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Intangible Assets - Schedule of Future Expected Amortization Expense (Detail) - USD ($)
$ in Thousands
Jan. 31, 2016
Apr. 30, 2015
Finite-Lived Intangible Assets [Line Items]    
Finite lived intangible assets, Net Carrying Amount $ 64,647 $ 73,320
Accessories    
Finite-Lived Intangible Assets [Line Items]    
2016 2,819  
2017 10,501  
2018 9,755  
2019 8,568  
2020 7,420  
Thereafter 25,584  
Finite lived intangible assets, Net Carrying Amount $ 64,647