Condensed Consolidated Statements of Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jan. 31, 2019	Jan. 31, 2018	Jan. 31, 2019	Jan. 31, 2018
Net sales
Net sales	$ 224,538	$ 213,034	$ 450,127	$ 425,800
Cost of sales
Cost of sales	119,863	111,799	240,203	223,906
Gross profit	104,675	101,235	209,924	201,894
Expenses:
Selling	33,198	30,922	67,156	62,522
General and administrative	37,358	32,188	73,893	64,284
Research and development	7,923	5,643	15,001	10,972
Total operating expenses	78,479	68,753	156,050	137,778
Income from operations	26,196	32,482	53,874	64,116
Interest expense, net	2,207	1,135	4,233	2,324
Other income, net	(1,313)	0	(1,313)	(1,138)
Income before income taxes	25,302	31,347	50,954	62,930
Income taxes	6,502	(1,141)	12,912	7,513
Net income	$ 18,800	$ 32,488	$ 38,042	$ 55,417
Earnings per common share:
Basic (in dollars per share)	$ 0.45	$ 0.78	$ 0.91	$ 1.33
Diluted (in dollars per share)	0.45	0.78	0.91	1.33
Dividends declared per common share (in dollars per share)	$ 0.10	$ 0.09	$ 0.10	$ 0.09
Product sales
Net sales
Net sales	$ 194,013	$ 186,484	$ 389,773	$ 374,449
Cost of sales
Cost of sales	100,418	94,144	199,728	189,243
Product service
Net sales
Net sales	30,525	26,550	60,354	51,351
Cost of sales
Cost of sales	$ 19,445	$ 17,655	$ 40,475	$ 34,663