CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jan. 31, 2022	Jan. 31, 2021	Jan. 31, 2022	Jan. 31, 2021
Net sales	$ 318,055	$ 265,838	$ 639,530	$ 543,065
Cost of goods sold	168,693	136,316	335,180	278,115
Gross margin	149,362	129,522	304,350	264,950
Operating expenses:
Research and development	13,965	9,876	27,872	20,079
Selling, general and administrative	92,525	82,234	189,271	165,271
Total operating expenses	106,490	92,110	217,143	185,350
Operating income	42,872	37,412	87,207	79,600
Other (expense) income:
Investment and other (expense) income	(578)	2,036	(35)	2,191
Interest expense	(252)	(51)	(434)	(157)
Income before income taxes and losses of unconsolidated affiliate	42,042	39,397	86,738	81,634
Income tax expense	8,227	8,206	17,877	16,788
Income before losses of unconsolidated affiliate	33,815	31,191	68,861	64,846
Equity in losses of unconsolidated affiliate	0	(331)	0	(505)
Net income	$ 33,815	$ 30,860	$ 68,861	$ 64,341
Weighted average common shares outstanding:
Basic	51,800	52,018	51,887	52,020
Diluted	52,162	52,282	52,299	52,288
Class A Nonvoting Common Stock [Member]
Earnings Per Share
Basic	$ 0.65	$ 0.59	$ 1.33	$ 1.24
Diluted	0.65	0.59	1.32	1.23
Class B Voting Common Stock [Member]
Earnings Per Share
Basic	0.65	0.59	1.31	1.22
Diluted	$ 0.65	$ 0.59	$ 1.30	$ 1.21