Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jan. 31, 2017	Jan. 31, 2016	Jan. 31, 2017	Jan. 31, 2016
Net revenue:
Product	$ 130,330	$ 125,938	$ 250,582	$ 240,067
Engineering	1,204	1,931	2,077	2,750
Total net revenue	131,534	127,869	252,659	242,817
Cost of sales:
Product	72,721	68,123	141,482	131,070
Engineering	1,123	967	1,846	2,029
Total cost of sales	73,844	69,090	143,328	133,099
Gross profit	57,690	58,779	109,331	109,718
Operating expenses:
Research and product development	16,213	16,566	32,063	33,805
Selling and marketing	17,358	15,249	35,538	30,482
General and administrative	3,979	22,308	17,600	35,504
Restructuring	267	3,147	299	6,430
Asset impairment charges	10,423		10,423
Total operating expenses	48,240	57,270	95,923	106,221
Income from operations	9,450	1,509	13,408	3,497
Other income (expense), net	28	(3,507)	(414)	(3,965)
Income (loss) before income taxes	9,478	(1,998)	12,994	(468)
Provision for income taxes	1,968	987	2,948	1,141
Net income (loss)	$ 7,510	$ (2,985)	$ 10,046	$ (1,609)
Net income (loss) per common share:
Basic	$ 0.60	$ (0.24)	$ 0.81	$ (0.13)
Diluted	$ 0.59	$ (0.24)	$ 0.79	$ (0.13)
Weighted average shares outstanding:
Basic	12,466	12,418	12,442	12,422
Diluted	12,680	12,418	12,712	12,422
Dividends declared and paid per share	$ 0.10	$ 0.10	$ 0.20	$ 0.20