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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, 2016 | Apr. 30, 2015
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] |  |  |  |  |
Number of stock options exercised |  |  |  | 261,000 |
Stock Based Compensation (Textual) |  |  |  |  |
Shares available for calculating intrinsic value (in shares) |  |  |  | 21,018,353 |
Nonqualified stock options to purchase of shares, exercise price |  |  | $ 35.62 |  |
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 on April 15, 2019 and December 16, 2018. |
Percentage of stock options which would get immediately vested on change of control |  |  | 100.00% |  |
Fair value of option at grant date (in dollars per share) |  |  | $ 11.43 |  |
Total compensation expense to be recognized per grant |  |  | $ 40.0 |  |
Compensation expense |  |  |  | $ 5.6 | $ 5.6
A. Jayson Adair, the Chief Executive Officer [Member] |  |  |  |  |
Stock Based Compensation (Textual) |  |  |  |  |
Nonqualified stock options to purchase of shares |  |  | 2,000,000 |  |
Vincent W. Mitz, the President [Member] |  |  |  |  |
Stock Based Compensation (Textual) |  |  |  |  |
Nonqualified stock options to purchase of shares |  |  | 1,500,000 |  |
Tranche One on December 16, 2014 [Member] | A. Jayson Adair, the Chief Executive Officer [Member] |  |  |  |  |
Stock Based Compensation (Textual) |  |  |  |  |
Percentage of total aggregate options vested |  | 20.00% |  |  |
Tranche Two on April 15, 2015 [Member] | A. Jayson Adair, the Chief Executive Officer [Member] |  |  |  |  |
Stock Based Compensation (Textual) |  |  |  |  |
Percentage of total aggregate options vested | 20.00% |  |  |  |
Tranche Three Vesting Monthly [Member] | A. Jayson Adair, the Chief Executive Officer [Member] |  |  |  |  |
Stock Based Compensation (Textual) |  |  |  |  |
Award vesting period |  |  | 4 years |  |

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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 Description of the deferred compensation arrangement, including fixed amounts and determinable awards, or the method for determining payments and awards, the timing of such payments and awards, and any requisite service or performance criteria, as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 710 -SubTopic 10 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6409961&loc=d3e20487-108367 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 + Details
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