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Goodwill and Acquired Intangible Assets - Expected Amortization Expense for Acquired Intangible Assets (Detail) - USD ($)
$ in Thousands
Mar. 31, 2018
Mar. 31, 2017
Goodwill And Intangible Assets Disclosure [Abstract]    
Expected for fiscal year 2019 $ 9,571  
Expected for fiscal year 2020 7,726  
Expected for fiscal year 2021 5,277  
Expected for fiscal year 2022 3,451  
Expected for fiscal year 2023 3,146  
Thereafter 2,691  
Other acquired intangible assets, net $ 31,862 $ 41,677