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Goodwill And Intangible Assets (Intangible Assets) (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Apr. 30, 2012
Year
Apr. 30, 2011
Schedule Of Intangible Assets [Line Items]    
Weighted-Average Amortization Period (in years) 16  
Total amortized intangible assets $ 23,751 $ 23,426
Accumulated amortization (7,128) (4,937)
Total amortized intangible assets, net 16,623 18,489
Exchange rate fluctuations (10)  
Intangible assets 20,413 22,289
Intangible assets written-off   880
Intellectual Property [Member]
    
Schedule Of Intangible Assets [Line Items]    
Weighted-Average Amortization Period (in years) 24  
Total amortized intangible assets 11,400 11,400
Customer Lists [Member]
    
Schedule Of Intangible Assets [Line Items]    
Weighted-Average Amortization Period (in years) 7  
Total amortized intangible assets 6,399 6,399
Databases [Member]
    
Schedule Of Intangible Assets [Line Items]    
Weighted-Average Amortization Period (in years) 10  
Total amortized intangible assets 4,256 3,931
Trademarks [Member]
    
Schedule Of Intangible Assets [Line Items]    
Weighted-Average Amortization Period (in years) 5 [1]  
Total amortized intangible assets 1,186 [1] 1,186 [1]
Noncompete Agreements [Member]
    
Schedule Of Intangible Assets [Line Items]    
Weighted-Average Amortization Period (in years) 5  
Total amortized intangible assets 510 510
Trademarks [Member]
    
Schedule Of Intangible Assets [Line Items]    
Unamortized intangible assets $ 3,800 $ 3,800
[1] During fiscal 2011, the Company wrote-off a trademark no longer in use with a net book value of $0.9 million, which is included as a component of general and administrative expenses in the accompanying consolidated statements of income.