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Derivative Instruments - Gains and Losses (Details) - Foreign currency forward - USD ($)
$ in Thousands
3 Months Ended
Apr. 30, 2020
Apr. 30, 2019
Interest income and other income (expense), net    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Gains (losses) associated with foreign currency forward contracts not designated as cash flow hedges $ 666 $ (59)
Cash flow hedging    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Gains (losses) recognized in OCI (effective portion) 72 (143)
Cash flow hedging | Revenues    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Gains (losses) reclassified from OCI into income (effective portion) 130 104
Cash flow hedging | General and administrative expense    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Gains (losses) reclassified from OCI into income (effective portion) 164 6
Cash flow hedging | Interest income and other income (expense), net    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Gains (losses) recognized in income (amount excluded from effectiveness testing and ineffective portion) $ (49) $ (33)