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Estimated Annual Amortization Expense Related to Amortizing Intangible Assets (Detail) - USD ($)
$ in Thousands
Apr. 30, 2015
Apr. 30, 2014
Finite-Lived Intangible Liabilities [Line Items]    
2016 $ 7,907  
2017 6,332  
2018 5,648  
2019 4,394  
2020 4,110  
Thereafter 15,737  
Amortized intangible assets, Net $ 44,128 $ 45,774