Subsequent Events (Details)		3 Months Ended			4 Months Ended	9 Months Ended
	Aug. 03, 2018 $ / shares	Jul. 08, 2018 restaurant $ / shares	Apr. 15, 2018 $ / shares	Jul. 09, 2017 $ / shares	Jan. 21, 2018 $ / shares	Jul. 08, 2018 restaurant $ / shares	Jul. 09, 2017 $ / shares	Apr. 16, 2017 restaurant
Subsequent Event [Line Items]
Cash dividends declared per common share		$ 0.4	$ 0.40	$ 0.40	$ 0.40	$ 1.20	$ 1.20
Number of Restaurants | restaurant		2,241				2,241		2,255
Subsequent Event
Subsequent Event [Line Items]
Cash dividends declared per common share	$ 0.40