Consolidated Statements of Operations and Comprehensive Income (Loss) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Jul. 31, 2014	Jul. 31, 2013	Jul. 31, 2012
Net product sales	$ 297,565	$ 117,997	$ 95,357
Net service sales	33,309	33,985	36,777
Net sales	330,874	151,982	132,134
Cost of sales	190,473	71,223	63,637
Gross profit	140,401	80,759	68,497
Engineering and product development expenses	60,733	52,314	49,864
Selling, general and administrative expenses	78,747	39,253	36,348
Amortization of purchased intangible assets	2,006	1,582	3,163
Restructuring	3,944	476	1,104
Loss from operations	(5,029)	(12,866)	(21,982)
Other (expense) income:
Interest expense	(2,210)	(233)	(179)
Interest income	494	883	910
Bargain purchase gain	8,621
Other (expense) income, net	(276)	(186)	444
Income (loss) before income taxes	1,600	(12,402)	(20,807)
Provision for (benefit from) income taxes	767	(275)	(938)
Net income (loss)	833	(12,127)	(19,869)
Net income (loss) per share:
Basic	$ 0.02	$ (0.25)	$ (0.40)
Diluted	$ 0.02	$ (0.25)	$ (0.40)
Weighted-average common shares used in computing net income (loss) per share:
Basic	48,214	47,719	49,080
Diluted	49,150	47,719	49,080
Comprehensive income (loss):
Net income (loss)	833	(12,127)	(19,869)
Unrealized gain (loss) on marketable securities	63	(294)	189
Change in pension liability	(15)
Unrealized loss on currency translation	(288)
Comprehensive income (loss)	$ 593	$ (12,421)	$ (19,680)