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Other Income (Expense), Net (Tables)
 9 Months Ended
Oct. 31, 2018
Other Income and Expenses [Abstract]  
Other Income (Expense), Net
Other income (expense), net consisted of the following (in thousands):
 
Three Months Ended October 31,
 
Nine Months Ended October 31,
 
2018
 
2017
 
2018
 
2017
Interest income
$
6,995

 
$
6,394

 
$
33,923

 
$
15,474

Interest expense (1)
(12,348
)
 
(12,285
)
 
(48,165
)
 
(26,111
)
Other (2)
31,970

 
2,149

 
38,624

 
6,170

Other income (expense), net
$
26,617

 
$
(3,742
)
 
$
24,382

 
$
(4,467
)
(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 (see Note 11).
(2) 
Other includes the net gains (losses) from our equity investments (see Note 3).