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Stock-based Payment Compensation (Details Textual) - USD ($) $ / shares in Units, $ in Millions		1 Months Ended	9 Months Ended		64 Months Ended
	Apr. 15, 2015	Oct. 31, 2013	Apr. 30, 2019	Apr. 30, 2018	Apr. 15, 2019	Jan. 31, 2014
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Number of stock options exercised			4,054,000
Stock Based Compensation (Textual)
Shares available for calculating intrinsic value (in shares)			15,533,034
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
Fair value of option at grant date (in dollars per share)		$ 5.72
Compensation expense			$ 4.3	$ 5.4	$ 38.8
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] | Tranche One on December 16, 2014 | Vincent W. Mitz, the President
Stock Based Compensation (Textual)
Nonqualified stock options to purchase of shares						3,000,000
October Grants [Member] | Tranche Two on April 15, 2015 | Chief Executive Officer [Member]
Stock Based Compensation (Textual)
Nonqualified stock options to purchase of shares						4,000,000

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The compensation expense recognized during the period pertaining to the deferred compensation arrangement.

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The per share price that the individual must pay to acquire shares under the deferred compensation arrangement.

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Minimum period the individual is required to perform services to be fully vested under the deferred compensation arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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