CONDENSED CONSOLIDATED STATEMENTS OF INCOME (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jan. 27, 2017	Jan. 29, 2016	Jan. 27, 2017	Jan. 29, 2016
CONDENSED CONSOLIDATED STATEMENTS OF INCOME (Unaudited) [Abstract]
Total revenue	$ 772,682	$ 764,002	$ 1,482,653	$ 1,466,631
Cost of goods sold (exclusive of depreciation and rent)	254,920	264,932	468,029	487,905
Labor and other related expenses	259,270	251,935	508,374	496,257
Other store operating expenses	140,979	141,103	278,905	276,810
Store operating income	117,513	106,032	227,345	205,659
General and administrative expenses	34,817	35,507	68,905	69,826
Operating income	82,696	70,525	158,440	135,833
Interest expense	3,638	3,569	7,314	7,113
Income before income taxes	79,058	66,956	151,126	128,720
Provision for income taxes	26,331	18,714	50,044	39,613
Net income	$ 52,727	$ 48,242	$ 101,082	$ 89,107
Net income per share:
Basic (in dollars per share)	$ 2.19	$ 2.02	$ 4.21	$ 3.72
Diluted (in dollars per share)	$ 2.19	$ 2.01	$ 4.19	$ 3.70
Weighted average shares:
Basic (in shares)	24,040,243	23,937,812	24,020,976	23,947,183
Diluted (in shares)	24,109,000	24,047,042	24,106,748	24,060,047
Dividends declared per share (in dollars per share)	$ 1.15	$ 1.10	$ 3.30	$ 2.20
Dividends paid per share (in dollars per share)	$ 1.15	$ 1.10	$ 3.30	$ 5.20