Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Apr. 30, 2015	Apr. 30, 2014	Apr. 30, 2015	Apr. 30, 2014
Net Revenue:
Product	$ 130,479	$ 122,067	$ 378,686	$ 369,992
Engineering	3,080	1,965	7,134	5,559
Total net revenue	133,559	124,032	385,820	375,551
Cost of sales:
Product	75,046	68,717	214,261	213,110
Engineering	2,560	1,961	6,114	5,067
Total cost of sales	77,606	70,678	220,375	218,177
Gross profit	55,953	53,354	165,445	157,374
Operating expenses:
Research and product development	17,156	16,915	50,950	55,795
Selling and marketing	15,928	14,338	47,283	43,603
General and administrative	15,339	12,764	42,634	40,624
Restructuring	(107)	(80)	(317)	216
Total operating expenses	48,316	43,937	140,550	140,238
Income from operations	7,637	9,417	24,895	17,136
Other income, net	201	882	150	104
Income before income taxes	7,838	10,299	25,045	17,240
(Benefit from) provision for income taxes	(1,286)	2,509	2,437	(6,089)
Net income	$ 9,124	$ 7,790	$ 22,608	$ 23,329
Net income per common share:
Basic	$ 0.73	$ 0.63	$ 1.82	$ 1.88
Diluted	$ 0.72	$ 0.62	$ 1.79	$ 1.84
Weighted average shares outstanding:
Basic	12,419	12,403	12,401	12,421
Diluted	12,603	12,647	12,601	12,679
Dividends declared and paid per share	$ 0.10	$ 0.10	$ 0.30	$ 0.30