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Other Income (Expense), Net | 3 Months Ended
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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).

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- Definition The entire disclosure for other income or other expense items (both operating and nonoperating). Sources of nonoperating income or nonoperating expense that may be disclosed, include amounts earned from dividends, interest on securities, profits (losses) on securities, net and miscellaneous other income or income deductions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 720 -URI http://asc.fasb.org/topic&trid=2122503 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 610 -URI http://asc.fasb.org/topic&trid=49130413 + Details
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