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Acquisition-related Intangible Assets, Net - Schedule of Future Amortization Expense (Detail) - USD ($)
$ in Thousands
Apr. 30, 2019
Jan. 31, 2019
Finite-Lived Intangible Assets [Line Items]    
Total $ 293,897 $ 313,240
Acquired Intangible Assets    
Finite-Lived Intangible Assets [Line Items]    
Remainder of 2020 49,513  
2021 48,142  
2022 43,733  
2023 41,009  
2024 29,833  
Thereafter 81,667  
Total $ 293,897