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Share-Based Payments (Details Textual) (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended
Apr. 30, 2014
Apr. 30, 2013
Apr. 30, 2012
Share-Based Payments (Textual) [Abstract]      
Shares available for future issuance 6,896,730    
Aggregate intrinsic value of outstanding and exercisable stock options $ 1.8    
Intrinsic value of options exercised 0.8 3.4 2.6
Restricted stock, vesting period (in Years) 4 years    
Fair value of equity awards other than stock options vesting $ 20.8 $ 11.8 $ 22.7
Outstanding and exercisable options 33,667    
Remaining contractual term for stock options outstanding and exercisable Less than one year