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Intangible Assets - Estimated Future Amortization Expense (Detail) - USD ($)
$ in Thousands
Sep. 30, 2016
Mar. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]    
2017 $ 4,731  
2018 2,156  
2019 974  
2020 121  
2021 57  
Thereafter 690  
Net $ 8,729 $ 12,490