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Goodwill and Acquired Intangible Assets - Current and Expected Amortization Expense for Acquired Intangible Assets (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Mar. 31, 2018
Goodwill And Intangible Assets Disclosure [Abstract]          
For the six months ended September 30, 2018 $ 2,435 $ 3,320 $ 4,888 $ 6,580  
Expected for the remainder of fiscal year 2019 4,602   4,602    
Expected for fiscal year 2020 7,556   7,556    
Expected for fiscal year 2021 5,158   5,158    
Expected for fiscal year 2022 3,335   3,335    
Expected for fiscal year 2023 3,030   3,030    
Thereafter 2,391   2,391    
Other acquired intangible assets, net $ 26,072   $ 26,072   $ 31,862