Condensed Consolidated Statements Of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Oct. 31, 2012	Oct. 31, 2011
Net revenue:
Product	$ 112,547	$ 114,007
Engineering	7,320	3,850
Total net revenue	119,867	117,857
Cost of sales:
Product	68,674	71,231
Engineering	6,107	3,600
Total cost of sales	74,781	74,831
Gross profit	45,086	43,026
Operating expenses:
Research and product development	14,074	15,267
Selling and marketing	11,655	10,465
General and administrative	11,922	11,710
Total operating expenses	37,651	37,442
Income from operations	7,435	5,584
Other income (expense):
Interest income, net	113	136
Other income (expense), net	(1,019)	175
Total other income (expense), net	(906)	311
Income before income taxes	6,529	5,895
Provision for income taxes	2,148	1,869
Net income	$ 4,381	$ 4,026
Net income per common share:
Basic	$ 0.36	$ 0.32
Diluted	$ 0.35	$ 0.32
Weighted average shares outstanding:
Basic	12,323	12,437
Diluted	12,582	12,548