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Other Income (Expense), Net (Tables) | 3 Months Ended
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Apr. 30, 2018
Other Income and Expenses [Abstract] |
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).

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- Definition Tabular disclosure of the components of non-operating income or non-operating expense that may include amounts earned from dividends, interest on securities, gains (losses) on securities sold, equity earnings of unconsolidated affiliates, net gain (loss) on sales of business, interest expense and other miscellaneous income or expense items. + References No definition available. + Details
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