CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($)	3 Months Ended		9 Months Ended
	Apr. 30, 2016	Apr. 30, 2015	Apr. 30, 2016	Apr. 30, 2015
Net sales
Product sales	$ 153,795,000	$ 123,070,000	$ 426,303,000	$ 361,219,000
Product services	19,908,000	18,438,000	59,450,000	52,530,000
Total net sales	173,703,000	141,508,000	485,753,000	413,749,000
Cost of sales
Product sales	78,902,000	64,664,000	221,022,000	191,833,000
Product services	14,480,000	13,245,000	40,875,000	37,212,000
Total cost of sales	93,382,000	77,909,000	261,897,000	229,045,000
Gross profit	80,321,000	63,599,000	223,856,000	184,704,000
Expenses:
Selling	26,887,000	20,326,000	70,967,000	58,994,000
General and administrative	26,106,000	18,456,000	70,555,000	56,785,000
Research and development	4,065,000	3,536,000	10,899,000	10,296,000
Total operating expenses	57,058,000	42,318,000	152,421,000	126,075,000
Income from operations	23,263,000	21,281,000	71,435,000	58,629,000
Interest expense	890,000	636,000	2,549,000	1,847,000
Interest income	(19,000)	(17,000)	(62,000)	(48,000)
Loss on sale of business		2,206,000		2,206,000
Income before income taxes	22,392,000	18,456,000	68,948,000	54,624,000
Income taxes	8,373,000	6,100,000	25,286,000	19,944,000
Net income	$ 14,019,000	$ 12,356,000	$ 43,662,000	$ 34,680,000
Earnings per common share:
Basic (in dollars per share)	$ 0.34	$ 0.30	$ 1.05	$ 0.84
Diluted (in dollars per share)	$ 0.34	$ 0.30	1.05	0.83
Dividends per common share (in dollars per share)			$ 0.06	$ 0.05