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Intangible Assets - Schedule of Future Expected Amortization Expense (Detail) - USD ($)
$ in Thousands
Apr. 30, 2017
Apr. 30, 2016
Finite-Lived Intangible Assets [Line Items]    
Total definite-lived intangible assets, Net Carrying Amount $ 141,091 $ 62,924
Outdoor Products & Accessories Segment    
Finite-Lived Intangible Assets [Line Items]    
2018 22,937  
2019 23,199  
2020 20,367  
2021 17,552  
2022 14,836  
Thereafter 41,589  
Total definite-lived intangible assets, Net Carrying Amount $ 140,480