Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Apr. 30, 2017	Apr. 30, 2016	Apr. 30, 2017	Apr. 30, 2016
Net revenue:
Product	$ 120,791	$ 126,376	$ 371,373	$ 366,443
Engineering	1,371	1,604	3,448	4,354
Total net revenue	122,162	127,980	374,821	370,797
Cost of sales:
Product	68,667	71,340	210,149	202,410
Engineering	1,334	1,707	3,180	3,736
Total cost of sales	70,001	73,047	213,329	206,146
Gross profit	52,161	54,933	161,492	164,651
Operating expenses:
Research and product development	14,900	16,464	46,962	50,269
Selling and marketing	16,356	15,796	51,894	46,278
General and administrative	10,377	13,208	27,978	48,712
Restructuring	2,080	1,839	2,379	8,269
Asset impairment charges	73,051		83,474
Total operating expenses	116,764	47,307	212,687	153,528
(Loss) income from operations	(64,603)	7,626	(51,195)	11,123
Other income (expense), net	57	(934)	(357)	(4,899)
(Loss) income before income taxes	(64,546)	6,692	(51,552)	6,224
(Benefit) provision for income taxes	(4,882)	1,722	(1,934)	2,863
Net (loss) income	$ (59,664)	$ 4,970	$ (49,618)	$ 3,361
Net (loss) income per common share:
Basic	$ (4.78)	$ 0.40	$ (3.98)	$ 0.27
Diluted	$ (4.78)	$ 0.40	$ (3.98)	$ 0.27
Weighted average shares outstanding:
Basic	12,486	12,392	12,457	12,412
Diluted	12,486	12,553	12,457	12,623
Dividends declared and paid per share	$ 0.10	$ 0.10	$ 0.30	$ 0.30