CONSOLIDATED CONDENSED STATMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jan. 28, 2017	Jan. 23, 2016	Jan. 28, 2017	Jan. 23, 2016
Sales	$ 412,215	$ 420,170	$ 801,907	$ 809,699
Cost of sales	300,977	307,444	586,021	591,487
Gross profit	111,238	112,726	215,886	218,212
Operating and administrative expense	94,393	95,243	185,524	186,581
Depreciation and amortization	6,233	6,060	12,296	12,018
Operating income	10,612	11,423	18,066	19,613
Interest expense	(1,114)	(1,125)	(2,230)	(2,252)
Interest income	648	565	1,335	1,128
Income before income taxes	10,146	10,863	17,171	18,489
Income taxes	4,154	4,579	7,070	7,775
Net income	$ 5,992	$ 6,284	$ 10,101	$ 10,714
Common Class A [Member]
Net income per share:
Basic (in dollars per share)	$ 0.47	$ 0.50	$ 0.80	$ 0.85
Diluted (in dollars per share)	0.42	0.44	0.71	0.76
Common Class B [Member]
Net income per share:
Basic (in dollars per share)	0.31	0.32	0.52	0.55
Diluted (in dollars per share)	$ 0.31	$ 0.32	$ 0.52	$ 0.55