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Stockholder's Equity (Details Textuals 3) (Management, USD $) In Millions, except Share data, unless otherwise specified | 12 Months Ended
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Jul. 31, 2013 | Jul. 31, 2012 | Jul. 31, 2011
Management |  |  |
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] |  |  |
Nonqualified stock options to purchase Of Shares | 4,000,000 |  |
Nonqualified stock options to purchase Of Shares Exercise Price | $ 15.11 |  |
Deferred compensation arrangement with individual - requisite service period | 5 years |  |
Deferred compensation arrangement with individual - maximum contractual term | Each option will become fully vested, assuming continued service, on April 14, 2014, the fifth anniversary of the date of grant. |  |
Term for not granting cash salary or bonus compensation in excess of $ 1.00 per year | 5 years |  |
Percentage of total aggregate options vested on April 14, 2010 | 20.00% |  |
Percentage of stock options which would get immediately vested on termination of executive | 100.00% |  |
Percentage of stock options which would get immediately vested on change of control | 100.00% |  |
The total compensation expense to be recognized per grant | $ 26.1 |  |
Recognized compensation expense | $ 10.2 | $ 10.2 | $ 10.2

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- Definition Represents the percentage of stock options immediately vested on termination of executive. + References No definition available. + Details
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- Definition Represents the percentage of stock options exercised as of specified date. + References No definition available. + Details
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- Definition The compensation expense recognized during the period pertaining to the deferred compensation arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 710 -SubTopic 10 -Section 30 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6409875&loc=d3e20015-108363 + Details
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- Definition The maximum number of shares authorized for issuance under the deferred compensation arrangement as of the balance sheet date. + 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 (a)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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