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Stockholder's Equity (Details 2) (Stock Options, USD $) | 12 Months Ended
--- | ---
Jul. 31, 2012 | Jul. 31, 2011 | Jul. 31, 2010
Stock Options |  |  |
Number Of Shares [Roll Forward] |  |  |
Non-vested shares at July 31, 2011 | 8,328,000 |  |
Grants of options | 880,000 |  |
Vested | (3,156,000) |  |
Forfeitures or expirations (in shares) | (39,000) |  |
Non-vested shares at July 31, 2012 | 6,013,000 | 8,328,000 |
Weighted Average Grant Date Fair Value [Roll Forward] |  |  |
Non-vested shares at July 31, 2011 | 6.66 |  |
Grants of options | $ 6.01 | $ 6.59 | $ 6.60
Vested | $ 6.63 |  |
Forfeitures or expirations | $ 5.33 |  |
Non-vested shares at July 31, 2012 | 6.59 | 6.66 |

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- Definition Represents the number of stock options vested during the reporting period. + References No definition available. + Details
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- Definition Represents weighted average grant date fair value of options forfeited and expired. + References No definition available. + Details
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- Definition The number of non-vested equity-based payment options, that validly exist and are outstanding as of the balance sheet date. + References No definition available. + Details
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- Definition Represents the weighted average grant date fair value of nonvested options. + References No definition available. + Details
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- Definition Represents the weighted average grant date fair value of options vested. + References No definition available. + 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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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph c(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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