CONSOLIDATED STATMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jan. 26, 2019	Jan. 27, 2018	Jan. 26, 2019	Jan. 27, 2018
Sales	$ 428,128	$ 418,269	$ 829,678	$ 805,609
Revenues			829,678	805,609
Cost of sales	310,392	304,802	599,830	587,350
Gross profit	117,736	113,467	229,848	218,259
Operating and administrative expense	100,036	97,248	196,330	190,452
Depreciation and amortization	7,017	6,386	13,915	12,621
Operating income	10,683	9,833	19,603	15,186
Interest expense	(1,112)	(1,102)	(2,227)	(2,207)
Interest income	1,305	864	2,483	1,764
Income before income taxes	10,876	9,595	19,859	14,743
Income taxes	3,305	84	6,020	2,215
Net income	$ 7,571	$ 9,511	$ 13,839	$ 12,528
Common Class A [Member]
Net income per share:
Basic (in dollars per share)	$ 0.59	$ 0.74	$ 1.08	$ 0.97
Diluted (in dollars per share)	0.53	0.66	0.96	0.87
Common Class B [Member]
Net income per share:
Basic (in dollars per share)	0.38	0.48	0.70	0.63
Diluted (in dollars per share)	$ 0.38	$ 0.48	$ 0.70	$ 0.63