CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Jul. 31, 2019	Jul. 31, 2018	Jul. 31, 2017
Net sales	$ 1,160,645	$ 1,173,851	$ 1,113,316
Cost of goods sold	581,967	585,560	555,024
Gross margin	578,678	588,291	558,292
Operating expenses:
Research and development	45,168	45,253	39,624
Selling, general and administrative	371,082	390,342	387,653
Total operating expenses	416,250	435,595	427,277
Operating income	162,428	152,696	131,015
Other income (expense):
Investment and other income	5,046	2,487	1,121
Interest expense	(2,830)	(3,168)	(5,504)
Income before income taxes	164,644	152,015	126,632
Income tax expense	33,386	60,955	30,987
Net income	$ 131,258	$ 91,060	$ 95,645
Weighted average common shares outstanding:
Basic (in shares)	52,596	51,677	51,056
Diluted (in shares)	53,323	52,524	51,956
Class A Nonvoting Common Stock [Member]
Earnings per share:
Net income per share, basic	$ 2.50	$ 1.76	$ 1.87
Net income per share, diluted	2.46	1.73	1.84
Dividends	0.85	0.83	0.82
Class B Voting Common Stock [Member]
Earnings per share:
Net income per share, basic	2.48	1.75	1.86
Net income per share, diluted	2.45	1.72	1.83
Dividends	$ 0.83	$ 0.81	$ 0.80