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Goodwill and Intangible Assets, Net - Future Amortization (Details) - USD ($)
$ in Thousands
Apr. 30, 2019
Jan. 31, 2019
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]    
Fiscal 2020, remainder $ 12,984  
Fiscal 2021 13,818  
Fiscal 2022 8,370  
Fiscal 2023 6,023  
Fiscal 2024 6,023  
Thereafter 21,632  
Acquisition-related intangibles, net, excluding cumulative translation adjustment $ 68,850 $ 73,583