CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jan. 31, 2017	Jan. 31, 2016	Jan. 31, 2017	Jan. 31, 2016
Income Statement [Abstract]
Net sales	$ 79,071	$ 70,859	$ 155,566	$ 147,509
Cost of sales	47,869	42,626	94,681	90,016
Gross profit	31,202	28,233	60,885	57,493
Distribution expenses	9,770	8,819	18,872	18,948
Selling, general and administrative expenses	12,392	12,722	24,293	23,937
Restructuring charges		555		1,021
Realignment charges				130
Operating income	9,040	6,137	17,720	13,457
Other (expense) income
Interest expense, net	(172)	(252)	(349)	(404)
Other, net	(285)	149	(55)	132
Total other (expense) income, net	(457)	(103)	(404)	(272)
Income before income taxes	8,583	6,034	17,316	13,185
Provision for income taxes	(2,097)	(2,055)	(5,089)	(4,615)
Net income	$ 6,486	$ 3,979	$ 12,227	$ 8,570
Earnings per share
Net income per common share basic	$ 0.55	$ 0.34	$ 1.03	$ 0.73
Net income per common share diluted	$ 0.53	$ 0.33	$ 1.00	$ 0.72
Weighted average shares outstanding
Basic	11,882	11,717	11,881	11,707
Diluted	12,293	11,915	12,203	11,890