CONDENSED CONSOLIDATED STATEMENTS OF INCOME (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Apr. 30, 2013	Apr. 30, 2012	Apr. 30, 2013	Apr. 30, 2012
CONDENSED CONSOLIDATED STATEMENTS OF INCOME
Net sales	$ 105,009	$ 97,238	$ 311,053	$ 287,797
Cost of sales	59,525	54,619	176,691	166,407
Gross profit	45,484	42,619	134,362	121,390
Expenses:
Selling	15,096	14,240	42,232	40,433
General and administrative	13,766	12,388	38,196	36,582
Research and development	2,399	2,217	6,876	6,660
Total operating expenses	31,261	28,845	87,304	83,675
Income before interest, other expense and income taxes	14,223	13,774	47,058	37,715
Interest expense	749	897	2,186	2,928
Interest income	(16)	(13)	(45)	(67)
Other expense				605
Income before income taxes	13,490	12,890	44,917	34,249
Income taxes	4,492	4,716	15,891	12,561
Net income	$ 8,998	$ 8,174	$ 29,026	$ 21,688
Earnings per common share:
Basic (in dollars per share)	$ 0.33	$ 0.30	$ 1.07	$ 0.81
Diluted (in dollars per share)	$ 0.33	$ 0.30	$ 1.06	$ 0.80
Dividends per common share (in dollars per share)			$ 0.06	$ 0.05