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Estimated Annual Amortization Expense Related to Amortizing Intangible Assets (Detail) (USD $)
In Thousands, unless otherwise specified
Apr. 30, 2014
Apr. 30, 2013
Finite-Lived Intangible Assets [Line Items]    
2015 $ 8,081  
2016 7,017  
2017 5,701  
2018 5,008  
2019 3,754  
Thereafter 16,213  
Amortized intangible assets, Net $ 45,774 $ 54,436