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Acquisition-related Intangible Assets, Net - Schedule of Future Amortization Expense (Detail) - USD ($)
$ in Thousands
Jul. 31, 2019
Jan. 31, 2019
Finite-Lived Intangible Assets [Line Items]    
Total $ 277,953 $ 313,240
Acquired Intangible Assets    
Finite-Lived Intangible Assets [Line Items]    
Remainder of 2020 31,369  
2021 50,342  
2022 43,733  
2023 41,009  
2024 29,833  
Thereafter 81,667  
Total $ 277,953