Equity Incentive and Benefit Plans (Tables)

12 Months Ended

Jul. 31, 2011

Equity Incentive and Benefit Plans [Abstract]

Stock options outstanding

				Options Outstanding
							Weighted				Weighted
							Average		Weighted		Average
	Shares						Exercise		Average		Remaining		Aggregate
	Available for			Number of			Price		Fair Value		Contractual		Intrinsic
	Grant			Shares			per Share		per Share		Term (Years)		Value(1)
Balance at July 31, 2008		3,169,466			19,518,002		$	4.41				7.4	$	44,913,703
Shares reserved for issuance		4,141,807			—
Restricted stock awards granted		(1,626,631	)		—
Restricted stock awards forfeited		565,582			—
Options granted		(10,491,975	)		10,491,975			3.82	$	1.55
Options exercised		—			(1,436,068	)		1.35						4,874,878
Options repurchased		18,333			—			0.49
Options cancelled		7,031,994			(7,031,994	)		7.48
As of July 31, 2009		2,808,576			21,541,915			3.32				6.7		120,621,047
Shares reserved for issuance		4,337,195			—
Restricted stock awards granted		(1,733,374	)		—
Restricted stock awards forfeited		280,683			—
Options granted		(5,771,745	)		5,771,745			10.11		5.60
Options exercised		—			(2,974,218	)		2.73						28,722,784
Options repurchased		15,624			—			2.33
Options cancelled		698,918			(698,918	)		5.11
As of July 31, 2010		635,877			23,640,524			5.00				5.9		283,285,534
Shares reserved for issuance		4,680,314			—
Restricted stock awards granted		(4,460,081	)		—
Restricted stock awards forfeited		355,781			—
Options granted		(1,853,890	)		1,853,890			21.88	$	11.70
Options exercised		—			(6,413,368	)		4.64						137,156,274
Options cancelled		916,102			(916,102	)		10.11
As of July 31, 2011		274,103			18,164,944		$	6.59				5.0	$	297,688,111
Options vested and expected to vest as of July 31, 2011(2)					17,763,527		$	6.41				5.0	$	294,366,644
Options exercisable as of July 31, 2011					10,833,055		$	3.80				4.8	$	207,452,354

Unvested restricted stock awards and units

				Weighted Average
				Grant Date
				Fair Value
	Shares			per Share
As of July 31, 2008		3,364,950		$	6.81
Awards granted		1,626,631			4.67
Awards vested		(1,566,715	)		5.86
Awards forfeited		(565,582	)		6.31
As of July 31, 2009		2,859,284			6.21
Awards granted		1,733,374			11.51
Awards vested		(2,096,043	)		6.81
Awards forfeited		(280,683	)		6.56
As of July 31, 2010		2,215,932			9.74
Awards granted		4,460,081			24.46
Awards vested		(1,226,393	)		14.70
Awards forfeited		(355,781	)		16.24
As of July 31, 2011		5,093,839		$	20.98

Summary of shares issued and the weighted average purchase price per share

Purchase date		September 1, 2010
Shares issued		990,512
Weighted average purchase price per share	$	3.02
Purchase date		March 1, 2011
Shares issued		1,056,930
Weighted average purchase price per share	$	3.68

Employee Stock Options

	Years Ended July 31,
	2011			2010			2009
Risk-free interest rate		1.6	%		1.8	%		2.0	%
Expected term (in years)		4.0			4.3			4.2
Dividend yield		0			0			0
Volatility		70	%		71	%		66	%

Employee Stock Purchase Plan

	Years Ended July 31,
	2011		2010		2009
Risk-free interest rate		0.2% to 0.7%		0.2% to 1.0%		0.5% to 2.3%
Expected term (in years)		0.5 to 2.0		0.5 to 2.0		0.5 to 2.0
Dividend yield		0		0		0
Volatility		41% to 69%		43% to 81%		53% to 101%

Stock-based Expenses

	Years Ended July 31,
	2011		2010		2009
	(In thousands)
Stock options	$	19,324	$	16,154	$	11,741
Stock awards		38,636		15,954		10,247
Employee stock purchase plan		5,791		3,973		2,591
Total	$	63,751	$	36,081	$	24,579