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Estimated Annual Amortization Expense Related to Amortizing Intangible Assets (Detail) - USD ($)
$ in Thousands
Apr. 30, 2016
Apr. 30, 2015
Finite-Lived Intangible Assets [Line Items]    
2017 $ 15,437  
2018 14,742  
2019 13,487  
2020 13,204  
2021 13,280  
Thereafter 56,494  
Amortized intangible assets, Net $ 126,644 $ 44,128