CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Oct. 31, 2011	Oct. 31, 2010
Net revenue:
Product	$ 114,007	$ 96,689
Engineering	3,850	7,133
Total net revenue	117,857	103,822
Cost of sales:
Product	71,231	59,056
Engineering	3,600	5,747
Total cost of sales	74,831	64,803
Gross profit	43,026	39,019
Operating expenses:
Research and product development	15,267	13,904
Selling and marketing	10,465	9,608
General and administrative	11,710	9,747
Restructuring		3,562
Total operating expenses	37,442	36,821
Income from operations	5,584	2,198
Other income (expense):
Interest income	136	218
Other, net	175	(276)
Total other income (expense), net	311	(58)
Income from continuing operations before income taxes	5,895	2,140
Provision for income taxes	1,869	759
Income from continuing operations	4,026	1,381
Income from discontinued operations (net of income tax provision of $168)		289
Gain on disposal of discontinued operations (net of income tax provision of $505)		924
Net income	$ 4,026	$ 2,594
Basic net income per share:
Income from continuing operations	$ 0.32	$ 0.11
Income from discontinued operations, net of tax		$ 0.02
Gain on disposal of discontinued operations, net of tax		$ 0.08
Basic net income per share	$ 0.32	$ 0.21
Diluted net income per share:
Income from continuing operations	$ 0.32	$ 0.11
Income from discontinued operations, net of tax		$ 0.02
Gain on disposal of discontinued operations, net of tax		$ 0.07
Diluted net income per share	$ 0.32	$ 0.20
Weighted average shares outstanding:
Basic	12,437	12,623
Diluted	12,548	12,677