Goodwill and Intangible assets (Tables)

12 Months Ended

Jul. 31, 2011

Goodwill and Intangible Assets [Abstract]

Company's goodwill

	Amount
	(In thousands)
As of July 31, 2010	$	7,656
Goodwill acquired in acquisition		25,487
As of April 30, 2011	$	33,143

Company's total purchased intangible assets

	Estimated	Gross		Accumulated			Net
	Useful Lives	Value		Amortization			Value
	(In thousands, except estimated useful lives)
As of July 31, 2011
Existing technology	4 to 5 years	$	22,383	$	(10,595	)	$	11,788
In-process research and development	NA		1,020		—			1,020
Patents/core technology	4 to 6 years		6,026		(3,110	)		2,916
Customer contracts	6 to 7 years		6,933		(3,137	)		3,796
Support agreements	5 to 6 years		2,917		(1,849	)		1,068
Tradenames/trademarks	1 to 5 years		750		(529	)		221
Non-compete agreements	2 years		812		(758	)		54
Total		$	40,841	$	(19,978	)	$	20,863

	Estimated	Gross		Accumulated			Net
	Useful Lives	Value		Amortization			Value
	(In thousands, except estimated useful lives)
As of July 31, 2010
Existing technology	4 years	$	9,283	$	(5,914	)	$	3,369
Patents/core technology	4 years		3,046		(1,940	)		1,106
Customer contracts	6 to 7 years		5,083		(2,020	)		3,063
Support agreements	5 to 6 years		2,717		(1,284	)		1,433
Tradenames/trademarks	5 years		600		(284	)		316
Non-compete agreements	2 years		712		(712	)		—
Total		$	21,441	$	(12,154	)	$	9,287

Summary of amortization expense of intangible assets

	Years Ended July 31,
	2011		2010		2009
	(In thousands)
Cost of product revenues	$	5,852	$	3,082	$	3,082
Cost of professional services and support revenues		540		540		540
Sales and marketing		1,432		1,182		1,315
Total amortization expense	$	7,824	$	4,804	$	4,937

Estimated future amortization expense of purchased intangible assets

	Amount
	(In thousands)
Years ending July 31,
2012	$	6,519
2013		4,791
2014		4,083
2015		3,310
Thereafter		1,140
Total	$	19,843