jan. 22, 2017 $ / shares	Jul. 09, 2017 restaurant $ / shares	Jul. 03, 2016 restaurant $ / shares
Subsequent Event [Line Items]
Common Stock, Dividends, Per Share, Declared		$ 0.40	$ 0.40	$ 0.30	$ 0.40	$ 1.20	$ 0.90
Subsequent Event [Member]
Subsequent Event [Line Items]
Common Stock, Dividends, Per Share, Declared	$ 0.40
Jack in the box brand restaurant operations [Member]
Subsequent Event [Line Items]
Number of Restaurants | restaurant		2,255		2,254		2,255	2,254