CONSOLIDATED STATMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Apr. 25, 2020	Apr. 27, 2019	Apr. 25, 2020	Apr. 27, 2019
Sales	$ 458,292	$ 395,458	$ 1,303,116	$ 1,225,137
Cost of sales	328,391	284,847	941,722	884,678
Gross profit	129,901	110,611	361,394	340,459
Operating and administrative expense	106,987	97,351	317,861	293,679
Depreciation and amortization	7,678	6,566	22,914	20,481
Operating income	15,236	6,694	20,619	26,299
Interest expense	(563)	(1,106)	(1,698)	(3,334)
Interest income	910	1,402	3,199	3,886
Income before income taxes	15,583	6,990	22,120	26,851
Income taxes	4,431	2,020	6,396	8,041
Net income	$ 11,152	$ 4,970	$ 15,724	$ 18,810
Common Class A [Member]
Net income per share:
Basic (in dollars per share)	$ 0.86	$ 0.39	$ 1.22	$ 1.46
Diluted (in dollars per share)	0.77	0.34	1.09	1.31
Common Class B [Member]
Net income per share:
Basic (in dollars per share)	0.56	0.25	0.79	0.95
Diluted (in dollars per share)	$ 0.56	$ 0.25	$ 0.79	$ 0.95