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Goodwill and Acquired Intangible Assets - Expected Amortization Expense for Acquired Intangible Assets (Detail) - USD ($)
$ in Thousands
Mar. 31, 2019
Mar. 31, 2018
Goodwill And Intangible Assets Disclosure [Abstract]    
Expected for fiscal year 2020 $ 7,485  
Expected for fiscal year 2021 5,101  
Expected for fiscal year 2022 3,278  
Expected for fiscal year 2023 2,973  
Expected for fiscal year 2024 2,458  
Thereafter 1,006  
Other acquired intangible assets, net $ 22,301 $ 31,862