CONDENSED CONSOLIDATED STATEMENTS OF INCOME (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Oct. 31, 2013	Oct. 31, 2012
CONDENSED CONSOLIDATED STATEMENTS OF INCOME
Net sales	$ 118,272	$ 99,681
Cost of sales	66,773	55,954
Gross profit	51,499	43,727
Expenses:
Selling	15,764	13,413
General and administrative	15,164	12,048
Research and development	2,259	2,294
Total operating expenses	33,187	27,755
Income before interest and income taxes	18,312	15,972
Interest expense	657	646
Interest income	(13)	(13)
Income before income taxes	17,668	15,339
Income taxes	6,483	5,763
Net income	$ 11,185	$ 9,576
Earnings per common share:
Basic (in dollars per share)	$ 0.27	$ 0.24
Diluted (in dollars per share)	$ 0.27	$ 0.23
Dividends per common share (in dollars per share)	$ 0.05	$ 0.04