CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($)	12 Months Ended
	Jul. 31, 2015	Jul. 31, 2014	Jul. 31, 2013
Net sales
Product sales	$ 493,656,000	$ 434,531,000	$ 383,520,000
Product service	71,348,000	54,218,000	41,506,000
Total net sales	565,004,000	488,749,000	425,026,000
Cost of sales
Product sales	260,903,000	236,429,000	210,433,000
Product service	50,634,000	39,021,000	31,117,000
Total cost of sales	311,537,000	275,450,000	241,550,000
Gross profit	253,467,000	213,299,000	183,476,000
Expenses:
Selling	80,787,000	66,519,000	57,786,000
General and administrative	77,897,000	65,039,000	53,182,000
Research and development	14,022,000	10,813,000	9,320,000
Total operating expenses	172,706,000	142,371,000	120,288,000
Income from operations	80,761,000	70,928,000	63,188,000
Interest expense	2,432,000	2,380,000	2,895,000
Interest income	(68,000)	(63,000)	(61,000)
Loss on sale of business	2,206,000
Income before income taxes	76,191,000	68,611,000	60,354,000
Income taxes	28,238,000	25,346,000	21,115,000
Net income	$ 47,953,000	$ 43,265,000	$ 39,239,000
Earnings per common share:
Basic (in dollars per share)	$ 1.16	$ 1.05	$ 0.96
Diluted (in dollars per share)	1.15	1.04	0.95
Dividends per common share (in dollars per share)	$ 0.10	$ 0.09	$ 0.07