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Stock-based Compensation (Details Textual) (USD $)
In Millions, except Share data, unless otherwise specified
 6 Months Ended
Oct. 31, 2013
Stock Based Compensation Textual [Abstract]  
Shares available for calculating intrinsic value (in shares) 19,417,361
Nonqualified stock options to purchase of shares, exercise price $ 35.62
Deferred compensation arrangement with individual - requisite service period Five years
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.
Term for not granting cash salary or bonus compensation in excess of $ 1.00 per year 5 years
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%
Value of option at the date of grant $ 11.43
Total compensation expense to be recognized per grant $ 40.0
A. Jayson Adair, the Chief Executive Officer
  
Stock Based Compensation Textual [Abstract]  
Nonqualified stock options to purchase of shares 2,000,000
Percentage of total aggregate options vested 20.00%
Vincent W. Mitz, the President
  
Stock Based Compensation Textual [Abstract]  
Nonqualified stock options to purchase of shares 1,500,000
Percentage of total aggregate options vested 20.00%