CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Jul. 31, 2020	Jul. 31, 2019	Jul. 31, 2018
Net sales	$ 1,081,299	$ 1,160,645	$ 1,173,851
Cost of goods sold	552,734	581,967	585,560
Gross margin	528,565	578,678	588,291
Operating expenses:
Research and development	40,662	45,168	45,253
Selling, general and administrative	336,059	371,082	390,342
Total operating expenses	390,542	416,250	435,595
Operating income	138,023	162,428	152,696
Other income (expense):
Investment and other income	5,079	5,046	2,487
Interest expense	(2,166)	(2,830)	(3,168)
Income before income taxes and losses of unconsolidated affiliate	140,936	164,644	152,015
Income tax expense	28,321	33,386	60,955
Income (Loss) From Continuing Operations Before Income (Loss) From Equity Method Investments	112,615	131,258	91,060
Net income	$ 112,369	$ 131,258	$ 91,060
Weighted average common shares outstanding:
Basic (in shares)	52,763	52,596	51,677
Diluted (in shares)	53,231	53,323	52,524
Asset Impairment Charges	$ 13,821	$ 0	$ 0
Income (Loss) from Equity Method Investments	$ (246)	$ 0	$ 0
Class A Nonvoting Common Stock [Member]
Earnings per share:
Net income per share, basic	$ 2.13	$ 2.50	$ 1.76
Net income per share, diluted	2.11	2.46	1.73
Dividends	0.87	0.85	0.83
Class B Voting Common Stock [Member]
Earnings per share:
Net income per share, basic	2.11	2.48	1.75
Net income per share, diluted	2.10	2.45	1.72
Dividends	$ 0.85	$ 0.83	$ 0.81