CONSOLIDATED STATMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Apr. 28, 2018	Apr. 29, 2017	Apr. 28, 2018	Apr. 29, 2017
Sales	$ 394,608	$ 391,984	$ 1,198,464	$ 1,193,891
Cost of sales	285,731	283,648	873,422	869,668
Gross profit	108,877	108,336	325,042	324,223
Operating and administrative expense	93,780	91,536	282,138	277,060
Depreciation and amortization	6,083	6,062	18,704	18,358
Operating income	9,014	10,738	24,200	28,805
Interest expense	(1,133)	(1,111)	(3,340)	(3,343)
Interest income	1,012	726	2,776	2,063
Income before income taxes	8,893	10,353	23,636	27,525
Income taxes	2,351	4,338	4,566	11,408
Net income	$ 6,542	$ 6,015	$ 19,070	$ 16,117
Common Class A [Member]
Net income per share:
Basic (in dollars per share)	$ 0.51	$ 0.47	$ 1.48	$ 1.27
Diluted (in dollars per share)	0.45	0.42	1.32	1.13
Common Class B [Member]
Net income per share:
Basic (in dollars per share)	0.33	0.30	0.96	0.82
Diluted (in dollars per share)	$ 0.33	$ 0.30	$ 0.96	$ 0.82