CONSOLIDATED STATMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Apr. 27, 2019	Apr. 28, 2018	Apr. 27, 2019	Apr. 28, 2018
Sales	$ 395,458	$ 395,437	$ 1,225,137	$ 1,201,045
Cost of sales	284,847	285,608	884,678	872,959
Gross profit	110,611	109,829	340,459	328,086
Operating and administrative expense	97,351	94,732	293,680	285,182
Depreciation and amortization	6,566	6,083	20,481	18,704
Operating income	6,694	9,014	26,298	24,200
Interest expense	(1,106)	(1,133)	(3,334)	(3,340)
Interest income	1,402	1,012	3,886	2,776
Income before income taxes	6,990	8,893	26,850	23,636
Income taxes	2,020	2,351	8,040	4,566
Net income	$ 4,970	$ 6,542	$ 18,810	$ 19,070
Common Class A [Member]
Net income per share:
Basic (in dollars per share)	$ 0.39	$ 0.51	$ 1.46	$ 1.48
Diluted (in dollars per share)	0.35	0.45	1.31	1.32
Common Class B [Member]
Net income per share:
Basic (in dollars per share)	0.25	0.33	0.95	0.96
Diluted (in dollars per share)	$ 0.25	$ 0.33	$ 0.95	$ 0.96