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Acquired Intangible Asset Net - Estimate of Future Amortization Expense for Definite-Lived Intangible Assets (Detail) - USD ($)
$ in Thousands
Apr. 30, 2015
Apr. 30, 2014
Goodwill and Intangible Assets Disclosure [Abstract]    
Fiscal year 2016 $ 1,890  
Fiscal year 2017 1,890  
Fiscal year 2018 1,890  
Fiscal year 2019 1,856  
Fiscal year 2020 1,130  
Thereafter 2,842  
Total $ 11,498 $ 13,388