XML 115 R59.htm IDEA: XBRL DOCUMENT v2.4.0.6
Business Acquisitions - Schedule of Purchase Price Allocation to Net Assets Acquired (Detail) (USD $)
In Thousands, unless otherwise specified
Apr. 30, 2013
Apr. 30, 2012
Business Acquisition [Line Items]    
Equipment $ 9,423 $ 606
Goodwill 14,222 502
Intangible assets 9,850 1,135
Current assets 1,422  
Current liabilities (7,009) (26)
Total $ 27,908 $ 2,217