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Stockholder's Equity (Details 3) (USD $) In Thousands, except Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Apr. 30, 2012 | Jan. 31, 2012 | Oct. 31, 2011 | Jul. 31, 2011 | Apr. 30, 2011 | Jan. 31, 2011 | Jul. 31, 2010 | Oct. 31, 2009 | Jul. 31, 2012 Stock Options | Jul. 31, 2011 Stock Options
Number Of Options [Roll Forward] |  |  |  |  |  |  |  |  |  |
Outstanding at July 31, 2011 (in shares) |  |  |  |  |  |  |  |  | 16,705,000 |
Grants of options (in shares) |  |  |  |  |  |  |  |  | 880,000 |
Exercise of stock options, net of repurchased shares (in shares) | 322,520 | 20,000 | 40,000 | 180,000 | 548,334 | 177,500 | 700,000 | 647,262 | (1,367,000) |
Forfeitures or expirations (in shares) |  |  |  |  |  |  |  |  | (39,000) |
Outstanding at July 31, 2012 (in shares) |  |  |  |  |  |  |  |  | 16,179,000 | 16,705,000
Exercisable at July 31, 2012 (in shares) |  |  |  |  |  |  |  |  | 10,166,000 |
Vested and expected to vest at July 31, 2012 (in shares) |  |  |  |  |  |  |  |  | 15,533,000 |
Weighted Average Exercise Price [Roll Forward] |  |  |  |  |  |  |  |  |  |
Outstanding at July 31, 2011 (in dollars per share) |  |  |  |  |  |  |  |  | $ 15.50 |
Grants of options (in dollars per share) |  |  |  |  |  |  |  |  | $ 22.54 |
Exercises (in dollars per share) | $ 10.74 | $ 9.00 | $ 9.00 | $ 9.48 | $ 11.02 | $ 8.47 | $ 6.46 | $ 6.52 | $ 11.58 |
Forfeitures or expirations (in dollars per share) |  |  |  |  |  |  |  |  | $ 16.43 |
Outstanding at July 31, 2012 (in dollars per share) |  |  |  |  |  |  |  |  | $ 16.24 | $ 15.50
Exercisable at July 31, 2012 (in dollars per share) |  |  |  |  |  |  |  |  | $ 15.38 |
Vested and expected to vest at July 31, 2012 (in dollars per share) |  |  |  |  |  |  |  |  | $ 16.21 |
Weighted-Average Remaining Contractual Term [Roll Forward] |  |  |  |  |  |  |  |  |  |
Outstanding |  |  |  |  |  |  |  |  | 6 years 7 months 6 days | 7 years 2 months 16 days
Exercisable at July 31, 2012 |  |  |  |  |  |  |  |  | 6 years 7 days |
Vested and expected to vest at July 31, 2012 |  |  |  |  |  |  |  |  | 6 years 7 months 9 days |
Aggregate Intrinsic Value [Roll Forward] |  |  |  |  |  |  |  |  |  |
Outstanding at July 31, 2011 |  |  |  |  |  |  |  |  | $ 103,979 |
Outstanding at July 31, 2012 |  |  |  |  |  |  |  |  | 121,977 | 103,979
Exercisable at July 31, 2012 |  |  |  |  |  |  |  |  | 85,146 |
Vested and expected to vest at July 31, 2012 |  |  |  |  |  |  |  |  | $ 117,326 |

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- Definition Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3)-(4) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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