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Derivative Instruments - Gains and Losses (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Oct. 31, 2020
Oct. 31, 2019
Oct. 31, 2020
Oct. 31, 2019
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Change in unrealized gain (loss) on cash flow hedges $ (203) $ 608 $ (973) $ (83)
Foreign currency forward | 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 (214) 124 (1,331) 80
Cash flow hedging | Foreign currency forward        
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Change in unrealized gain (loss) on cash flow hedges 16 374 (660) (237)
Cash flow hedging | Foreign currency forward | Revenues        
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Gains reclassified from OCI into income (effective portion) 166 131 459 350
Cash flow hedging | Foreign currency forward | General and administrative expense        
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Gains reclassified from OCI into income (effective portion) 53 (365) (146) (504)
Cash flow hedging | Foreign currency forward | Interest income and other income (expense), net        
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Losses recognized in income (amount excluded from effectiveness testing and ineffective portion) $ (15) $ (42) $ (73) $ (105)