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Acquisition-related Intangible Assets, Net - Schedule of Future Amortization Expense (Detail) - USD ($)
$ in Thousands
Apr. 30, 2018
Jan. 31, 2018
Finite-Lived Intangible Assets, Net, Amortization Expense, Rolling Maturity [Abstract]    
Total $ 10,790 $ 11,217
Acquired developed technology and customer relationship assets    
Finite-Lived Intangible Assets, Net, Amortization Expense, Rolling Maturity [Abstract]    
2019 14,998  
2020 11,481  
2021 1,517  
2022 1,150  
Total $ 29,146