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Business Combinations - Schedule of Purchase Price Paid for Acquisitions (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Apr. 30, 2014
Apr. 30, 2013
Apr. 30, 2012
Business Acquisition [Line Items]      
Cash used in acquisitions, net of cash acquired $ 8,305 $ 25,225 $ 2,102
Excess purchase price to be allocated to goodwill 119,139 115,928 101,706
BBI Acquisition [Member]
      
Business Acquisition [Line Items]      
Cash used in acquisitions, net of cash acquired 7,860 25,225  
Common stock issued   2,650  
Other non-cash considerations 555    
Contingent consideration and holdbacks 1,653 33  
Total 10,068 27,908  
Current assets 814 1,422  
Equipment 2,010 9,423  
Other liabilities, net (241) (7,009)  
Intangible assets 4,302 9,850  
Fair value of assets acquired and liabilities assumed 6,885 13,686  
Excess purchase price to be allocated to goodwill $ 3,183 $ 14,222