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Intangible Assets - Schedule of Future Expected Amortization Expense (Detail) - USD ($)
$ in Thousands
Apr. 30, 2018
Apr. 30, 2017
Finite-Lived Intangible Assets [Line Items]    
Total definite-lived intangible assets, Net Carrying Amount $ 112,534 $ 141,091
Outdoor Products & Accessories Segment    
Finite-Lived Intangible Assets [Line Items]    
2019 21,971  
2020 19,095  
2021 16,488  
2022 14,109  
2023 11,747  
Thereafter 28,269  
Total definite-lived intangible assets, Net Carrying Amount $ 111,679