CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Jul. 31, 2021	Jul. 31, 2020	Jul. 31, 2019
Net sales	$ 1,144,698	$ 1,081,299	$ 1,160,645
Cost of goods sold	583,252	552,734	581,967
Gross margin	561,446	528,565	578,678
Operating expenses:
Research and development	44,551	40,662	45,168
Selling, general and administrative	349,768	336,059	371,082
Impairment charges	0	13,821	0
Total operating expenses	394,319	390,542	416,250
Operating income (1)	167,127	138,023	162,428
Other income (expense):
Investment and other income	4,333	5,079	5,046
Interest expense	(437)	(2,166)	(2,830)
Income before income taxes and losses of unconsolidated affiliate	171,023	140,936	164,644
Income tax expense	35,610	28,321	33,386
Income before losses of unconsolidated affiliate	135,413	112,615	131,258
Equity in losses of unconsolidated affiliate	(5,754)	(246)	0
Net income	$ 129,659	$ 112,369	$ 131,258
Weighted average common shares outstanding:
Basic	52,039	52,763	52,596
Diluted	52,409	53,231	53,323
Class A Nonvoting Common Stock
Earnings per share:
Basic	$ 2.49	$ 2.13	$ 2.50
Diluted	2.47	2.11	2.46
Dividends	0.88	0.87	0.85
Class B Voting Common Stock
Earnings per share:
Basic	2.48	2.11	2.48
Diluted	2.46	2.10	2.45
Dividends	$ 0.86	$ 0.85	$ 0.83