CONSOLIDATED STATEMENTS OF INCOME (USD $)	12 Months Ended
	Jul. 31, 2013	Jul. 31, 2012	Jul. 31, 2011
CONSOLIDATED STATEMENTS OF INCOME
Net sales	$ 425,026,000	$ 386,490,000	$ 321,651,000
Cost of sales	241,550,000	222,323,000	198,868,000
Gross profit	183,476,000	164,167,000	122,783,000
Expenses:
Selling	57,786,000	55,166,000	44,144,000
General and administrative	53,182,000	47,623,000	40,655,000
Research and development	9,320,000	9,254,000	6,648,000
Total operating expenses	120,288,000	112,043,000	91,447,000
Income before interest, other expense and income taxes	63,188,000	52,124,000	31,336,000
Interest expense	2,895,000	3,732,000	960,000
Interest income	(61,000)	(82,000)	(86,000)
Other expense		605,000
Income before income taxes	60,354,000	47,869,000	30,462,000
Income taxes	21,115,000	16,532,000	10,037,000
Net income	$ 39,239,000	$ 31,337,000	$ 20,425,000
Earnings per common share:
Basic (in dollars per share)	$ 0.96	$ 0.78	$ 0.53
Diluted (in dollars per share)	$ 0.95	$ 0.77	$ 0.52
Dividends per common share (in dollars per share)	$ 0.07	$ 0.06	$ 0.05