CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jan. 31, 2024	Jan. 31, 2023	Jan. 31, 2024	Jan. 31, 2023
Net sales	$ 322,624	$ 326,249	$ 654,607	$ 648,818
Cost of goods sold	160,541	169,809	320,805	337,114
Gross margin	162,083	156,440	333,802	311,704
Operating expenses:
Research and development	16,832	15,377	32,534	29,310
Selling, general and administrative	91,325	92,282	187,612	182,227
Total operating expenses	108,157	107,659	220,146	211,537
Operating income	53,926	48,781	113,656	100,167
Other income (expense):
Investment and other income	2,684	968	3,122	811
Interest expense	(790)	(1,239)	(1,556)	(2,133)
Income before income taxes	55,820	48,510	115,222	98,845
Income tax expense	12,192	10,524	24,353	21,418
Net income	$ 43,628	$ 37,986	$ 90,869	$ 77,427
Weighted average common shares outstanding:
Basic	48,374	49,745	48,440	49,806
Diluted	48,725	50,009	48,768	50,049
Class A Nonvoting Common Stock
Earnings Per Share
Basic	$ 0.90	$ 0.76	$ 1.88	$ 1.55
Diluted	0.90	0.76	1.86	1.55
Class B Voting Common Stock
Earnings Per Share
Basic	0.90	0.76	1.86	1.54
Diluted	$ 0.90	$ 0.76	$ 1.85	$ 1.53