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Other Income (Expense), Net
 3 Months Ended
Apr. 30, 2018
Other Income and Expenses [Abstract]  
Other Income (Expense), Net
Other Income (Expense), Net
Other income (expense), net consisted of the following (in thousands):
 
Three Months Ended April 30,
 
2018
 
2017
Interest income
$
12,236

 
$
4,029

Interest expense (1)
(18,302
)
 
(6,986
)
Other income (expense)
2,218

 
1,294

Other income (expense), net
$
(3,848
)
 
$
(1,663
)
(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 10).