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Stockholder's Equity (Details Textuals 3) (Management, USD $) In Millions, except Share data, unless otherwise specified | 12 Months Ended
--- | ---
Jul. 31, 2012 | Jul. 31, 2011 | Jul. 31, 2010
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 | $ 10.1

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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 AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 6, 7 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph 64, 65 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 4: 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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