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Other Income (Expense), Net (Notes)
 12 Months Ended
Jan. 31, 2019
Other Income and Expenses [Abstract]  
Other Income (Expense), Net
Other Income (Expense), Net
Other income (expense), net consists of the following (in thousands):
 
Year Ended January 31,
 
2017
 
2018
 
2019
Interest income (1)
$
4,052

 
$
5,424

 
$
18,013

Interest expense (2)
(44
)
 
(19
)
 
(21,615
)
Foreign currency transaction gains (losses)
(2,632
)
 
5,976

 
(5,230
)
Other income
251

 
64

 
816

Total other income (expense), net
$
1,627

 
$
11,445

 
$
(8,016
)
_________________________________
(1) Interest income includes the 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 year ended January 31, 2019.