CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Apr. 30, 2022	Apr. 30, 2021	Apr. 30, 2022	Apr. 30, 2021
Net sales	$ 338,551	$ 295,503	$ 978,081	$ 838,568
Cost of goods sold	174,525	146,656	509,705	424,771
Gross margin	164,026	148,847	468,376	413,797
Operating expenses:
Research and development	14,923	11,305	42,795	31,384
Selling, general and administrative	96,214	90,817	285,485	256,088
Total operating expenses	111,137	102,122	328,280	287,472
Operating income	52,889	46,725	140,096	126,325
Other (expense) income:
Investment and other (expense) income	(1,308)	1,181	(1,343)	3,372
Interest expense	(329)	(131)	(763)	(288)
Income before income taxes and losses of unconsolidated affiliate	51,252	47,775	137,990	129,409
Income tax expense	11,198	10,229	29,075	27,017
Income before losses of unconsolidated affiliate	40,054	37,546	108,915	102,392
Equity in losses of unconsolidated affiliate	0	(255)	0	(760)
Net income	$ 40,054	$ 37,291	$ 108,915	$ 101,632
Weighted average common shares outstanding:
Basic	51,326	52,050	51,700	52,030
Diluted	51,568	52,449	52,055	52,341
Class A Nonvoting Common Stock [Member]
Earnings Per Share
Basic	$ 0.78	$ 0.72	$ 2.11	$ 1.95
Diluted	0.78	0.71	2.09	1.94
Class B Voting Common Stock [Member]
Earnings Per Share
Basic	0.78	0.72	2.09	1.94
Diluted	$ 0.78	$ 0.71	$ 2.08	$ 1.93