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Acquisition-related Intangible Assets, Net - Schedule of Future Amortization Expense (Detail) - USD ($)
$ in Thousands
Oct. 31, 2018
Jan. 31, 2018
Finite-Lived Intangible Assets [Line Items]    
Total $ 10,980 $ 11,217
Acquired Intangible Assets    
Finite-Lived Intangible Assets [Line Items]    
2019 19,343  
2020 68,856  
2021 48,142  
2022 43,733  
2023 41,009  
Thereafter 111,500  
Total $ 332,583