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Derivative Instruments - Gains (Losses) Associated with Foreign Currency Forward Contracts (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Oct. 31, 2021
Oct. 31, 2020
Oct. 31, 2021
Oct. 31, 2020
Derivative Instruments, Gain (Loss) [Line Items]        
Gains (losses) recognized in OCI $ 21,542 $ 8,612 $ 33,320 $ (7,153)
Revenues        
Derivative Instruments, Gain (Loss) [Line Items]        
Gains (losses) reclassified from AOCI into income (effective portion) (3,847) 5,568 (4,996) 15,332
Other income (expense), net        
Derivative Instruments, Gain (Loss) [Line Items]        
Foreign currency forward contracts not designated as hedges $ 605 $ 151 $ 2,424 $ 1,524