CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jan. 31, 2025	Jan. 31, 2024	Jan. 31, 2025	Jan. 31, 2024
Net sales	$ 356,675	$ 322,624	$ 733,740	$ 654,607
Cost of goods sold	180,832	160,541	368,208	320,805
Gross margin	175,843	162,083	365,532	333,802
Operating expenses:
Research and development	18,723	16,832	37,644	32,534
Selling, general and administrative	105,886	91,325	217,732	187,612
Total operating expenses	124,609	108,157	255,376	220,146
Operating income	51,234	53,926	110,156	113,656
Other income (expense):
Investment and other income	2,125	2,684	3,359	3,122
Interest expense	(1,312)	(790)	(2,668)	(1,556)
Income before income taxes	52,047	55,820	110,847	115,222
Income tax expense	11,713	12,192	23,730	24,353
Net income	$ 40,334	$ 43,628	$ 87,117	$ 90,869
Weighted average common shares outstanding:
Basic	47,851	48,374	47,792	48,440
Diluted	48,306	48,725	48,261	48,768
Class A Nonvoting Common Stock
Earnings Per Share
Basic	$ 0.84	$ 0.90	$ 1.82	$ 1.88
Diluted	0.83	0.90	1.81	1.86
Class B Voting Common Stock
Earnings Per Share
Basic	0.84	0.90	1.81	1.86
Diluted	$ 0.83	$ 0.90	$ 1.79	$ 1.85