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Other Income (Expense), Net (Notes)
 3 Months Ended
Apr. 30, 2019
Other Income and Expenses [Abstract]  
Other Income (Expense), Net
Other Income (Expense), Net

Other income (expense), net consists of the following (in thousands):
 
Three Months Ended April 30,
 
2018
 
2019
Interest income (1)
$
1,871

 
$
6,834

Interest expense (2)
(1,498
)
 
(6,667
)
Foreign currency transactions gains (losses)
(2,134
)
 
(1,981
)
Other income (expense)
762

 
(2
)
Total other income (expense), net
$
(999
)
 
$
(1,816
)
____________________________________

(1) Interest income includes interest income related to our cash, cash equivalents and marketable securities and non-cash interest income related to accretion (amortization) of the discount (premium) on marketable securities.

(2) Interest expense includes non-cash interest expense related to amortization of the debt discount and debt issuance costs and the contractual interest expense related to the Notes for the three months ended April 30, 2018 and 2019.