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Stock-based Payment Compensation (Details Textual) - USD ($) $ / shares in Units, $ in Millions |  |  | 1 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Apr. 15, 2015 | Dec. 16, 2014 | Oct. 31, 2013 | Apr. 30, 2018 | Apr. 30, 2017 | Jan. 31, 2014
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] |  |  |  |  |  |
Number of stock options exercised |  |  |  | 1,623,000 |  |
Stock Based Compensation (Textual) |  |  |  |  |  |
Shares available for calculating intrinsic value (in shares) |  |  |  | 19,387,379 |  |
Nonqualified stock options to purchase of 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 |  |  |
Deferred compensation arrangement with individual, description |  |  |  | Each option will become fully vested, assuming continued service by Mr. Adair and Mr. Mitz on April 15, 2019 and December 16, 2018. |  |
Fair value of option at grant date (in dollars per share) |  |  | $ 5.72 |  |  |
Total compensation expense to be recognized per grant |  |  |  |  |  | $ 40.0
Compensation expense |  |  |  | $ 5.4 | $ 5.6 |
Vincent W. Mitz, the President |  |  |  |  |  |
Stock Based Compensation (Textual) |  |  |  |  |  |
Nonqualified stock options to purchase of shares |  |  |  |  |  | 3,000,000
Chief Executive Officer [Member] |  |  |  |  |  |
Stock Based Compensation (Textual) |  |  |  |  |  |
Nonqualified stock options to purchase of shares |  |  |  |  |  | 4,000,000
Tranche One on December 16, 2014 | Vincent W. Mitz, the President |  |  |  |  |  |
Stock Based Compensation (Textual) |  |  |  |  |  |
Percentage of total aggregate options vested |  | 20.00% |  |  |  |
Tranche Two on April 15, 2015 | Chief Executive Officer [Member] |  |  |  |  |  |
Stock Based Compensation (Textual) |  |  |  |  |  |
Percentage of total aggregate options vested | 20.00% |  |  |  |  |
Tranche Three Vesting Monthly | Chief Executive Officer [Member] |  |  |  |  |  |
Stock Based Compensation (Textual) |  |  |  |  |  |
Award vesting period |  |  | 4 years |  |  |
October Grants [Member] |  |  |  |  |  |
Stock Based Compensation (Textual) |  |  |  |  |  |
Percentage Of Stock Options Immediately Vested On Termination Of Executive |  |  | 100.00% |  |  |
Percentage of stock options which would get immediately vested on change of control |  |  | 100.00% |  |  |

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