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Derivative Instruments - Gains (Losses) Associated with Foreign Currency Forward Contracts (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jul. 31, 2021
Jul. 31, 2020
Jul. 31, 2021
Jul. 31, 2020
Derivative Instruments, Gain (Loss) [Line Items]        
Gains (losses) recognized in OCI $ 16,031 $ (52,558) $ 11,778 $ (15,765)
Revenues        
Derivative Instruments, Gain (Loss) [Line Items]        
Gains (losses) reclassified from AOCI into income (effective portion) (1,667) 5,278 (1,149) 9,764
Other income (expense), net        
Derivative Instruments, Gain (Loss) [Line Items]        
Foreign currency forward contracts not designated as hedges $ 2,011 $ (4,040) $ 1,819 $ 1,373