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Share-Based Payments (Details Textual) (USD $)
In Thousands, except Share data, unless otherwise specified
12 Months Ended
Apr. 30, 2012
Y
Apr. 30, 2011
Apr. 30, 2010
Share-Based Payments (Textual) [Abstract]      
Shares available for future issuance 7,311,613    
Weighted-average remaining contractual term for stock options outstanding and exercisable, in years 1.8    
Intrinsic value of options exercised $ 2,644 $ 13,355 $ 5,876
Restricted stock, vesting period (in Years) 4 years    
Aggregate intrinsic value of stock options 4,675    
Fair value of equity awards other than stock options vesting $ 22,663 $ 17,680 $ 16,273