CONSOLIDATED STATMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jan. 25, 2020	Jan. 26, 2019	Jan. 25, 2020	Jan. 26, 2019
Sales	$ 437,422	$ 428,128	$ 844,824	$ 829,678
Cost of sales	319,475	310,392	613,331	599,830
Gross profit	117,947	117,736	231,493	229,848
Operating and administrative expense	107,734	100,036	210,874	196,330
Depreciation and amortization	7,798	7,017	15,237	13,915
Operating income	2,415	10,683	5,382	19,603
Interest expense	(568)	(1,112)	(1,135)	(2,227)
Interest income	1,030	1,305	2,289	2,483
Income before income taxes	2,877	10,876	6,536	19,859
Income taxes	872	3,305	1,964	6,020
Net income	$ 2,005	$ 7,571	$ 4,572	$ 13,839
Common Class A [Member]
Net income per share:
Basic (in dollars per share)	$ 0.16	$ 0.59	$ 0.35	$ 1.08
Diluted (in dollars per share)	0.14	0.53	0.32	0.96
Common Class B [Member]
Net income per share:
Basic (in dollars per share)	0.10	0.38	0.23	0.70
Diluted (in dollars per share)	$ 0.10	$ 0.38	$ 0.23	$ 0.70