CONSOLIDATED STATEMENTS OF INCOME - USD ($)	12 Months Ended
	Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2014
Net sales
Product sales	$ 584,750,000	$ 493,656,000	$ 434,531,000
Product service	80,005,000	71,348,000	54,218,000
Total net sales	664,755,000	565,004,000	488,749,000
Cost of sales
Product sales	300,704,000	260,903,000	236,429,000
Product service	54,865,000	50,634,000	39,021,000
Total cost of sales	355,569,000	311,537,000	275,450,000
Gross profit	309,186,000	253,467,000	213,299,000
Expenses:
Selling	99,062,000	80,787,000	66,519,000
General and administrative	97,463,000	77,897,000	65,039,000
Research and development	15,410,000	14,022,000	10,813,000
Total operating expenses	211,935,000	172,706,000	142,371,000
Income from operations	97,251,000	80,761,000	70,928,000
Interest expense	3,408,000	2,432,000	2,380,000
Interest income	(88,000)	(68,000)	(63,000)
Loss on sale of business		2,206,000
Income before income taxes	93,931,000	76,191,000	68,611,000
Income taxes	33,978,000	28,238,000	25,346,000
Net income	$ 59,953,000	$ 47,953,000	$ 43,265,000
Earnings per common share:
Basic (in dollars per share)	$ 1.44	$ 1.16	$ 1.05
Diluted (in dollars per share)	1.44	1.15	1.04
Dividends per common share (in dollars per share)	$ 0.12	$ 0.10	$ 0.09