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Other Income (Expense), Net (Tables)
 6 Months Ended
Jul. 31, 2019
Other Income and Expenses [Abstract]  
Other Income (Expense), Net
Other income (expense), net consisted of the following (in thousands):
 
Three Months Ended July 31,
 
Six Months Ended July 31,
 
2019
 
2018
 
2019
 
2018
Interest income
$
11,239

 
$
14,692

 
$
21,589

 
$
26,928

Interest expense (1)
(14,473
)
 
(17,515
)
 
(26,074
)
 
(35,817
)
Other (2)
3,128

 
4,436

 
11,520

 
6,654

Other income (expense), net
$
(106
)
 
$
1,613

 
$
7,035

 
$
(2,235
)
(1) 
Interest expense includes the contractual interest expense related to the 2018 Notes, 2020 Notes, and 2022 Notes and non-cash interest expense related to amortization of the debt discount and debt issuance costs, net of capitalized interest costs. For further information, see Note 10, Convertible Senior Notes, Net.
(2) 
Other includes the net gains (losses) from our equity investments. For further information, see Note 3, Investments.