Consolidated Statements of Operations and Comprehensive Income (Loss) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Oct. 31, 2013	Oct. 31, 2012
Net product sales	$ 24,281	$ 34,326
Net service sales	8,486	8,862
Net sales	32,767	43,188
Cost of sales	15,636	19,684
Gross profit	17,131	23,504
Engineering and product development expenses	12,878	12,392
Selling, general and administrative expenses	10,925	10,006
Amortization of purchased intangible assets	193	396
Restructuring	0	231
(Loss) income from operations	(6,865)	479
Other (expense) income:
Interest expense	(62)	(50)
Interest income	187	261
Other (expense), net	(20)	(2)
(Loss) income before provision for income taxes	(6,760)	688
Provision for income taxes	140	139
Net (loss) income	(6,900)	549
Net (loss) income per share:
Basic and diluted	$ (0.14)	$ 0.01
Weighted-average common and common equivalent shares used in computing net (loss) income per share:
Basic	47,900	48,303
Diluted	47,900	48,711
Comprehensive (loss) income:
Net (loss) income	(6,900)	549
Unrealized gain (loss) on marketable securities	103	(3)
Comprehensive (loss) income	$ (6,797)	$ 546