CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jan. 31, 2019	Jan. 31, 2018	Jan. 31, 2019	Jan. 31, 2018
Net sales	$ 282,426	$ 287,780	$ 575,622	$ 577,931
Cost of products sold	142,616	144,088	289,273	288,174
Gross margin	139,810	143,692	286,349	289,757
Operating expenses:
Research and development	11,074	11,314	22,400	21,834
Selling, general and administrative	92,706	97,582	187,297	197,716
Total operating expenses	103,780	108,896	209,697	219,550
Operating income	36,030	34,796	76,652	70,207
Other income (expense):
Investment and other income	1,377	1,056	1,360	1,272
Interest expense	(717)	(829)	(1,429)	(1,692)
Earnings before income taxes	36,690	35,023	76,583	69,787
Income tax expense	7,463	30,750	16,719	39,678
Net earnings	$ 29,227	$ 4,273	$ 59,864	$ 30,109
Weighted average common shares outstanding (in thousands):
Basic	52,532	51,698	52,366	51,569
Diluted	53,206	52,719	53,082	52,551
Class A nonvoting common stock
Earnings Per Share
Net earnings per share, basic	$ 0.56	$ 0.08	$ 1.14	$ 0.58
Net earnings per share, diluted	0.55	0.08	1.13	0.57
Dividends	0.21	0.21	0.43	0.42
Class B voting common stock
Earnings Per Share
Net earnings per share, basic	0.56	0.08	1.13	0.57
Net earnings per share, diluted	0.55	0.08	1.11	0.56
Dividends	$ 0.21	$ 0.21	$ 0.41	$ 0.40