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Acquisition-related Intangible Assets, Net (Schedule of Future Amortization Expense) (Detail) - USD ($)
$ in Thousands
Jan. 31, 2019
Jan. 31, 2018
Finite-Lived Intangible Assets, Net, Amortization Expense, Rolling Maturity [Abstract]    
Total $ 313,240 $ 34,234
Acquired developed technology and customer relationship assets    
Finite-Lived Intangible Assets, Net, Amortization Expense, Rolling Maturity [Abstract]    
2020 68,856  
2021 48,142  
2022 43,733  
2023 41,009  
2024 29,833  
Thereafter 81,667  
Total $ 313,240