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Goodwill and Acquired Intangible Assets - Expected Amortization Expense for Acquired Intangible Assets (Detail) - USD ($)
$ in Thousands
Mar. 31, 2017
Mar. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]    
Expected for fiscal year 2018 $ 11,733  
Expected for fiscal year 2019 9,076  
Expected for fiscal year 2020 7,312  
Expected for fiscal year 2021 4,993  
Expected for fiscal year 2022 3,171  
Thereafter 5,392  
Other acquired intangible assets, net $ 41,677 $ 33,604