CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Apr. 30, 2021	Apr. 30, 2020	Apr. 30, 2021	Apr. 30, 2020
Net sales	$ 295,503	$ 265,943	$ 838,568	$ 829,555
Cost of goods sold	146,656	136,416	424,771	419,496
Gross margin	148,847	129,527	413,797	410,059
Operating expenses:
Research and development	11,305	9,814	31,384	31,298
Selling, general and administrative	90,817	83,223	256,088	260,136
Impairment charges	0	13,821	0	13,821
Total operating expenses	102,122	106,858	287,472	305,255
Operating income	46,725	22,669	126,325	104,804
Other income (expense):
Investment and other income	1,181	112	3,372	3,252
Interest expense	(131)	(628)	(288)	(1,976)
Income before income taxes and losses of unconsolidated affiliate	47,775	22,153	129,409	106,080
Income tax expense	10,229	8,520	27,017	21,396
Income before losses of unconsolidated affiliate	37,546	13,633	102,392	84,684
Equity in losses of unconsolidated affiliate	(255)	0	(760)	0
Net income	$ 37,291	$ 13,633	$ 101,632	$ 84,684
Weighted average common shares outstanding:
Basic	52,050	52,607	52,030	53,023
Diluted	52,449	52,972	52,341	53,512
Class A nonvoting common stock
Earnings Per Share
Basic	$ 0.72	$ 0.26	$ 1.95	$ 1.60
Diluted	0.71	0.26	1.94	1.58
Dividends	0.22	0.22	0.66	0.65
Common Class B
Earnings Per Share
Basic	0.72	0.26	1.94	1.58
Diluted	0.71	0.26	1.93	1.57
Dividends	$ 0.22	$ 0.22	$ 0.64	$ 0.64