CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($)	3 Months Ended		9 Months Ended
	Apr. 30, 2017	Apr. 30, 2016	Apr. 30, 2017	Apr. 30, 2016
Net sales
Product sales	$ 170,073,000	$ 153,795,000	$ 500,878,000	$ 426,303,000
Product service	22,040,000	19,908,000	63,777,000	59,450,000
Total net sales	192,113,000	173,703,000	564,655,000	485,753,000
Cost of sales
Product sales	84,681,000	78,902,000	250,052,000	221,022,000
Product service	15,984,000	14,480,000	45,171,000	40,875,000
Total cost of sales	100,665,000	93,382,000	295,223,000	261,897,000
Gross profit	91,448,000	80,321,000	269,432,000	223,856,000
Expenses:
Selling	30,509,000	26,887,000	85,312,000	70,967,000
General and administrative	29,204,000	26,106,000	87,672,000	70,555,000
Research and development	4,291,000	4,065,000	13,328,000	10,899,000
Total operating expenses	64,004,000	57,058,000	186,312,000	152,421,000
Income from operations	27,444,000	23,263,000	83,120,000	71,435,000
Interest expense	1,108,000	890,000	3,365,000	2,549,000
Interest income	(24,000)	(19,000)	(62,000)	(62,000)
Income before income taxes	26,360,000	22,392,000	79,817,000	68,948,000
Income taxes	8,849,000	8,373,000	25,436,000	25,286,000
Net income	$ 17,511,000	$ 14,019,000	$ 54,381,000	$ 43,662,000
Earnings per common share:
Basic (in dollars per share)	$ 0.42	$ 0.34	$ 1.30	$ 1.05
Diluted (in dollars per share)	$ 0.42	$ 0.34	1.30	1.05
Dividends per common share (in dollars per share)			$ 0.07	$ 0.06