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Stockholder's Equity (Details Textuals 3) - USD ($) $ / shares in Units, $ in Millions | 1 Months Ended | 6 Months Ended | 12 Months Ended | 82 Months Ended |
--- | --- | --- | --- | --- | ---
Oct. 31, 2013 | Dec. 31, 2007 | Jan. 31, 2014 | Jul. 31, 2018 | Jul. 31, 2017 | Jul. 31, 2016 | Jul. 31, 2018 | Sep. 22, 2011
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] |  |  |  |  |  |  |  |
Stock Repurchase Program, Number of Shares Authorized to be Repurchased |  |  |  |  |  |  |  | 196,000,000
Stock Repurchased and Retired During Period, Shares |  |  |  | 0 |  | 5,877,038 | 106,913,602 |
Vesting term of second group of options | 4 years |  |  |  |  |  |  |
Equity Incentive 2007 Plan |  |  |  |  |  |  |  |
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] |  |  |  |  |  |  |  |
Maximum vesting term for incentive and non-qualified stock options determined by board of directors |  | 10 years |  |  |  |  |  |
Share-based compensation arrangement by share-based payment award, award requisite service period |  | 5 years |  |  |  |  |  |
October 2013 Grants |  |  |  |  |  |  |  |
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] |  |  |  |  |  |  |  |
Nonqualified stock options to purchase shares, exercise price |  |  | $ 17.81 |  |  |  |  |
Term for not granting cash salary or bonus compensation in excess of $ 1.00 per year | 5 years |  |  |  |  |  |  |
Deferred compensation arrangement with individual - requisite service period | 5 years |  |  |  |  |  |  |
Percentage of total aggregate options vested on April 14, 2010 | 20.00% |  |  |  |  |  |  |
Deferred compensation arrangement with individual - maximum contractual term | Each option will become fully vested, assuming continued service, on April 15, 2019 and December 16, 2018, respectively. |  |  |  |  |  |  |
Total compensation expense to be recognized per grant |  |  | $ 40.0 |  |  |  |  |
Recognized compensation expense |  |  |  | $ 7.2 | $ 7.5 | $ 7.5 |  |
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% |  |  |  |  |  |  |
Fair value of each option of grant | $ 5.72 |  |  |  |  |  |  |
A. Jayson Adair | October 2013 Grants |  |  |  |  |  |  |  |
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] |  |  |  |  |  |  |  |
Nonqualified stock options to purchase shares |  |  | 4,000,000 |  |  |  |  |
Vincent W. Mitz | October 2013 Grants |  |  |  |  |  |  |  |
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] |  |  |  |  |  |  |  |
Nonqualified stock options to purchase shares |  |  | 3,000,000 |  |  |  |  |
Common Stock [Member] |  |  |  |  |  |  |  |
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] |  |  |  |  |  |  |  |
Stock Repurchased and Retired During Period Cost Per Share |  |  |  |  |  | $ 20.065 |  |

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