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Intangible Assets - Schedule of Future Expected Amortization Expense (Detail) - USD ($)
$ in Thousands
Jul. 31, 2015
Apr. 30, 2015
Finite-Lived Intangible Assets [Line Items]    
Finite lived intangible assets, Net Carrying Amount $ 69,995 $ 73,320
Accessories    
Finite-Lived Intangible Assets [Line Items]    
2016 8,446  
2017 10,480  
2018 9,735  
2019 8,547  
2020 7,399  
Thereafter 25,388  
Finite lived intangible assets, Net Carrying Amount $ 69,995