Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended										12 Months Ended
	Jul. 27, 2018	[1]	Apr. 27, 2018	Jan. 26, 2018	Oct. 27, 2017	Jul. 28, 2017	[1]	Apr. 28, 2017	Jan. 27, 2017	Oct. 28, 2016	Aug. 03, 2018	Jul. 28, 2017	Jul. 29, 2016
Quarterly Financial Data (Unaudited) [Abstract]
Total revenue	$ 810,893		$ 721,413	$ 787,771	$ 710,368	$ 743,226		$ 700,410	$ 772,682	$ 709,971	$ 3,030,445	$ 2,926,289	$ 2,912,351
Store operating income	118,213		98,718	112,686	107,731	119,749		107,478	117,513	109,832	437,348	454,572	423,453
Income before income taxes	78,494		59,715	72,994	67,220	79,672		68,089	79,058	72,068	278,423	298,887	266,419
Net income	$ 61,354		$ 48,747	$ 91,139	$ 46,380	$ 53,893		$ 46,924	$ 52,727	$ 48,355	$ 247,620	$ 201,899	$ 189,299
Net income per share - basic (in dollars per share)	$ 2.56		$ 2.03	$ 3.80	$ 1.93	$ 2.24		$ 1.95	$ 2.19	$ 2.01	$ 10.31	$ 8.40	$ 7.91
Net income per share - diluted (in dollars per share)	$ 2.55		$ 2.03	$ 3.79	$ 1.92	$ 2.23		$ 1.95	$ 2.19	$ 2.01	$ 10.29	$ 8.37	$ 7.86

[1] The Company's fourth quarter of fiscal 2018 consisted of 14 weeks.