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Intangible Assets (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Apr. 30, 2014
Apr. 30, 2013
Intangible Assets [Line Items]    
Weighted-Average Amortization Period (in years) 11 years  
Amortized intangible assets, Gross $ 66,551 $ 66,551
Amortized intangible assets, Accumulated Amortization (20,777) (12,115)
Amortized intangible assets, Net 45,774 54,436
Exchange rate fluctuations (14) (49)
Intangible assets 49,560 58,187
Customer Lists
    
Intangible Assets [Line Items]    
Weighted-Average Amortization Period (in years) 10 years  
Amortized intangible assets, Gross 34,899 34,899
Amortized intangible assets, Accumulated Amortization (8,674) (4,887)
Amortized intangible assets, Net 26,225 30,012
Database Rights
    
Intangible Assets [Line Items]    
Weighted-Average Amortization Period (in years) 10 years  
Amortized intangible assets, Gross 4,256 4,256
Amortized intangible assets, Accumulated Amortization (1,925) (1,500)
Amortized intangible assets, Net 2,331 2,756
Intellectual Property
    
Intangible Assets [Line Items]    
Weighted-Average Amortization Period (in years) 20 years  
Amortized intangible assets, Gross 22,900 22,900
Amortized intangible assets, Accumulated Amortization (7,009) (3,887)
Amortized intangible assets, Net 15,891 19,013
Trademarks
    
Intangible Assets [Line Items]    
Weighted-Average Amortization Period (in years) 4 years  
Amortized intangible assets, Gross 3,686 3,686
Amortized intangible assets, Accumulated Amortization (2,559) (1,331)
Amortized intangible assets, Net 1,127 2,355
Non-compete Agreements
    
Intangible Assets [Line Items]    
Weighted-Average Amortization Period (in years) 5 years  
Amortized intangible assets, Gross 810 810
Amortized intangible assets, Accumulated Amortization (610) (510)
Amortized intangible assets, Net 200 300
Trademarks
    
Intangible Assets [Line Items]    
Unamortized intangible assets $ 3,800 $ 3,800