CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jan. 31, 2023	Jan. 31, 2022	Jan. 31, 2023	Jan. 31, 2022
Net sales	$ 326,249	$ 318,055	$ 648,818	$ 639,530
Cost of goods sold	169,809	168,693	337,114	335,180
Gross margin	156,440	149,362	311,704	304,350
Operating expenses:
Research and development	15,377	13,965	29,310	27,872
Selling, general and administrative	92,282	92,525	182,227	189,271
Total operating expenses	107,659	106,490	211,537	217,143
Operating income	48,781	42,872	100,167	87,207
Other income (expense):
Investment and other income (expense)	968	(578)	811	(35)
Interest expense	(1,239)	(252)	(2,133)	(434)
Income before income taxes	48,510	42,042	98,845	86,738
Income tax expense	10,524	8,227	21,418	17,877
Net income	$ 37,986	$ 33,815	$ 77,427	$ 68,861
Weighted average common shares outstanding:
Basic	49,745	51,800	49,806	51,887
Diluted	50,009	52,162	50,049	52,299
Class A Nonvoting Common Stock
Earnings Per Share
Basic	$ 0.76	$ 0.65	$ 1.55	$ 1.33
Diluted	0.76	0.65	1.55	1.32
Class B Voting Common Stock
Earnings Per Share
Basic	0.76	0.65	1.54	1.31
Diluted	$ 0.76	$ 0.65	$ 1.53	$ 1.30